From e2b640762d366da7cf67ac415517a07e45ac56b2 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Thu, 17 Aug 2023 15:48:22 +0200
Subject: [PATCH 01/80] Start new attempt on Quint model of ICS

---
 .../core/quint_model/extraSpells.qnt          |  62 ++++++++
 tests/difference/core/quint_model/staking.qnt | 138 ++++++++++++++++++
 2 files changed, 200 insertions(+)
 create mode 100644 tests/difference/core/quint_model/extraSpells.qnt
 create mode 100644 tests/difference/core/quint_model/staking.qnt

diff --git a/tests/difference/core/quint_model/extraSpells.qnt b/tests/difference/core/quint_model/extraSpells.qnt
new file mode 100644
index 0000000000..bdc6fd0bf2
--- /dev/null
+++ b/tests/difference/core/quint_model/extraSpells.qnt
@@ -0,0 +1,62 @@
+module extraSpells {
+
+    /// Removes a set of map entry.
+    ///
+    /// - @param __map a map to remove an entry from
+    /// - @param __keys a set of keys to remove from the map
+    /// - @returns a new map that contains all entries of __map
+    ///          that do not have a key in __keys
+    pure def mapRemoveAll(__map: a -> b, __keys: Set[a]): a -> b = {
+        __map.keys().exclude(__keys).mapBy(__k => __map.get(__k))
+    }
+
+    run mapRemoveAllTest =
+        val m = Map(3 -> 4, 5 -> 6, 7 -> 8)
+        all {
+            assert(m.mapRemoveAll(Set(5, 7)) == Map(3 -> 4)),
+            assert(m.mapRemoveAll(Set(5, 99999)) == Map(3 -> 4, 7 -> 8)),
+        }
+        
+    pure def listSorted(__list: List[a], __lt: (a, a) => bool): List[a] = {
+    pure def __countSmaller(__j: int): int = {
+      pure val __jth = __list[__j]
+      __list.indices().filter(__i =>
+        __lt(__list[__i], __jth) or (__list[__i] == __jth and __i < __j)
+      )
+      .size()
+    }
+
+    pure val __permutation = __list.indices().mapBy(__i => __countSmaller(__i))
+        __list.foldl([], (__l, __i) => __l.append(__list[__permutation.get(__i)]))
+    }
+
+    //// Returns a list of all elements of a set.
+    ////
+    //// - @param __set a set
+    //// - @returns a list of all elements of __set
+    pure def toList(__set: Set[a]): List[a] = {
+        __set.fold(List(), (__l, __e) => __l.append(__e))
+    }
+
+    //// Returns a set of the elements in the list.
+    ////
+    //// - @param __list a list
+    //// - @returns a set of the elements in __list
+    pure def toSet(__list: List[a]): Set[a] = {
+        __list.foldl(Set(), (__s, __e) => __s.union(Set(__e)))
+    }
+
+    run toListAndSetTest =
+    all {
+        assert(Set(3, 2, 1).toList().toSet() == Set(1, 2, 3)),
+        assert(List(2,3,1).toSet() == Set(1, 2, 3)),
+        assert(List(2,3,1).toSet() == List(3,2,1).toSet()),
+        assert(toList(Set()) == List()),
+        assert(toSet(List()) == Set())
+    }
+
+    pure def add(__set: Set[a], elem: a): Set[a] = {
+        __set.union(Set(elem))
+    }
+
+}
\ No newline at end of file
diff --git a/tests/difference/core/quint_model/staking.qnt b/tests/difference/core/quint_model/staking.qnt
new file mode 100644
index 0000000000..bcb944cd41
--- /dev/null
+++ b/tests/difference/core/quint_model/staking.qnt
@@ -0,0 +1,138 @@
+module ccv {
+    import extraSpells.* from "./extraSpells"
+
+    // Things that are not modelled:
+    // * Reward distribution
+    
+    // TYPE DEFINITIONS
+    type Chain = str
+    type Validator = {
+        identifier: str,
+        // for simplciity, voting power is equal to amount of tokens
+        votingPower: int
+    }
+    type Height = int
+    type Timestamp = int
+
+    type Infraction = 
+        {
+            validator: Validator,
+            infractionType: str,
+            // slash fraction in percent, i.e. 80 means 80%
+            slashFraction: int,
+            // the height at which the infraction was committed
+            infractionHeight: Height,
+            // the timestamp at which the infraction was committed
+            infractionTime: Timestamp,
+            // the chain on which the infraction was committed
+            originChain: Chain,
+        }
+
+    type Block = 
+        {
+            validatorSet: Set[Validator],
+            blockHeight: Height,
+            blockTime: Timestamp,
+            chain: Chain,
+            // Infrations comitted on this chain in this block.
+            comittedInfractions: Set[Infraction],
+            // Evidence received by this chain in this block.
+            receivedEvidence: Set[Infraction] // only used on the provider
+        }
+
+    type Slash = 
+        {
+            validator: Validator,
+            slashAmount: int,
+            slashHeight: Height,
+            slashTime: Timestamp,
+            chain: Chain,
+            infraction: Infraction
+        }
+
+
+    // MODEL PARAMETERS
+    const UnbondingPeriod: int
+
+    // MODEL STATE
+
+    // The singular provider chain.
+    var providerChain: Chain
+
+    // The set of (possible) consumer chains that are being tracked.
+    var chains: Set[Chain]
+
+    // Stores, for each chain, the list of blocks over its entire existence.
+    // Each height should occur at most once, and no height should be skipped.
+    // Blocks should be ordered by height in descending order.
+    var blockHistories: Chain -> List[Block]
+    
+    // Stores, for each chain, whether it is currently a consumer chain.
+    var consumerStatus: Chain -> bool
+
+    var slashes: Set[Slash]
+
+    // UTILITY FUNCTIONS
+    def getCurrentHeight(chain: Chain): Height = {
+        blockHistories.get(chain).head().blockHeight
+    }
+
+    def getLatestBlock(chain: Chain): Block = {
+        blockHistories.get(chain).head()
+    }
+
+    def isConsumer(chain: Chain): bool = {
+        consumerStatus.get(chain)
+    }
+
+    def wasValidatorSetOnProvider(validatorSet: Set[Validator]): bool = {
+        blockHistories.get(providerChain).toSet().exists(
+            block => block.validatorSet == validatorSet
+        )
+    }
+
+    // PROPERTIES
+
+    // Every validator set on any consumer chain MUST either be or
+    // have been a validator set on the provider chain.
+    val ValidatorSetReplication: bool = 
+        chains.filter(chain => chain.isConsumer()).forall(
+            chain => chain.getLatestBlock().validatorSet.wasValidatorSetOnProvider()
+        )
+
+    // TODO: This is extremely convoluted, maybe coming later?
+    val BondBasedConsumerVotingPower: bool =
+        true
+
+    // If a validator val commits an infraction, with a slashing fraction of sf,
+    // on a consumer chain cc at a block height hi,
+    // then any evidence of misbehavior that is received by cc at height he,
+    // such that ts(he) < ts(hi) + UnbondingPeriod, MUST results in exactly the amount of tokens
+    // sf*Token(Power(cc,hi,val)) to be slashed on the provider chain.
+    // Furthermore, val MUST NOT be slashed more than once for the same misbehavior.
+    val SlashableConsumerMisbehaviour: bool =
+        val latestProviderBlock = providerChain.getLatestBlock()
+        latestProviderBlock.receivedEvidence.forall(
+            // for each evidence the provider chain received
+            evidence => 
+                // if the evidence is received before it is outdated
+                (evidence.infractionTime < latestProviderBlock.blockTime - UnbondingPeriod)
+                    implies
+                // the provider needs to slash the validator
+                val expectedSlash =
+                    {
+                        validator: evidence.validator,
+                        // the amount depends on the voting power during the infraction
+                        slashAmount: evidence.validator.votingPower * evidence.slashFraction,
+                        slashHeight: latestProviderBlock.blockHeight,
+                        slashTime: latestProviderBlock.blockTime,
+                        chain: providerChain,
+                        infraction: evidence
+                    }
+                slashes.exists(slash => slash == expectedSlash)
+        )
+
+        val ValidatorUpdateInclusion: bool =
+            true
+
+}
\ No newline at end of file

From 283dc0a01ac950c39a06b8f5e797f0ed6bf92ec3 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Wed, 23 Aug 2023 18:04:29 +0200
Subject: [PATCH 02/80] Advance quint model

---
 .../core/quint_model/extraSpells.qnt          | 129 +++++++
 tests/difference/core/quint_model/model.qnt   | 327 ++++++++++++++++++
 tests/difference/core/quint_model/staking.qnt | 138 --------
 3 files changed, 456 insertions(+), 138 deletions(-)
 create mode 100644 tests/difference/core/quint_model/model.qnt
 delete mode 100644 tests/difference/core/quint_model/staking.qnt

diff --git a/tests/difference/core/quint_model/extraSpells.qnt b/tests/difference/core/quint_model/extraSpells.qnt
index bdc6fd0bf2..a32a74ad8f 100644
--- a/tests/difference/core/quint_model/extraSpells.qnt
+++ b/tests/difference/core/quint_model/extraSpells.qnt
@@ -1,5 +1,134 @@
 module extraSpells {
 
+  pure def prepend(__list: List[a], __elem: a): List[a] = {
+    List(__elem).concat(__list)
+  }
+
+  run prependTest = all {
+    assert(List(2,3,4).prepend(1) == List(1,2,3,4)),
+    assert(List().prepend(1) == List(1)),
+  }
+
+    /// An annotation for writing preconditions.
+  /// - @param __cond condition to check
+  /// - @returns true if and only if __cond evaluates to true
+  pure def require(__cond: bool): bool = __cond
+
+  run requireTest = all {
+    assert(require(4 > 3)),
+    assert(not(require(false))),
+  }
+
+  /// A convenience operator that returns a string error code,
+  ///  if the condition does not hold true.
+  ///
+  /// - @param __cond condition to check
+  /// - @param __error a non-empty error message
+  /// - @returns "", when __cond holds true; otherwise __error
+  pure def requires(__cond: bool, __error: str): str = {
+    if (__cond) "" else __error
+  }
+
+  run requiresTest = all {
+    assert(requires(4 > 3, "4 > 3") == ""),
+    assert(requires(4 < 3, "false: 4 < 3") == "false: 4 < 3"),
+  }
+
+
+  /// Compute the maximum of two integers.
+  ///
+  /// - @param __i first integer
+  /// - @param __j second integer
+  /// - @returns the maximum of __i and __j
+  pure def max(__i: int, __j: int): int = {
+    if (__i > __j) __i else __j
+  }
+
+  run maxTest = all {
+    assert(max(3, 4) == 4),
+    assert(max(6, 3) == 6),
+    assert(max(10, 10) == 10),
+    assert(max(-3, -5) == -3),
+    assert(max(-5, -3) == -3),
+  }
+
+  /// Compute the absolute value of an integer
+  ///
+  /// - @param __i : an integer whose absolute value we are interested in
+  /// - @returns |__i|, the absolute value of __i
+  pure def abs(__i: int): int = {
+    if (__i < 0) -__i else __i
+  }
+
+  run absTest = all {
+    assert(abs(3) == 3),
+    assert(abs(-3) == 3),
+    assert(abs(0) == 0),
+  }
+
+  /// Remove a set element.
+  ///
+  /// - @param __set a set to remove an element from
+  /// - @param __elem an element to remove
+  /// - @returns a new set that contains all elements of __set but __elem
+  pure def setRemove(__set: Set[a], __elem: a): Set[a] = {
+    __set.exclude(Set(__elem))
+  }
+
+  run setRemoveTest = all {
+    assert(Set(2, 4) == Set(2, 3, 4).setRemove(3)),
+    assert(Set() == Set().setRemove(3)),
+  }
+
+  /// Test whether a key is present in a map
+  ///
+  /// - @param __map a map to query
+  /// - @param __key the key to look for
+  /// - @returns true if and only __map has an entry associated with __key
+  pure def has(__map: a -> b, __key: a): bool = {
+    __map.keys().contains(__key)
+  }
+
+  run hasTest = all {
+    assert(Map(2 -> 3, 4 -> 5).has(2)),
+    assert(not(Map(2 -> 3, 4 -> 5).has(6))),
+  }
+
+  /// Get the map value associated with a key, or the default,
+  /// if the key is not present.
+  ///
+  /// - @param __map the map to query
+  /// - @param __key the key to search for
+  /// - @returns the value associated with the key, if __key is
+  ///   present in the map, and __default otherwise
+  pure def getOrElse(__map: a -> b, __key: a, __default: b): b = {
+    if (__map.has(__key)) {
+      __map.get(__key)
+    } else {
+      __default
+    }
+  }
+
+  run getOrElseTest = all {
+    assert(Map(2 -> 3, 4 -> 5).getOrElse(2, 0) == 3),
+    assert(Map(2 -> 3, 4 -> 5).getOrElse(7, 11) == 11),
+  }
+
+  /// Remove a map entry.
+  ///
+  /// - @param __map a map to remove an entry from
+  /// - @param __key the key of an entry to remove
+  /// - @returns a new map that contains all entries of __map
+  ///          that do not have the key __key
+  pure def mapRemove(__map: a -> b, __key: a): a -> b = {
+    __map.keys().setRemove(__key).mapBy(__k => __map.get(__k))
+  }
+
+  run mapRemoveTest = all {
+    assert(Map(3 -> 4, 7 -> 8) == Map(3 -> 4, 5 -> 6, 7 -> 8).mapRemove(5)),
+    assert(Map() == Map().mapRemove(3)),
+  }
+
     /// Removes a set of map entry.
     ///
     /// - @param __map a map to remove an entry from
diff --git a/tests/difference/core/quint_model/model.qnt b/tests/difference/core/quint_model/model.qnt
new file mode 100644
index 0000000000..6c78f6fb64
--- /dev/null
+++ b/tests/difference/core/quint_model/model.qnt
@@ -0,0 +1,327 @@
+module ccv {
+    import extraSpells.* from "./extraSpells"
+
+    // Things that are not modelled:
+    // * Reward distribution
+    // * Starting/Stopping chains during execution
+    // * Slashes
+    
+    // TYPE DEFINITIONS
+    type Node = str
+    type Chain = str
+    type ValidatorSet = Node -> int
+    type Height = int
+    type Timestamp = int
+
+    // --PACKETS
+    type VSCPacket =
+        {   
+            // the identifier for this packet
+            id: int,
+            // the new validator set. in the implementation, this would be a list of validator updates
+            validatorSet: ValidatorSet
+        }
+
+    type VSCMaturedPacket = 
+        {
+            // the id of the VSCPacket that matured
+            id: int
+        }
+    
+    // MODEL PARAMETERS
+    // length of the unbonding period on each chain
+    const UnbondingPeriod: Chain -> int
+
+    // set of identifiers of potential nodes
+    const Nodes: Set[Node]
+
+    // the set of consumer chains
+    const ConsumerChains: Set[Chain]
+
+    // The singular provider chain.
+    const ProviderChain: Chain
+
+    pure val chains = ConsumerChains.union(Set(ProviderChain))
+
+    // the time until a packet times out
+    const PacketTimeout: int
+
+    // the time until a consumer chain is dropped by the provider due to inactivity
+    const InactivityTimeout: int
+
+
+    // MODEL STATE
+    // --SHARED STATE
+
+    // Stores, for each chain, the list of voting powers that corresponded to voting powers 
+    // at blocks over its entire existence.
+    // Voting powers should be ordered by recency in descending order.
+    var votingPowerHistories: Chain -> List[ValidatorSet]
+
+    // the current validator set on each chain.
+    // this will be included in the next block, but might not be final yet,
+    // e.g. there may be more modifications in the current block.
+    var runningValidatorSet: Chain -> ValidatorSet
+
+    // the current timestamp for each chain
+    var curChainTimes: Chain -> Timestamp
+
+    // stores, for each chain, its current status -
+    // unused, running, or stopped
+    var consumerStatus: Chain -> str
+
+    // --CHANNELS
+    // Stores, for each consumer chain, the list of packets that have been sent to the provider chain
+    // and have not been received yet.
+    var outstandingPacketsToProvider: Chain -> List[VSCMaturedPacket]
+
+    // Stores, for each consumer chain, the list of packets that have been sent to the consumer chain
+    // and have not been received yet.
+    var outstandingPacketsToConsumer: Chain -> List[VSCPacket]
+
+
+    // --CONSUMER STATE
+    // Stores the maturation times for VSCPackets received by consumers
+    var maturationTimes: Chain -> (VSCPacket -> Timestamp)
+
+    // --PROVIDER STATE
+    // the set of VSCMaturedPackets received by the provider chain
+    var receivedMaturations: Set[VSCMaturedPacket]
+
+
+    // UTILITY FUNCTIONS & ACTIONS
+    def wasValidatorSetOnProvider(validatorSet: ValidatorSet): bool = {
+        votingPowerHistories.get(ProviderChain).toSet().exists(
+            historicalValSet => historicalValSet == validatorSet
+        )
+    }
+
+    def getCurrentValidatorSet(chain: Chain): ValidatorSet = 
+        votingPowerHistories.get(chain).head()
+
+    def getUpdatedValidatorSet(oldValidatorSet: ValidatorSet, validator: Node, newVotingPower: int): ValidatorSet =
+        if (newVotingPower > 0) 
+        oldValidatorSet.set(validator, newVotingPower)
+        else
+        oldValidatorSet.mapRemove(validator)
+
+    // utility action that leaves all provider state untouched
+    action PROVIDER_NOOP(): bool = 
+        all {
+            receivedMaturations' = receivedMaturations,
+        }
+
+    // utility action that leaves all consumer state untouched
+    action CONSUMER_NOOP(): bool = 
+        all {
+            maturationTimes' = maturationTimes,
+        }
+    
+
+    // MODEL ACTIONS
+
+    // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
+    // e.g. via undelegations, or delegations, ...
+    action votingPowerChange(validator: Node, amount: int): bool =
+        // for the provider chain, we need to adjust the voting power history
+        // by adding a new set
+        all {
+            amount >= 0,
+            val newValidatorSet = getCurrentValidatorSet(ProviderChain).getUpdatedValidatorSet(validator, amount)
+            // set the running validator set on the provider chain, but don't update the history yet
+            runningValidatorSet' = runningValidatorSet.set(ProviderChain, newValidatorSet),
+            // no packets are sent yet, these are only sent on endAndBeginBlock
+            outstandingPacketsToConsumer' = outstandingPacketsToConsumer,
+            outstandingPacketsToProvider' = outstandingPacketsToProvider,
+            receivedMaturations' = receivedMaturations,
+            CONSUMER_NOOP,
+            // voting power history is only updated on endAndBeginBlock
+            votingPowerHistories' = votingPowerHistories,
+        }
+
+    // deliver the next outstanding packet from the consumer to the provider.
+    // since this model assumes a single provider chain, this just takes a single chain as argument.
+    action recvPacketOnProvider(consumer: Chain): bool = all {
+        // ensure there is a packet to be received
+        outstandingPacketsToProvider.get(consumer).length() > 0,
+        // remove packet from outstanding packets
+        val newPacketQueue = outstandingPacketsToProvider.get(consumer).tail()
+        outstandingPacketsToProvider' = outstandingPacketsToProvider.set(consumer, newPacketQueue),
+        // register the packet as received
+        val maturedPacket = outstandingPacketsToProvider.get(consumer).head()
+        receivedMaturations' = receivedMaturations.add(maturedPacket),
+        CONSUMER_NOOP,
+        outstandingPacketsToConsumer' = outstandingPacketsToConsumer,
+        votingPowerHistories' = votingPowerHistories,
+        // no validator set changes are made
+        runningValidatorSet' = runningValidatorSet,
+    }
+
+    // deliver the next outstanding packet from the provider to the consumer.
+    // since this model assumes a single provider chain, this just takes a single chain as argument.
+    action recvPacketOnConsumer(consumer: Chain): bool = all {
+        // ensure there is a packet to be received
+        outstandingPacketsToConsumer.get(consumer).length() > 0,
+        // remove packet from outstanding packets
+        val newPacketQueue = outstandingPacketsToConsumer.get(consumer).tail()
+        outstandingPacketsToConsumer' = outstandingPacketsToConsumer.set(consumer, newPacketQueue),
+        val packet = outstandingPacketsToConsumer.get(consumer).head()
+        all {
+            // update the running validator set, but not the history yet,
+            // as that only happens when the next block is started
+            runningValidatorSet' = runningValidatorSet.set(consumer, packet.validatorSet),
+            // add the new packet and store its maturation time
+            val newMaturationTimes = maturationTimes.get(consumer).set(packet, curChainTimes.get(consumer) + UnbondingPeriod.get(consumer))
+            maturationTimes' = maturationTimes.set(consumer, newMaturationTimes)
+        },
+        PROVIDER_NOOP,
+        votingPowerHistories' = votingPowerHistories,
+        outstandingPacketsToProvider' = outstandingPacketsToProvider,
+    }
+
+    // ends the current block and starts the next block for a given chain.
+    action endAndBeginBlock(chain: Chain): bool = any {
+        all {
+          chain == ProviderChain,
+          endAndBeginBlockForProvider,
+        },
+        all {
+            chain != ProviderChain,
+            endAndBeginBlockForConsumer(chain),
+        }
+    }
+
+    // gets the updated history for the current chain when ending a block, i.e. the
+    // running validator set is added to the history if different from the last one.
+    def getUpdatedHistory(chain: Chain): List[ValidatorSet] =
+        // update voting power history if the validator set changed
+        val newValidatorSet = runningValidatorSet.get(ProviderChain)
+        val oldValidatorSet = votingPowerHistories.get(ProviderChain).head()
+        if (newValidatorSet != oldValidatorSet) 
+            votingPowerHistories.get(ProviderChain).prepend(newValidatorSet)
+        else
+            votingPowerHistories.get(ProviderChain)
+
+
+    action endAndBeginBlockForProvider(): bool = all {
+        // update the voting power history
+        votingPowerHistories' = votingPowerHistories.set(ProviderChain, getUpdatedHistory(ProviderChain)),
+        // the running validator set is now for sure the current validator set,
+        // so start with it in the next block
+        runningValidatorSet' = runningValidatorSet,
+        // send VSCPackets to consumers
+        outstandingPacketsToConsumer' = 
+            // if running validator set is not equal to the last one in the history
+            if (runningValidatorSet.get(ProviderChain) != votingPowerHistories.get(ProviderChain).head())
+                // then send a packet to each consumer
+                outstandingPacketsToConsumer.keys().mapBy(
+                    (consumer) => 
+                    val packetQueue = outstandingPacketsToConsumer.get(consumer)
+                    packetQueue.append(
+                        {
+                            id: packetQueue.length(),
+                            validatorSet: runningValidatorSet.get(ProviderChain)
+                        }
+                    )
+                )
+            else
+                // otherwise, don't send any packets
+                outstandingPacketsToConsumer,
+        CONSUMER_NOOP,
+        // no packets are sent to the provider
+        outstandingPacketsToProvider' = outstandingPacketsToProvider,
+        // do not receive any maturations
+        receivedMaturations' = receivedMaturations,
+    }
+
+    action endAndBeginBlockForConsumer(consumer: Chain): bool = all {
+        ConsumerChains.contains(consumer),
+        // update the voting power history
+        votingPowerHistories' = votingPowerHistories.set(consumer, getUpdatedHistory(consumer)),
+        // the running validator set is now for sure the current validator set,
+        // so start with it in the next block
+        runningValidatorSet' = runningValidatorSet,
+        // compute mature packets whose maturation time has passed
+        val maturedPackets = maturationTimes.get(consumer).keys().filter(
+            packet => 
+            val maturationTime = maturationTimes.get(consumer).get(packet)
+            maturationTime <= curChainTimes.get(consumer)
+        )
+        all {
+            // remove matured packets from the maturation times
+            maturationTimes' = maturationTimes.set(consumer, maturationTimes.get(consumer).mapRemoveAll(maturedPackets)),
+            // send matured packets
+            outstandingPacketsToProvider' = outstandingPacketsToProvider.set(
+                consumer, 
+                // construct VSCMaturedPackets from the matured VSCPackets
+                outstandingPacketsToProvider.get(consumer).concat(
+                    maturedPackets.map(packet => {id: packet.id}).toList()
+                )
+            )
+        },
+        PROVIDER_NOOP,
+        // no packets are sent to consumer or received by it
+        outstandingPacketsToConsumer' = outstandingPacketsToConsumer,
+    }
+
+    // the timestamp for each chain is advanced nondeterministically
+    action advanceTimestamps(): bool =
+        curChainTimes' = curChainTimes.keys().mapBy(
+            (chain) => 
+            nondet advancement = oneOf(0.to(100))
+            curChainTimes.get(chain) + advancement
+        )
+
+    // each consumer chain may nondeterministically advance in the order
+    // unused -> initializing -> running -> stopped
+    // some events may necessitate a transition, e.g. timeouts
+    action AdvanceConsumers: bool = 
+        consumerStatus' = consumerStatus.keys().mapBy(
+            (chain) => 
+            val curStatus = consumerStatus.get(chain)
+            // if the current status is unused, it may transition to running
+            if (curStatus == "unused") {
+                nondet transition = oneOf(0.to(1))
+                if (transition == 0)
+                {
+                    "running"
+                } else {
+                    "unused"
+                }
+            }
+            else if (curStatus == "running") {
+                // the chain may transition to stopped.
+                // it is *forced* to stop if a packet timed out,
+                // or if the inactivity timeout has passed
+            } else {
+                "unused"
+            }
+
+            // if the current status is initializing, it may transition to running
+        )
+
+
+    action step: bool = 
+    all {  
+        // timestamps can be advanced in each step
+        advanceTimestamps,  
+        any {
+            nondet node = oneOf(Nodes)
+            nondet amount = oneOf(1.to(10))
+            votingPowerChange(node, amount),
+            recvPacketOnProvider(oneOf(ConsumerChains)),
+            recvPacketOnConsumer(oneOf(ConsumerChains)),
+            nondet chain = oneOf(chains)
+            endAndBeginBlock(chain),
+        }
+    }
+
+    // PROPERTIES
+
+    // Every validator set on any consumer chain MUST either be or
+    // have been a validator set on the provider chain.
+    val ValidatorSetReplication: bool = 
+        chains.forall(
+            chain => chain.getCurrentValidatorSet().wasValidatorSetOnProvider()
+        )
+}
\ No newline at end of file
diff --git a/tests/difference/core/quint_model/staking.qnt b/tests/difference/core/quint_model/staking.qnt
deleted file mode 100644
index bcb944cd41..0000000000
--- a/tests/difference/core/quint_model/staking.qnt
+++ /dev/null
@@ -1,138 +0,0 @@
-module ccv {
-    import extraSpells.* from "./extraSpells"
-
-    // Things that are not modelled:
-    // * Reward distribution
-    
-    // TYPE DEFINITIONS
-    type Chain = str
-    type Validator = {
-        identifier: str,
-        // for simplciity, voting power is equal to amount of tokens
-        votingPower: int
-    }
-    type Height = int
-    type Timestamp = int
-
-    type Infraction = 
-        {
-            validator: Validator,
-            infractionType: str,
-            // slash fraction in percent, i.e. 80 means 80%
-            slashFraction: int,
-            // the height at which the infraction was committed
-            infractionHeight: Height,
-            // the timestamp at which the infraction was committed
-            infractionTime: Timestamp,
-            // the chain on which the infraction was committed
-            originChain: Chain,
-        }
-
-    type Block = 
-        {
-            validatorSet: Set[Validator],
-            blockHeight: Height,
-            blockTime: Timestamp,
-            chain: Chain,
-            // Infrations comitted on this chain in this block.
-            comittedInfractions: Set[Infraction],
-            // Evidence received by this chain in this block.
-            receivedEvidence: Set[Infraction] // only used on the provider
-        }
-
-    type Slash = 
-        {
-            validator: Validator,
-            slashAmount: int,
-            slashHeight: Height,
-            slashTime: Timestamp,
-            chain: Chain,
-            infraction: Infraction
-        }
-
-
-    // MODEL PARAMETERS
-    const UnbondingPeriod: int
-
-    // MODEL STATE
-
-    // The singular provider chain.
-    var providerChain: Chain
-
-    // The set of (possible) consumer chains that are being tracked.
-    var chains: Set[Chain]
-
-    // Stores, for each chain, the list of blocks over its entire existence.
-    // Each height should occur at most once, and no height should be skipped.
-    // Blocks should be ordered by height in descending order.
-    var blockHistories: Chain -> List[Block]
-    
-    // Stores, for each chain, whether it is currently a consumer chain.
-    var consumerStatus: Chain -> bool
-
-    var slashes: Set[Slash]
-
-    // UTILITY FUNCTIONS
-    def getCurrentHeight(chain: Chain): Height = {
-        blockHistories.get(chain).head().blockHeight
-    }
-
-    def getLatestBlock(chain: Chain): Block = {
-        blockHistories.get(chain).head()
-    }
-
-    def isConsumer(chain: Chain): bool = {
-        consumerStatus.get(chain)
-    }
-
-    def wasValidatorSetOnProvider(validatorSet: Set[Validator]): bool = {
-        blockHistories.get(providerChain).toSet().exists(
-            block => block.validatorSet == validatorSet
-        )
-    }
-
-    // PROPERTIES
-
-    // Every validator set on any consumer chain MUST either be or
-    // have been a validator set on the provider chain.
-    val ValidatorSetReplication: bool = 
-        chains.filter(chain => chain.isConsumer()).forall(
-            chain => chain.getLatestBlock().validatorSet.wasValidatorSetOnProvider()
-        )
-
-    // TODO: This is extremely convoluted, maybe coming later?
-    val BondBasedConsumerVotingPower: bool =
-        true
-
-    // If a validator val commits an infraction, with a slashing fraction of sf,
-    // on a consumer chain cc at a block height hi,
-    // then any evidence of misbehavior that is received by cc at height he,
-    // such that ts(he) < ts(hi) + UnbondingPeriod, MUST results in exactly the amount of tokens
-    // sf*Token(Power(cc,hi,val)) to be slashed on the provider chain.
-    // Furthermore, val MUST NOT be slashed more than once for the same misbehavior.
-    val SlashableConsumerMisbehaviour: bool =
-        val latestProviderBlock = providerChain.getLatestBlock()
-        latestProviderBlock.receivedEvidence.forall(
-            // for each evidence the provider chain received
-            evidence => 
-                // if the evidence is received before it is outdated
-                (evidence.infractionTime < latestProviderBlock.blockTime - UnbondingPeriod)
-                    implies
-                // the provider needs to slash the validator
-                val expectedSlash =
-                    {
-                        validator: evidence.validator,
-                        // the amount depends on the voting power during the infraction
-                        slashAmount: evidence.validator.votingPower * evidence.slashFraction,
-                        slashHeight: latestProviderBlock.blockHeight,
-                        slashTime: latestProviderBlock.blockTime,
-                        chain: providerChain,
-                        infraction: evidence
-                    }
-                slashes.exists(slash => slash == expectedSlash)
-        )
-
-        val ValidatorUpdateInclusion: bool =
-            true
-
-}
\ No newline at end of file

From 2155a4f15e5d89032b6d9807c5a61049b57d94c0 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Thu, 24 Aug 2023 13:17:19 +0200
Subject: [PATCH 03/80] Add first finished draft of model

---
 tests/difference/core/quint_model/model.qnt | 180 ++++++++++++++++----
 1 file changed, 146 insertions(+), 34 deletions(-)

diff --git a/tests/difference/core/quint_model/model.qnt b/tests/difference/core/quint_model/model.qnt
index 6c78f6fb64..b89f816b9d 100644
--- a/tests/difference/core/quint_model/model.qnt
+++ b/tests/difference/core/quint_model/model.qnt
@@ -19,36 +19,54 @@ module ccv {
             // the identifier for this packet
             id: int,
             // the new validator set. in the implementation, this would be a list of validator updates
-            validatorSet: ValidatorSet
+            validatorSet: ValidatorSet,
+            // the time, that when passed on the receiver chain, will mean the packet is considered timed out
+            timeout: Timestamp
         }
 
     type VSCMaturedPacket = 
         {
             // the id of the VSCPacket that matured
-            id: int
+            id: int,
+            // the time, that when passed on the receiver chain, will mean the packet is considered timed out
+            timeout: Timestamp
         }
     
     // MODEL PARAMETERS
-    // length of the unbonding period on each chain
-    const UnbondingPeriod: Chain -> int
+        
 
     // set of identifiers of potential nodes
-    const Nodes: Set[Node]
+    pure val Nodes: Set[Node] = 
+        Set("A", "B", "C", "D", "E", "F", "G", "H", "I", "J")
 
     // the set of consumer chains
-    const ConsumerChains: Set[Chain]
+    pure val ConsumerChains: Set[Chain] = 
+        Set("chain1", "chain2", "chain3")
 
     // The singular provider chain.
-    const ProviderChain: Chain
-
+    pure val ProviderChain: Chain = 
+        "provider"
+        
     pure val chains = ConsumerChains.union(Set(ProviderChain))
 
+    // length of the unbonding period on each chain
+    pure val UnbondingPeriod: Chain -> int = chains.mapBy(
+        (chain) => 
+        10
+    )
+
     // the time until a packet times out
-    const PacketTimeout: int
+    pure val PacketTimeout: int = 
+        5
 
     // the time until a consumer chain is dropped by the provider due to inactivity
-    const InactivityTimeout: int
+    pure val InactivityTimeout: int =
+        10
 
+    // consumer statuses
+    pure val STOPPED = "stopped"
+    pure val RUNNING = "running"
+    pure val UNUSED = "unused"
 
     // MODEL STATE
     // --SHARED STATE
@@ -88,6 +106,9 @@ module ccv {
     // the set of VSCMaturedPackets received by the provider chain
     var receivedMaturations: Set[VSCMaturedPacket]
 
+    // stores which VSC Packets have been sent to compare with receivedMaturations to detect timeouts due to non-responsiveness
+    var sentVSCPackets: Chain -> Set[VSCPacket]
+
 
     // UTILITY FUNCTIONS & ACTIONS
     def wasValidatorSetOnProvider(validatorSet: ValidatorSet): bool = {
@@ -105,6 +126,34 @@ module ccv {
         else
         oldValidatorSet.mapRemove(validator)
 
+    // returns true if the consumer has timed out and should be dropped
+    def consumerTimedOut(consumer: Chain): bool =
+        any {
+            // either a package from provider to consumer has timed out
+            outstandingPacketsToConsumer.get(consumer).select(
+                packet => packet.timeout <= curChainTimes.get(consumer)
+            ).length() > 0,
+            // or a package from consumer to provider has timed out
+            outstandingPacketsToProvider.get(consumer).select(
+                packet => packet.timeout <= curChainTimes.get(ProviderChain)
+            ).length() > 0,
+            // or the inactivity timeout has passed since a VSCPacket was sent to the consumer, but the
+            // provider has not received a VSCMaturedPacket for it
+            val packetsWithoutResponse = sentVSCPackets.get(consumer).filter( // get packets without response
+                packet => 
+                not(receivedMaturations.exists(
+                    maturedPacket => maturedPacket.id == packet.id
+                ))
+            )
+            // among those, get packets where inactivity timeout has passed
+            packetsWithoutResponse.filter(
+                packet => 
+                val sentAt = curChainTimes.get(ProviderChain) - PacketTimeout // compute when the packet was sent
+                val timesOutAt = sentAt + InactivityTimeout // compute when the packet times out
+                timesOutAt <= curChainTimes.get(ProviderChain)
+            ).size() > 0
+        }
+
     // utility action that leaves all provider state untouched
     action PROVIDER_NOOP(): bool = 
         all {
@@ -213,14 +262,15 @@ module ccv {
         outstandingPacketsToConsumer' = 
             // if running validator set is not equal to the last one in the history
             if (runningValidatorSet.get(ProviderChain) != votingPowerHistories.get(ProviderChain).head())
-                // then send a packet to each consumer
-                outstandingPacketsToConsumer.keys().mapBy(
+                // then send a packet to each running consumer
+                outstandingPacketsToConsumer.keys().filter(consumer => consumerStatus.get(consumer) == RUNNING).mapBy(
                     (consumer) => 
                     val packetQueue = outstandingPacketsToConsumer.get(consumer)
                     packetQueue.append(
                         {
                             id: packetQueue.length(),
-                            validatorSet: runningValidatorSet.get(ProviderChain)
+                            validatorSet: runningValidatorSet.get(ProviderChain),
+                            timeout: curChainTimes.get(ProviderChain) + PacketTimeout
                         }
                     )
                 )
@@ -255,7 +305,7 @@ module ccv {
                 consumer, 
                 // construct VSCMaturedPackets from the matured VSCPackets
                 outstandingPacketsToProvider.get(consumer).concat(
-                    maturedPackets.map(packet => {id: packet.id}).toList()
+                    maturedPackets.map(packet => {id: packet.id, timeout: 5}).toList()
                 )
             )
         },
@@ -265,46 +315,59 @@ module ccv {
     }
 
     // the timestamp for each chain is advanced nondeterministically
-    action advanceTimestamps(): bool =
+    action AdvanceTimestamps(): bool =
         curChainTimes' = curChainTimes.keys().mapBy(
             (chain) => 
             nondet advancement = oneOf(0.to(100))
             curChainTimes.get(chain) + advancement
-        )
+        )        
 
-    // each consumer chain may nondeterministically advance in the order
-    // unused -> initializing -> running -> stopped
-    // some events may necessitate a transition, e.g. timeouts
-    action AdvanceConsumers: bool = 
+    // each consumer chain may advance in the order
+    // some events may necessitate a transition, e.g. timeouts.
+    // shouldAdvance gives, for each consumer chain, whether it should advance if possible.
+    // if a chain has to advance, e.g. due to timeouts, or may not advance, the value will have no effect.
+    action AdvanceConsumers(shouldAdvance: Chain -> bool): bool = 
         consumerStatus' = consumerStatus.keys().mapBy(
-            (chain) => 
+            chain => 
             val curStatus = consumerStatus.get(chain)
-            // if the current status is unused, it may transition to running
-            if (curStatus == "unused") {
-                nondet transition = oneOf(0.to(1))
-                if (transition == 0)
+            if (curStatus == UNUSED) {
+                if (shouldAdvance.get(chain))
                 {
-                    "running"
+                    RUNNING
                 } else {
-                    "unused"
+                    UNUSED
                 }
             }
-            else if (curStatus == "running") {
+            else if (curStatus == RUNNING) {
                 // the chain may transition to stopped.
                 // it is *forced* to stop if a packet timed out,
                 // or if the inactivity timeout has passed
+                if(consumerTimedOut(chain)) {
+                    STOPPED
+                } else {
+                    if (shouldAdvance.get(chain)) {
+                        RUNNING
+                    } else {
+                        STOPPED
+                    }
+                }
             } else {
-                "unused"
+                // stopped chains cannot restart, we assume a new chain would be started in that case
+                STOPPED
             }
-
-            // if the current status is initializing, it may transition to running
         )
 
+    // stores the VSCPackets sent in this step in sentVSCPackets
+    action StoreSentPackets: bool = 
+        sentVSCPackets' = sentVSCPackets.keys().mapBy(
+            (chain) => 
+            sentVSCPackets.get(chain).union(outstandingPacketsToConsumer.get(chain).toSet())
+        )
 
     action step: bool = 
-    all {  
+    all  {
         // timestamps can be advanced in each step
-        advanceTimestamps,  
+        AdvanceTimestamps,  
         any {
             nondet node = oneOf(Nodes)
             nondet amount = oneOf(1.to(10))
@@ -313,7 +376,56 @@ module ccv {
             recvPacketOnConsumer(oneOf(ConsumerChains)),
             nondet chain = oneOf(chains)
             endAndBeginBlock(chain),
-        }
+        },
+        StoreSentPackets,
+        val shouldAdvance = ConsumerChains.mapBy(
+            chain => 
+            nondet should = oneOf(Set(true, false))
+            should
+        )
+        AdvanceConsumers(shouldAdvance),
+    }
+    
+
+    def getArbitraryValidatorSet(): ValidatorSet = 
+        val numValidators = oneOf(1.to(Nodes.size()))
+        // toList has nondeterministic behaviour, so this gets arbitrary validators
+        val validators = Nodes.toList().slice(0, numValidators).toSet()
+        validators.mapBy(
+            validator => 
+            nondet votingPower = oneOf(1.to(10))
+            votingPower
+        )
+
+    action init: bool = 
+    all {
+        // voting power histories are empty
+        votingPowerHistories' = 
+            chains.mapBy(
+                (chain) => 
+                List()
+            ),
+        // provider chain gets an arbitrary validator set, consumer chains have none
+        runningValidatorSet' =
+            chains.mapBy(
+                (chain) => 
+                if (chain == ProviderChain) getArbitraryValidatorSet else Map()
+            ),
+        // each chain starts at time 0
+        curChainTimes' = chains.mapBy(
+            (chain) => 0
+        ),
+        // all consumer chains are unused
+        consumerStatus' = chains.mapBy(chain => UNUSED),
+        // no packets are outstanding
+        outstandingPacketsToProvider' = chains.mapBy(chain => List()),
+        outstandingPacketsToConsumer' = chains.mapBy(chain => List()),
+        // no maturations have been received by provider
+        receivedMaturations' = Set(),
+        // no packets have been sent to consumers
+        sentVSCPackets' = chains.mapBy(chain => Set()),
+        // no packets have been received by consumers, so no maturation times set
+        maturationTimes' = chains.mapBy(chain => Map()),
     }
 
     // PROPERTIES

From 6ca65105e8b044c03b9d0006ed212009239512af Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 25 Aug 2023 09:53:47 +0200
Subject: [PATCH 04/80] Add test run to model

---
 tests/difference/core/quint_model/model.qnt | 149 ++++++++++++++++----
 1 file changed, 125 insertions(+), 24 deletions(-)

diff --git a/tests/difference/core/quint_model/model.qnt b/tests/difference/core/quint_model/model.qnt
index b89f816b9d..aa3378bca6 100644
--- a/tests/difference/core/quint_model/model.qnt
+++ b/tests/difference/core/quint_model/model.qnt
@@ -68,6 +68,23 @@ module ccv {
     pure val RUNNING = "running"
     pure val UNUSED = "unused"
 
+    // utility: a map assigning each chain to 0, used for not advancing timestamps
+    pure val NoTimeAdvancement: Chain -> int = chains.mapBy(
+        (chain) => 
+        0
+    )
+
+
+    // utility: a map assigning each chain to false, used for not advancing consumer status
+    pure val NoStatusAdvancement: Chain -> bool = chains.mapBy(
+        (chain) => 
+        false
+    )
+
+    // utility: the set of consumers currently running
+    val RunningConsumers: Set[Chain] = 
+        ConsumerChains.filter(chain => consumerStatus.get(chain) == RUNNING)
+
     // MODEL STATE
     // --SHARED STATE
 
@@ -186,6 +203,12 @@ module ccv {
             CONSUMER_NOOP,
             // voting power history is only updated on endAndBeginBlock
             votingPowerHistories' = votingPowerHistories,
+            // consumer statusses do not change
+            consumerStatus' = consumerStatus,
+            // chain times do not change
+            curChainTimes' = curChainTimes,
+            // update the packet store on the provider
+            StoreSentPackets,
         }
 
     // deliver the next outstanding packet from the consumer to the provider.
@@ -204,6 +227,12 @@ module ccv {
         votingPowerHistories' = votingPowerHistories,
         // no validator set changes are made
         runningValidatorSet' = runningValidatorSet,
+        // consumer statusses do not change
+        consumerStatus' = consumerStatus,
+        // chain times do not change
+        curChainTimes' = curChainTimes,
+        // update the packet store on the provider
+        StoreSentPackets,
     }
 
     // deliver the next outstanding packet from the provider to the consumer.
@@ -226,6 +255,12 @@ module ccv {
         PROVIDER_NOOP,
         votingPowerHistories' = votingPowerHistories,
         outstandingPacketsToProvider' = outstandingPacketsToProvider,
+        // consumer statusses do not change
+        consumerStatus' = consumerStatus,
+        // chain times do not change
+        curChainTimes' = curChainTimes,
+        // update the packet store on the provider
+        StoreSentPackets,
     }
 
     // ends the current block and starts the next block for a given chain.
@@ -282,6 +317,12 @@ module ccv {
         outstandingPacketsToProvider' = outstandingPacketsToProvider,
         // do not receive any maturations
         receivedMaturations' = receivedMaturations,
+        // consumer statusses do not change
+        consumerStatus' = consumerStatus,
+        // chain times do not change
+        curChainTimes' = curChainTimes,
+        // update the packet store on the provider
+        StoreSentPackets,
     }
 
     action endAndBeginBlockForConsumer(consumer: Chain): bool = all {
@@ -312,22 +353,49 @@ module ccv {
         PROVIDER_NOOP,
         // no packets are sent to consumer or received by it
         outstandingPacketsToConsumer' = outstandingPacketsToConsumer,
+        // consumer statusses do not change
+        consumerStatus' = consumerStatus,
+        // chain times do not change
+        curChainTimes' = curChainTimes,
+        // update the packet store on the provider
+        StoreSentPackets,
     }
 
-    // the timestamp for each chain is advanced nondeterministically
-    action AdvanceTimestamps(): bool =
-        curChainTimes' = curChainTimes.keys().mapBy(
-            (chain) => 
-            nondet advancement = oneOf(0.to(100))
-            curChainTimes.get(chain) + advancement
-        )        
+    // advance timestamps for maps nondeterministically
+    action AdvanceTime(): bool = 
+            val advanceAmounts = curChainTimes.keys().mapBy(
+                chain =>    
+                nondet amount = oneOf(1.to(10))
+                amount
+            )
+            AdvanceTimeByMap(advanceAmounts)
+
+    // the timestamp for each chain is advanced by the given amount
+    action AdvanceTimeByMap(advancementAmount: Chain -> int): bool = all
+        {
+            curChainTimes' = curChainTimes.keys().mapBy(
+                chain => 
+                curChainTimes.get(chain) + advancementAmount.get(chain)
+            ),
+            // all other variables are left untouched
+            votingPowerHistories' = votingPowerHistories,
+            runningValidatorSet' = runningValidatorSet,
+            outstandingPacketsToProvider' = outstandingPacketsToProvider,
+            outstandingPacketsToConsumer' = outstandingPacketsToConsumer,
+            receivedMaturations' = receivedMaturations,
+            maturationTimes' = maturationTimes,
+            // chain times do not change
+            consumerStatus' = consumerStatus,
+            // update the packet store on the provider
+            StoreSentPackets,
+        }
 
     // each consumer chain may advance in the order
     // some events may necessitate a transition, e.g. timeouts.
     // shouldAdvance gives, for each consumer chain, whether it should advance if possible.
     // if a chain has to advance, e.g. due to timeouts, or may not advance, the value will have no effect.
     action AdvanceConsumers(shouldAdvance: Chain -> bool): bool = 
-        consumerStatus' = consumerStatus.keys().mapBy(
+        val newConsumerStatus = consumerStatus.keys().mapBy(
             chain => 
             val curStatus = consumerStatus.get(chain)
             if (curStatus == UNUSED) {
@@ -355,7 +423,30 @@ module ccv {
                 // stopped chains cannot restart, we assume a new chain would be started in that case
                 STOPPED
             }
-        )
+            )
+        all {
+            consumerStatus' = newConsumerStatus,
+            // all other variables are left untouched
+            votingPowerHistories' = votingPowerHistories,
+            runningValidatorSet' = runningValidatorSet.keys().mapBy(
+                chain => 
+                if (newConsumerStatus.get(chain) == RUNNING and consumerStatus.get(chain) == UNUSED) 
+                // consumers that went from unused to running start with the current validator set on the provider
+                { 
+                    runningValidatorSet.get(ProviderChain) 
+                } else {
+                    runningValidatorSet.get(chain)
+                }
+            ),
+            outstandingPacketsToProvider' = outstandingPacketsToProvider,
+            outstandingPacketsToConsumer' = outstandingPacketsToConsumer,
+            receivedMaturations' = receivedMaturations,
+            maturationTimes' = maturationTimes,
+            // chain times do not change
+            curChainTimes' = curChainTimes,
+            // update the packet store on the provider
+            StoreSentPackets,
+        }
 
     // stores the VSCPackets sent in this step in sentVSCPackets
     action StoreSentPackets: bool = 
@@ -364,20 +455,17 @@ module ccv {
             sentVSCPackets.get(chain).union(outstandingPacketsToConsumer.get(chain).toSet())
         )
 
-    action step: bool = 
-    all  {
-        // timestamps can be advanced in each step
-        AdvanceTimestamps,  
-        any {
-            nondet node = oneOf(Nodes)
-            nondet amount = oneOf(1.to(10))
-            votingPowerChange(node, amount),
-            recvPacketOnProvider(oneOf(ConsumerChains)),
-            recvPacketOnConsumer(oneOf(ConsumerChains)),
-            nondet chain = oneOf(chains)
-            endAndBeginBlock(chain),
-        },
-        StoreSentPackets,
+    
+    // the main step action 
+    action step: bool = any {
+        AdvanceTime,
+        nondet node = oneOf(Nodes)
+        nondet amount = oneOf(1.to(10))
+        votingPowerChange(node, amount),
+        recvPacketOnProvider(oneOf(ConsumerChains)),
+        recvPacketOnConsumer(oneOf(ConsumerChains)),
+        nondet chain = oneOf(chains)
+        endAndBeginBlock(chain),
         val shouldAdvance = ConsumerChains.mapBy(
             chain => 
             nondet should = oneOf(Set(true, false))
@@ -385,7 +473,6 @@ module ccv {
         )
         AdvanceConsumers(shouldAdvance),
     }
-    
 
     def getArbitraryValidatorSet(): ValidatorSet = 
         val numValidators = oneOf(1.to(Nodes.size()))
@@ -397,6 +484,7 @@ module ccv {
             votingPower
         )
 
+    // INITIALIZATION
     action init: bool = 
     all {
         // voting power histories are empty
@@ -436,4 +524,17 @@ module ccv {
         chains.forall(
             chain => chain.getCurrentValidatorSet().wasValidatorSetOnProvider()
         )
+
+    // TESTS
+    run VSCHappyPath: bool = {
+        init
+        // trigger a votingPowerChange on the provider chain
+        .then(votingPowerChange("A", 10))
+        // endAndBeginBlock on provider. No consumer chains are running, so no packets are sent
+        .then(endAndBeginBlock(ProviderChain))
+        // advance chain1 to running
+        .then(AdvanceConsumers(NoStatusAdvancement.set("chain1", true)))
+    }
+
+
 }
\ No newline at end of file

From e27e74b98c6f4bb2da7fd7da3124619a341c19f5 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 25 Aug 2023 15:20:01 +0200
Subject: [PATCH 05/80] Rename model, add test, use powerset for nondeterminism

---
 .../core/quint_model/{model.qnt => ccv.qnt}   | 95 ++++++++++++++-----
 1 file changed, 72 insertions(+), 23 deletions(-)
 rename tests/difference/core/quint_model/{model.qnt => ccv.qnt} (86%)

diff --git a/tests/difference/core/quint_model/model.qnt b/tests/difference/core/quint_model/ccv.qnt
similarity index 86%
rename from tests/difference/core/quint_model/model.qnt
rename to tests/difference/core/quint_model/ccv.qnt
index aa3378bca6..86dbccf523 100644
--- a/tests/difference/core/quint_model/model.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -74,6 +74,20 @@ module ccv {
         0
     )
 
+    // utility: a struct summarizing the current state
+    val state = 
+        {
+            votingPowerHistories: votingPowerHistories,
+            runningValidatorSet: runningValidatorSet,
+            curChainTimes: curChainTimes,
+            consumerStatus: consumerStatus,
+            outstandingPacketsToProvider: outstandingPacketsToProvider,
+            outstandingPacketsToConsumer: outstandingPacketsToConsumer,
+            maturationTimes: maturationTimes,
+            receivedMaturations: receivedMaturations,
+            sentVSCPackets: sentVSCPackets,
+        }
+
 
     // utility: a map assigning each chain to false, used for not advancing consumer status
     pure val NoStatusAdvancement: Chain -> bool = chains.mapBy(
@@ -249,7 +263,7 @@ module ccv {
             // as that only happens when the next block is started
             runningValidatorSet' = runningValidatorSet.set(consumer, packet.validatorSet),
             // add the new packet and store its maturation time
-            val newMaturationTimes = maturationTimes.get(consumer).set(packet, curChainTimes.get(consumer) + UnbondingPeriod.get(consumer))
+            val newMaturationTimes = maturationTimes.get(consumer).put(packet, curChainTimes.get(consumer) + UnbondingPeriod.get(consumer))
             maturationTimes' = maturationTimes.set(consumer, newMaturationTimes)
         },
         PROVIDER_NOOP,
@@ -298,16 +312,20 @@ module ccv {
             // if running validator set is not equal to the last one in the history
             if (runningValidatorSet.get(ProviderChain) != votingPowerHistories.get(ProviderChain).head())
                 // then send a packet to each running consumer
-                outstandingPacketsToConsumer.keys().filter(consumer => consumerStatus.get(consumer) == RUNNING).mapBy(
+                outstandingPacketsToConsumer.keys().mapBy(
                     (consumer) => 
                     val packetQueue = outstandingPacketsToConsumer.get(consumer)
-                    packetQueue.append(
-                        {
-                            id: packetQueue.length(),
-                            validatorSet: runningValidatorSet.get(ProviderChain),
-                            timeout: curChainTimes.get(ProviderChain) + PacketTimeout
-                        }
-                    )
+                    if (consumerStatus.get(consumer) == RUNNING) {
+                        packetQueue.append(
+                            {
+                                id: packetQueue.length(),
+                                validatorSet: runningValidatorSet.get(ProviderChain),
+                                timeout: curChainTimes.get(ProviderChain) + PacketTimeout
+                            }
+                        )
+                    } else {
+                        packetQueue
+                    }
                 )
             else
                 // otherwise, don't send any packets
@@ -474,10 +492,12 @@ module ccv {
         AdvanceConsumers(shouldAdvance),
     }
 
+    pure val nodePowerSet = Nodes.powerset()
+
     def getArbitraryValidatorSet(): ValidatorSet = 
-        val numValidators = oneOf(1.to(Nodes.size()))
+        nondet numValidators = oneOf(1.to(Nodes.size()))
         // toList has nondeterministic behaviour, so this gets arbitrary validators
-        val validators = Nodes.toList().slice(0, numValidators).toSet()
+        nondet validators = oneOf(nodePowerSet.filter(s => s.size() == numValidators))
         validators.mapBy(
             validator => 
             nondet votingPower = oneOf(1.to(10))
@@ -487,18 +507,18 @@ module ccv {
     // INITIALIZATION
     action init: bool = 
     all {
-        // voting power histories are empty
-        votingPowerHistories' = 
-            chains.mapBy(
-                (chain) => 
-                List()
-            ),
+        val validatorSets = chains.mapBy(
+            (chain) => 
         // provider chain gets an arbitrary validator set, consumer chains have none
-        runningValidatorSet' =
-            chains.mapBy(
+            if (chain == ProviderChain) getArbitraryValidatorSet else Map()
+        )
+        all {
+            votingPowerHistories' = chains.mapBy(
                 (chain) => 
-                if (chain == ProviderChain) getArbitraryValidatorSet else Map()
+                List(validatorSets.get(chain))
             ),
+            runningValidatorSet' = validatorSets,
+        },
         // each chain starts at time 0
         curChainTimes' = chains.mapBy(
             (chain) => 0
@@ -526,14 +546,43 @@ module ccv {
         )
 
     // TESTS
-    run VSCHappyPath: bool = {
+    run VSCHappyPathTest: bool = {
         init
         // trigger a votingPowerChange on the provider chain
         .then(votingPowerChange("A", 10))
         // endAndBeginBlock on provider. No consumer chains are running, so no packets are sent
         .then(endAndBeginBlock(ProviderChain))
-        // advance chain1 to running
-        .then(AdvanceConsumers(NoStatusAdvancement.set("chain1", true)))
+        .then(all {
+            // no packet was sent
+            assert(outstandingPacketsToConsumer.get("chain1").length() == 0),
+            // advance chain1 to running
+            AdvanceConsumers(NoStatusAdvancement.set("chain1", true))
+        })
+        // consumer chain should have current validator set from provider
+        .then(
+            all { 
+                // since consumer chain just started, its assumed to have the validator set from provider
+                assert(runningValidatorSet.get("chain1") == runningValidatorSet.get(ProviderChain)),
+                // trigger a votingPowerChange on the provider chain
+                votingPowerChange("B", 10)
+            }
+        )
+        .then(endAndBeginBlock(ProviderChain))
+        // now the provider should send a packet on block end
+        .then(all {
+            // a packet was sent
+            assert(outstandingPacketsToConsumer.get("chain1").length() == 1),
+            // deliver the packet to the consumer
+            recvPacketOnConsumer("chain1")
+        })
+        .then(all {
+            // the consumer should have the new validator set
+            assert(runningValidatorSet.get("chain1") == runningValidatorSet.get(ProviderChain)),
+            // the old validator set should be in the history
+            assert(votingPowerHistories.get("chain1").head() == Map("A" -> 10)),
+            // put a last action to satisfy the action effect
+            AdvanceConsumers(NoStatusAdvancement)
+        })
     }
 
 

From 50fae345fa1f3a7f42ad933ff1e33390e3003c3e Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 25 Aug 2023 17:49:42 +0200
Subject: [PATCH 06/80] Reintroduce vsc changed tracking variables

---
 tests/difference/core/quint_model/ccv.qnt | 110 +++++++++++++---------
 1 file changed, 67 insertions(+), 43 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 86dbccf523..131a490d8a 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -140,6 +140,12 @@ module ccv {
     // stores which VSC Packets have been sent to compare with receivedMaturations to detect timeouts due to non-responsiveness
     var sentVSCPackets: Chain -> Set[VSCPacket]
 
+    // stores whether, in this step, the validator set considered to be changed.
+    // this is needed because the validator set might be considered to have changed, even though
+    // it is still technically identical at our level of abstraction, e.g. a validator power change on the provider
+    // might leave the validator set the same because a delegation and undelegation cancel each other out.
+    var providerValidatorSetChangedInThisBlock: bool
+
 
     // UTILITY FUNCTIONS & ACTIONS
     def wasValidatorSetOnProvider(validatorSet: ValidatorSet): bool = {
@@ -153,7 +159,7 @@ module ccv {
 
     def getUpdatedValidatorSet(oldValidatorSet: ValidatorSet, validator: Node, newVotingPower: int): ValidatorSet =
         if (newVotingPower > 0) 
-        oldValidatorSet.set(validator, newVotingPower)
+        oldValidatorSet.put(validator, newVotingPower)
         else
         oldValidatorSet.mapRemove(validator)
 
@@ -211,7 +217,7 @@ module ccv {
             // set the running validator set on the provider chain, but don't update the history yet
             runningValidatorSet' = runningValidatorSet.set(ProviderChain, newValidatorSet),
             // no packets are sent yet, these are only sent on endAndBeginBlock
-            outstandingPacketsToConsumer' = outstandingPacketsToConsumer,
+            RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
             outstandingPacketsToProvider' = outstandingPacketsToProvider,
             receivedMaturations' = receivedMaturations,
             CONSUMER_NOOP,
@@ -221,8 +227,8 @@ module ccv {
             consumerStatus' = consumerStatus,
             // chain times do not change
             curChainTimes' = curChainTimes,
-            // update the packet store on the provider
-            StoreSentPackets,
+            // the validator set is considered to have changed
+            providerValidatorSetChangedInThisBlock' = true,
         }
 
     // deliver the next outstanding packet from the consumer to the provider.
@@ -237,7 +243,7 @@ module ccv {
         val maturedPacket = outstandingPacketsToProvider.get(consumer).head()
         receivedMaturations' = receivedMaturations.add(maturedPacket),
         CONSUMER_NOOP,
-        outstandingPacketsToConsumer' = outstandingPacketsToConsumer,
+        RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
         votingPowerHistories' = votingPowerHistories,
         // no validator set changes are made
         runningValidatorSet' = runningValidatorSet,
@@ -245,8 +251,8 @@ module ccv {
         consumerStatus' = consumerStatus,
         // chain times do not change
         curChainTimes' = curChainTimes,
-        // update the packet store on the provider
-        StoreSentPackets,
+        // the validator set was not changed by this action (but might have been changed before in this block)
+        providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
     }
 
     // deliver the next outstanding packet from the provider to the consumer.
@@ -256,7 +262,8 @@ module ccv {
         outstandingPacketsToConsumer.get(consumer).length() > 0,
         // remove packet from outstanding packets
         val newPacketQueue = outstandingPacketsToConsumer.get(consumer).tail()
-        outstandingPacketsToConsumer' = outstandingPacketsToConsumer.set(consumer, newPacketQueue),
+        val newOutstandingPackets = outstandingPacketsToConsumer.set(consumer, newPacketQueue)
+        RegisterNewOutstandingPackets(newOutstandingPackets),
         val packet = outstandingPacketsToConsumer.get(consumer).head()
         all {
             // update the running validator set, but not the history yet,
@@ -273,8 +280,8 @@ module ccv {
         consumerStatus' = consumerStatus,
         // chain times do not change
         curChainTimes' = curChainTimes,
-        // update the packet store on the provider
-        StoreSentPackets,
+        // the validator set was not changed by this action (but might have been changed before in this block)
+        providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
     }
 
     // ends the current block and starts the next block for a given chain.
@@ -308,9 +315,9 @@ module ccv {
         // so start with it in the next block
         runningValidatorSet' = runningValidatorSet,
         // send VSCPackets to consumers
-        outstandingPacketsToConsumer' = 
-            // if running validator set is not equal to the last one in the history
-            if (runningValidatorSet.get(ProviderChain) != votingPowerHistories.get(ProviderChain).head())
+        val newOutstandingPackets = 
+            // if running validator set is considered to have changed
+            if (providerValidatorSetChangedInThisBlock)
                 // then send a packet to each running consumer
                 outstandingPacketsToConsumer.keys().mapBy(
                     (consumer) => 
@@ -329,7 +336,8 @@ module ccv {
                 )
             else
                 // otherwise, don't send any packets
-                outstandingPacketsToConsumer,
+                outstandingPacketsToConsumer
+        RegisterNewOutstandingPackets(newOutstandingPackets),
         CONSUMER_NOOP,
         // no packets are sent to the provider
         outstandingPacketsToProvider' = outstandingPacketsToProvider,
@@ -339,8 +347,8 @@ module ccv {
         consumerStatus' = consumerStatus,
         // chain times do not change
         curChainTimes' = curChainTimes,
-        // update the packet store on the provider
-        StoreSentPackets,
+        // the validator set was definitely not changed in the new block yet, so set to false
+        providerValidatorSetChangedInThisBlock' = false
     }
 
     action endAndBeginBlockForConsumer(consumer: Chain): bool = all {
@@ -370,13 +378,14 @@ module ccv {
         },
         PROVIDER_NOOP,
         // no packets are sent to consumer or received by it
-        outstandingPacketsToConsumer' = outstandingPacketsToConsumer,
+        RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
         // consumer statusses do not change
         consumerStatus' = consumerStatus,
         // chain times do not change
         curChainTimes' = curChainTimes,
-        // update the packet store on the provider
-        StoreSentPackets,
+        // the validator set was not changed by this action (but might have been changed before in this block)
+        // also, this is only a new block for a consumer, so the change variable shouldn't be reset
+        providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
     }
 
     // advance timestamps for maps nondeterministically
@@ -399,13 +408,13 @@ module ccv {
             votingPowerHistories' = votingPowerHistories,
             runningValidatorSet' = runningValidatorSet,
             outstandingPacketsToProvider' = outstandingPacketsToProvider,
-            outstandingPacketsToConsumer' = outstandingPacketsToConsumer,
+            RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
             receivedMaturations' = receivedMaturations,
             maturationTimes' = maturationTimes,
             // chain times do not change
             consumerStatus' = consumerStatus,
-            // update the packet store on the provider
-            StoreSentPackets,
+            // the validator set was not changed by this action (but might have been changed before in this block)
+            providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
         }
 
     // each consumer chain may advance in the order
@@ -457,20 +466,28 @@ module ccv {
                 }
             ),
             outstandingPacketsToProvider' = outstandingPacketsToProvider,
-            outstandingPacketsToConsumer' = outstandingPacketsToConsumer,
+            RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
             receivedMaturations' = receivedMaturations,
             maturationTimes' = maturationTimes,
             // chain times do not change
             curChainTimes' = curChainTimes,
-            // update the packet store on the provider
-            StoreSentPackets,
+            // the validator set was not changed by this action (but might have been changed before in this block)
+            providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+        }
+
+    // Updates the outstandingPacketsToConsumer and sentVSCPackets variables
+    action RegisterNewOutstandingPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
+        all {
+            outstandingPacketsToConsumer' = newOutstandingPackets,
+            StoreSentPackets(newOutstandingPackets),
         }
 
+
     // stores the VSCPackets sent in this step in sentVSCPackets
-    action StoreSentPackets: bool = 
+    action StoreSentPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
         sentVSCPackets' = sentVSCPackets.keys().mapBy(
             (chain) => 
-            sentVSCPackets.get(chain).union(outstandingPacketsToConsumer.get(chain).toSet())
+            sentVSCPackets.get(chain).union(newOutstandingPackets.get(chain).toSet())
         )
 
     
@@ -534,6 +551,8 @@ module ccv {
         sentVSCPackets' = chains.mapBy(chain => Set()),
         // no packets have been received by consumers, so no maturation times set
         maturationTimes' = chains.mapBy(chain => Map()),
+        // validator set was not changed yet
+        providerValidatorSetChangedInThisBlock' = false
     }
 
     // PROPERTIES
@@ -567,22 +586,27 @@ module ccv {
                 votingPowerChange("B", 10)
             }
         )
-        .then(endAndBeginBlock(ProviderChain))
-        // now the provider should send a packet on block end
-        .then(all {
-            // a packet was sent
-            assert(outstandingPacketsToConsumer.get("chain1").length() == 1),
-            // deliver the packet to the consumer
-            recvPacketOnConsumer("chain1")
-        })
-        .then(all {
-            // the consumer should have the new validator set
-            assert(runningValidatorSet.get("chain1") == runningValidatorSet.get(ProviderChain)),
-            // the old validator set should be in the history
-            assert(votingPowerHistories.get("chain1").head() == Map("A" -> 10)),
-            // put a last action to satisfy the action effect
-            AdvanceConsumers(NoStatusAdvancement)
-        })
+        .then(
+            val valSet = runningValidatorSet.get(ProviderChain)
+            endAndBeginBlock(ProviderChain)
+            // now the provider should send a packet on block end
+            .then(all {
+                // a packet was sent
+                assert(outstandingPacketsToConsumer.get("chain1").length() == 1),
+                // deliver the packet to the consumer
+                recvPacketOnConsumer("chain1")
+            })
+            .then(
+                // consumer needs to end a block before it has the new validator set
+                endAndBeginBlock("chain1")
+            )
+            .then(all {
+                // the consumer should have the new validator set
+                assert(runningValidatorSet.get("chain1") == valSet),
+                // put a last action to satisfy the action effect
+                AdvanceConsumers(NoStatusAdvancement)
+            })
+        )
     }
 
 

From 78e890aef2d319ffaab3347583eda01205315dbb Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <57488781+p-offtermatt@users.noreply.github.com>
Date: Fri, 25 Aug 2023 18:05:24 +0200
Subject: [PATCH 07/80] Add text with what expliticly is modelled

---
 tests/difference/core/quint_model/ccv.qnt | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 131a490d8a..7984d3b01b 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -5,6 +5,11 @@ module ccv {
     // * Reward distribution
     // * Starting/Stopping chains during execution
     // * Slashes
+
+    // Things that explicitly are modelled:
+    // * Validator set changes are propagated from provider to consumers
+    // * VSC packets mature
+    // * Consumers can be forcefully dropped due to timeouts, or stop on their own volition
     
     // TYPE DEFINITIONS
     type Node = str
@@ -610,4 +615,4 @@ module ccv {
     }
 
 
-}
\ No newline at end of file
+}

From a1d57ef47f88dd34c66dd5f61b99073767a7fdd7 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <57488781+p-offtermatt@users.noreply.github.com>
Date: Fri, 25 Aug 2023 20:36:40 +0200
Subject: [PATCH 08/80] Add bluespec to ccv.qnt

---
 tests/difference/core/quint_model/ccv.qnt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 7984d3b01b..d18930ae1d 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -1,3 +1,4 @@
+-*- mode: Bluespec; -*-
 module ccv {
     import extraSpells.* from "./extraSpells"
 

From 6c91866a573bcca553fdfbf00af14d3aac815d48 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <57488781+p-offtermatt@users.noreply.github.com>
Date: Fri, 25 Aug 2023 20:37:05 +0200
Subject: [PATCH 09/80] Add bluespec to expraSpells.qnt

---
 tests/difference/core/quint_model/extraSpells.qnt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/extraSpells.qnt b/tests/difference/core/quint_model/extraSpells.qnt
index a32a74ad8f..a959db5251 100644
--- a/tests/difference/core/quint_model/extraSpells.qnt
+++ b/tests/difference/core/quint_model/extraSpells.qnt
@@ -1,3 +1,4 @@
+-*- mode: Bluespec; -*-
 module extraSpells {
 
   pure def prepend(__list: List[a], __elem: a): List[a] = {
@@ -188,4 +189,4 @@ module extraSpells {
         __set.union(Set(elem))
     }
 
-}
\ No newline at end of file
+}

From 2126eac396d18977b5408e3ee550a20157359dbd Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <57488781+p-offtermatt@users.noreply.github.com>
Date: Tue, 5 Sep 2023 13:03:45 +0200
Subject: [PATCH 10/80] Add docstring to extraSpells module

---
 tests/difference/core/quint_model/extraSpells.qnt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/difference/core/quint_model/extraSpells.qnt b/tests/difference/core/quint_model/extraSpells.qnt
index a959db5251..cd2105beb7 100644
--- a/tests/difference/core/quint_model/extraSpells.qnt
+++ b/tests/difference/core/quint_model/extraSpells.qnt
@@ -1,4 +1,5 @@
 -*- mode: Bluespec; -*-
+// This module is just a library with utility functions (sometimes called spells in Quint).
 module extraSpells {
 
   pure def prepend(__list: List[a], __elem: a): List[a] = {

From 1320b9517982bff596ecfc0ac99755dc75c5f1e1 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Mon, 18 Sep 2023 18:23:31 +0200
Subject: [PATCH 11/80] Start rewriting model

---
 tests/difference/core/quint_model/ccv.qnt     | 1241 +++++++++--------
 .../core/quint_model/extraSpells.qnt          |    1 -
 ...ActionMarshalling-20230912123337-6230.fail |   18 +
 ...ActionMarshalling-20230912123517-6794.fail |   14 +
 ...ActionMarshalling-20230912123556-6970.fail |   14 +
 ...ActionMarshalling-20230912123609-7116.fail |   18 +
 ...ActionMarshalling-20230912123822-8026.fail |    8 +
 ...ctionMarshalling-20230913151826-12656.fail |    8 +
 ...ctionMarshalling-20230913151917-13146.fail |    8 +
 ...eadAndWriteTrace-20230913151920-13146.fail |   11 +
 10 files changed, 790 insertions(+), 551 deletions(-)
 create mode 100644 tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123337-6230.fail
 create mode 100644 tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123517-6794.fail
 create mode 100644 tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123556-6970.fail
 create mode 100644 tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123609-7116.fail
 create mode 100644 tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123822-8026.fail
 create mode 100644 tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151826-12656.fail
 create mode 100644 tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151917-13146.fail
 create mode 100644 tests/e2e/testdata/rapid/TestReadAndWriteTrace/TestReadAndWriteTrace-20230913151920-13146.fail

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index d18930ae1d..4cbc327ac4 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -1,5 +1,4 @@
--*- mode: Bluespec; -*-
-module ccv {
+module ccv_logic {
     import extraSpells.* from "./extraSpells"
 
     // Things that are not modelled:
@@ -12,12 +11,17 @@ module ccv {
     // * VSC packets mature
     // * Consumers can be forcefully dropped due to timeouts, or stop on their own volition
     
+    // ===================
     // TYPE DEFINITIONS
+    // ===================
     type Node = str
     type Chain = str
-    type ValidatorSet = Node -> int
+    type Power = int
+    type ValidatorSet = Node -> Power
     type Height = int
     type Timestamp = int
+    // a list of validator sets per blocks, ordered by recency
+    type VotingPowerHistory = List[ValidatorSet]
 
     // --PACKETS
     type VSCPacket =
@@ -38,582 +42,719 @@ module ccv {
             timeout: Timestamp
         }
     
-    // MODEL PARAMETERS
-        
-
-    // set of identifiers of potential nodes
-    pure val Nodes: Set[Node] = 
-        Set("A", "B", "C", "D", "E", "F", "G", "H", "I", "J")
-
-    // the set of consumer chains
-    pure val ConsumerChains: Set[Chain] = 
-        Set("chain1", "chain2", "chain3")
+    // possible consumer statuses
+    pure val STOPPED = "stopped" // the chain was once a consumer chain, but has been dropped by the provider.
+    pure val RUNNING = "running" // the chain is currently a consumer chain. Running chains are those that get sent VSCPackets.
+    pure val UNUSED = "unused" // the chain has never been a consumer chain, and is available to become one.
+    // When a chain is dropped, it cannot become a consumer again - we assume that would be done by another consumer becoming running.
+
+
+    // state that each chain needs to store, whether consumer or provider.
+    type ChainState = {
+        // Stores the list of voting powers that corresponded to voting powers 
+        // at blocks over the chains entire existence.
+        // Voting powers should be ordered by recency in descending order.
+        votingPowerHistory: VotingPowerHistory,
+
+        // the current validator set on each chain.
+        // this will be included in the next block, but might not be final yet,
+        // e.g. there may be more modifications in the current block.
+        currentValidatorSet: ValidatorSet,
+
+        // the latest timestamp that was comitted on chain
+        lastTimestamp: Timestamp,
+    }
 
-    // The singular provider chain.
-    pure val ProviderChain: Chain = 
-        "provider"
-        
-    pure val chains = ConsumerChains.union(Set(ProviderChain))
-
-    // length of the unbonding period on each chain
-    pure val UnbondingPeriod: Chain -> int = chains.mapBy(
-        (chain) => 
-        10
-    )
-
-    // the time until a packet times out
-    pure val PacketTimeout: int = 
-        5
-
-    // the time until a consumer chain is dropped by the provider due to inactivity
-    pure val InactivityTimeout: int =
-        10
-
-    // consumer statuses
-    pure val STOPPED = "stopped"
-    pure val RUNNING = "running"
-    pure val UNUSED = "unused"
-
-    // utility: a map assigning each chain to 0, used for not advancing timestamps
-    pure val NoTimeAdvancement: Chain -> int = chains.mapBy(
-        (chain) => 
-        0
-    )
-
-    // utility: a struct summarizing the current state
-    val state = 
+    // Defines the current state of the provider chain. Essentially, all information here is stored by the provider on-chain (or could be derived purely by information that is on-chain).
+    type ProviderState =
         {
-            votingPowerHistories: votingPowerHistories,
-            runningValidatorSet: runningValidatorSet,
-            curChainTimes: curChainTimes,
-            consumerStatus: consumerStatus,
-            outstandingPacketsToProvider: outstandingPacketsToProvider,
-            outstandingPacketsToConsumer: outstandingPacketsToConsumer,
-            maturationTimes: maturationTimes,
-            receivedMaturations: receivedMaturations,
-            sentVSCPackets: sentVSCPackets,
-        }
-
-
-    // utility: a map assigning each chain to false, used for not advancing consumer status
-    pure val NoStatusAdvancement: Chain -> bool = chains.mapBy(
-        (chain) => 
-        false
-    )
-
-    // utility: the set of consumers currently running
-    val RunningConsumers: Set[Chain] = 
-        ConsumerChains.filter(chain => consumerStatus.get(chain) == RUNNING)
-
-    // MODEL STATE
-    // --SHARED STATE
-
-    // Stores, for each chain, the list of voting powers that corresponded to voting powers 
-    // at blocks over its entire existence.
-    // Voting powers should be ordered by recency in descending order.
-    var votingPowerHistories: Chain -> List[ValidatorSet]
-
-    // the current validator set on each chain.
-    // this will be included in the next block, but might not be final yet,
-    // e.g. there may be more modifications in the current block.
-    var runningValidatorSet: Chain -> ValidatorSet
-
-    // the current timestamp for each chain
-    var curChainTimes: Chain -> Timestamp
-
-    // stores, for each chain, its current status -
-    // unused, running, or stopped
-    var consumerStatus: Chain -> str
-
-    // --CHANNELS
-    // Stores, for each consumer chain, the list of packets that have been sent to the provider chain
-    // and have not been received yet.
-    var outstandingPacketsToProvider: Chain -> List[VSCMaturedPacket]
+            // the state that each chain needs to store
+            chainState: ChainState,
 
-    // Stores, for each consumer chain, the list of packets that have been sent to the consumer chain
-    // and have not been received yet.
-    var outstandingPacketsToConsumer: Chain -> List[VSCPacket]
+            // Stores, for each consumer chain, the list of packets that have been sent to the consumer chain
+            // and have not been received yet.
+            // In the implementation, this would roughly be the unacknowledged packets on an ibc channel.
+            outstandingPacketsToConsumer: Chain -> List[VSCPacket],
 
+            // the set of received VSCMaturedPackets
+            receivedMaturations: Set[VSCMaturedPacket],
 
-    // --CONSUMER STATE
-    // Stores the maturation times for VSCPackets received by consumers
-    var maturationTimes: Chain -> (VSCPacket -> Timestamp)
+            // stores which VSC Packets have been sent to compare with receivedMaturations to detect timeouts due to non-responsiveness
+            sentVSCPackets: Chain -> Set[VSCPacket],
 
-    // --PROVIDER STATE
-    // the set of VSCMaturedPackets received by the provider chain
-    var receivedMaturations: Set[VSCMaturedPacket]
-
-    // stores which VSC Packets have been sent to compare with receivedMaturations to detect timeouts due to non-responsiveness
-    var sentVSCPackets: Chain -> Set[VSCPacket]
-
-    // stores whether, in this step, the validator set considered to be changed.
-    // this is needed because the validator set might be considered to have changed, even though
-    // it is still technically identical at our level of abstraction, e.g. a validator power change on the provider
-    // might leave the validator set the same because a delegation and undelegation cancel each other out.
-    var providerValidatorSetChangedInThisBlock: bool
-
-
-    // UTILITY FUNCTIONS & ACTIONS
-    def wasValidatorSetOnProvider(validatorSet: ValidatorSet): bool = {
-        votingPowerHistories.get(ProviderChain).toSet().exists(
-            historicalValSet => historicalValSet == validatorSet
-        )
-    }
-
-    def getCurrentValidatorSet(chain: Chain): ValidatorSet = 
-        votingPowerHistories.get(chain).head()
-
-    def getUpdatedValidatorSet(oldValidatorSet: ValidatorSet, validator: Node, newVotingPower: int): ValidatorSet =
-        if (newVotingPower > 0) 
-        oldValidatorSet.put(validator, newVotingPower)
-        else
-        oldValidatorSet.mapRemove(validator)
-
-    // returns true if the consumer has timed out and should be dropped
-    def consumerTimedOut(consumer: Chain): bool =
-        any {
-            // either a package from provider to consumer has timed out
-            outstandingPacketsToConsumer.get(consumer).select(
-                packet => packet.timeout <= curChainTimes.get(consumer)
-            ).length() > 0,
-            // or a package from consumer to provider has timed out
-            outstandingPacketsToProvider.get(consumer).select(
-                packet => packet.timeout <= curChainTimes.get(ProviderChain)
-            ).length() > 0,
-            // or the inactivity timeout has passed since a VSCPacket was sent to the consumer, but the
-            // provider has not received a VSCMaturedPacket for it
-            val packetsWithoutResponse = sentVSCPackets.get(consumer).filter( // get packets without response
-                packet => 
-                not(receivedMaturations.exists(
-                    maturedPacket => maturedPacket.id == packet.id
-                ))
-            )
-            // among those, get packets where inactivity timeout has passed
-            packetsWithoutResponse.filter(
-                packet => 
-                val sentAt = curChainTimes.get(ProviderChain) - PacketTimeout // compute when the packet was sent
-                val timesOutAt = sentAt + InactivityTimeout // compute when the packet times out
-                timesOutAt <= curChainTimes.get(ProviderChain)
-            ).size() > 0
-        }
-
-    // utility action that leaves all provider state untouched
-    action PROVIDER_NOOP(): bool = 
-        all {
-            receivedMaturations' = receivedMaturations,
-        }
+            // stores whether, in this block, the validator set has changed.
+            // this is needed because the validator set might be considered to have changed, even though
+            // it is still technically identical at our level of abstraction, e.g. a validator power change on the provider
+            // might leave the validator set the same because a delegation and undelegation cancel each other out.
+            providerValidatorSetChangedInThisBlock: bool,
 
-    // utility action that leaves all consumer state untouched
-    action CONSUMER_NOOP(): bool = 
-        all {
-            maturationTimes' = maturationTimes,
+            // stores, for each consumer chain, its current status -
+            // unused, running, or stopped
+            consumerStatus: Chain -> str,
         }
-    
 
-    // MODEL ACTIONS
+    // Defines the current state of a consumer chain. This information is accessible to that consumer on-chain.
+    type ConsumerState = {
+        // the state that each chain needs to store
+        chainState: ChainState,
 
-    // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
-    // e.g. via undelegations, or delegations, ...
-    action votingPowerChange(validator: Node, amount: int): bool =
-        // for the provider chain, we need to adjust the voting power history
-        // by adding a new set
-        all {
-            amount >= 0,
-            val newValidatorSet = getCurrentValidatorSet(ProviderChain).getUpdatedValidatorSet(validator, amount)
-            // set the running validator set on the provider chain, but don't update the history yet
-            runningValidatorSet' = runningValidatorSet.set(ProviderChain, newValidatorSet),
-            // no packets are sent yet, these are only sent on endAndBeginBlock
-            RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-            outstandingPacketsToProvider' = outstandingPacketsToProvider,
-            receivedMaturations' = receivedMaturations,
-            CONSUMER_NOOP,
-            // voting power history is only updated on endAndBeginBlock
-            votingPowerHistories' = votingPowerHistories,
-            // consumer statusses do not change
-            consumerStatus' = consumerStatus,
-            // chain times do not change
-            curChainTimes' = curChainTimes,
-            // the validator set is considered to have changed
-            providerValidatorSetChangedInThisBlock' = true,
-        }
+        // Stores the maturation times for VSCPackets received by this consumer
+        maturationTimes: VSCPacket -> Timestamp,
 
-    // deliver the next outstanding packet from the consumer to the provider.
-    // since this model assumes a single provider chain, this just takes a single chain as argument.
-    action recvPacketOnProvider(consumer: Chain): bool = all {
-        // ensure there is a packet to be received
-        outstandingPacketsToProvider.get(consumer).length() > 0,
-        // remove packet from outstanding packets
-        val newPacketQueue = outstandingPacketsToProvider.get(consumer).tail()
-        outstandingPacketsToProvider' = outstandingPacketsToProvider.set(consumer, newPacketQueue),
-        // register the packet as received
-        val maturedPacket = outstandingPacketsToProvider.get(consumer).head()
-        receivedMaturations' = receivedMaturations.add(maturedPacket),
-        CONSUMER_NOOP,
-        RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-        votingPowerHistories' = votingPowerHistories,
-        // no validator set changes are made
-        runningValidatorSet' = runningValidatorSet,
-        // consumer statusses do not change
-        consumerStatus' = consumerStatus,
-        // chain times do not change
-        curChainTimes' = curChainTimes,
-        // the validator set was not changed by this action (but might have been changed before in this block)
-        providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
-    }
+        // Stores the list of packets that have been sent to the provider chain by this consumer
+        // and have not been received yet.
+        // In the implementation, essentially unacknowledged IBC packets.
+        outstandingPacketsToProvider: Chain -> List[VSCMaturedPacket],
 
-    // deliver the next outstanding packet from the provider to the consumer.
-    // since this model assumes a single provider chain, this just takes a single chain as argument.
-    action recvPacketOnConsumer(consumer: Chain): bool = all {
-        // ensure there is a packet to be received
-        outstandingPacketsToConsumer.get(consumer).length() > 0,
-        // remove packet from outstanding packets
-        val newPacketQueue = outstandingPacketsToConsumer.get(consumer).tail()
-        val newOutstandingPackets = outstandingPacketsToConsumer.set(consumer, newPacketQueue)
-        RegisterNewOutstandingPackets(newOutstandingPackets),
-        val packet = outstandingPacketsToConsumer.get(consumer).head()
-        all {
-            // update the running validator set, but not the history yet,
-            // as that only happens when the next block is started
-            runningValidatorSet' = runningValidatorSet.set(consumer, packet.validatorSet),
-            // add the new packet and store its maturation time
-            val newMaturationTimes = maturationTimes.get(consumer).put(packet, curChainTimes.get(consumer) + UnbondingPeriod.get(consumer))
-            maturationTimes' = maturationTimes.set(consumer, newMaturationTimes)
-        },
-        PROVIDER_NOOP,
-        votingPowerHistories' = votingPowerHistories,
-        outstandingPacketsToProvider' = outstandingPacketsToProvider,
-        // consumer statusses do not change
-        consumerStatus' = consumerStatus,
-        // chain times do not change
-        curChainTimes' = curChainTimes,
-        // the validator set was not changed by this action (but might have been changed before in this block)
-        providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+        // Stores the list of voting powers that corresponded to voting powers 
+        // at blocks over the chains entire existence.
+        // Voting powers should be ordered by recency in descending order.
+        votingPowerHistory: VotingPowerHistory,
     }
 
-    // ends the current block and starts the next block for a given chain.
-    action endAndBeginBlock(chain: Chain): bool = any {
-        all {
-          chain == ProviderChain,
-          endAndBeginBlockForProvider,
-        },
-        all {
-            chain != ProviderChain,
-            endAndBeginBlockForConsumer(chain),
-        }
+    // the state of the protocol consists of the composition of the state of one provider chain with potentially many consumer chains.
+    type ProtocolState = {
+        providerState: ProviderState,
+        // the state of each consumer chain.
+        // note that we assume that this contains all consumer chains that may ever exist,
+        // and consumer chains that are currently not running will have providerState.consumerStatus == UNUSED or STOPPED
+        consumerStates: Set[ConsumerState]
     }
 
-    // gets the updated history for the current chain when ending a block, i.e. the
-    // running validator set is added to the history if different from the last one.
-    def getUpdatedHistory(chain: Chain): List[ValidatorSet] =
-        // update voting power history if the validator set changed
-        val newValidatorSet = runningValidatorSet.get(ProviderChain)
-        val oldValidatorSet = votingPowerHistories.get(ProviderChain).head()
-        if (newValidatorSet != oldValidatorSet) 
-            votingPowerHistories.get(ProviderChain).prepend(newValidatorSet)
-        else
-            votingPowerHistories.get(ProviderChain)
-
-
-    action endAndBeginBlockForProvider(): bool = all {
-        // update the voting power history
-        votingPowerHistories' = votingPowerHistories.set(ProviderChain, getUpdatedHistory(ProviderChain)),
-        // the running validator set is now for sure the current validator set,
-        // so start with it in the next block
-        runningValidatorSet' = runningValidatorSet,
-        // send VSCPackets to consumers
-        val newOutstandingPackets = 
-            // if running validator set is considered to have changed
-            if (providerValidatorSetChangedInThisBlock)
-                // then send a packet to each running consumer
-                outstandingPacketsToConsumer.keys().mapBy(
-                    (consumer) => 
-                    val packetQueue = outstandingPacketsToConsumer.get(consumer)
-                    if (consumerStatus.get(consumer) == RUNNING) {
-                        packetQueue.append(
-                            {
-                                id: packetQueue.length(),
-                                validatorSet: runningValidatorSet.get(ProviderChain),
-                                timeout: curChainTimes.get(ProviderChain) + PacketTimeout
-                            }
-                        )
-                    } else {
-                        packetQueue
-                    }
-                )
-            else
-                // otherwise, don't send any packets
-                outstandingPacketsToConsumer
-        RegisterNewOutstandingPackets(newOutstandingPackets),
-        CONSUMER_NOOP,
-        // no packets are sent to the provider
-        outstandingPacketsToProvider' = outstandingPacketsToProvider,
-        // do not receive any maturations
-        receivedMaturations' = receivedMaturations,
-        // consumer statusses do not change
-        consumerStatus' = consumerStatus,
-        // chain times do not change
-        curChainTimes' = curChainTimes,
-        // the validator set was definitely not changed in the new block yet, so set to false
-        providerValidatorSetChangedInThisBlock' = false
+    type Error = {
+        message: str
     }
 
-    action endAndBeginBlockForConsumer(consumer: Chain): bool = all {
-        ConsumerChains.contains(consumer),
-        // update the voting power history
-        votingPowerHistories' = votingPowerHistories.set(consumer, getUpdatedHistory(consumer)),
-        // the running validator set is now for sure the current validator set,
-        // so start with it in the next block
-        runningValidatorSet' = runningValidatorSet,
-        // compute mature packets whose maturation time has passed
-        val maturedPackets = maturationTimes.get(consumer).keys().filter(
-            packet => 
-            val maturationTime = maturationTimes.get(consumer).get(packet)
-            maturationTime <= curChainTimes.get(consumer)
-        )
-        all {
-            // remove matured packets from the maturation times
-            maturationTimes' = maturationTimes.set(consumer, maturationTimes.get(consumer).mapRemoveAll(maturedPackets)),
-            // send matured packets
-            outstandingPacketsToProvider' = outstandingPacketsToProvider.set(
-                consumer, 
-                // construct VSCMaturedPackets from the matured VSCPackets
-                outstandingPacketsToProvider.get(consumer).concat(
-                    maturedPackets.map(packet => {id: packet.id, timeout: 5}).toList()
-                )
-            )
-        },
-        PROVIDER_NOOP,
-        // no packets are sent to consumer or received by it
-        RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-        // consumer statusses do not change
-        consumerStatus' = consumerStatus,
-        // chain times do not change
-        curChainTimes' = curChainTimes,
-        // the validator set was not changed by this action (but might have been changed before in this block)
-        // also, this is only a new block for a consumer, so the change variable shouldn't be reset
-        providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+    // we return either a result or an error.
+    // if hasError is true, newState may be arbitrary, but the error will be meaningful.
+    // if hasError is false, error may be arbitrary, but newState will be meaningful.
+    type Result = {
+        hasError: bool,
+        newState: ProtocolState,
+        error: Error
     }
 
-    // advance timestamps for maps nondeterministically
-    action AdvanceTime(): bool = 
-            val advanceAmounts = curChainTimes.keys().mapBy(
-                chain =>    
-                nondet amount = oneOf(1.to(10))
-                amount
-            )
-            AdvanceTimeByMap(advanceAmounts)
-
-    // the timestamp for each chain is advanced by the given amount
-    action AdvanceTimeByMap(advancementAmount: Chain -> int): bool = all
+    pure def Ok(newState: ProtocolState): Result = {
         {
-            curChainTimes' = curChainTimes.keys().mapBy(
-                chain => 
-                curChainTimes.get(chain) + advancementAmount.get(chain)
-            ),
-            // all other variables are left untouched
-            votingPowerHistories' = votingPowerHistories,
-            runningValidatorSet' = runningValidatorSet,
-            outstandingPacketsToProvider' = outstandingPacketsToProvider,
-            RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-            receivedMaturations' = receivedMaturations,
-            maturationTimes' = maturationTimes,
-            // chain times do not change
-            consumerStatus' = consumerStatus,
-            // the validator set was not changed by this action (but might have been changed before in this block)
-            providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
-        }
-
-    // each consumer chain may advance in the order
-    // some events may necessitate a transition, e.g. timeouts.
-    // shouldAdvance gives, for each consumer chain, whether it should advance if possible.
-    // if a chain has to advance, e.g. due to timeouts, or may not advance, the value will have no effect.
-    action AdvanceConsumers(shouldAdvance: Chain -> bool): bool = 
-        val newConsumerStatus = consumerStatus.keys().mapBy(
-            chain => 
-            val curStatus = consumerStatus.get(chain)
-            if (curStatus == UNUSED) {
-                if (shouldAdvance.get(chain))
-                {
-                    RUNNING
-                } else {
-                    UNUSED
-                }
-            }
-            else if (curStatus == RUNNING) {
-                // the chain may transition to stopped.
-                // it is *forced* to stop if a packet timed out,
-                // or if the inactivity timeout has passed
-                if(consumerTimedOut(chain)) {
-                    STOPPED
-                } else {
-                    if (shouldAdvance.get(chain)) {
-                        RUNNING
-                    } else {
-                        STOPPED
-                    }
-                }
-            } else {
-                // stopped chains cannot restart, we assume a new chain would be started in that case
-                STOPPED
+            hasError: false,
+            newState: newState,
+            error: {
+                message: ""
             }
-            )
-        all {
-            consumerStatus' = newConsumerStatus,
-            // all other variables are left untouched
-            votingPowerHistories' = votingPowerHistories,
-            runningValidatorSet' = runningValidatorSet.keys().mapBy(
-                chain => 
-                if (newConsumerStatus.get(chain) == RUNNING and consumerStatus.get(chain) == UNUSED) 
-                // consumers that went from unused to running start with the current validator set on the provider
-                { 
-                    runningValidatorSet.get(ProviderChain) 
-                } else {
-                    runningValidatorSet.get(chain)
-                }
-            ),
-            outstandingPacketsToProvider' = outstandingPacketsToProvider,
-            RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-            receivedMaturations' = receivedMaturations,
-            maturationTimes' = maturationTimes,
-            // chain times do not change
-            curChainTimes' = curChainTimes,
-            // the validator set was not changed by this action (but might have been changed before in this block)
-            providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
         }
+    }
 
-    // Updates the outstandingPacketsToConsumer and sentVSCPackets variables
-    action RegisterNewOutstandingPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
-        all {
-            outstandingPacketsToConsumer' = newOutstandingPackets,
-            StoreSentPackets(newOutstandingPackets),
+    pure def Err(msg: str): Result = {
+        {
+            hasError: true,
+            newState: {
+                providerState: {
+                    chainState: {
+                        votingPowerHistory: List(),
+                        currentValidatorSet: Map(),
+                        lastTimestamp: 0
+                    },
+                    outstandingPacketsToConsumer: Map(),
+                    receivedMaturations: Set(),
+                    sentVSCPackets: Map(),
+                    providerValidatorSetChangedInThisBlock: false,
+                    consumerStatus: Map()
+                },
+                consumerStates: Set()
+            },
+            error: {
+                message: msg
+            }
         }
+    }
 
+    // ===================
+    // PROTOCOL LOGIC
+    // ===================
 
-    // stores the VSCPackets sent in this step in sentVSCPackets
-    action StoreSentPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
-        sentVSCPackets' = sentVSCPackets.keys().mapBy(
-            (chain) => 
-            sentVSCPackets.get(chain).union(newOutstandingPackets.get(chain).toSet())
-        )
-
+    pure def getUpdatedValidatorSet(oldValidatorSet: ValidatorSet, validator: Node, newVotingPower: int): ValidatorSet =
+        if (newVotingPower > 0) 
+        oldValidatorSet.put(validator, newVotingPower)
+        else
+        oldValidatorSet.mapRemove(validator)
     
-    // the main step action 
-    action step: bool = any {
-        AdvanceTime,
-        nondet node = oneOf(Nodes)
-        nondet amount = oneOf(1.to(10))
-        votingPowerChange(node, amount),
-        recvPacketOnProvider(oneOf(ConsumerChains)),
-        recvPacketOnConsumer(oneOf(ConsumerChains)),
-        nondet chain = oneOf(chains)
-        endAndBeginBlock(chain),
-        val shouldAdvance = ConsumerChains.mapBy(
-            chain => 
-            nondet should = oneOf(Set(true, false))
-            should
-        )
-        AdvanceConsumers(shouldAdvance),
-    }
-
-    pure val nodePowerSet = Nodes.powerset()
-
-    def getArbitraryValidatorSet(): ValidatorSet = 
-        nondet numValidators = oneOf(1.to(Nodes.size()))
-        // toList has nondeterministic behaviour, so this gets arbitrary validators
-        nondet validators = oneOf(nodePowerSet.filter(s => s.size() == numValidators))
-        validators.mapBy(
-            validator => 
-            nondet votingPower = oneOf(1.to(10))
-            votingPower
-        )
-
-    // INITIALIZATION
-    action init: bool = 
-    all {
-        val validatorSets = chains.mapBy(
-            (chain) => 
-        // provider chain gets an arbitrary validator set, consumer chains have none
-            if (chain == ProviderChain) getArbitraryValidatorSet else Map()
-        )
-        all {
-            votingPowerHistories' = chains.mapBy(
-                (chain) => 
-                List(validatorSets.get(chain))
-            ),
-            runningValidatorSet' = validatorSets,
-        },
-        // each chain starts at time 0
-        curChainTimes' = chains.mapBy(
-            (chain) => 0
-        ),
-        // all consumer chains are unused
-        consumerStatus' = chains.mapBy(chain => UNUSED),
-        // no packets are outstanding
-        outstandingPacketsToProvider' = chains.mapBy(chain => List()),
-        outstandingPacketsToConsumer' = chains.mapBy(chain => List()),
-        // no maturations have been received by provider
-        receivedMaturations' = Set(),
-        // no packets have been sent to consumers
-        sentVSCPackets' = chains.mapBy(chain => Set()),
-        // no packets have been received by consumers, so no maturation times set
-        maturationTimes' = chains.mapBy(chain => Map()),
-        // validator set was not changed yet
-        providerValidatorSetChangedInThisBlock' = false
-    }
+    // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
+    // e.g. via undelegations, or delegations, ...
+    pure def votingPowerChange(currentState: ProtocolState, validator: Node, amount: int): Result =
+            // adjust the current validator set on the provider - it is not entered in the voting history yet because that happens only on block end
+            val currentValidatorSet = currentState.providerState.currentValidatorSet
+            // val newValidatorSet = getUpdatedValidatorSet(currentValidatorSet, validator, amount)
+            // val newProviderState = currentState.providerState.with(
+            //     "currentValidatorSet", newValidatorSet
+            // )
+            // val newState = currentState.with(
+            //     "providerState", newProviderState
+            // )
+            Err("not implemented")
+}
 
-    // PROPERTIES
-
-    // Every validator set on any consumer chain MUST either be or
-    // have been a validator set on the provider chain.
-    val ValidatorSetReplication: bool = 
-        chains.forall(
-            chain => chain.getCurrentValidatorSet().wasValidatorSetOnProvider()
-        )
-
-    // TESTS
-    run VSCHappyPathTest: bool = {
-        init
-        // trigger a votingPowerChange on the provider chain
-        .then(votingPowerChange("A", 10))
-        // endAndBeginBlock on provider. No consumer chains are running, so no packets are sent
-        .then(endAndBeginBlock(ProviderChain))
-        .then(all {
-            // no packet was sent
-            assert(outstandingPacketsToConsumer.get("chain1").length() == 0),
-            // advance chain1 to running
-            AdvanceConsumers(NoStatusAdvancement.set("chain1", true))
-        })
-        // consumer chain should have current validator set from provider
-        .then(
-            all { 
-                // since consumer chain just started, its assumed to have the validator set from provider
-                assert(runningValidatorSet.get("chain1") == runningValidatorSet.get(ProviderChain)),
-                // trigger a votingPowerChange on the provider chain
-                votingPowerChange("B", 10)
-            }
-        )
-        .then(
-            val valSet = runningValidatorSet.get(ProviderChain)
-            endAndBeginBlock(ProviderChain)
-            // now the provider should send a packet on block end
-            .then(all {
-                // a packet was sent
-                assert(outstandingPacketsToConsumer.get("chain1").length() == 1),
-                // deliver the packet to the consumer
-                recvPacketOnConsumer("chain1")
-            })
-            .then(
-                // consumer needs to end a block before it has the new validator set
-                endAndBeginBlock("chain1")
-            )
-            .then(all {
-                // the consumer should have the new validator set
-                assert(runningValidatorSet.get("chain1") == valSet),
-                // put a last action to satisfy the action effect
-                AdvanceConsumers(NoStatusAdvancement)
-            })
-        )
-    }
+module ccv_tests {
+    import ccv_logic.*
+
+    // // UTILITY FUNCTIONS & ACTIONS
+    // def wasValidatorSetOnProvider(validatorSet: ValidatorSet): bool = {
+    //     votingPowerHistories.get(ProviderChain).toSet().exists(
+    //         historicalValSet => historicalValSet == validatorSet
+    //     )
+    // }
+
+    // def getCurrentValidatorSet(chain: Chain): ValidatorSet = 
+    //     votingPowerHistories.get(chain).head()
+
+    // // returns true if the consumer has timed out and should be dropped
+    // def consumerTimedOut(consumer: Chain): bool =
+    //     any {
+    //         // either a package from provider to consumer has timed out
+    //         outstandingPacketsToConsumer.get(consumer).select(
+    //             packet => packet.timeout <= curChainTimes.get(consumer)
+    //         ).length() > 0,
+    //         // or a package from consumer to provider has timed out
+    //         outstandingPacketsToProvider.get(consumer).select(
+    //             packet => packet.timeout <= curChainTimes.get(ProviderChain)
+    //         ).length() > 0,
+    //         // or the inactivity timeout has passed since a VSCPacket was sent to the consumer, but the
+    //         // provider has not received a VSCMaturedPacket for it
+    //         val packetsWithoutResponse = sentVSCPackets.get(consumer).filter( // get packets without response
+    //             packet => 
+    //             not(receivedMaturations.exists(
+    //                 maturedPacket => maturedPacket.id == packet.id
+    //             ))
+    //         )
+    //         // among those, get packets where inactivity timeout has passed
+    //         packetsWithoutResponse.filter(
+    //             packet => 
+    //             val sentAt = curChainTimes.get(ProviderChain) - PacketTimeout // compute when the packet was sent
+    //             val timesOutAt = sentAt + InactivityTimeout // compute when the packet times out
+    //             timesOutAt <= curChainTimes.get(ProviderChain)
+    //         ).size() > 0
+    //     }
+
+    // // utility action that leaves all provider state untouched
+    // action PROVIDER_NOOP(): bool = 
+    //     all {
+    //         receivedMaturations' = receivedMaturations,
+    //     }
+
+    // // utility action that leaves all consumer state untouched
+    // action CONSUMER_NOOP(): bool = 
+    //     all {
+    //         maturationTimes' = maturationTimes,
+    //     }
+    
 
+    // // MODEL ACTIONS
+
+    // // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
+    // // e.g. via undelegations, or delegations, ...
+    // action doVotingPowerChange(validator: Node, amount: int): bool =
+    //     // for the provider chain, we need to adjust the voting power history
+    //     // by adding a new set
+    //     all {
+    //         amount >= 0,
+    //         val newValidatorSet = getCurrentValidatorSet(ProviderChain).getUpdatedValidatorSet(validator, amount)
+    //         // set the running validator set on the provider chain, but don't update the history yet
+    //         runningValidatorSet' = runningValidatorSet.set(ProviderChain, newValidatorSet),
+    //         // no packets are sent yet, these are only sent on endAndBeginBlock
+    //         RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
+    //         outstandingPacketsToProvider' = outstandingPacketsToProvider,
+    //         receivedMaturations' = receivedMaturations,
+    //         CONSUMER_NOOP,
+    //         // voting power history is only updated on endAndBeginBlock
+    //         votingPowerHistories' = votingPowerHistories,
+    //         // consumer statusses do not change
+    //         consumerStatus' = consumerStatus,
+    //         // chain times do not change
+    //         curChainTimes' = curChainTimes,
+    //         // the validator set is considered to have changed
+    //         providerValidatorSetChangedInThisBlock' = true,
+    //     }
+
+    // // deliver the next outstanding packet from the consumer to the provider.
+    // // since this model assumes a single provider chain, this just takes a single chain as argument.
+    // action recvPacketOnProvider(consumer: Chain): bool = all {
+    //     // ensure there is a packet to be received
+    //     outstandingPacketsToProvider.get(consumer).length() > 0,
+    //     // remove packet from outstanding packets
+    //     val newPacketQueue = outstandingPacketsToProvider.get(consumer).tail()
+    //     outstandingPacketsToProvider' = outstandingPacketsToProvider.set(consumer, newPacketQueue),
+    //     // register the packet as received
+    //     val maturedPacket = outstandingPacketsToProvider.get(consumer).head()
+    //     receivedMaturations' = receivedMaturations.add(maturedPacket),
+    //     CONSUMER_NOOP,
+    //     RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
+    //     votingPowerHistories' = votingPowerHistories,
+    //     // no validator set changes are made
+    //     runningValidatorSet' = runningValidatorSet,
+    //     // consumer statusses do not change
+    //     consumerStatus' = consumerStatus,
+    //     // chain times do not change
+    //     curChainTimes' = curChainTimes,
+    //     // the validator set was not changed by this action (but might have been changed before in this block)
+    //     providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+    // }
+
+    // // deliver the next outstanding packet from the provider to the consumer.
+    // // since this model assumes a single provider chain, this just takes a single chain as argument.
+    // action recvPacketOnConsumer(consumer: Chain): bool = all {
+    //     // ensure there is a packet to be received
+    //     outstandingPacketsToConsumer.get(consumer).length() > 0,
+    //     // remove packet from outstanding packets
+    //     val newPacketQueue = outstandingPacketsToConsumer.get(consumer).tail()
+    //     val newOutstandingPackets = outstandingPacketsToConsumer.set(consumer, newPacketQueue)
+    //     RegisterNewOutstandingPackets(newOutstandingPackets),
+    //     val packet = outstandingPacketsToConsumer.get(consumer).head()
+    //     all {
+    //         // update the running validator set, but not the history yet,
+    //         // as that only happens when the next block is started
+    //         runningValidatorSet' = runningValidatorSet.set(consumer, packet.validatorSet),
+    //         // add the new packet and store its maturation time
+    //         val newMaturationTimes = maturationTimes.get(consumer).put(packet, curChainTimes.get(consumer) + UnbondingPeriod.get(consumer))
+    //         maturationTimes' = maturationTimes.set(consumer, newMaturationTimes)
+    //     },
+    //     PROVIDER_NOOP,
+    //     votingPowerHistories' = votingPowerHistories,
+    //     outstandingPacketsToProvider' = outstandingPacketsToProvider,
+    //     // consumer statusses do not change
+    //     consumerStatus' = consumerStatus,
+    //     // chain times do not change
+    //     curChainTimes' = curChainTimes,
+    //     // the validator set was not changed by this action (but might have been changed before in this block)
+    //     providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+    // }
+
+    // // ends the current block and starts the next block for a given chain.
+    // action endAndBeginBlock(chain: Chain): bool = any {
+    //     all {
+    //       chain == ProviderChain,
+    //       endAndBeginBlockForProvider,
+    //     },
+    //     all {
+    //         chain != ProviderChain,
+    //         endAndBeginBlockForConsumer(chain),
+    //     }
+    // }
+
+    // // gets the updated history for the current chain when ending a block, i.e. the
+    // // running validator set is added to the history if different from the last one.
+    // def getUpdatedHistory(chain: Chain): List[ValidatorSet] =
+    //     // update voting power history if the validator set changed
+    //     val newValidatorSet = runningValidatorSet.get(ProviderChain)
+    //     val oldValidatorSet = votingPowerHistories.get(ProviderChain).head()
+    //     if (newValidatorSet != oldValidatorSet) 
+    //         votingPowerHistories.get(ProviderChain).prepend(newValidatorSet)
+    //     else
+    //         votingPowerHistories.get(ProviderChain)
+
+
+    // action endAndBeginBlockForProvider(): bool = all {
+    //     // update the voting power history
+    //     votingPowerHistories' = votingPowerHistories.set(ProviderChain, getUpdatedHistory(ProviderChain)),
+    //     // the running validator set is now for sure the current validator set,
+    //     // so start with it in the next block
+    //     runningValidatorSet' = runningValidatorSet,
+    //     // send VSCPackets to consumers
+    //     val newOutstandingPackets = 
+    //         // if running validator set is considered to have changed
+    //         if (providerValidatorSetChangedInThisBlock)
+    //             // then send a packet to each running consumer
+    //             outstandingPacketsToConsumer.keys().mapBy(
+    //                 (consumer) => 
+    //                 val packetQueue = outstandingPacketsToConsumer.get(consumer)
+    //                 if (consumerStatus.get(consumer) == RUNNING) {
+    //                     packetQueue.append(
+    //                         {
+    //                             id: packetQueue.length(),
+    //                             validatorSet: runningValidatorSet.get(ProviderChain),
+    //                             timeout: curChainTimes.get(ProviderChain) + PacketTimeout
+    //                         }
+    //                     )
+    //                 } else {
+    //                     packetQueue
+    //                 }
+    //             )
+    //         else
+    //             // otherwise, don't send any packets
+    //             outstandingPacketsToConsumer
+    //     RegisterNewOutstandingPackets(newOutstandingPackets),
+    //     CONSUMER_NOOP,
+    //     // no packets are sent to the provider
+    //     outstandingPacketsToProvider' = outstandingPacketsToProvider,
+    //     // do not receive any maturations
+    //     receivedMaturations' = receivedMaturations,
+    //     // consumer statusses do not change
+    //     consumerStatus' = consumerStatus,
+    //     // chain times do not change
+    //     curChainTimes' = curChainTimes,
+    //     // the validator set was definitely not changed in the new block yet, so set to false
+    //     providerValidatorSetChangedInThisBlock' = false
+    // }
+
+    // action endAndBeginBlockForConsumer(consumer: Chain): bool = all {
+    //     ConsumerChains.contains(consumer),
+    //     // update the voting power history
+    //     votingPowerHistories' = votingPowerHistories.set(consumer, getUpdatedHistory(consumer)),
+    //     // the running validator set is now for sure the current validator set,
+    //     // so start with it in the next block
+    //     runningValidatorSet' = runningValidatorSet,
+    //     // compute mature packets whose maturation time has passed
+    //     val maturedPackets = maturationTimes.get(consumer).keys().filter(
+    //         packet => 
+    //         val maturationTime = maturationTimes.get(consumer).get(packet)
+    //         maturationTime <= curChainTimes.get(consumer)
+    //     )
+    //     all {
+    //         // remove matured packets from the maturation times
+    //         maturationTimes' = maturationTimes.set(consumer, maturationTimes.get(consumer).mapRemoveAll(maturedPackets)),
+    //         // send matured packets
+    //         outstandingPacketsToProvider' = outstandingPacketsToProvider.set(
+    //             consumer, 
+    //             // construct VSCMaturedPackets from the matured VSCPackets
+    //             outstandingPacketsToProvider.get(consumer).concat(
+    //                 maturedPackets.map(packet => {id: packet.id, timeout: 5}).toList()
+    //             )
+    //         )
+    //     },
+    //     PROVIDER_NOOP,
+    //     // no packets are sent to consumer or received by it
+    //     RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
+    //     // consumer statusses do not change
+    //     consumerStatus' = consumerStatus,
+    //     // chain times do not change
+    //     curChainTimes' = curChainTimes,
+    //     // the validator set was not changed by this action (but might have been changed before in this block)
+    //     // also, this is only a new block for a consumer, so the change variable shouldn't be reset
+    //     providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+    // }
+
+    // // advance timestamps for maps nondeterministically
+    // action AdvanceTime(): bool = 
+    //         val advanceAmounts = curChainTimes.keys().mapBy(
+    //             chain =>    
+    //             nondet amount = oneOf(1.to(10))
+    //             amount
+    //         )
+    //         AdvanceTimeByMap(advanceAmounts)
+
+    // // the timestamp for each chain is advanced by the given amount
+    // action AdvanceTimeByMap(advancementAmount: Chain -> int): bool = all
+    //     {
+    //         curChainTimes' = curChainTimes.keys().mapBy(
+    //             chain => 
+    //             curChainTimes.get(chain) + advancementAmount.get(chain)
+    //         ),
+    //         // all other variables are left untouched
+    //         votingPowerHistories' = votingPowerHistories,
+    //         runningValidatorSet' = runningValidatorSet,
+    //         outstandingPacketsToProvider' = outstandingPacketsToProvider,
+    //         RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
+    //         receivedMaturations' = receivedMaturations,
+    //         maturationTimes' = maturationTimes,
+    //         // chain times do not change
+    //         consumerStatus' = consumerStatus,
+    //         // the validator set was not changed by this action (but might have been changed before in this block)
+    //         providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+    //     }
+
+    // // each consumer chain may advance in the order
+    // // some events may necessitate a transition, e.g. timeouts.
+    // // shouldAdvance gives, for each consumer chain, whether it should advance if possible.
+    // // if a chain has to advance, e.g. due to timeouts, or may not advance, the value will have no effect.
+    // action AdvanceConsumers(shouldAdvance: Chain -> bool): bool = 
+    //     val newConsumerStatus = consumerStatus.keys().mapBy(
+    //         chain => 
+    //         val curStatus = consumerStatus.get(chain)
+    //         if (curStatus == UNUSED) {
+    //             if (shouldAdvance.get(chain))
+    //             {
+    //                 RUNNING
+    //             } else {
+    //                 UNUSED
+    //             }
+    //         }
+    //         else if (curStatus == RUNNING) {
+    //             // the chain may transition to stopped.
+    //             // it is *forced* to stop if a packet timed out,
+    //             // or if the inactivity timeout has passed
+    //             if(consumerTimedOut(chain)) {
+    //                 STOPPED
+    //             } else {
+    //                 if (shouldAdvance.get(chain)) {
+    //                     RUNNING
+    //                 } else {
+    //                     STOPPED
+    //                 }
+    //             }
+    //         } else {
+    //             // stopped chains cannot restart, we assume a new chain would be started in that case
+    //             STOPPED
+    //         }
+    //         )
+    //     all {
+    //         consumerStatus' = newConsumerStatus,
+    //         // all other variables are left untouched
+    //         votingPowerHistories' = votingPowerHistories,
+    //         runningValidatorSet' = runningValidatorSet.keys().mapBy(
+    //             chain => 
+    //             if (newConsumerStatus.get(chain) == RUNNING and consumerStatus.get(chain) == UNUSED) 
+    //             // consumers that went from unused to running start with the current validator set on the provider
+    //             { 
+    //                 runningValidatorSet.get(ProviderChain) 
+    //             } else {
+    //                 runningValidatorSet.get(chain)
+    //             }
+    //         ),
+    //         outstandingPacketsToProvider' = outstandingPacketsToProvider,
+    //         RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
+    //         receivedMaturations' = receivedMaturations,
+    //         maturationTimes' = maturationTimes,
+    //         // chain times do not change
+    //         curChainTimes' = curChainTimes,
+    //         // the validator set was not changed by this action (but might have been changed before in this block)
+    //         providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+    //     }
+
+    // // Updates the outstandingPacketsToConsumer and sentVSCPackets variables
+    // action RegisterNewOutstandingPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
+    //     all {
+    //         outstandingPacketsToConsumer' = newOutstandingPackets,
+    //         StoreSentPackets(newOutstandingPackets),
+    //     }
+
+
+    // // stores the VSCPackets sent in this step in sentVSCPackets
+    // action StoreSentPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
+    //     sentVSCPackets' = sentVSCPackets.keys().mapBy(
+    //         (chain) => 
+    //         sentVSCPackets.get(chain).union(newOutstandingPackets.get(chain).toSet())
+    //     )
 
+    
+    // // the main step action 
+    // action step: bool = any {
+    //     AdvanceTime,
+    //     nondet node = oneOf(Nodes)
+    //     nondet amount = oneOf(1.to(10))
+    //     votingPowerChange(node, amount),
+    //     recvPacketOnProvider(oneOf(ConsumerChains)),
+    //     recvPacketOnConsumer(oneOf(ConsumerChains)),
+    //     nondet chain = oneOf(chains)
+    //     endAndBeginBlock(chain),
+    //     val shouldAdvance = ConsumerChains.mapBy(
+    //         chain => 
+    //         nondet should = oneOf(Set(true, false))
+    //         should
+    //     )
+    //     AdvanceConsumers(shouldAdvance),
+    // }
+
+    // pure val nodePowerSet = Nodes.powerset()
+
+    // def getArbitraryValidatorSet(): ValidatorSet = 
+    //     nondet numValidators = oneOf(1.to(Nodes.size()))
+    //     // toList has nondeterministic behaviour, so this gets arbitrary validators
+    //     nondet validators = oneOf(nodePowerSet.filter(s => s.size() == numValidators))
+    //     validators.mapBy(
+    //         validator => 
+    //         nondet votingPower = oneOf(1.to(10))
+    //         votingPower
+    //     )
+
+    // // INITIALIZATION
+    // action init: bool = 
+    // all {
+    //     val validatorSets = chains.mapBy(
+    //         (chain) => 
+    //     // provider chain gets an arbitrary validator set, consumer chains have none
+    //         if (chain == ProviderChain) getArbitraryValidatorSet else Map()
+    //     )
+    //     all {
+    //         votingPowerHistories' = chains.mapBy(
+    //             (chain) => 
+    //             List(validatorSets.get(chain))
+    //         ),
+    //         runningValidatorSet' = validatorSets,
+    //     },
+    //     // each chain starts at time 0
+    //     curChainTimes' = chains.mapBy(
+    //         (chain) => 0
+    //     ),
+    //     // all consumer chains are unused
+    //     consumerStatus' = chains.mapBy(chain => UNUSED),
+    //     // no packets are outstanding
+    //     outstandingPacketsToProvider' = chains.mapBy(chain => List()),
+    //     outstandingPacketsToConsumer' = chains.mapBy(chain => List()),
+    //     // no maturations have been received by provider
+    //     receivedMaturations' = Set(),
+    //     // no packets have been sent to consumers
+    //     sentVSCPackets' = chains.mapBy(chain => Set()),
+    //     // no packets have been received by consumers, so no maturation times set
+    //     maturationTimes' = chains.mapBy(chain => Map()),
+    //     // validator set was not changed yet
+    //     providerValidatorSetChangedInThisBlock' = false
+    // }
+
+    // // PROPERTIES
+
+    // // Every validator set on any consumer chain MUST either be or
+    // // have been a validator set on the provider chain.
+    // val ValidatorSetReplication: bool = 
+    //     chains.forall(
+    //         chain => chain.getCurrentValidatorSet().wasValidatorSetOnProvider()
+    //     )
+
+    // // TESTS
+    // run VSCHappyPathTest: bool = {
+    //     init
+    //     // trigger a votingPowerChange on the provider chain
+    //     .then(votingPowerChange("A", 10))
+    //     // endAndBeginBlock on provider. No consumer chains are running, so no packets are sent
+    //     .then(endAndBeginBlock(ProviderChain))
+    //     .then(all {
+    //         // no packet was sent
+    //         assert(outstandingPacketsToConsumer.get("chain1").length() == 0),
+    //         // advance chain1 to running
+    //         AdvanceConsumers(NoStatusAdvancement.set("chain1", true))
+    //     })
+    //     // consumer chain should have current validator set from provider
+    //     .then(
+    //         all { 
+    //             // since consumer chain just started, its assumed to have the validator set from provider
+    //             assert(runningValidatorSet.get("chain1") == runningValidatorSet.get(ProviderChain)),
+    //             // trigger a votingPowerChange on the provider chain
+    //             votingPowerChange("B", 10)
+    //         }
+    //     )
+    //     .then(
+    //         val valSet = runningValidatorSet.get(ProviderChain)
+    //         endAndBeginBlock(ProviderChain)
+    //         // now the provider should send a packet on block end
+    //         .then(all {
+    //             // a packet was sent
+    //             assert(outstandingPacketsToConsumer.get("chain1").length() == 1),
+    //             // deliver the packet to the consumer
+    //             recvPacketOnConsumer("chain1")
+    //         })
+    //         .then(
+    //             // consumer needs to end a block before it has the new validator set
+    //             endAndBeginBlock("chain1")
+    //         )
+    //         .then(all {
+    //             // the consumer should have the new validator set
+    //             assert(runningValidatorSet.get("chain1") == valSet),
+    //             // put a last action to satisfy the action effect
+    //             AdvanceConsumers(NoStatusAdvancement)
+    //         })
+    //     )
+    // }
+
+    // // utility: the set of consumers currently running
+    // val RunningConsumers: Set[Chain] = 
+    //     ConsumerChains.filter(chain => consumerStatus.get(chain) == RUNNING)
+
+    // // MODEL STATE
+    // // --SHARED STATE
+
+    // // Stores, for each chain, the list of voting powers that corresponded to voting powers 
+    // // at blocks over its entire existence.
+    // // Voting powers should be ordered by recency in descending order.
+    // var votingPowerHistories: Chain -> List[ValidatorSet]
+
+    // // the current validator set on each chain.
+    // // this will be included in the next block, but might not be final yet,
+    // // e.g. there may be more modifications in the current block.
+    // var runningValidatorSet: Chain -> ValidatorSet
+
+    // // the current timestamp for each chain
+    // var curChainTimes: Chain -> Timestamp
+
+    // // stores, for each chain, its current status -
+    // // unused, running, or stopped
+    // var consumerStatus: Chain -> str
+
+    // // --CHANNELS
+    // // Stores, for each consumer chain, the list of packets that have been sent to the provider chain
+    // // and have not been received yet.
+    // var outstandingPacketsToProvider: Chain -> List[VSCMaturedPacket]
+
+    // // Stores, for each consumer chain, the list of packets that have been sent to the consumer chain
+    // // and have not been received yet.
+    // var outstandingPacketsToConsumer: Chain -> List[VSCPacket]
+
+
+    // // --CONSUMER STATE
+    // // Stores the maturation times for VSCPackets received by consumers
+    // var maturationTimes: Chain -> (VSCPacket -> Timestamp)
+
+    // // --PROVIDER STATE
+    // // the set of VSCMaturedPackets received by the provider chain
+    // var receivedMaturations: Set[VSCMaturedPacket]
+
+    // // stores which VSC Packets have been sent to compare with receivedMaturations to detect timeouts due to non-responsiveness
+    // var sentVSCPackets: Chain -> Set[VSCPacket]
+
+    // // stores whether, in this step, the validator set considered to be changed.
+    // // this is needed because the validator set might be considered to have changed, even though
+    // // it is still technically identical at our level of abstraction, e.g. a validator power change on the provider
+    // // might leave the validator set the same because a delegation and undelegation cancel each other out.
+    // var providerValidatorSetChangedInThisBlock: bool
+
+    // // utility: a struct summarizing the current state
+    // val state = 
+    //     {
+    //         votingPowerHistories: votingPowerHistories,
+    //         runningValidatorSet: runningValidatorSet,
+    //         curChainTimes: curChainTimes,
+    //         consumerStatus: consumerStatus,
+    //         outstandingPacketsToProvider: outstandingPacketsToProvider,
+    //         outstandingPacketsToConsumer: outstandingPacketsToConsumer,
+    //         maturationTimes: maturationTimes,
+    //         receivedMaturations: receivedMaturations,
+    //         sentVSCPackets: sentVSCPackets,
+    //     }
+
+    // // set of identifiers of potential nodes
+    // pure val Nodes: Set[Node] = 
+    //     Set("A", "B", "C", "D", "E", "F", "G", "H", "I", "J")
+
+    // // the set of consumer chains
+    // pure val ConsumerChains: Set[Chain] = 
+    //     Set("chain1", "chain2", "chain3")
+
+    // // The singular provider chain.
+    // pure val ProviderChain: Chain = 
+    //     "provider"
+        
+    // pure val chains = ConsumerChains.union(Set(ProviderChain))
+
+    // // length of the unbonding period on each chain
+    // pure val UnbondingPeriod: Chain -> int = chains.mapBy(
+    //     (chain) => 
+    //     10
+    // )
+
+    // // the time until a packet times out
+    // pure val PacketTimeout: int = 
+    //     5
+
+    // // the time until a consumer chain is dropped by the provider due to inactivity
+    // pure val InactivityTimeout: int =
+    //     10
+
+    // // utility: a map assigning each chain to 0, used for not advancing timestamps
+    // pure val NoTimeAdvancement: Chain -> int = chains.mapBy(
+    //     (chain) => 
+    //     0
+    // )
+
+
+    // // utility: a map assigning each chain to false, used for not advancing consumer status
+    // pure val NoStatusAdvancement: Chain -> bool = chains.mapBy(
+    //     (chain) => 
+    //     false
+    // )
 }
diff --git a/tests/difference/core/quint_model/extraSpells.qnt b/tests/difference/core/quint_model/extraSpells.qnt
index cd2105beb7..5c98f7a384 100644
--- a/tests/difference/core/quint_model/extraSpells.qnt
+++ b/tests/difference/core/quint_model/extraSpells.qnt
@@ -1,4 +1,3 @@
--*- mode: Bluespec; -*-
 // This module is just a library with utility functions (sometimes called spells in Quint).
 module extraSpells {
 
diff --git a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123337-6230.fail b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123337-6230.fail
new file mode 100644
index 0000000000..f2c09a9e15
--- /dev/null
+++ b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123337-6230.fail
@@ -0,0 +1,18 @@
+# 2023/09/12 12:33:37 TestActionMarshalling [rapid] draw Action: main.StartChainAction{Chain:"", Validators:[]main.StartChainValidator{}, GenesisChanges:"", SkipGentx:false}
+# 2023/09/12 12:33:37 TestActionMarshalling error marshalling and unmarshalling chain state:   any(
+# - 	main.StartChainAction{Validators: []main.StartChainValidator{}},
+# + 	map[string]any{
+# + 		"Chain":          string(""),
+# + 		"GenesisChanges": string(""),
+# + 		"SkipGentx":      bool(false),
+# + 		"Validators":     []any{},
+# + 	},
+#   )
+# 
+v0.4.8#6863100771198181688
+0x0
+0x1
+0x0
+0x0
+0x0
+0x0
\ No newline at end of file
diff --git a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123517-6794.fail b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123517-6794.fail
new file mode 100644
index 0000000000..9547963143
--- /dev/null
+++ b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123517-6794.fail
@@ -0,0 +1,14 @@
+# 2023/09/12 12:35:17 TestActionMarshalling [rapid] draw Action: main.SendTokensAction{Chain:"", From:"", To:"", Amount:0x0}
+# 2023/09/12 12:35:17 TestActionMarshalling error marshalling and unmarshalling action: got (+), want (-):   any(
+# - 	main.SendTokensAction{},
+# + 	map[string]any{"Amount": float64(0), "Chain": string(""), "From": string(""), "To": string("")},
+#   )
+# 
+v0.4.8#14250065908211800578
+0x0
+0x0
+0x0
+0x0
+0x0
+0x0
+0x0
\ No newline at end of file
diff --git a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123556-6970.fail b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123556-6970.fail
new file mode 100644
index 0000000000..4ddf365f5c
--- /dev/null
+++ b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123556-6970.fail
@@ -0,0 +1,14 @@
+# 2023/09/12 12:35:56 TestActionMarshalling [rapid] draw Action: main.SendTokensAction{Chain:"", From:"", To:"", Amount:0x0}
+# 2023/09/12 12:35:56 TestActionMarshalling error marshalling and unmarshalling action: got (-), want (+):   any(
+# - 	main.SendTokensAction{},
+# + 	map[string]any{"Amount": float64(0), "Chain": string(""), "From": string(""), "To": string("")},
+#   )
+# 
+v0.4.8#9176735344445930654
+0x0
+0x0
+0x0
+0x0
+0x0
+0x0
+0x0
\ No newline at end of file
diff --git a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123609-7116.fail b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123609-7116.fail
new file mode 100644
index 0000000000..89dcbcc8b2
--- /dev/null
+++ b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123609-7116.fail
@@ -0,0 +1,18 @@
+# 2023/09/12 12:36:09 TestActionMarshalling [rapid] draw Action: main.StartChainAction{Chain:"", Validators:[]main.StartChainValidator{}, GenesisChanges:"", SkipGentx:false}
+# 2023/09/12 12:36:09 TestActionMarshalling error marshalling and unmarshalling action: got (-), want (+):   any(
+# - 	main.StartChainAction{Validators: []main.StartChainValidator{}},
+# + 	map[string]any{
+# + 		"Chain":          string(""),
+# + 		"GenesisChanges": string(""),
+# + 		"SkipGentx":      bool(false),
+# + 		"Validators":     []any{},
+# + 	},
+#   )
+# 
+v0.4.8#17927886955469684979
+0x0
+0x1
+0x0
+0x0
+0x0
+0x0
\ No newline at end of file
diff --git a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123822-8026.fail b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123822-8026.fail
new file mode 100644
index 0000000000..d2493d87a3
--- /dev/null
+++ b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123822-8026.fail
@@ -0,0 +1,8 @@
+# 2023/09/12 12:38:22 TestActionMarshalling [rapid] draw Action: main.addChainToRelayerAction{Chain:"", Validator:""}
+# 2023/09/12 12:38:22 TestActionMarshalling error marshalling and unmarshalling action: error unmarshalling action inside step: unknown action name: main.addChainToRelayerAction
+# 
+v0.4.8#17613601115647214278
+0x9867f1f40f739
+0x9
+0x0
+0x0
\ No newline at end of file
diff --git a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151826-12656.fail b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151826-12656.fail
new file mode 100644
index 0000000000..10fd2ac639
--- /dev/null
+++ b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151826-12656.fail
@@ -0,0 +1,8 @@
+# 2023/09/13 15:18:26 TestActionMarshalling [rapid] draw Action: main.lightClientEquivocationAttackAction{Validator:"", Chain:""}
+# 2023/09/13 15:18:26 TestActionMarshalling error marshalling and unmarshalling action: error unmarshalling action inside step: unknown action name: main.lightClientEquivocationAttackAction
+# 
+v0.4.8#7694661539125204314
+0xc05c654ab866b
+0x1f
+0x0
+0x0
\ No newline at end of file
diff --git a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151917-13146.fail b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151917-13146.fail
new file mode 100644
index 0000000000..6fb9bfa9f7
--- /dev/null
+++ b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151917-13146.fail
@@ -0,0 +1,8 @@
+# 2023/09/13 15:19:17 TestActionMarshalling [rapid] draw Action: main.lightClientLunaticAttackAction{Validator:"", Chain:""}
+# 2023/09/13 15:19:17 TestActionMarshalling error marshalling and unmarshalling action: error unmarshalling action inside step: unknown action name: main.lightClientLunaticAttackAction
+# 
+v0.4.8#10796173543550944397
+0x1f2b5a0e61c3a6
+0x0
+0x0
+0x0
\ No newline at end of file
diff --git a/tests/e2e/testdata/rapid/TestReadAndWriteTrace/TestReadAndWriteTrace-20230913151920-13146.fail b/tests/e2e/testdata/rapid/TestReadAndWriteTrace/TestReadAndWriteTrace-20230913151920-13146.fail
new file mode 100644
index 0000000000..f8e2127feb
--- /dev/null
+++ b/tests/e2e/testdata/rapid/TestReadAndWriteTrace/TestReadAndWriteTrace-20230913151920-13146.fail
@@ -0,0 +1,11 @@
+# 2023/09/13 15:19:20 TestReadAndWriteTrace [rapid] draw Trace: []main.Step{main.Step{Action:main.lightClientEquivocationAttackAction{Validator:"", Chain:""}, State:main.State{}}}
+# 2023/09/13 15:19:20 TestReadAndWriteTrace error writing and reading trace: error reading trace from file: unknown action name: main.lightClientEquivocationAttackAction
+# 
+v0.4.8#17668525343613541116
+0x5555555555555
+0xc05c654ab866b
+0x1f
+0x0
+0x0
+0x0
+0x0
\ No newline at end of file

From 5fa449c8d8684b52146b2a765988ec44883b92a4 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Mon, 18 Sep 2023 18:23:42 +0200
Subject: [PATCH 12/80] Revert "Start rewriting model"

This reverts commit 1320b9517982bff596ecfc0ac99755dc75c5f1e1.
---
 tests/difference/core/quint_model/ccv.qnt     | 1241 ++++++++---------
 .../core/quint_model/extraSpells.qnt          |    1 +
 ...ActionMarshalling-20230912123337-6230.fail |   18 -
 ...ActionMarshalling-20230912123517-6794.fail |   14 -
 ...ActionMarshalling-20230912123556-6970.fail |   14 -
 ...ActionMarshalling-20230912123609-7116.fail |   18 -
 ...ActionMarshalling-20230912123822-8026.fail |    8 -
 ...ctionMarshalling-20230913151826-12656.fail |    8 -
 ...ctionMarshalling-20230913151917-13146.fail |    8 -
 ...eadAndWriteTrace-20230913151920-13146.fail |   11 -
 10 files changed, 551 insertions(+), 790 deletions(-)
 delete mode 100644 tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123337-6230.fail
 delete mode 100644 tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123517-6794.fail
 delete mode 100644 tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123556-6970.fail
 delete mode 100644 tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123609-7116.fail
 delete mode 100644 tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123822-8026.fail
 delete mode 100644 tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151826-12656.fail
 delete mode 100644 tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151917-13146.fail
 delete mode 100644 tests/e2e/testdata/rapid/TestReadAndWriteTrace/TestReadAndWriteTrace-20230913151920-13146.fail

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 4cbc327ac4..d18930ae1d 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -1,4 +1,5 @@
-module ccv_logic {
+-*- mode: Bluespec; -*-
+module ccv {
     import extraSpells.* from "./extraSpells"
 
     // Things that are not modelled:
@@ -11,17 +12,12 @@ module ccv_logic {
     // * VSC packets mature
     // * Consumers can be forcefully dropped due to timeouts, or stop on their own volition
     
-    // ===================
     // TYPE DEFINITIONS
-    // ===================
     type Node = str
     type Chain = str
-    type Power = int
-    type ValidatorSet = Node -> Power
+    type ValidatorSet = Node -> int
     type Height = int
     type Timestamp = int
-    // a list of validator sets per blocks, ordered by recency
-    type VotingPowerHistory = List[ValidatorSet]
 
     // --PACKETS
     type VSCPacket =
@@ -42,719 +38,582 @@ module ccv_logic {
             timeout: Timestamp
         }
     
-    // possible consumer statuses
-    pure val STOPPED = "stopped" // the chain was once a consumer chain, but has been dropped by the provider.
-    pure val RUNNING = "running" // the chain is currently a consumer chain. Running chains are those that get sent VSCPackets.
-    pure val UNUSED = "unused" // the chain has never been a consumer chain, and is available to become one.
-    // When a chain is dropped, it cannot become a consumer again - we assume that would be done by another consumer becoming running.
-
-
-    // state that each chain needs to store, whether consumer or provider.
-    type ChainState = {
-        // Stores the list of voting powers that corresponded to voting powers 
-        // at blocks over the chains entire existence.
-        // Voting powers should be ordered by recency in descending order.
-        votingPowerHistory: VotingPowerHistory,
-
-        // the current validator set on each chain.
-        // this will be included in the next block, but might not be final yet,
-        // e.g. there may be more modifications in the current block.
-        currentValidatorSet: ValidatorSet,
-
-        // the latest timestamp that was comitted on chain
-        lastTimestamp: Timestamp,
-    }
+    // MODEL PARAMETERS
+        
+
+    // set of identifiers of potential nodes
+    pure val Nodes: Set[Node] = 
+        Set("A", "B", "C", "D", "E", "F", "G", "H", "I", "J")
+
+    // the set of consumer chains
+    pure val ConsumerChains: Set[Chain] = 
+        Set("chain1", "chain2", "chain3")
 
-    // Defines the current state of the provider chain. Essentially, all information here is stored by the provider on-chain (or could be derived purely by information that is on-chain).
-    type ProviderState =
+    // The singular provider chain.
+    pure val ProviderChain: Chain = 
+        "provider"
+        
+    pure val chains = ConsumerChains.union(Set(ProviderChain))
+
+    // length of the unbonding period on each chain
+    pure val UnbondingPeriod: Chain -> int = chains.mapBy(
+        (chain) => 
+        10
+    )
+
+    // the time until a packet times out
+    pure val PacketTimeout: int = 
+        5
+
+    // the time until a consumer chain is dropped by the provider due to inactivity
+    pure val InactivityTimeout: int =
+        10
+
+    // consumer statuses
+    pure val STOPPED = "stopped"
+    pure val RUNNING = "running"
+    pure val UNUSED = "unused"
+
+    // utility: a map assigning each chain to 0, used for not advancing timestamps
+    pure val NoTimeAdvancement: Chain -> int = chains.mapBy(
+        (chain) => 
+        0
+    )
+
+    // utility: a struct summarizing the current state
+    val state = 
         {
-            // the state that each chain needs to store
-            chainState: ChainState,
+            votingPowerHistories: votingPowerHistories,
+            runningValidatorSet: runningValidatorSet,
+            curChainTimes: curChainTimes,
+            consumerStatus: consumerStatus,
+            outstandingPacketsToProvider: outstandingPacketsToProvider,
+            outstandingPacketsToConsumer: outstandingPacketsToConsumer,
+            maturationTimes: maturationTimes,
+            receivedMaturations: receivedMaturations,
+            sentVSCPackets: sentVSCPackets,
+        }
+
+
+    // utility: a map assigning each chain to false, used for not advancing consumer status
+    pure val NoStatusAdvancement: Chain -> bool = chains.mapBy(
+        (chain) => 
+        false
+    )
+
+    // utility: the set of consumers currently running
+    val RunningConsumers: Set[Chain] = 
+        ConsumerChains.filter(chain => consumerStatus.get(chain) == RUNNING)
+
+    // MODEL STATE
+    // --SHARED STATE
+
+    // Stores, for each chain, the list of voting powers that corresponded to voting powers 
+    // at blocks over its entire existence.
+    // Voting powers should be ordered by recency in descending order.
+    var votingPowerHistories: Chain -> List[ValidatorSet]
+
+    // the current validator set on each chain.
+    // this will be included in the next block, but might not be final yet,
+    // e.g. there may be more modifications in the current block.
+    var runningValidatorSet: Chain -> ValidatorSet
+
+    // the current timestamp for each chain
+    var curChainTimes: Chain -> Timestamp
+
+    // stores, for each chain, its current status -
+    // unused, running, or stopped
+    var consumerStatus: Chain -> str
+
+    // --CHANNELS
+    // Stores, for each consumer chain, the list of packets that have been sent to the provider chain
+    // and have not been received yet.
+    var outstandingPacketsToProvider: Chain -> List[VSCMaturedPacket]
 
-            // Stores, for each consumer chain, the list of packets that have been sent to the consumer chain
-            // and have not been received yet.
-            // In the implementation, this would roughly be the unacknowledged packets on an ibc channel.
-            outstandingPacketsToConsumer: Chain -> List[VSCPacket],
+    // Stores, for each consumer chain, the list of packets that have been sent to the consumer chain
+    // and have not been received yet.
+    var outstandingPacketsToConsumer: Chain -> List[VSCPacket]
 
-            // the set of received VSCMaturedPackets
-            receivedMaturations: Set[VSCMaturedPacket],
 
-            // stores which VSC Packets have been sent to compare with receivedMaturations to detect timeouts due to non-responsiveness
-            sentVSCPackets: Chain -> Set[VSCPacket],
+    // --CONSUMER STATE
+    // Stores the maturation times for VSCPackets received by consumers
+    var maturationTimes: Chain -> (VSCPacket -> Timestamp)
 
-            // stores whether, in this block, the validator set has changed.
-            // this is needed because the validator set might be considered to have changed, even though
-            // it is still technically identical at our level of abstraction, e.g. a validator power change on the provider
-            // might leave the validator set the same because a delegation and undelegation cancel each other out.
-            providerValidatorSetChangedInThisBlock: bool,
+    // --PROVIDER STATE
+    // the set of VSCMaturedPackets received by the provider chain
+    var receivedMaturations: Set[VSCMaturedPacket]
+
+    // stores which VSC Packets have been sent to compare with receivedMaturations to detect timeouts due to non-responsiveness
+    var sentVSCPackets: Chain -> Set[VSCPacket]
+
+    // stores whether, in this step, the validator set considered to be changed.
+    // this is needed because the validator set might be considered to have changed, even though
+    // it is still technically identical at our level of abstraction, e.g. a validator power change on the provider
+    // might leave the validator set the same because a delegation and undelegation cancel each other out.
+    var providerValidatorSetChangedInThisBlock: bool
+
+
+    // UTILITY FUNCTIONS & ACTIONS
+    def wasValidatorSetOnProvider(validatorSet: ValidatorSet): bool = {
+        votingPowerHistories.get(ProviderChain).toSet().exists(
+            historicalValSet => historicalValSet == validatorSet
+        )
+    }
+
+    def getCurrentValidatorSet(chain: Chain): ValidatorSet = 
+        votingPowerHistories.get(chain).head()
+
+    def getUpdatedValidatorSet(oldValidatorSet: ValidatorSet, validator: Node, newVotingPower: int): ValidatorSet =
+        if (newVotingPower > 0) 
+        oldValidatorSet.put(validator, newVotingPower)
+        else
+        oldValidatorSet.mapRemove(validator)
+
+    // returns true if the consumer has timed out and should be dropped
+    def consumerTimedOut(consumer: Chain): bool =
+        any {
+            // either a package from provider to consumer has timed out
+            outstandingPacketsToConsumer.get(consumer).select(
+                packet => packet.timeout <= curChainTimes.get(consumer)
+            ).length() > 0,
+            // or a package from consumer to provider has timed out
+            outstandingPacketsToProvider.get(consumer).select(
+                packet => packet.timeout <= curChainTimes.get(ProviderChain)
+            ).length() > 0,
+            // or the inactivity timeout has passed since a VSCPacket was sent to the consumer, but the
+            // provider has not received a VSCMaturedPacket for it
+            val packetsWithoutResponse = sentVSCPackets.get(consumer).filter( // get packets without response
+                packet => 
+                not(receivedMaturations.exists(
+                    maturedPacket => maturedPacket.id == packet.id
+                ))
+            )
+            // among those, get packets where inactivity timeout has passed
+            packetsWithoutResponse.filter(
+                packet => 
+                val sentAt = curChainTimes.get(ProviderChain) - PacketTimeout // compute when the packet was sent
+                val timesOutAt = sentAt + InactivityTimeout // compute when the packet times out
+                timesOutAt <= curChainTimes.get(ProviderChain)
+            ).size() > 0
+        }
+
+    // utility action that leaves all provider state untouched
+    action PROVIDER_NOOP(): bool = 
+        all {
+            receivedMaturations' = receivedMaturations,
+        }
 
-            // stores, for each consumer chain, its current status -
-            // unused, running, or stopped
-            consumerStatus: Chain -> str,
+    // utility action that leaves all consumer state untouched
+    action CONSUMER_NOOP(): bool = 
+        all {
+            maturationTimes' = maturationTimes,
         }
+    
 
-    // Defines the current state of a consumer chain. This information is accessible to that consumer on-chain.
-    type ConsumerState = {
-        // the state that each chain needs to store
-        chainState: ChainState,
+    // MODEL ACTIONS
 
-        // Stores the maturation times for VSCPackets received by this consumer
-        maturationTimes: VSCPacket -> Timestamp,
+    // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
+    // e.g. via undelegations, or delegations, ...
+    action votingPowerChange(validator: Node, amount: int): bool =
+        // for the provider chain, we need to adjust the voting power history
+        // by adding a new set
+        all {
+            amount >= 0,
+            val newValidatorSet = getCurrentValidatorSet(ProviderChain).getUpdatedValidatorSet(validator, amount)
+            // set the running validator set on the provider chain, but don't update the history yet
+            runningValidatorSet' = runningValidatorSet.set(ProviderChain, newValidatorSet),
+            // no packets are sent yet, these are only sent on endAndBeginBlock
+            RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
+            outstandingPacketsToProvider' = outstandingPacketsToProvider,
+            receivedMaturations' = receivedMaturations,
+            CONSUMER_NOOP,
+            // voting power history is only updated on endAndBeginBlock
+            votingPowerHistories' = votingPowerHistories,
+            // consumer statusses do not change
+            consumerStatus' = consumerStatus,
+            // chain times do not change
+            curChainTimes' = curChainTimes,
+            // the validator set is considered to have changed
+            providerValidatorSetChangedInThisBlock' = true,
+        }
 
-        // Stores the list of packets that have been sent to the provider chain by this consumer
-        // and have not been received yet.
-        // In the implementation, essentially unacknowledged IBC packets.
-        outstandingPacketsToProvider: Chain -> List[VSCMaturedPacket],
+    // deliver the next outstanding packet from the consumer to the provider.
+    // since this model assumes a single provider chain, this just takes a single chain as argument.
+    action recvPacketOnProvider(consumer: Chain): bool = all {
+        // ensure there is a packet to be received
+        outstandingPacketsToProvider.get(consumer).length() > 0,
+        // remove packet from outstanding packets
+        val newPacketQueue = outstandingPacketsToProvider.get(consumer).tail()
+        outstandingPacketsToProvider' = outstandingPacketsToProvider.set(consumer, newPacketQueue),
+        // register the packet as received
+        val maturedPacket = outstandingPacketsToProvider.get(consumer).head()
+        receivedMaturations' = receivedMaturations.add(maturedPacket),
+        CONSUMER_NOOP,
+        RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
+        votingPowerHistories' = votingPowerHistories,
+        // no validator set changes are made
+        runningValidatorSet' = runningValidatorSet,
+        // consumer statusses do not change
+        consumerStatus' = consumerStatus,
+        // chain times do not change
+        curChainTimes' = curChainTimes,
+        // the validator set was not changed by this action (but might have been changed before in this block)
+        providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+    }
 
-        // Stores the list of voting powers that corresponded to voting powers 
-        // at blocks over the chains entire existence.
-        // Voting powers should be ordered by recency in descending order.
-        votingPowerHistory: VotingPowerHistory,
+    // deliver the next outstanding packet from the provider to the consumer.
+    // since this model assumes a single provider chain, this just takes a single chain as argument.
+    action recvPacketOnConsumer(consumer: Chain): bool = all {
+        // ensure there is a packet to be received
+        outstandingPacketsToConsumer.get(consumer).length() > 0,
+        // remove packet from outstanding packets
+        val newPacketQueue = outstandingPacketsToConsumer.get(consumer).tail()
+        val newOutstandingPackets = outstandingPacketsToConsumer.set(consumer, newPacketQueue)
+        RegisterNewOutstandingPackets(newOutstandingPackets),
+        val packet = outstandingPacketsToConsumer.get(consumer).head()
+        all {
+            // update the running validator set, but not the history yet,
+            // as that only happens when the next block is started
+            runningValidatorSet' = runningValidatorSet.set(consumer, packet.validatorSet),
+            // add the new packet and store its maturation time
+            val newMaturationTimes = maturationTimes.get(consumer).put(packet, curChainTimes.get(consumer) + UnbondingPeriod.get(consumer))
+            maturationTimes' = maturationTimes.set(consumer, newMaturationTimes)
+        },
+        PROVIDER_NOOP,
+        votingPowerHistories' = votingPowerHistories,
+        outstandingPacketsToProvider' = outstandingPacketsToProvider,
+        // consumer statusses do not change
+        consumerStatus' = consumerStatus,
+        // chain times do not change
+        curChainTimes' = curChainTimes,
+        // the validator set was not changed by this action (but might have been changed before in this block)
+        providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
     }
 
-    // the state of the protocol consists of the composition of the state of one provider chain with potentially many consumer chains.
-    type ProtocolState = {
-        providerState: ProviderState,
-        // the state of each consumer chain.
-        // note that we assume that this contains all consumer chains that may ever exist,
-        // and consumer chains that are currently not running will have providerState.consumerStatus == UNUSED or STOPPED
-        consumerStates: Set[ConsumerState]
+    // ends the current block and starts the next block for a given chain.
+    action endAndBeginBlock(chain: Chain): bool = any {
+        all {
+          chain == ProviderChain,
+          endAndBeginBlockForProvider,
+        },
+        all {
+            chain != ProviderChain,
+            endAndBeginBlockForConsumer(chain),
+        }
     }
 
-    type Error = {
-        message: str
+    // gets the updated history for the current chain when ending a block, i.e. the
+    // running validator set is added to the history if different from the last one.
+    def getUpdatedHistory(chain: Chain): List[ValidatorSet] =
+        // update voting power history if the validator set changed
+        val newValidatorSet = runningValidatorSet.get(ProviderChain)
+        val oldValidatorSet = votingPowerHistories.get(ProviderChain).head()
+        if (newValidatorSet != oldValidatorSet) 
+            votingPowerHistories.get(ProviderChain).prepend(newValidatorSet)
+        else
+            votingPowerHistories.get(ProviderChain)
+
+
+    action endAndBeginBlockForProvider(): bool = all {
+        // update the voting power history
+        votingPowerHistories' = votingPowerHistories.set(ProviderChain, getUpdatedHistory(ProviderChain)),
+        // the running validator set is now for sure the current validator set,
+        // so start with it in the next block
+        runningValidatorSet' = runningValidatorSet,
+        // send VSCPackets to consumers
+        val newOutstandingPackets = 
+            // if running validator set is considered to have changed
+            if (providerValidatorSetChangedInThisBlock)
+                // then send a packet to each running consumer
+                outstandingPacketsToConsumer.keys().mapBy(
+                    (consumer) => 
+                    val packetQueue = outstandingPacketsToConsumer.get(consumer)
+                    if (consumerStatus.get(consumer) == RUNNING) {
+                        packetQueue.append(
+                            {
+                                id: packetQueue.length(),
+                                validatorSet: runningValidatorSet.get(ProviderChain),
+                                timeout: curChainTimes.get(ProviderChain) + PacketTimeout
+                            }
+                        )
+                    } else {
+                        packetQueue
+                    }
+                )
+            else
+                // otherwise, don't send any packets
+                outstandingPacketsToConsumer
+        RegisterNewOutstandingPackets(newOutstandingPackets),
+        CONSUMER_NOOP,
+        // no packets are sent to the provider
+        outstandingPacketsToProvider' = outstandingPacketsToProvider,
+        // do not receive any maturations
+        receivedMaturations' = receivedMaturations,
+        // consumer statusses do not change
+        consumerStatus' = consumerStatus,
+        // chain times do not change
+        curChainTimes' = curChainTimes,
+        // the validator set was definitely not changed in the new block yet, so set to false
+        providerValidatorSetChangedInThisBlock' = false
     }
 
-    // we return either a result or an error.
-    // if hasError is true, newState may be arbitrary, but the error will be meaningful.
-    // if hasError is false, error may be arbitrary, but newState will be meaningful.
-    type Result = {
-        hasError: bool,
-        newState: ProtocolState,
-        error: Error
+    action endAndBeginBlockForConsumer(consumer: Chain): bool = all {
+        ConsumerChains.contains(consumer),
+        // update the voting power history
+        votingPowerHistories' = votingPowerHistories.set(consumer, getUpdatedHistory(consumer)),
+        // the running validator set is now for sure the current validator set,
+        // so start with it in the next block
+        runningValidatorSet' = runningValidatorSet,
+        // compute mature packets whose maturation time has passed
+        val maturedPackets = maturationTimes.get(consumer).keys().filter(
+            packet => 
+            val maturationTime = maturationTimes.get(consumer).get(packet)
+            maturationTime <= curChainTimes.get(consumer)
+        )
+        all {
+            // remove matured packets from the maturation times
+            maturationTimes' = maturationTimes.set(consumer, maturationTimes.get(consumer).mapRemoveAll(maturedPackets)),
+            // send matured packets
+            outstandingPacketsToProvider' = outstandingPacketsToProvider.set(
+                consumer, 
+                // construct VSCMaturedPackets from the matured VSCPackets
+                outstandingPacketsToProvider.get(consumer).concat(
+                    maturedPackets.map(packet => {id: packet.id, timeout: 5}).toList()
+                )
+            )
+        },
+        PROVIDER_NOOP,
+        // no packets are sent to consumer or received by it
+        RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
+        // consumer statusses do not change
+        consumerStatus' = consumerStatus,
+        // chain times do not change
+        curChainTimes' = curChainTimes,
+        // the validator set was not changed by this action (but might have been changed before in this block)
+        // also, this is only a new block for a consumer, so the change variable shouldn't be reset
+        providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
     }
 
-    pure def Ok(newState: ProtocolState): Result = {
+    // advance timestamps for maps nondeterministically
+    action AdvanceTime(): bool = 
+            val advanceAmounts = curChainTimes.keys().mapBy(
+                chain =>    
+                nondet amount = oneOf(1.to(10))
+                amount
+            )
+            AdvanceTimeByMap(advanceAmounts)
+
+    // the timestamp for each chain is advanced by the given amount
+    action AdvanceTimeByMap(advancementAmount: Chain -> int): bool = all
         {
-            hasError: false,
-            newState: newState,
-            error: {
-                message: ""
-            }
+            curChainTimes' = curChainTimes.keys().mapBy(
+                chain => 
+                curChainTimes.get(chain) + advancementAmount.get(chain)
+            ),
+            // all other variables are left untouched
+            votingPowerHistories' = votingPowerHistories,
+            runningValidatorSet' = runningValidatorSet,
+            outstandingPacketsToProvider' = outstandingPacketsToProvider,
+            RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
+            receivedMaturations' = receivedMaturations,
+            maturationTimes' = maturationTimes,
+            // chain times do not change
+            consumerStatus' = consumerStatus,
+            // the validator set was not changed by this action (but might have been changed before in this block)
+            providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
         }
-    }
 
-    pure def Err(msg: str): Result = {
-        {
-            hasError: true,
-            newState: {
-                providerState: {
-                    chainState: {
-                        votingPowerHistory: List(),
-                        currentValidatorSet: Map(),
-                        lastTimestamp: 0
-                    },
-                    outstandingPacketsToConsumer: Map(),
-                    receivedMaturations: Set(),
-                    sentVSCPackets: Map(),
-                    providerValidatorSetChangedInThisBlock: false,
-                    consumerStatus: Map()
-                },
-                consumerStates: Set()
-            },
-            error: {
-                message: msg
+    // each consumer chain may advance in the order
+    // some events may necessitate a transition, e.g. timeouts.
+    // shouldAdvance gives, for each consumer chain, whether it should advance if possible.
+    // if a chain has to advance, e.g. due to timeouts, or may not advance, the value will have no effect.
+    action AdvanceConsumers(shouldAdvance: Chain -> bool): bool = 
+        val newConsumerStatus = consumerStatus.keys().mapBy(
+            chain => 
+            val curStatus = consumerStatus.get(chain)
+            if (curStatus == UNUSED) {
+                if (shouldAdvance.get(chain))
+                {
+                    RUNNING
+                } else {
+                    UNUSED
+                }
             }
+            else if (curStatus == RUNNING) {
+                // the chain may transition to stopped.
+                // it is *forced* to stop if a packet timed out,
+                // or if the inactivity timeout has passed
+                if(consumerTimedOut(chain)) {
+                    STOPPED
+                } else {
+                    if (shouldAdvance.get(chain)) {
+                        RUNNING
+                    } else {
+                        STOPPED
+                    }
+                }
+            } else {
+                // stopped chains cannot restart, we assume a new chain would be started in that case
+                STOPPED
+            }
+            )
+        all {
+            consumerStatus' = newConsumerStatus,
+            // all other variables are left untouched
+            votingPowerHistories' = votingPowerHistories,
+            runningValidatorSet' = runningValidatorSet.keys().mapBy(
+                chain => 
+                if (newConsumerStatus.get(chain) == RUNNING and consumerStatus.get(chain) == UNUSED) 
+                // consumers that went from unused to running start with the current validator set on the provider
+                { 
+                    runningValidatorSet.get(ProviderChain) 
+                } else {
+                    runningValidatorSet.get(chain)
+                }
+            ),
+            outstandingPacketsToProvider' = outstandingPacketsToProvider,
+            RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
+            receivedMaturations' = receivedMaturations,
+            maturationTimes' = maturationTimes,
+            // chain times do not change
+            curChainTimes' = curChainTimes,
+            // the validator set was not changed by this action (but might have been changed before in this block)
+            providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
         }
-    }
 
-    // ===================
-    // PROTOCOL LOGIC
-    // ===================
+    // Updates the outstandingPacketsToConsumer and sentVSCPackets variables
+    action RegisterNewOutstandingPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
+        all {
+            outstandingPacketsToConsumer' = newOutstandingPackets,
+            StoreSentPackets(newOutstandingPackets),
+        }
 
-    pure def getUpdatedValidatorSet(oldValidatorSet: ValidatorSet, validator: Node, newVotingPower: int): ValidatorSet =
-        if (newVotingPower > 0) 
-        oldValidatorSet.put(validator, newVotingPower)
-        else
-        oldValidatorSet.mapRemove(validator)
-    
-    // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
-    // e.g. via undelegations, or delegations, ...
-    pure def votingPowerChange(currentState: ProtocolState, validator: Node, amount: int): Result =
-            // adjust the current validator set on the provider - it is not entered in the voting history yet because that happens only on block end
-            val currentValidatorSet = currentState.providerState.currentValidatorSet
-            // val newValidatorSet = getUpdatedValidatorSet(currentValidatorSet, validator, amount)
-            // val newProviderState = currentState.providerState.with(
-            //     "currentValidatorSet", newValidatorSet
-            // )
-            // val newState = currentState.with(
-            //     "providerState", newProviderState
-            // )
-            Err("not implemented")
-}
 
-module ccv_tests {
-    import ccv_logic.*
-
-    // // UTILITY FUNCTIONS & ACTIONS
-    // def wasValidatorSetOnProvider(validatorSet: ValidatorSet): bool = {
-    //     votingPowerHistories.get(ProviderChain).toSet().exists(
-    //         historicalValSet => historicalValSet == validatorSet
-    //     )
-    // }
-
-    // def getCurrentValidatorSet(chain: Chain): ValidatorSet = 
-    //     votingPowerHistories.get(chain).head()
-
-    // // returns true if the consumer has timed out and should be dropped
-    // def consumerTimedOut(consumer: Chain): bool =
-    //     any {
-    //         // either a package from provider to consumer has timed out
-    //         outstandingPacketsToConsumer.get(consumer).select(
-    //             packet => packet.timeout <= curChainTimes.get(consumer)
-    //         ).length() > 0,
-    //         // or a package from consumer to provider has timed out
-    //         outstandingPacketsToProvider.get(consumer).select(
-    //             packet => packet.timeout <= curChainTimes.get(ProviderChain)
-    //         ).length() > 0,
-    //         // or the inactivity timeout has passed since a VSCPacket was sent to the consumer, but the
-    //         // provider has not received a VSCMaturedPacket for it
-    //         val packetsWithoutResponse = sentVSCPackets.get(consumer).filter( // get packets without response
-    //             packet => 
-    //             not(receivedMaturations.exists(
-    //                 maturedPacket => maturedPacket.id == packet.id
-    //             ))
-    //         )
-    //         // among those, get packets where inactivity timeout has passed
-    //         packetsWithoutResponse.filter(
-    //             packet => 
-    //             val sentAt = curChainTimes.get(ProviderChain) - PacketTimeout // compute when the packet was sent
-    //             val timesOutAt = sentAt + InactivityTimeout // compute when the packet times out
-    //             timesOutAt <= curChainTimes.get(ProviderChain)
-    //         ).size() > 0
-    //     }
-
-    // // utility action that leaves all provider state untouched
-    // action PROVIDER_NOOP(): bool = 
-    //     all {
-    //         receivedMaturations' = receivedMaturations,
-    //     }
-
-    // // utility action that leaves all consumer state untouched
-    // action CONSUMER_NOOP(): bool = 
-    //     all {
-    //         maturationTimes' = maturationTimes,
-    //     }
+    // stores the VSCPackets sent in this step in sentVSCPackets
+    action StoreSentPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
+        sentVSCPackets' = sentVSCPackets.keys().mapBy(
+            (chain) => 
+            sentVSCPackets.get(chain).union(newOutstandingPackets.get(chain).toSet())
+        )
+
     
+    // the main step action 
+    action step: bool = any {
+        AdvanceTime,
+        nondet node = oneOf(Nodes)
+        nondet amount = oneOf(1.to(10))
+        votingPowerChange(node, amount),
+        recvPacketOnProvider(oneOf(ConsumerChains)),
+        recvPacketOnConsumer(oneOf(ConsumerChains)),
+        nondet chain = oneOf(chains)
+        endAndBeginBlock(chain),
+        val shouldAdvance = ConsumerChains.mapBy(
+            chain => 
+            nondet should = oneOf(Set(true, false))
+            should
+        )
+        AdvanceConsumers(shouldAdvance),
+    }
+
+    pure val nodePowerSet = Nodes.powerset()
+
+    def getArbitraryValidatorSet(): ValidatorSet = 
+        nondet numValidators = oneOf(1.to(Nodes.size()))
+        // toList has nondeterministic behaviour, so this gets arbitrary validators
+        nondet validators = oneOf(nodePowerSet.filter(s => s.size() == numValidators))
+        validators.mapBy(
+            validator => 
+            nondet votingPower = oneOf(1.to(10))
+            votingPower
+        )
+
+    // INITIALIZATION
+    action init: bool = 
+    all {
+        val validatorSets = chains.mapBy(
+            (chain) => 
+        // provider chain gets an arbitrary validator set, consumer chains have none
+            if (chain == ProviderChain) getArbitraryValidatorSet else Map()
+        )
+        all {
+            votingPowerHistories' = chains.mapBy(
+                (chain) => 
+                List(validatorSets.get(chain))
+            ),
+            runningValidatorSet' = validatorSets,
+        },
+        // each chain starts at time 0
+        curChainTimes' = chains.mapBy(
+            (chain) => 0
+        ),
+        // all consumer chains are unused
+        consumerStatus' = chains.mapBy(chain => UNUSED),
+        // no packets are outstanding
+        outstandingPacketsToProvider' = chains.mapBy(chain => List()),
+        outstandingPacketsToConsumer' = chains.mapBy(chain => List()),
+        // no maturations have been received by provider
+        receivedMaturations' = Set(),
+        // no packets have been sent to consumers
+        sentVSCPackets' = chains.mapBy(chain => Set()),
+        // no packets have been received by consumers, so no maturation times set
+        maturationTimes' = chains.mapBy(chain => Map()),
+        // validator set was not changed yet
+        providerValidatorSetChangedInThisBlock' = false
+    }
+
+    // PROPERTIES
+
+    // Every validator set on any consumer chain MUST either be or
+    // have been a validator set on the provider chain.
+    val ValidatorSetReplication: bool = 
+        chains.forall(
+            chain => chain.getCurrentValidatorSet().wasValidatorSetOnProvider()
+        )
+
+    // TESTS
+    run VSCHappyPathTest: bool = {
+        init
+        // trigger a votingPowerChange on the provider chain
+        .then(votingPowerChange("A", 10))
+        // endAndBeginBlock on provider. No consumer chains are running, so no packets are sent
+        .then(endAndBeginBlock(ProviderChain))
+        .then(all {
+            // no packet was sent
+            assert(outstandingPacketsToConsumer.get("chain1").length() == 0),
+            // advance chain1 to running
+            AdvanceConsumers(NoStatusAdvancement.set("chain1", true))
+        })
+        // consumer chain should have current validator set from provider
+        .then(
+            all { 
+                // since consumer chain just started, its assumed to have the validator set from provider
+                assert(runningValidatorSet.get("chain1") == runningValidatorSet.get(ProviderChain)),
+                // trigger a votingPowerChange on the provider chain
+                votingPowerChange("B", 10)
+            }
+        )
+        .then(
+            val valSet = runningValidatorSet.get(ProviderChain)
+            endAndBeginBlock(ProviderChain)
+            // now the provider should send a packet on block end
+            .then(all {
+                // a packet was sent
+                assert(outstandingPacketsToConsumer.get("chain1").length() == 1),
+                // deliver the packet to the consumer
+                recvPacketOnConsumer("chain1")
+            })
+            .then(
+                // consumer needs to end a block before it has the new validator set
+                endAndBeginBlock("chain1")
+            )
+            .then(all {
+                // the consumer should have the new validator set
+                assert(runningValidatorSet.get("chain1") == valSet),
+                // put a last action to satisfy the action effect
+                AdvanceConsumers(NoStatusAdvancement)
+            })
+        )
+    }
 
-    // // MODEL ACTIONS
-
-    // // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
-    // // e.g. via undelegations, or delegations, ...
-    // action doVotingPowerChange(validator: Node, amount: int): bool =
-    //     // for the provider chain, we need to adjust the voting power history
-    //     // by adding a new set
-    //     all {
-    //         amount >= 0,
-    //         val newValidatorSet = getCurrentValidatorSet(ProviderChain).getUpdatedValidatorSet(validator, amount)
-    //         // set the running validator set on the provider chain, but don't update the history yet
-    //         runningValidatorSet' = runningValidatorSet.set(ProviderChain, newValidatorSet),
-    //         // no packets are sent yet, these are only sent on endAndBeginBlock
-    //         RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-    //         outstandingPacketsToProvider' = outstandingPacketsToProvider,
-    //         receivedMaturations' = receivedMaturations,
-    //         CONSUMER_NOOP,
-    //         // voting power history is only updated on endAndBeginBlock
-    //         votingPowerHistories' = votingPowerHistories,
-    //         // consumer statusses do not change
-    //         consumerStatus' = consumerStatus,
-    //         // chain times do not change
-    //         curChainTimes' = curChainTimes,
-    //         // the validator set is considered to have changed
-    //         providerValidatorSetChangedInThisBlock' = true,
-    //     }
-
-    // // deliver the next outstanding packet from the consumer to the provider.
-    // // since this model assumes a single provider chain, this just takes a single chain as argument.
-    // action recvPacketOnProvider(consumer: Chain): bool = all {
-    //     // ensure there is a packet to be received
-    //     outstandingPacketsToProvider.get(consumer).length() > 0,
-    //     // remove packet from outstanding packets
-    //     val newPacketQueue = outstandingPacketsToProvider.get(consumer).tail()
-    //     outstandingPacketsToProvider' = outstandingPacketsToProvider.set(consumer, newPacketQueue),
-    //     // register the packet as received
-    //     val maturedPacket = outstandingPacketsToProvider.get(consumer).head()
-    //     receivedMaturations' = receivedMaturations.add(maturedPacket),
-    //     CONSUMER_NOOP,
-    //     RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-    //     votingPowerHistories' = votingPowerHistories,
-    //     // no validator set changes are made
-    //     runningValidatorSet' = runningValidatorSet,
-    //     // consumer statusses do not change
-    //     consumerStatus' = consumerStatus,
-    //     // chain times do not change
-    //     curChainTimes' = curChainTimes,
-    //     // the validator set was not changed by this action (but might have been changed before in this block)
-    //     providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
-    // }
-
-    // // deliver the next outstanding packet from the provider to the consumer.
-    // // since this model assumes a single provider chain, this just takes a single chain as argument.
-    // action recvPacketOnConsumer(consumer: Chain): bool = all {
-    //     // ensure there is a packet to be received
-    //     outstandingPacketsToConsumer.get(consumer).length() > 0,
-    //     // remove packet from outstanding packets
-    //     val newPacketQueue = outstandingPacketsToConsumer.get(consumer).tail()
-    //     val newOutstandingPackets = outstandingPacketsToConsumer.set(consumer, newPacketQueue)
-    //     RegisterNewOutstandingPackets(newOutstandingPackets),
-    //     val packet = outstandingPacketsToConsumer.get(consumer).head()
-    //     all {
-    //         // update the running validator set, but not the history yet,
-    //         // as that only happens when the next block is started
-    //         runningValidatorSet' = runningValidatorSet.set(consumer, packet.validatorSet),
-    //         // add the new packet and store its maturation time
-    //         val newMaturationTimes = maturationTimes.get(consumer).put(packet, curChainTimes.get(consumer) + UnbondingPeriod.get(consumer))
-    //         maturationTimes' = maturationTimes.set(consumer, newMaturationTimes)
-    //     },
-    //     PROVIDER_NOOP,
-    //     votingPowerHistories' = votingPowerHistories,
-    //     outstandingPacketsToProvider' = outstandingPacketsToProvider,
-    //     // consumer statusses do not change
-    //     consumerStatus' = consumerStatus,
-    //     // chain times do not change
-    //     curChainTimes' = curChainTimes,
-    //     // the validator set was not changed by this action (but might have been changed before in this block)
-    //     providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
-    // }
-
-    // // ends the current block and starts the next block for a given chain.
-    // action endAndBeginBlock(chain: Chain): bool = any {
-    //     all {
-    //       chain == ProviderChain,
-    //       endAndBeginBlockForProvider,
-    //     },
-    //     all {
-    //         chain != ProviderChain,
-    //         endAndBeginBlockForConsumer(chain),
-    //     }
-    // }
-
-    // // gets the updated history for the current chain when ending a block, i.e. the
-    // // running validator set is added to the history if different from the last one.
-    // def getUpdatedHistory(chain: Chain): List[ValidatorSet] =
-    //     // update voting power history if the validator set changed
-    //     val newValidatorSet = runningValidatorSet.get(ProviderChain)
-    //     val oldValidatorSet = votingPowerHistories.get(ProviderChain).head()
-    //     if (newValidatorSet != oldValidatorSet) 
-    //         votingPowerHistories.get(ProviderChain).prepend(newValidatorSet)
-    //     else
-    //         votingPowerHistories.get(ProviderChain)
-
-
-    // action endAndBeginBlockForProvider(): bool = all {
-    //     // update the voting power history
-    //     votingPowerHistories' = votingPowerHistories.set(ProviderChain, getUpdatedHistory(ProviderChain)),
-    //     // the running validator set is now for sure the current validator set,
-    //     // so start with it in the next block
-    //     runningValidatorSet' = runningValidatorSet,
-    //     // send VSCPackets to consumers
-    //     val newOutstandingPackets = 
-    //         // if running validator set is considered to have changed
-    //         if (providerValidatorSetChangedInThisBlock)
-    //             // then send a packet to each running consumer
-    //             outstandingPacketsToConsumer.keys().mapBy(
-    //                 (consumer) => 
-    //                 val packetQueue = outstandingPacketsToConsumer.get(consumer)
-    //                 if (consumerStatus.get(consumer) == RUNNING) {
-    //                     packetQueue.append(
-    //                         {
-    //                             id: packetQueue.length(),
-    //                             validatorSet: runningValidatorSet.get(ProviderChain),
-    //                             timeout: curChainTimes.get(ProviderChain) + PacketTimeout
-    //                         }
-    //                     )
-    //                 } else {
-    //                     packetQueue
-    //                 }
-    //             )
-    //         else
-    //             // otherwise, don't send any packets
-    //             outstandingPacketsToConsumer
-    //     RegisterNewOutstandingPackets(newOutstandingPackets),
-    //     CONSUMER_NOOP,
-    //     // no packets are sent to the provider
-    //     outstandingPacketsToProvider' = outstandingPacketsToProvider,
-    //     // do not receive any maturations
-    //     receivedMaturations' = receivedMaturations,
-    //     // consumer statusses do not change
-    //     consumerStatus' = consumerStatus,
-    //     // chain times do not change
-    //     curChainTimes' = curChainTimes,
-    //     // the validator set was definitely not changed in the new block yet, so set to false
-    //     providerValidatorSetChangedInThisBlock' = false
-    // }
-
-    // action endAndBeginBlockForConsumer(consumer: Chain): bool = all {
-    //     ConsumerChains.contains(consumer),
-    //     // update the voting power history
-    //     votingPowerHistories' = votingPowerHistories.set(consumer, getUpdatedHistory(consumer)),
-    //     // the running validator set is now for sure the current validator set,
-    //     // so start with it in the next block
-    //     runningValidatorSet' = runningValidatorSet,
-    //     // compute mature packets whose maturation time has passed
-    //     val maturedPackets = maturationTimes.get(consumer).keys().filter(
-    //         packet => 
-    //         val maturationTime = maturationTimes.get(consumer).get(packet)
-    //         maturationTime <= curChainTimes.get(consumer)
-    //     )
-    //     all {
-    //         // remove matured packets from the maturation times
-    //         maturationTimes' = maturationTimes.set(consumer, maturationTimes.get(consumer).mapRemoveAll(maturedPackets)),
-    //         // send matured packets
-    //         outstandingPacketsToProvider' = outstandingPacketsToProvider.set(
-    //             consumer, 
-    //             // construct VSCMaturedPackets from the matured VSCPackets
-    //             outstandingPacketsToProvider.get(consumer).concat(
-    //                 maturedPackets.map(packet => {id: packet.id, timeout: 5}).toList()
-    //             )
-    //         )
-    //     },
-    //     PROVIDER_NOOP,
-    //     // no packets are sent to consumer or received by it
-    //     RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-    //     // consumer statusses do not change
-    //     consumerStatus' = consumerStatus,
-    //     // chain times do not change
-    //     curChainTimes' = curChainTimes,
-    //     // the validator set was not changed by this action (but might have been changed before in this block)
-    //     // also, this is only a new block for a consumer, so the change variable shouldn't be reset
-    //     providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
-    // }
-
-    // // advance timestamps for maps nondeterministically
-    // action AdvanceTime(): bool = 
-    //         val advanceAmounts = curChainTimes.keys().mapBy(
-    //             chain =>    
-    //             nondet amount = oneOf(1.to(10))
-    //             amount
-    //         )
-    //         AdvanceTimeByMap(advanceAmounts)
-
-    // // the timestamp for each chain is advanced by the given amount
-    // action AdvanceTimeByMap(advancementAmount: Chain -> int): bool = all
-    //     {
-    //         curChainTimes' = curChainTimes.keys().mapBy(
-    //             chain => 
-    //             curChainTimes.get(chain) + advancementAmount.get(chain)
-    //         ),
-    //         // all other variables are left untouched
-    //         votingPowerHistories' = votingPowerHistories,
-    //         runningValidatorSet' = runningValidatorSet,
-    //         outstandingPacketsToProvider' = outstandingPacketsToProvider,
-    //         RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-    //         receivedMaturations' = receivedMaturations,
-    //         maturationTimes' = maturationTimes,
-    //         // chain times do not change
-    //         consumerStatus' = consumerStatus,
-    //         // the validator set was not changed by this action (but might have been changed before in this block)
-    //         providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
-    //     }
-
-    // // each consumer chain may advance in the order
-    // // some events may necessitate a transition, e.g. timeouts.
-    // // shouldAdvance gives, for each consumer chain, whether it should advance if possible.
-    // // if a chain has to advance, e.g. due to timeouts, or may not advance, the value will have no effect.
-    // action AdvanceConsumers(shouldAdvance: Chain -> bool): bool = 
-    //     val newConsumerStatus = consumerStatus.keys().mapBy(
-    //         chain => 
-    //         val curStatus = consumerStatus.get(chain)
-    //         if (curStatus == UNUSED) {
-    //             if (shouldAdvance.get(chain))
-    //             {
-    //                 RUNNING
-    //             } else {
-    //                 UNUSED
-    //             }
-    //         }
-    //         else if (curStatus == RUNNING) {
-    //             // the chain may transition to stopped.
-    //             // it is *forced* to stop if a packet timed out,
-    //             // or if the inactivity timeout has passed
-    //             if(consumerTimedOut(chain)) {
-    //                 STOPPED
-    //             } else {
-    //                 if (shouldAdvance.get(chain)) {
-    //                     RUNNING
-    //                 } else {
-    //                     STOPPED
-    //                 }
-    //             }
-    //         } else {
-    //             // stopped chains cannot restart, we assume a new chain would be started in that case
-    //             STOPPED
-    //         }
-    //         )
-    //     all {
-    //         consumerStatus' = newConsumerStatus,
-    //         // all other variables are left untouched
-    //         votingPowerHistories' = votingPowerHistories,
-    //         runningValidatorSet' = runningValidatorSet.keys().mapBy(
-    //             chain => 
-    //             if (newConsumerStatus.get(chain) == RUNNING and consumerStatus.get(chain) == UNUSED) 
-    //             // consumers that went from unused to running start with the current validator set on the provider
-    //             { 
-    //                 runningValidatorSet.get(ProviderChain) 
-    //             } else {
-    //                 runningValidatorSet.get(chain)
-    //             }
-    //         ),
-    //         outstandingPacketsToProvider' = outstandingPacketsToProvider,
-    //         RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-    //         receivedMaturations' = receivedMaturations,
-    //         maturationTimes' = maturationTimes,
-    //         // chain times do not change
-    //         curChainTimes' = curChainTimes,
-    //         // the validator set was not changed by this action (but might have been changed before in this block)
-    //         providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
-    //     }
-
-    // // Updates the outstandingPacketsToConsumer and sentVSCPackets variables
-    // action RegisterNewOutstandingPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
-    //     all {
-    //         outstandingPacketsToConsumer' = newOutstandingPackets,
-    //         StoreSentPackets(newOutstandingPackets),
-    //     }
-
-
-    // // stores the VSCPackets sent in this step in sentVSCPackets
-    // action StoreSentPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
-    //     sentVSCPackets' = sentVSCPackets.keys().mapBy(
-    //         (chain) => 
-    //         sentVSCPackets.get(chain).union(newOutstandingPackets.get(chain).toSet())
-    //     )
 
-    
-    // // the main step action 
-    // action step: bool = any {
-    //     AdvanceTime,
-    //     nondet node = oneOf(Nodes)
-    //     nondet amount = oneOf(1.to(10))
-    //     votingPowerChange(node, amount),
-    //     recvPacketOnProvider(oneOf(ConsumerChains)),
-    //     recvPacketOnConsumer(oneOf(ConsumerChains)),
-    //     nondet chain = oneOf(chains)
-    //     endAndBeginBlock(chain),
-    //     val shouldAdvance = ConsumerChains.mapBy(
-    //         chain => 
-    //         nondet should = oneOf(Set(true, false))
-    //         should
-    //     )
-    //     AdvanceConsumers(shouldAdvance),
-    // }
-
-    // pure val nodePowerSet = Nodes.powerset()
-
-    // def getArbitraryValidatorSet(): ValidatorSet = 
-    //     nondet numValidators = oneOf(1.to(Nodes.size()))
-    //     // toList has nondeterministic behaviour, so this gets arbitrary validators
-    //     nondet validators = oneOf(nodePowerSet.filter(s => s.size() == numValidators))
-    //     validators.mapBy(
-    //         validator => 
-    //         nondet votingPower = oneOf(1.to(10))
-    //         votingPower
-    //     )
-
-    // // INITIALIZATION
-    // action init: bool = 
-    // all {
-    //     val validatorSets = chains.mapBy(
-    //         (chain) => 
-    //     // provider chain gets an arbitrary validator set, consumer chains have none
-    //         if (chain == ProviderChain) getArbitraryValidatorSet else Map()
-    //     )
-    //     all {
-    //         votingPowerHistories' = chains.mapBy(
-    //             (chain) => 
-    //             List(validatorSets.get(chain))
-    //         ),
-    //         runningValidatorSet' = validatorSets,
-    //     },
-    //     // each chain starts at time 0
-    //     curChainTimes' = chains.mapBy(
-    //         (chain) => 0
-    //     ),
-    //     // all consumer chains are unused
-    //     consumerStatus' = chains.mapBy(chain => UNUSED),
-    //     // no packets are outstanding
-    //     outstandingPacketsToProvider' = chains.mapBy(chain => List()),
-    //     outstandingPacketsToConsumer' = chains.mapBy(chain => List()),
-    //     // no maturations have been received by provider
-    //     receivedMaturations' = Set(),
-    //     // no packets have been sent to consumers
-    //     sentVSCPackets' = chains.mapBy(chain => Set()),
-    //     // no packets have been received by consumers, so no maturation times set
-    //     maturationTimes' = chains.mapBy(chain => Map()),
-    //     // validator set was not changed yet
-    //     providerValidatorSetChangedInThisBlock' = false
-    // }
-
-    // // PROPERTIES
-
-    // // Every validator set on any consumer chain MUST either be or
-    // // have been a validator set on the provider chain.
-    // val ValidatorSetReplication: bool = 
-    //     chains.forall(
-    //         chain => chain.getCurrentValidatorSet().wasValidatorSetOnProvider()
-    //     )
-
-    // // TESTS
-    // run VSCHappyPathTest: bool = {
-    //     init
-    //     // trigger a votingPowerChange on the provider chain
-    //     .then(votingPowerChange("A", 10))
-    //     // endAndBeginBlock on provider. No consumer chains are running, so no packets are sent
-    //     .then(endAndBeginBlock(ProviderChain))
-    //     .then(all {
-    //         // no packet was sent
-    //         assert(outstandingPacketsToConsumer.get("chain1").length() == 0),
-    //         // advance chain1 to running
-    //         AdvanceConsumers(NoStatusAdvancement.set("chain1", true))
-    //     })
-    //     // consumer chain should have current validator set from provider
-    //     .then(
-    //         all { 
-    //             // since consumer chain just started, its assumed to have the validator set from provider
-    //             assert(runningValidatorSet.get("chain1") == runningValidatorSet.get(ProviderChain)),
-    //             // trigger a votingPowerChange on the provider chain
-    //             votingPowerChange("B", 10)
-    //         }
-    //     )
-    //     .then(
-    //         val valSet = runningValidatorSet.get(ProviderChain)
-    //         endAndBeginBlock(ProviderChain)
-    //         // now the provider should send a packet on block end
-    //         .then(all {
-    //             // a packet was sent
-    //             assert(outstandingPacketsToConsumer.get("chain1").length() == 1),
-    //             // deliver the packet to the consumer
-    //             recvPacketOnConsumer("chain1")
-    //         })
-    //         .then(
-    //             // consumer needs to end a block before it has the new validator set
-    //             endAndBeginBlock("chain1")
-    //         )
-    //         .then(all {
-    //             // the consumer should have the new validator set
-    //             assert(runningValidatorSet.get("chain1") == valSet),
-    //             // put a last action to satisfy the action effect
-    //             AdvanceConsumers(NoStatusAdvancement)
-    //         })
-    //     )
-    // }
-
-    // // utility: the set of consumers currently running
-    // val RunningConsumers: Set[Chain] = 
-    //     ConsumerChains.filter(chain => consumerStatus.get(chain) == RUNNING)
-
-    // // MODEL STATE
-    // // --SHARED STATE
-
-    // // Stores, for each chain, the list of voting powers that corresponded to voting powers 
-    // // at blocks over its entire existence.
-    // // Voting powers should be ordered by recency in descending order.
-    // var votingPowerHistories: Chain -> List[ValidatorSet]
-
-    // // the current validator set on each chain.
-    // // this will be included in the next block, but might not be final yet,
-    // // e.g. there may be more modifications in the current block.
-    // var runningValidatorSet: Chain -> ValidatorSet
-
-    // // the current timestamp for each chain
-    // var curChainTimes: Chain -> Timestamp
-
-    // // stores, for each chain, its current status -
-    // // unused, running, or stopped
-    // var consumerStatus: Chain -> str
-
-    // // --CHANNELS
-    // // Stores, for each consumer chain, the list of packets that have been sent to the provider chain
-    // // and have not been received yet.
-    // var outstandingPacketsToProvider: Chain -> List[VSCMaturedPacket]
-
-    // // Stores, for each consumer chain, the list of packets that have been sent to the consumer chain
-    // // and have not been received yet.
-    // var outstandingPacketsToConsumer: Chain -> List[VSCPacket]
-
-
-    // // --CONSUMER STATE
-    // // Stores the maturation times for VSCPackets received by consumers
-    // var maturationTimes: Chain -> (VSCPacket -> Timestamp)
-
-    // // --PROVIDER STATE
-    // // the set of VSCMaturedPackets received by the provider chain
-    // var receivedMaturations: Set[VSCMaturedPacket]
-
-    // // stores which VSC Packets have been sent to compare with receivedMaturations to detect timeouts due to non-responsiveness
-    // var sentVSCPackets: Chain -> Set[VSCPacket]
-
-    // // stores whether, in this step, the validator set considered to be changed.
-    // // this is needed because the validator set might be considered to have changed, even though
-    // // it is still technically identical at our level of abstraction, e.g. a validator power change on the provider
-    // // might leave the validator set the same because a delegation and undelegation cancel each other out.
-    // var providerValidatorSetChangedInThisBlock: bool
-
-    // // utility: a struct summarizing the current state
-    // val state = 
-    //     {
-    //         votingPowerHistories: votingPowerHistories,
-    //         runningValidatorSet: runningValidatorSet,
-    //         curChainTimes: curChainTimes,
-    //         consumerStatus: consumerStatus,
-    //         outstandingPacketsToProvider: outstandingPacketsToProvider,
-    //         outstandingPacketsToConsumer: outstandingPacketsToConsumer,
-    //         maturationTimes: maturationTimes,
-    //         receivedMaturations: receivedMaturations,
-    //         sentVSCPackets: sentVSCPackets,
-    //     }
-
-    // // set of identifiers of potential nodes
-    // pure val Nodes: Set[Node] = 
-    //     Set("A", "B", "C", "D", "E", "F", "G", "H", "I", "J")
-
-    // // the set of consumer chains
-    // pure val ConsumerChains: Set[Chain] = 
-    //     Set("chain1", "chain2", "chain3")
-
-    // // The singular provider chain.
-    // pure val ProviderChain: Chain = 
-    //     "provider"
-        
-    // pure val chains = ConsumerChains.union(Set(ProviderChain))
-
-    // // length of the unbonding period on each chain
-    // pure val UnbondingPeriod: Chain -> int = chains.mapBy(
-    //     (chain) => 
-    //     10
-    // )
-
-    // // the time until a packet times out
-    // pure val PacketTimeout: int = 
-    //     5
-
-    // // the time until a consumer chain is dropped by the provider due to inactivity
-    // pure val InactivityTimeout: int =
-    //     10
-
-    // // utility: a map assigning each chain to 0, used for not advancing timestamps
-    // pure val NoTimeAdvancement: Chain -> int = chains.mapBy(
-    //     (chain) => 
-    //     0
-    // )
-
-
-    // // utility: a map assigning each chain to false, used for not advancing consumer status
-    // pure val NoStatusAdvancement: Chain -> bool = chains.mapBy(
-    //     (chain) => 
-    //     false
-    // )
 }
diff --git a/tests/difference/core/quint_model/extraSpells.qnt b/tests/difference/core/quint_model/extraSpells.qnt
index 5c98f7a384..cd2105beb7 100644
--- a/tests/difference/core/quint_model/extraSpells.qnt
+++ b/tests/difference/core/quint_model/extraSpells.qnt
@@ -1,3 +1,4 @@
+-*- mode: Bluespec; -*-
 // This module is just a library with utility functions (sometimes called spells in Quint).
 module extraSpells {
 
diff --git a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123337-6230.fail b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123337-6230.fail
deleted file mode 100644
index f2c09a9e15..0000000000
--- a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123337-6230.fail
+++ /dev/null
@@ -1,18 +0,0 @@
-# 2023/09/12 12:33:37 TestActionMarshalling [rapid] draw Action: main.StartChainAction{Chain:"", Validators:[]main.StartChainValidator{}, GenesisChanges:"", SkipGentx:false}
-# 2023/09/12 12:33:37 TestActionMarshalling error marshalling and unmarshalling chain state:   any(
-# - 	main.StartChainAction{Validators: []main.StartChainValidator{}},
-# + 	map[string]any{
-# + 		"Chain":          string(""),
-# + 		"GenesisChanges": string(""),
-# + 		"SkipGentx":      bool(false),
-# + 		"Validators":     []any{},
-# + 	},
-#   )
-# 
-v0.4.8#6863100771198181688
-0x0
-0x1
-0x0
-0x0
-0x0
-0x0
\ No newline at end of file
diff --git a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123517-6794.fail b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123517-6794.fail
deleted file mode 100644
index 9547963143..0000000000
--- a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123517-6794.fail
+++ /dev/null
@@ -1,14 +0,0 @@
-# 2023/09/12 12:35:17 TestActionMarshalling [rapid] draw Action: main.SendTokensAction{Chain:"", From:"", To:"", Amount:0x0}
-# 2023/09/12 12:35:17 TestActionMarshalling error marshalling and unmarshalling action: got (+), want (-):   any(
-# - 	main.SendTokensAction{},
-# + 	map[string]any{"Amount": float64(0), "Chain": string(""), "From": string(""), "To": string("")},
-#   )
-# 
-v0.4.8#14250065908211800578
-0x0
-0x0
-0x0
-0x0
-0x0
-0x0
-0x0
\ No newline at end of file
diff --git a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123556-6970.fail b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123556-6970.fail
deleted file mode 100644
index 4ddf365f5c..0000000000
--- a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123556-6970.fail
+++ /dev/null
@@ -1,14 +0,0 @@
-# 2023/09/12 12:35:56 TestActionMarshalling [rapid] draw Action: main.SendTokensAction{Chain:"", From:"", To:"", Amount:0x0}
-# 2023/09/12 12:35:56 TestActionMarshalling error marshalling and unmarshalling action: got (-), want (+):   any(
-# - 	main.SendTokensAction{},
-# + 	map[string]any{"Amount": float64(0), "Chain": string(""), "From": string(""), "To": string("")},
-#   )
-# 
-v0.4.8#9176735344445930654
-0x0
-0x0
-0x0
-0x0
-0x0
-0x0
-0x0
\ No newline at end of file
diff --git a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123609-7116.fail b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123609-7116.fail
deleted file mode 100644
index 89dcbcc8b2..0000000000
--- a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123609-7116.fail
+++ /dev/null
@@ -1,18 +0,0 @@
-# 2023/09/12 12:36:09 TestActionMarshalling [rapid] draw Action: main.StartChainAction{Chain:"", Validators:[]main.StartChainValidator{}, GenesisChanges:"", SkipGentx:false}
-# 2023/09/12 12:36:09 TestActionMarshalling error marshalling and unmarshalling action: got (-), want (+):   any(
-# - 	main.StartChainAction{Validators: []main.StartChainValidator{}},
-# + 	map[string]any{
-# + 		"Chain":          string(""),
-# + 		"GenesisChanges": string(""),
-# + 		"SkipGentx":      bool(false),
-# + 		"Validators":     []any{},
-# + 	},
-#   )
-# 
-v0.4.8#17927886955469684979
-0x0
-0x1
-0x0
-0x0
-0x0
-0x0
\ No newline at end of file
diff --git a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123822-8026.fail b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123822-8026.fail
deleted file mode 100644
index d2493d87a3..0000000000
--- a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230912123822-8026.fail
+++ /dev/null
@@ -1,8 +0,0 @@
-# 2023/09/12 12:38:22 TestActionMarshalling [rapid] draw Action: main.addChainToRelayerAction{Chain:"", Validator:""}
-# 2023/09/12 12:38:22 TestActionMarshalling error marshalling and unmarshalling action: error unmarshalling action inside step: unknown action name: main.addChainToRelayerAction
-# 
-v0.4.8#17613601115647214278
-0x9867f1f40f739
-0x9
-0x0
-0x0
\ No newline at end of file
diff --git a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151826-12656.fail b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151826-12656.fail
deleted file mode 100644
index 10fd2ac639..0000000000
--- a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151826-12656.fail
+++ /dev/null
@@ -1,8 +0,0 @@
-# 2023/09/13 15:18:26 TestActionMarshalling [rapid] draw Action: main.lightClientEquivocationAttackAction{Validator:"", Chain:""}
-# 2023/09/13 15:18:26 TestActionMarshalling error marshalling and unmarshalling action: error unmarshalling action inside step: unknown action name: main.lightClientEquivocationAttackAction
-# 
-v0.4.8#7694661539125204314
-0xc05c654ab866b
-0x1f
-0x0
-0x0
\ No newline at end of file
diff --git a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151917-13146.fail b/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151917-13146.fail
deleted file mode 100644
index 6fb9bfa9f7..0000000000
--- a/tests/e2e/testdata/rapid/TestActionMarshalling/TestActionMarshalling-20230913151917-13146.fail
+++ /dev/null
@@ -1,8 +0,0 @@
-# 2023/09/13 15:19:17 TestActionMarshalling [rapid] draw Action: main.lightClientLunaticAttackAction{Validator:"", Chain:""}
-# 2023/09/13 15:19:17 TestActionMarshalling error marshalling and unmarshalling action: error unmarshalling action inside step: unknown action name: main.lightClientLunaticAttackAction
-# 
-v0.4.8#10796173543550944397
-0x1f2b5a0e61c3a6
-0x0
-0x0
-0x0
\ No newline at end of file
diff --git a/tests/e2e/testdata/rapid/TestReadAndWriteTrace/TestReadAndWriteTrace-20230913151920-13146.fail b/tests/e2e/testdata/rapid/TestReadAndWriteTrace/TestReadAndWriteTrace-20230913151920-13146.fail
deleted file mode 100644
index f8e2127feb..0000000000
--- a/tests/e2e/testdata/rapid/TestReadAndWriteTrace/TestReadAndWriteTrace-20230913151920-13146.fail
+++ /dev/null
@@ -1,11 +0,0 @@
-# 2023/09/13 15:19:20 TestReadAndWriteTrace [rapid] draw Trace: []main.Step{main.Step{Action:main.lightClientEquivocationAttackAction{Validator:"", Chain:""}, State:main.State{}}}
-# 2023/09/13 15:19:20 TestReadAndWriteTrace error writing and reading trace: error reading trace from file: unknown action name: main.lightClientEquivocationAttackAction
-# 
-v0.4.8#17668525343613541116
-0x5555555555555
-0xc05c654ab866b
-0x1f
-0x0
-0x0
-0x0
-0x0
\ No newline at end of file

From c05d9e682e055f458d64977c6da8917b5ba0c802 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Mon, 18 Sep 2023 18:24:33 +0200
Subject: [PATCH 13/80] Start rewriting quint model

---
 tests/difference/core/quint_model/ccv.qnt     | 1241 +++++++++--------
 .../core/quint_model/extraSpells.qnt          |    1 -
 2 files changed, 691 insertions(+), 551 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index d18930ae1d..4cbc327ac4 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -1,5 +1,4 @@
--*- mode: Bluespec; -*-
-module ccv {
+module ccv_logic {
     import extraSpells.* from "./extraSpells"
 
     // Things that are not modelled:
@@ -12,12 +11,17 @@ module ccv {
     // * VSC packets mature
     // * Consumers can be forcefully dropped due to timeouts, or stop on their own volition
     
+    // ===================
     // TYPE DEFINITIONS
+    // ===================
     type Node = str
     type Chain = str
-    type ValidatorSet = Node -> int
+    type Power = int
+    type ValidatorSet = Node -> Power
     type Height = int
     type Timestamp = int
+    // a list of validator sets per blocks, ordered by recency
+    type VotingPowerHistory = List[ValidatorSet]
 
     // --PACKETS
     type VSCPacket =
@@ -38,582 +42,719 @@ module ccv {
             timeout: Timestamp
         }
     
-    // MODEL PARAMETERS
-        
-
-    // set of identifiers of potential nodes
-    pure val Nodes: Set[Node] = 
-        Set("A", "B", "C", "D", "E", "F", "G", "H", "I", "J")
-
-    // the set of consumer chains
-    pure val ConsumerChains: Set[Chain] = 
-        Set("chain1", "chain2", "chain3")
+    // possible consumer statuses
+    pure val STOPPED = "stopped" // the chain was once a consumer chain, but has been dropped by the provider.
+    pure val RUNNING = "running" // the chain is currently a consumer chain. Running chains are those that get sent VSCPackets.
+    pure val UNUSED = "unused" // the chain has never been a consumer chain, and is available to become one.
+    // When a chain is dropped, it cannot become a consumer again - we assume that would be done by another consumer becoming running.
+
+
+    // state that each chain needs to store, whether consumer or provider.
+    type ChainState = {
+        // Stores the list of voting powers that corresponded to voting powers 
+        // at blocks over the chains entire existence.
+        // Voting powers should be ordered by recency in descending order.
+        votingPowerHistory: VotingPowerHistory,
+
+        // the current validator set on each chain.
+        // this will be included in the next block, but might not be final yet,
+        // e.g. there may be more modifications in the current block.
+        currentValidatorSet: ValidatorSet,
+
+        // the latest timestamp that was comitted on chain
+        lastTimestamp: Timestamp,
+    }
 
-    // The singular provider chain.
-    pure val ProviderChain: Chain = 
-        "provider"
-        
-    pure val chains = ConsumerChains.union(Set(ProviderChain))
-
-    // length of the unbonding period on each chain
-    pure val UnbondingPeriod: Chain -> int = chains.mapBy(
-        (chain) => 
-        10
-    )
-
-    // the time until a packet times out
-    pure val PacketTimeout: int = 
-        5
-
-    // the time until a consumer chain is dropped by the provider due to inactivity
-    pure val InactivityTimeout: int =
-        10
-
-    // consumer statuses
-    pure val STOPPED = "stopped"
-    pure val RUNNING = "running"
-    pure val UNUSED = "unused"
-
-    // utility: a map assigning each chain to 0, used for not advancing timestamps
-    pure val NoTimeAdvancement: Chain -> int = chains.mapBy(
-        (chain) => 
-        0
-    )
-
-    // utility: a struct summarizing the current state
-    val state = 
+    // Defines the current state of the provider chain. Essentially, all information here is stored by the provider on-chain (or could be derived purely by information that is on-chain).
+    type ProviderState =
         {
-            votingPowerHistories: votingPowerHistories,
-            runningValidatorSet: runningValidatorSet,
-            curChainTimes: curChainTimes,
-            consumerStatus: consumerStatus,
-            outstandingPacketsToProvider: outstandingPacketsToProvider,
-            outstandingPacketsToConsumer: outstandingPacketsToConsumer,
-            maturationTimes: maturationTimes,
-            receivedMaturations: receivedMaturations,
-            sentVSCPackets: sentVSCPackets,
-        }
-
-
-    // utility: a map assigning each chain to false, used for not advancing consumer status
-    pure val NoStatusAdvancement: Chain -> bool = chains.mapBy(
-        (chain) => 
-        false
-    )
-
-    // utility: the set of consumers currently running
-    val RunningConsumers: Set[Chain] = 
-        ConsumerChains.filter(chain => consumerStatus.get(chain) == RUNNING)
-
-    // MODEL STATE
-    // --SHARED STATE
-
-    // Stores, for each chain, the list of voting powers that corresponded to voting powers 
-    // at blocks over its entire existence.
-    // Voting powers should be ordered by recency in descending order.
-    var votingPowerHistories: Chain -> List[ValidatorSet]
-
-    // the current validator set on each chain.
-    // this will be included in the next block, but might not be final yet,
-    // e.g. there may be more modifications in the current block.
-    var runningValidatorSet: Chain -> ValidatorSet
-
-    // the current timestamp for each chain
-    var curChainTimes: Chain -> Timestamp
-
-    // stores, for each chain, its current status -
-    // unused, running, or stopped
-    var consumerStatus: Chain -> str
-
-    // --CHANNELS
-    // Stores, for each consumer chain, the list of packets that have been sent to the provider chain
-    // and have not been received yet.
-    var outstandingPacketsToProvider: Chain -> List[VSCMaturedPacket]
+            // the state that each chain needs to store
+            chainState: ChainState,
 
-    // Stores, for each consumer chain, the list of packets that have been sent to the consumer chain
-    // and have not been received yet.
-    var outstandingPacketsToConsumer: Chain -> List[VSCPacket]
+            // Stores, for each consumer chain, the list of packets that have been sent to the consumer chain
+            // and have not been received yet.
+            // In the implementation, this would roughly be the unacknowledged packets on an ibc channel.
+            outstandingPacketsToConsumer: Chain -> List[VSCPacket],
 
+            // the set of received VSCMaturedPackets
+            receivedMaturations: Set[VSCMaturedPacket],
 
-    // --CONSUMER STATE
-    // Stores the maturation times for VSCPackets received by consumers
-    var maturationTimes: Chain -> (VSCPacket -> Timestamp)
+            // stores which VSC Packets have been sent to compare with receivedMaturations to detect timeouts due to non-responsiveness
+            sentVSCPackets: Chain -> Set[VSCPacket],
 
-    // --PROVIDER STATE
-    // the set of VSCMaturedPackets received by the provider chain
-    var receivedMaturations: Set[VSCMaturedPacket]
-
-    // stores which VSC Packets have been sent to compare with receivedMaturations to detect timeouts due to non-responsiveness
-    var sentVSCPackets: Chain -> Set[VSCPacket]
-
-    // stores whether, in this step, the validator set considered to be changed.
-    // this is needed because the validator set might be considered to have changed, even though
-    // it is still technically identical at our level of abstraction, e.g. a validator power change on the provider
-    // might leave the validator set the same because a delegation and undelegation cancel each other out.
-    var providerValidatorSetChangedInThisBlock: bool
-
-
-    // UTILITY FUNCTIONS & ACTIONS
-    def wasValidatorSetOnProvider(validatorSet: ValidatorSet): bool = {
-        votingPowerHistories.get(ProviderChain).toSet().exists(
-            historicalValSet => historicalValSet == validatorSet
-        )
-    }
-
-    def getCurrentValidatorSet(chain: Chain): ValidatorSet = 
-        votingPowerHistories.get(chain).head()
-
-    def getUpdatedValidatorSet(oldValidatorSet: ValidatorSet, validator: Node, newVotingPower: int): ValidatorSet =
-        if (newVotingPower > 0) 
-        oldValidatorSet.put(validator, newVotingPower)
-        else
-        oldValidatorSet.mapRemove(validator)
-
-    // returns true if the consumer has timed out and should be dropped
-    def consumerTimedOut(consumer: Chain): bool =
-        any {
-            // either a package from provider to consumer has timed out
-            outstandingPacketsToConsumer.get(consumer).select(
-                packet => packet.timeout <= curChainTimes.get(consumer)
-            ).length() > 0,
-            // or a package from consumer to provider has timed out
-            outstandingPacketsToProvider.get(consumer).select(
-                packet => packet.timeout <= curChainTimes.get(ProviderChain)
-            ).length() > 0,
-            // or the inactivity timeout has passed since a VSCPacket was sent to the consumer, but the
-            // provider has not received a VSCMaturedPacket for it
-            val packetsWithoutResponse = sentVSCPackets.get(consumer).filter( // get packets without response
-                packet => 
-                not(receivedMaturations.exists(
-                    maturedPacket => maturedPacket.id == packet.id
-                ))
-            )
-            // among those, get packets where inactivity timeout has passed
-            packetsWithoutResponse.filter(
-                packet => 
-                val sentAt = curChainTimes.get(ProviderChain) - PacketTimeout // compute when the packet was sent
-                val timesOutAt = sentAt + InactivityTimeout // compute when the packet times out
-                timesOutAt <= curChainTimes.get(ProviderChain)
-            ).size() > 0
-        }
-
-    // utility action that leaves all provider state untouched
-    action PROVIDER_NOOP(): bool = 
-        all {
-            receivedMaturations' = receivedMaturations,
-        }
+            // stores whether, in this block, the validator set has changed.
+            // this is needed because the validator set might be considered to have changed, even though
+            // it is still technically identical at our level of abstraction, e.g. a validator power change on the provider
+            // might leave the validator set the same because a delegation and undelegation cancel each other out.
+            providerValidatorSetChangedInThisBlock: bool,
 
-    // utility action that leaves all consumer state untouched
-    action CONSUMER_NOOP(): bool = 
-        all {
-            maturationTimes' = maturationTimes,
+            // stores, for each consumer chain, its current status -
+            // unused, running, or stopped
+            consumerStatus: Chain -> str,
         }
-    
 
-    // MODEL ACTIONS
+    // Defines the current state of a consumer chain. This information is accessible to that consumer on-chain.
+    type ConsumerState = {
+        // the state that each chain needs to store
+        chainState: ChainState,
 
-    // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
-    // e.g. via undelegations, or delegations, ...
-    action votingPowerChange(validator: Node, amount: int): bool =
-        // for the provider chain, we need to adjust the voting power history
-        // by adding a new set
-        all {
-            amount >= 0,
-            val newValidatorSet = getCurrentValidatorSet(ProviderChain).getUpdatedValidatorSet(validator, amount)
-            // set the running validator set on the provider chain, but don't update the history yet
-            runningValidatorSet' = runningValidatorSet.set(ProviderChain, newValidatorSet),
-            // no packets are sent yet, these are only sent on endAndBeginBlock
-            RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-            outstandingPacketsToProvider' = outstandingPacketsToProvider,
-            receivedMaturations' = receivedMaturations,
-            CONSUMER_NOOP,
-            // voting power history is only updated on endAndBeginBlock
-            votingPowerHistories' = votingPowerHistories,
-            // consumer statusses do not change
-            consumerStatus' = consumerStatus,
-            // chain times do not change
-            curChainTimes' = curChainTimes,
-            // the validator set is considered to have changed
-            providerValidatorSetChangedInThisBlock' = true,
-        }
+        // Stores the maturation times for VSCPackets received by this consumer
+        maturationTimes: VSCPacket -> Timestamp,
 
-    // deliver the next outstanding packet from the consumer to the provider.
-    // since this model assumes a single provider chain, this just takes a single chain as argument.
-    action recvPacketOnProvider(consumer: Chain): bool = all {
-        // ensure there is a packet to be received
-        outstandingPacketsToProvider.get(consumer).length() > 0,
-        // remove packet from outstanding packets
-        val newPacketQueue = outstandingPacketsToProvider.get(consumer).tail()
-        outstandingPacketsToProvider' = outstandingPacketsToProvider.set(consumer, newPacketQueue),
-        // register the packet as received
-        val maturedPacket = outstandingPacketsToProvider.get(consumer).head()
-        receivedMaturations' = receivedMaturations.add(maturedPacket),
-        CONSUMER_NOOP,
-        RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-        votingPowerHistories' = votingPowerHistories,
-        // no validator set changes are made
-        runningValidatorSet' = runningValidatorSet,
-        // consumer statusses do not change
-        consumerStatus' = consumerStatus,
-        // chain times do not change
-        curChainTimes' = curChainTimes,
-        // the validator set was not changed by this action (but might have been changed before in this block)
-        providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
-    }
+        // Stores the list of packets that have been sent to the provider chain by this consumer
+        // and have not been received yet.
+        // In the implementation, essentially unacknowledged IBC packets.
+        outstandingPacketsToProvider: Chain -> List[VSCMaturedPacket],
 
-    // deliver the next outstanding packet from the provider to the consumer.
-    // since this model assumes a single provider chain, this just takes a single chain as argument.
-    action recvPacketOnConsumer(consumer: Chain): bool = all {
-        // ensure there is a packet to be received
-        outstandingPacketsToConsumer.get(consumer).length() > 0,
-        // remove packet from outstanding packets
-        val newPacketQueue = outstandingPacketsToConsumer.get(consumer).tail()
-        val newOutstandingPackets = outstandingPacketsToConsumer.set(consumer, newPacketQueue)
-        RegisterNewOutstandingPackets(newOutstandingPackets),
-        val packet = outstandingPacketsToConsumer.get(consumer).head()
-        all {
-            // update the running validator set, but not the history yet,
-            // as that only happens when the next block is started
-            runningValidatorSet' = runningValidatorSet.set(consumer, packet.validatorSet),
-            // add the new packet and store its maturation time
-            val newMaturationTimes = maturationTimes.get(consumer).put(packet, curChainTimes.get(consumer) + UnbondingPeriod.get(consumer))
-            maturationTimes' = maturationTimes.set(consumer, newMaturationTimes)
-        },
-        PROVIDER_NOOP,
-        votingPowerHistories' = votingPowerHistories,
-        outstandingPacketsToProvider' = outstandingPacketsToProvider,
-        // consumer statusses do not change
-        consumerStatus' = consumerStatus,
-        // chain times do not change
-        curChainTimes' = curChainTimes,
-        // the validator set was not changed by this action (but might have been changed before in this block)
-        providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+        // Stores the list of voting powers that corresponded to voting powers 
+        // at blocks over the chains entire existence.
+        // Voting powers should be ordered by recency in descending order.
+        votingPowerHistory: VotingPowerHistory,
     }
 
-    // ends the current block and starts the next block for a given chain.
-    action endAndBeginBlock(chain: Chain): bool = any {
-        all {
-          chain == ProviderChain,
-          endAndBeginBlockForProvider,
-        },
-        all {
-            chain != ProviderChain,
-            endAndBeginBlockForConsumer(chain),
-        }
+    // the state of the protocol consists of the composition of the state of one provider chain with potentially many consumer chains.
+    type ProtocolState = {
+        providerState: ProviderState,
+        // the state of each consumer chain.
+        // note that we assume that this contains all consumer chains that may ever exist,
+        // and consumer chains that are currently not running will have providerState.consumerStatus == UNUSED or STOPPED
+        consumerStates: Set[ConsumerState]
     }
 
-    // gets the updated history for the current chain when ending a block, i.e. the
-    // running validator set is added to the history if different from the last one.
-    def getUpdatedHistory(chain: Chain): List[ValidatorSet] =
-        // update voting power history if the validator set changed
-        val newValidatorSet = runningValidatorSet.get(ProviderChain)
-        val oldValidatorSet = votingPowerHistories.get(ProviderChain).head()
-        if (newValidatorSet != oldValidatorSet) 
-            votingPowerHistories.get(ProviderChain).prepend(newValidatorSet)
-        else
-            votingPowerHistories.get(ProviderChain)
-
-
-    action endAndBeginBlockForProvider(): bool = all {
-        // update the voting power history
-        votingPowerHistories' = votingPowerHistories.set(ProviderChain, getUpdatedHistory(ProviderChain)),
-        // the running validator set is now for sure the current validator set,
-        // so start with it in the next block
-        runningValidatorSet' = runningValidatorSet,
-        // send VSCPackets to consumers
-        val newOutstandingPackets = 
-            // if running validator set is considered to have changed
-            if (providerValidatorSetChangedInThisBlock)
-                // then send a packet to each running consumer
-                outstandingPacketsToConsumer.keys().mapBy(
-                    (consumer) => 
-                    val packetQueue = outstandingPacketsToConsumer.get(consumer)
-                    if (consumerStatus.get(consumer) == RUNNING) {
-                        packetQueue.append(
-                            {
-                                id: packetQueue.length(),
-                                validatorSet: runningValidatorSet.get(ProviderChain),
-                                timeout: curChainTimes.get(ProviderChain) + PacketTimeout
-                            }
-                        )
-                    } else {
-                        packetQueue
-                    }
-                )
-            else
-                // otherwise, don't send any packets
-                outstandingPacketsToConsumer
-        RegisterNewOutstandingPackets(newOutstandingPackets),
-        CONSUMER_NOOP,
-        // no packets are sent to the provider
-        outstandingPacketsToProvider' = outstandingPacketsToProvider,
-        // do not receive any maturations
-        receivedMaturations' = receivedMaturations,
-        // consumer statusses do not change
-        consumerStatus' = consumerStatus,
-        // chain times do not change
-        curChainTimes' = curChainTimes,
-        // the validator set was definitely not changed in the new block yet, so set to false
-        providerValidatorSetChangedInThisBlock' = false
+    type Error = {
+        message: str
     }
 
-    action endAndBeginBlockForConsumer(consumer: Chain): bool = all {
-        ConsumerChains.contains(consumer),
-        // update the voting power history
-        votingPowerHistories' = votingPowerHistories.set(consumer, getUpdatedHistory(consumer)),
-        // the running validator set is now for sure the current validator set,
-        // so start with it in the next block
-        runningValidatorSet' = runningValidatorSet,
-        // compute mature packets whose maturation time has passed
-        val maturedPackets = maturationTimes.get(consumer).keys().filter(
-            packet => 
-            val maturationTime = maturationTimes.get(consumer).get(packet)
-            maturationTime <= curChainTimes.get(consumer)
-        )
-        all {
-            // remove matured packets from the maturation times
-            maturationTimes' = maturationTimes.set(consumer, maturationTimes.get(consumer).mapRemoveAll(maturedPackets)),
-            // send matured packets
-            outstandingPacketsToProvider' = outstandingPacketsToProvider.set(
-                consumer, 
-                // construct VSCMaturedPackets from the matured VSCPackets
-                outstandingPacketsToProvider.get(consumer).concat(
-                    maturedPackets.map(packet => {id: packet.id, timeout: 5}).toList()
-                )
-            )
-        },
-        PROVIDER_NOOP,
-        // no packets are sent to consumer or received by it
-        RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-        // consumer statusses do not change
-        consumerStatus' = consumerStatus,
-        // chain times do not change
-        curChainTimes' = curChainTimes,
-        // the validator set was not changed by this action (but might have been changed before in this block)
-        // also, this is only a new block for a consumer, so the change variable shouldn't be reset
-        providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+    // we return either a result or an error.
+    // if hasError is true, newState may be arbitrary, but the error will be meaningful.
+    // if hasError is false, error may be arbitrary, but newState will be meaningful.
+    type Result = {
+        hasError: bool,
+        newState: ProtocolState,
+        error: Error
     }
 
-    // advance timestamps for maps nondeterministically
-    action AdvanceTime(): bool = 
-            val advanceAmounts = curChainTimes.keys().mapBy(
-                chain =>    
-                nondet amount = oneOf(1.to(10))
-                amount
-            )
-            AdvanceTimeByMap(advanceAmounts)
-
-    // the timestamp for each chain is advanced by the given amount
-    action AdvanceTimeByMap(advancementAmount: Chain -> int): bool = all
+    pure def Ok(newState: ProtocolState): Result = {
         {
-            curChainTimes' = curChainTimes.keys().mapBy(
-                chain => 
-                curChainTimes.get(chain) + advancementAmount.get(chain)
-            ),
-            // all other variables are left untouched
-            votingPowerHistories' = votingPowerHistories,
-            runningValidatorSet' = runningValidatorSet,
-            outstandingPacketsToProvider' = outstandingPacketsToProvider,
-            RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-            receivedMaturations' = receivedMaturations,
-            maturationTimes' = maturationTimes,
-            // chain times do not change
-            consumerStatus' = consumerStatus,
-            // the validator set was not changed by this action (but might have been changed before in this block)
-            providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
-        }
-
-    // each consumer chain may advance in the order
-    // some events may necessitate a transition, e.g. timeouts.
-    // shouldAdvance gives, for each consumer chain, whether it should advance if possible.
-    // if a chain has to advance, e.g. due to timeouts, or may not advance, the value will have no effect.
-    action AdvanceConsumers(shouldAdvance: Chain -> bool): bool = 
-        val newConsumerStatus = consumerStatus.keys().mapBy(
-            chain => 
-            val curStatus = consumerStatus.get(chain)
-            if (curStatus == UNUSED) {
-                if (shouldAdvance.get(chain))
-                {
-                    RUNNING
-                } else {
-                    UNUSED
-                }
-            }
-            else if (curStatus == RUNNING) {
-                // the chain may transition to stopped.
-                // it is *forced* to stop if a packet timed out,
-                // or if the inactivity timeout has passed
-                if(consumerTimedOut(chain)) {
-                    STOPPED
-                } else {
-                    if (shouldAdvance.get(chain)) {
-                        RUNNING
-                    } else {
-                        STOPPED
-                    }
-                }
-            } else {
-                // stopped chains cannot restart, we assume a new chain would be started in that case
-                STOPPED
+            hasError: false,
+            newState: newState,
+            error: {
+                message: ""
             }
-            )
-        all {
-            consumerStatus' = newConsumerStatus,
-            // all other variables are left untouched
-            votingPowerHistories' = votingPowerHistories,
-            runningValidatorSet' = runningValidatorSet.keys().mapBy(
-                chain => 
-                if (newConsumerStatus.get(chain) == RUNNING and consumerStatus.get(chain) == UNUSED) 
-                // consumers that went from unused to running start with the current validator set on the provider
-                { 
-                    runningValidatorSet.get(ProviderChain) 
-                } else {
-                    runningValidatorSet.get(chain)
-                }
-            ),
-            outstandingPacketsToProvider' = outstandingPacketsToProvider,
-            RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-            receivedMaturations' = receivedMaturations,
-            maturationTimes' = maturationTimes,
-            // chain times do not change
-            curChainTimes' = curChainTimes,
-            // the validator set was not changed by this action (but might have been changed before in this block)
-            providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
         }
+    }
 
-    // Updates the outstandingPacketsToConsumer and sentVSCPackets variables
-    action RegisterNewOutstandingPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
-        all {
-            outstandingPacketsToConsumer' = newOutstandingPackets,
-            StoreSentPackets(newOutstandingPackets),
+    pure def Err(msg: str): Result = {
+        {
+            hasError: true,
+            newState: {
+                providerState: {
+                    chainState: {
+                        votingPowerHistory: List(),
+                        currentValidatorSet: Map(),
+                        lastTimestamp: 0
+                    },
+                    outstandingPacketsToConsumer: Map(),
+                    receivedMaturations: Set(),
+                    sentVSCPackets: Map(),
+                    providerValidatorSetChangedInThisBlock: false,
+                    consumerStatus: Map()
+                },
+                consumerStates: Set()
+            },
+            error: {
+                message: msg
+            }
         }
+    }
 
+    // ===================
+    // PROTOCOL LOGIC
+    // ===================
 
-    // stores the VSCPackets sent in this step in sentVSCPackets
-    action StoreSentPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
-        sentVSCPackets' = sentVSCPackets.keys().mapBy(
-            (chain) => 
-            sentVSCPackets.get(chain).union(newOutstandingPackets.get(chain).toSet())
-        )
-
+    pure def getUpdatedValidatorSet(oldValidatorSet: ValidatorSet, validator: Node, newVotingPower: int): ValidatorSet =
+        if (newVotingPower > 0) 
+        oldValidatorSet.put(validator, newVotingPower)
+        else
+        oldValidatorSet.mapRemove(validator)
     
-    // the main step action 
-    action step: bool = any {
-        AdvanceTime,
-        nondet node = oneOf(Nodes)
-        nondet amount = oneOf(1.to(10))
-        votingPowerChange(node, amount),
-        recvPacketOnProvider(oneOf(ConsumerChains)),
-        recvPacketOnConsumer(oneOf(ConsumerChains)),
-        nondet chain = oneOf(chains)
-        endAndBeginBlock(chain),
-        val shouldAdvance = ConsumerChains.mapBy(
-            chain => 
-            nondet should = oneOf(Set(true, false))
-            should
-        )
-        AdvanceConsumers(shouldAdvance),
-    }
-
-    pure val nodePowerSet = Nodes.powerset()
-
-    def getArbitraryValidatorSet(): ValidatorSet = 
-        nondet numValidators = oneOf(1.to(Nodes.size()))
-        // toList has nondeterministic behaviour, so this gets arbitrary validators
-        nondet validators = oneOf(nodePowerSet.filter(s => s.size() == numValidators))
-        validators.mapBy(
-            validator => 
-            nondet votingPower = oneOf(1.to(10))
-            votingPower
-        )
-
-    // INITIALIZATION
-    action init: bool = 
-    all {
-        val validatorSets = chains.mapBy(
-            (chain) => 
-        // provider chain gets an arbitrary validator set, consumer chains have none
-            if (chain == ProviderChain) getArbitraryValidatorSet else Map()
-        )
-        all {
-            votingPowerHistories' = chains.mapBy(
-                (chain) => 
-                List(validatorSets.get(chain))
-            ),
-            runningValidatorSet' = validatorSets,
-        },
-        // each chain starts at time 0
-        curChainTimes' = chains.mapBy(
-            (chain) => 0
-        ),
-        // all consumer chains are unused
-        consumerStatus' = chains.mapBy(chain => UNUSED),
-        // no packets are outstanding
-        outstandingPacketsToProvider' = chains.mapBy(chain => List()),
-        outstandingPacketsToConsumer' = chains.mapBy(chain => List()),
-        // no maturations have been received by provider
-        receivedMaturations' = Set(),
-        // no packets have been sent to consumers
-        sentVSCPackets' = chains.mapBy(chain => Set()),
-        // no packets have been received by consumers, so no maturation times set
-        maturationTimes' = chains.mapBy(chain => Map()),
-        // validator set was not changed yet
-        providerValidatorSetChangedInThisBlock' = false
-    }
+    // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
+    // e.g. via undelegations, or delegations, ...
+    pure def votingPowerChange(currentState: ProtocolState, validator: Node, amount: int): Result =
+            // adjust the current validator set on the provider - it is not entered in the voting history yet because that happens only on block end
+            val currentValidatorSet = currentState.providerState.currentValidatorSet
+            // val newValidatorSet = getUpdatedValidatorSet(currentValidatorSet, validator, amount)
+            // val newProviderState = currentState.providerState.with(
+            //     "currentValidatorSet", newValidatorSet
+            // )
+            // val newState = currentState.with(
+            //     "providerState", newProviderState
+            // )
+            Err("not implemented")
+}
 
-    // PROPERTIES
-
-    // Every validator set on any consumer chain MUST either be or
-    // have been a validator set on the provider chain.
-    val ValidatorSetReplication: bool = 
-        chains.forall(
-            chain => chain.getCurrentValidatorSet().wasValidatorSetOnProvider()
-        )
-
-    // TESTS
-    run VSCHappyPathTest: bool = {
-        init
-        // trigger a votingPowerChange on the provider chain
-        .then(votingPowerChange("A", 10))
-        // endAndBeginBlock on provider. No consumer chains are running, so no packets are sent
-        .then(endAndBeginBlock(ProviderChain))
-        .then(all {
-            // no packet was sent
-            assert(outstandingPacketsToConsumer.get("chain1").length() == 0),
-            // advance chain1 to running
-            AdvanceConsumers(NoStatusAdvancement.set("chain1", true))
-        })
-        // consumer chain should have current validator set from provider
-        .then(
-            all { 
-                // since consumer chain just started, its assumed to have the validator set from provider
-                assert(runningValidatorSet.get("chain1") == runningValidatorSet.get(ProviderChain)),
-                // trigger a votingPowerChange on the provider chain
-                votingPowerChange("B", 10)
-            }
-        )
-        .then(
-            val valSet = runningValidatorSet.get(ProviderChain)
-            endAndBeginBlock(ProviderChain)
-            // now the provider should send a packet on block end
-            .then(all {
-                // a packet was sent
-                assert(outstandingPacketsToConsumer.get("chain1").length() == 1),
-                // deliver the packet to the consumer
-                recvPacketOnConsumer("chain1")
-            })
-            .then(
-                // consumer needs to end a block before it has the new validator set
-                endAndBeginBlock("chain1")
-            )
-            .then(all {
-                // the consumer should have the new validator set
-                assert(runningValidatorSet.get("chain1") == valSet),
-                // put a last action to satisfy the action effect
-                AdvanceConsumers(NoStatusAdvancement)
-            })
-        )
-    }
+module ccv_tests {
+    import ccv_logic.*
+
+    // // UTILITY FUNCTIONS & ACTIONS
+    // def wasValidatorSetOnProvider(validatorSet: ValidatorSet): bool = {
+    //     votingPowerHistories.get(ProviderChain).toSet().exists(
+    //         historicalValSet => historicalValSet == validatorSet
+    //     )
+    // }
+
+    // def getCurrentValidatorSet(chain: Chain): ValidatorSet = 
+    //     votingPowerHistories.get(chain).head()
+
+    // // returns true if the consumer has timed out and should be dropped
+    // def consumerTimedOut(consumer: Chain): bool =
+    //     any {
+    //         // either a package from provider to consumer has timed out
+    //         outstandingPacketsToConsumer.get(consumer).select(
+    //             packet => packet.timeout <= curChainTimes.get(consumer)
+    //         ).length() > 0,
+    //         // or a package from consumer to provider has timed out
+    //         outstandingPacketsToProvider.get(consumer).select(
+    //             packet => packet.timeout <= curChainTimes.get(ProviderChain)
+    //         ).length() > 0,
+    //         // or the inactivity timeout has passed since a VSCPacket was sent to the consumer, but the
+    //         // provider has not received a VSCMaturedPacket for it
+    //         val packetsWithoutResponse = sentVSCPackets.get(consumer).filter( // get packets without response
+    //             packet => 
+    //             not(receivedMaturations.exists(
+    //                 maturedPacket => maturedPacket.id == packet.id
+    //             ))
+    //         )
+    //         // among those, get packets where inactivity timeout has passed
+    //         packetsWithoutResponse.filter(
+    //             packet => 
+    //             val sentAt = curChainTimes.get(ProviderChain) - PacketTimeout // compute when the packet was sent
+    //             val timesOutAt = sentAt + InactivityTimeout // compute when the packet times out
+    //             timesOutAt <= curChainTimes.get(ProviderChain)
+    //         ).size() > 0
+    //     }
+
+    // // utility action that leaves all provider state untouched
+    // action PROVIDER_NOOP(): bool = 
+    //     all {
+    //         receivedMaturations' = receivedMaturations,
+    //     }
+
+    // // utility action that leaves all consumer state untouched
+    // action CONSUMER_NOOP(): bool = 
+    //     all {
+    //         maturationTimes' = maturationTimes,
+    //     }
+    
 
+    // // MODEL ACTIONS
+
+    // // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
+    // // e.g. via undelegations, or delegations, ...
+    // action doVotingPowerChange(validator: Node, amount: int): bool =
+    //     // for the provider chain, we need to adjust the voting power history
+    //     // by adding a new set
+    //     all {
+    //         amount >= 0,
+    //         val newValidatorSet = getCurrentValidatorSet(ProviderChain).getUpdatedValidatorSet(validator, amount)
+    //         // set the running validator set on the provider chain, but don't update the history yet
+    //         runningValidatorSet' = runningValidatorSet.set(ProviderChain, newValidatorSet),
+    //         // no packets are sent yet, these are only sent on endAndBeginBlock
+    //         RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
+    //         outstandingPacketsToProvider' = outstandingPacketsToProvider,
+    //         receivedMaturations' = receivedMaturations,
+    //         CONSUMER_NOOP,
+    //         // voting power history is only updated on endAndBeginBlock
+    //         votingPowerHistories' = votingPowerHistories,
+    //         // consumer statusses do not change
+    //         consumerStatus' = consumerStatus,
+    //         // chain times do not change
+    //         curChainTimes' = curChainTimes,
+    //         // the validator set is considered to have changed
+    //         providerValidatorSetChangedInThisBlock' = true,
+    //     }
+
+    // // deliver the next outstanding packet from the consumer to the provider.
+    // // since this model assumes a single provider chain, this just takes a single chain as argument.
+    // action recvPacketOnProvider(consumer: Chain): bool = all {
+    //     // ensure there is a packet to be received
+    //     outstandingPacketsToProvider.get(consumer).length() > 0,
+    //     // remove packet from outstanding packets
+    //     val newPacketQueue = outstandingPacketsToProvider.get(consumer).tail()
+    //     outstandingPacketsToProvider' = outstandingPacketsToProvider.set(consumer, newPacketQueue),
+    //     // register the packet as received
+    //     val maturedPacket = outstandingPacketsToProvider.get(consumer).head()
+    //     receivedMaturations' = receivedMaturations.add(maturedPacket),
+    //     CONSUMER_NOOP,
+    //     RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
+    //     votingPowerHistories' = votingPowerHistories,
+    //     // no validator set changes are made
+    //     runningValidatorSet' = runningValidatorSet,
+    //     // consumer statusses do not change
+    //     consumerStatus' = consumerStatus,
+    //     // chain times do not change
+    //     curChainTimes' = curChainTimes,
+    //     // the validator set was not changed by this action (but might have been changed before in this block)
+    //     providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+    // }
+
+    // // deliver the next outstanding packet from the provider to the consumer.
+    // // since this model assumes a single provider chain, this just takes a single chain as argument.
+    // action recvPacketOnConsumer(consumer: Chain): bool = all {
+    //     // ensure there is a packet to be received
+    //     outstandingPacketsToConsumer.get(consumer).length() > 0,
+    //     // remove packet from outstanding packets
+    //     val newPacketQueue = outstandingPacketsToConsumer.get(consumer).tail()
+    //     val newOutstandingPackets = outstandingPacketsToConsumer.set(consumer, newPacketQueue)
+    //     RegisterNewOutstandingPackets(newOutstandingPackets),
+    //     val packet = outstandingPacketsToConsumer.get(consumer).head()
+    //     all {
+    //         // update the running validator set, but not the history yet,
+    //         // as that only happens when the next block is started
+    //         runningValidatorSet' = runningValidatorSet.set(consumer, packet.validatorSet),
+    //         // add the new packet and store its maturation time
+    //         val newMaturationTimes = maturationTimes.get(consumer).put(packet, curChainTimes.get(consumer) + UnbondingPeriod.get(consumer))
+    //         maturationTimes' = maturationTimes.set(consumer, newMaturationTimes)
+    //     },
+    //     PROVIDER_NOOP,
+    //     votingPowerHistories' = votingPowerHistories,
+    //     outstandingPacketsToProvider' = outstandingPacketsToProvider,
+    //     // consumer statusses do not change
+    //     consumerStatus' = consumerStatus,
+    //     // chain times do not change
+    //     curChainTimes' = curChainTimes,
+    //     // the validator set was not changed by this action (but might have been changed before in this block)
+    //     providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+    // }
+
+    // // ends the current block and starts the next block for a given chain.
+    // action endAndBeginBlock(chain: Chain): bool = any {
+    //     all {
+    //       chain == ProviderChain,
+    //       endAndBeginBlockForProvider,
+    //     },
+    //     all {
+    //         chain != ProviderChain,
+    //         endAndBeginBlockForConsumer(chain),
+    //     }
+    // }
+
+    // // gets the updated history for the current chain when ending a block, i.e. the
+    // // running validator set is added to the history if different from the last one.
+    // def getUpdatedHistory(chain: Chain): List[ValidatorSet] =
+    //     // update voting power history if the validator set changed
+    //     val newValidatorSet = runningValidatorSet.get(ProviderChain)
+    //     val oldValidatorSet = votingPowerHistories.get(ProviderChain).head()
+    //     if (newValidatorSet != oldValidatorSet) 
+    //         votingPowerHistories.get(ProviderChain).prepend(newValidatorSet)
+    //     else
+    //         votingPowerHistories.get(ProviderChain)
+
+
+    // action endAndBeginBlockForProvider(): bool = all {
+    //     // update the voting power history
+    //     votingPowerHistories' = votingPowerHistories.set(ProviderChain, getUpdatedHistory(ProviderChain)),
+    //     // the running validator set is now for sure the current validator set,
+    //     // so start with it in the next block
+    //     runningValidatorSet' = runningValidatorSet,
+    //     // send VSCPackets to consumers
+    //     val newOutstandingPackets = 
+    //         // if running validator set is considered to have changed
+    //         if (providerValidatorSetChangedInThisBlock)
+    //             // then send a packet to each running consumer
+    //             outstandingPacketsToConsumer.keys().mapBy(
+    //                 (consumer) => 
+    //                 val packetQueue = outstandingPacketsToConsumer.get(consumer)
+    //                 if (consumerStatus.get(consumer) == RUNNING) {
+    //                     packetQueue.append(
+    //                         {
+    //                             id: packetQueue.length(),
+    //                             validatorSet: runningValidatorSet.get(ProviderChain),
+    //                             timeout: curChainTimes.get(ProviderChain) + PacketTimeout
+    //                         }
+    //                     )
+    //                 } else {
+    //                     packetQueue
+    //                 }
+    //             )
+    //         else
+    //             // otherwise, don't send any packets
+    //             outstandingPacketsToConsumer
+    //     RegisterNewOutstandingPackets(newOutstandingPackets),
+    //     CONSUMER_NOOP,
+    //     // no packets are sent to the provider
+    //     outstandingPacketsToProvider' = outstandingPacketsToProvider,
+    //     // do not receive any maturations
+    //     receivedMaturations' = receivedMaturations,
+    //     // consumer statusses do not change
+    //     consumerStatus' = consumerStatus,
+    //     // chain times do not change
+    //     curChainTimes' = curChainTimes,
+    //     // the validator set was definitely not changed in the new block yet, so set to false
+    //     providerValidatorSetChangedInThisBlock' = false
+    // }
+
+    // action endAndBeginBlockForConsumer(consumer: Chain): bool = all {
+    //     ConsumerChains.contains(consumer),
+    //     // update the voting power history
+    //     votingPowerHistories' = votingPowerHistories.set(consumer, getUpdatedHistory(consumer)),
+    //     // the running validator set is now for sure the current validator set,
+    //     // so start with it in the next block
+    //     runningValidatorSet' = runningValidatorSet,
+    //     // compute mature packets whose maturation time has passed
+    //     val maturedPackets = maturationTimes.get(consumer).keys().filter(
+    //         packet => 
+    //         val maturationTime = maturationTimes.get(consumer).get(packet)
+    //         maturationTime <= curChainTimes.get(consumer)
+    //     )
+    //     all {
+    //         // remove matured packets from the maturation times
+    //         maturationTimes' = maturationTimes.set(consumer, maturationTimes.get(consumer).mapRemoveAll(maturedPackets)),
+    //         // send matured packets
+    //         outstandingPacketsToProvider' = outstandingPacketsToProvider.set(
+    //             consumer, 
+    //             // construct VSCMaturedPackets from the matured VSCPackets
+    //             outstandingPacketsToProvider.get(consumer).concat(
+    //                 maturedPackets.map(packet => {id: packet.id, timeout: 5}).toList()
+    //             )
+    //         )
+    //     },
+    //     PROVIDER_NOOP,
+    //     // no packets are sent to consumer or received by it
+    //     RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
+    //     // consumer statusses do not change
+    //     consumerStatus' = consumerStatus,
+    //     // chain times do not change
+    //     curChainTimes' = curChainTimes,
+    //     // the validator set was not changed by this action (but might have been changed before in this block)
+    //     // also, this is only a new block for a consumer, so the change variable shouldn't be reset
+    //     providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+    // }
+
+    // // advance timestamps for maps nondeterministically
+    // action AdvanceTime(): bool = 
+    //         val advanceAmounts = curChainTimes.keys().mapBy(
+    //             chain =>    
+    //             nondet amount = oneOf(1.to(10))
+    //             amount
+    //         )
+    //         AdvanceTimeByMap(advanceAmounts)
+
+    // // the timestamp for each chain is advanced by the given amount
+    // action AdvanceTimeByMap(advancementAmount: Chain -> int): bool = all
+    //     {
+    //         curChainTimes' = curChainTimes.keys().mapBy(
+    //             chain => 
+    //             curChainTimes.get(chain) + advancementAmount.get(chain)
+    //         ),
+    //         // all other variables are left untouched
+    //         votingPowerHistories' = votingPowerHistories,
+    //         runningValidatorSet' = runningValidatorSet,
+    //         outstandingPacketsToProvider' = outstandingPacketsToProvider,
+    //         RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
+    //         receivedMaturations' = receivedMaturations,
+    //         maturationTimes' = maturationTimes,
+    //         // chain times do not change
+    //         consumerStatus' = consumerStatus,
+    //         // the validator set was not changed by this action (but might have been changed before in this block)
+    //         providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+    //     }
+
+    // // each consumer chain may advance in the order
+    // // some events may necessitate a transition, e.g. timeouts.
+    // // shouldAdvance gives, for each consumer chain, whether it should advance if possible.
+    // // if a chain has to advance, e.g. due to timeouts, or may not advance, the value will have no effect.
+    // action AdvanceConsumers(shouldAdvance: Chain -> bool): bool = 
+    //     val newConsumerStatus = consumerStatus.keys().mapBy(
+    //         chain => 
+    //         val curStatus = consumerStatus.get(chain)
+    //         if (curStatus == UNUSED) {
+    //             if (shouldAdvance.get(chain))
+    //             {
+    //                 RUNNING
+    //             } else {
+    //                 UNUSED
+    //             }
+    //         }
+    //         else if (curStatus == RUNNING) {
+    //             // the chain may transition to stopped.
+    //             // it is *forced* to stop if a packet timed out,
+    //             // or if the inactivity timeout has passed
+    //             if(consumerTimedOut(chain)) {
+    //                 STOPPED
+    //             } else {
+    //                 if (shouldAdvance.get(chain)) {
+    //                     RUNNING
+    //                 } else {
+    //                     STOPPED
+    //                 }
+    //             }
+    //         } else {
+    //             // stopped chains cannot restart, we assume a new chain would be started in that case
+    //             STOPPED
+    //         }
+    //         )
+    //     all {
+    //         consumerStatus' = newConsumerStatus,
+    //         // all other variables are left untouched
+    //         votingPowerHistories' = votingPowerHistories,
+    //         runningValidatorSet' = runningValidatorSet.keys().mapBy(
+    //             chain => 
+    //             if (newConsumerStatus.get(chain) == RUNNING and consumerStatus.get(chain) == UNUSED) 
+    //             // consumers that went from unused to running start with the current validator set on the provider
+    //             { 
+    //                 runningValidatorSet.get(ProviderChain) 
+    //             } else {
+    //                 runningValidatorSet.get(chain)
+    //             }
+    //         ),
+    //         outstandingPacketsToProvider' = outstandingPacketsToProvider,
+    //         RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
+    //         receivedMaturations' = receivedMaturations,
+    //         maturationTimes' = maturationTimes,
+    //         // chain times do not change
+    //         curChainTimes' = curChainTimes,
+    //         // the validator set was not changed by this action (but might have been changed before in this block)
+    //         providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
+    //     }
+
+    // // Updates the outstandingPacketsToConsumer and sentVSCPackets variables
+    // action RegisterNewOutstandingPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
+    //     all {
+    //         outstandingPacketsToConsumer' = newOutstandingPackets,
+    //         StoreSentPackets(newOutstandingPackets),
+    //     }
+
+
+    // // stores the VSCPackets sent in this step in sentVSCPackets
+    // action StoreSentPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
+    //     sentVSCPackets' = sentVSCPackets.keys().mapBy(
+    //         (chain) => 
+    //         sentVSCPackets.get(chain).union(newOutstandingPackets.get(chain).toSet())
+    //     )
 
+    
+    // // the main step action 
+    // action step: bool = any {
+    //     AdvanceTime,
+    //     nondet node = oneOf(Nodes)
+    //     nondet amount = oneOf(1.to(10))
+    //     votingPowerChange(node, amount),
+    //     recvPacketOnProvider(oneOf(ConsumerChains)),
+    //     recvPacketOnConsumer(oneOf(ConsumerChains)),
+    //     nondet chain = oneOf(chains)
+    //     endAndBeginBlock(chain),
+    //     val shouldAdvance = ConsumerChains.mapBy(
+    //         chain => 
+    //         nondet should = oneOf(Set(true, false))
+    //         should
+    //     )
+    //     AdvanceConsumers(shouldAdvance),
+    // }
+
+    // pure val nodePowerSet = Nodes.powerset()
+
+    // def getArbitraryValidatorSet(): ValidatorSet = 
+    //     nondet numValidators = oneOf(1.to(Nodes.size()))
+    //     // toList has nondeterministic behaviour, so this gets arbitrary validators
+    //     nondet validators = oneOf(nodePowerSet.filter(s => s.size() == numValidators))
+    //     validators.mapBy(
+    //         validator => 
+    //         nondet votingPower = oneOf(1.to(10))
+    //         votingPower
+    //     )
+
+    // // INITIALIZATION
+    // action init: bool = 
+    // all {
+    //     val validatorSets = chains.mapBy(
+    //         (chain) => 
+    //     // provider chain gets an arbitrary validator set, consumer chains have none
+    //         if (chain == ProviderChain) getArbitraryValidatorSet else Map()
+    //     )
+    //     all {
+    //         votingPowerHistories' = chains.mapBy(
+    //             (chain) => 
+    //             List(validatorSets.get(chain))
+    //         ),
+    //         runningValidatorSet' = validatorSets,
+    //     },
+    //     // each chain starts at time 0
+    //     curChainTimes' = chains.mapBy(
+    //         (chain) => 0
+    //     ),
+    //     // all consumer chains are unused
+    //     consumerStatus' = chains.mapBy(chain => UNUSED),
+    //     // no packets are outstanding
+    //     outstandingPacketsToProvider' = chains.mapBy(chain => List()),
+    //     outstandingPacketsToConsumer' = chains.mapBy(chain => List()),
+    //     // no maturations have been received by provider
+    //     receivedMaturations' = Set(),
+    //     // no packets have been sent to consumers
+    //     sentVSCPackets' = chains.mapBy(chain => Set()),
+    //     // no packets have been received by consumers, so no maturation times set
+    //     maturationTimes' = chains.mapBy(chain => Map()),
+    //     // validator set was not changed yet
+    //     providerValidatorSetChangedInThisBlock' = false
+    // }
+
+    // // PROPERTIES
+
+    // // Every validator set on any consumer chain MUST either be or
+    // // have been a validator set on the provider chain.
+    // val ValidatorSetReplication: bool = 
+    //     chains.forall(
+    //         chain => chain.getCurrentValidatorSet().wasValidatorSetOnProvider()
+    //     )
+
+    // // TESTS
+    // run VSCHappyPathTest: bool = {
+    //     init
+    //     // trigger a votingPowerChange on the provider chain
+    //     .then(votingPowerChange("A", 10))
+    //     // endAndBeginBlock on provider. No consumer chains are running, so no packets are sent
+    //     .then(endAndBeginBlock(ProviderChain))
+    //     .then(all {
+    //         // no packet was sent
+    //         assert(outstandingPacketsToConsumer.get("chain1").length() == 0),
+    //         // advance chain1 to running
+    //         AdvanceConsumers(NoStatusAdvancement.set("chain1", true))
+    //     })
+    //     // consumer chain should have current validator set from provider
+    //     .then(
+    //         all { 
+    //             // since consumer chain just started, its assumed to have the validator set from provider
+    //             assert(runningValidatorSet.get("chain1") == runningValidatorSet.get(ProviderChain)),
+    //             // trigger a votingPowerChange on the provider chain
+    //             votingPowerChange("B", 10)
+    //         }
+    //     )
+    //     .then(
+    //         val valSet = runningValidatorSet.get(ProviderChain)
+    //         endAndBeginBlock(ProviderChain)
+    //         // now the provider should send a packet on block end
+    //         .then(all {
+    //             // a packet was sent
+    //             assert(outstandingPacketsToConsumer.get("chain1").length() == 1),
+    //             // deliver the packet to the consumer
+    //             recvPacketOnConsumer("chain1")
+    //         })
+    //         .then(
+    //             // consumer needs to end a block before it has the new validator set
+    //             endAndBeginBlock("chain1")
+    //         )
+    //         .then(all {
+    //             // the consumer should have the new validator set
+    //             assert(runningValidatorSet.get("chain1") == valSet),
+    //             // put a last action to satisfy the action effect
+    //             AdvanceConsumers(NoStatusAdvancement)
+    //         })
+    //     )
+    // }
+
+    // // utility: the set of consumers currently running
+    // val RunningConsumers: Set[Chain] = 
+    //     ConsumerChains.filter(chain => consumerStatus.get(chain) == RUNNING)
+
+    // // MODEL STATE
+    // // --SHARED STATE
+
+    // // Stores, for each chain, the list of voting powers that corresponded to voting powers 
+    // // at blocks over its entire existence.
+    // // Voting powers should be ordered by recency in descending order.
+    // var votingPowerHistories: Chain -> List[ValidatorSet]
+
+    // // the current validator set on each chain.
+    // // this will be included in the next block, but might not be final yet,
+    // // e.g. there may be more modifications in the current block.
+    // var runningValidatorSet: Chain -> ValidatorSet
+
+    // // the current timestamp for each chain
+    // var curChainTimes: Chain -> Timestamp
+
+    // // stores, for each chain, its current status -
+    // // unused, running, or stopped
+    // var consumerStatus: Chain -> str
+
+    // // --CHANNELS
+    // // Stores, for each consumer chain, the list of packets that have been sent to the provider chain
+    // // and have not been received yet.
+    // var outstandingPacketsToProvider: Chain -> List[VSCMaturedPacket]
+
+    // // Stores, for each consumer chain, the list of packets that have been sent to the consumer chain
+    // // and have not been received yet.
+    // var outstandingPacketsToConsumer: Chain -> List[VSCPacket]
+
+
+    // // --CONSUMER STATE
+    // // Stores the maturation times for VSCPackets received by consumers
+    // var maturationTimes: Chain -> (VSCPacket -> Timestamp)
+
+    // // --PROVIDER STATE
+    // // the set of VSCMaturedPackets received by the provider chain
+    // var receivedMaturations: Set[VSCMaturedPacket]
+
+    // // stores which VSC Packets have been sent to compare with receivedMaturations to detect timeouts due to non-responsiveness
+    // var sentVSCPackets: Chain -> Set[VSCPacket]
+
+    // // stores whether, in this step, the validator set considered to be changed.
+    // // this is needed because the validator set might be considered to have changed, even though
+    // // it is still technically identical at our level of abstraction, e.g. a validator power change on the provider
+    // // might leave the validator set the same because a delegation and undelegation cancel each other out.
+    // var providerValidatorSetChangedInThisBlock: bool
+
+    // // utility: a struct summarizing the current state
+    // val state = 
+    //     {
+    //         votingPowerHistories: votingPowerHistories,
+    //         runningValidatorSet: runningValidatorSet,
+    //         curChainTimes: curChainTimes,
+    //         consumerStatus: consumerStatus,
+    //         outstandingPacketsToProvider: outstandingPacketsToProvider,
+    //         outstandingPacketsToConsumer: outstandingPacketsToConsumer,
+    //         maturationTimes: maturationTimes,
+    //         receivedMaturations: receivedMaturations,
+    //         sentVSCPackets: sentVSCPackets,
+    //     }
+
+    // // set of identifiers of potential nodes
+    // pure val Nodes: Set[Node] = 
+    //     Set("A", "B", "C", "D", "E", "F", "G", "H", "I", "J")
+
+    // // the set of consumer chains
+    // pure val ConsumerChains: Set[Chain] = 
+    //     Set("chain1", "chain2", "chain3")
+
+    // // The singular provider chain.
+    // pure val ProviderChain: Chain = 
+    //     "provider"
+        
+    // pure val chains = ConsumerChains.union(Set(ProviderChain))
+
+    // // length of the unbonding period on each chain
+    // pure val UnbondingPeriod: Chain -> int = chains.mapBy(
+    //     (chain) => 
+    //     10
+    // )
+
+    // // the time until a packet times out
+    // pure val PacketTimeout: int = 
+    //     5
+
+    // // the time until a consumer chain is dropped by the provider due to inactivity
+    // pure val InactivityTimeout: int =
+    //     10
+
+    // // utility: a map assigning each chain to 0, used for not advancing timestamps
+    // pure val NoTimeAdvancement: Chain -> int = chains.mapBy(
+    //     (chain) => 
+    //     0
+    // )
+
+
+    // // utility: a map assigning each chain to false, used for not advancing consumer status
+    // pure val NoStatusAdvancement: Chain -> bool = chains.mapBy(
+    //     (chain) => 
+    //     false
+    // )
 }
diff --git a/tests/difference/core/quint_model/extraSpells.qnt b/tests/difference/core/quint_model/extraSpells.qnt
index cd2105beb7..5c98f7a384 100644
--- a/tests/difference/core/quint_model/extraSpells.qnt
+++ b/tests/difference/core/quint_model/extraSpells.qnt
@@ -1,4 +1,3 @@
--*- mode: Bluespec; -*-
 // This module is just a library with utility functions (sometimes called spells in Quint).
 module extraSpells {
 

From 4bbe033ddf663526c2904f842ec301efe8a7996f Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Tue, 19 Sep 2023 17:00:27 +0200
Subject: [PATCH 14/80] Continue seperating logic in Quint model

---
 tests/difference/core/quint_model/ccv.qnt | 114 ++++++++++++++++++----
 1 file changed, 97 insertions(+), 17 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 4cbc327ac4..5df198fd73 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -103,8 +103,9 @@ module ccv_logic {
 
         // Stores the list of packets that have been sent to the provider chain by this consumer
         // and have not been received yet.
+        // ordered by recency, so the head is the oldest packet.
         // In the implementation, essentially unacknowledged IBC packets.
-        outstandingPacketsToProvider: Chain -> List[VSCMaturedPacket],
+        outstandingPacketsToProvider: List[VSCMaturedPacket],
 
         // Stores the list of voting powers that corresponded to voting powers 
         // at blocks over the chains entire existence.
@@ -118,7 +119,7 @@ module ccv_logic {
         // the state of each consumer chain.
         // note that we assume that this contains all consumer chains that may ever exist,
         // and consumer chains that are currently not running will have providerState.consumerStatus == UNUSED or STOPPED
-        consumerStates: Set[ConsumerState]
+        consumerStates: Chain -> ConsumerState
     }
 
     type Error = {
@@ -160,7 +161,7 @@ module ccv_logic {
                     providerValidatorSetChangedInThisBlock: false,
                     consumerStatus: Map()
                 },
-                consumerStates: Set()
+                consumerStates: Map(),
             },
             error: {
                 message: msg
@@ -171,26 +172,105 @@ module ccv_logic {
     // ===================
     // PROTOCOL LOGIC
     // ===================
+    
+    // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
+    // e.g. via undelegations, or delegations, ...
+    pure def votingPowerChange(currentState: ProtocolState, validator: Node, amount: int): Result = {
+            if (amount < 0) {
+                Err("Voting power changes must be positive")
+            } else {
+                pure val currentValidatorSet = currentState.providerState.chainState.currentValidatorSet
+                pure val newValidatorSet = getUpdatedValidatorSet(currentValidatorSet, validator, amount)
+                pure val newState = setProviderValidatorSet(currentState, newValidatorSet)
+                Ok(newState)
+            }
+    }
+
+    // Delivers the next queued VSCMaturedPacket from a consumer chain to the provider chain.
+    // Only argument is the consumer chain, from which the packet will be delivered.
+    pure def deliverPacketToProvider(currentState: ProtocolState, sender: Chain): Result = {
+        if (not(isCurrentlyConsumer(sender, currentState))) {
+            Err("Sender is not currently a consumer - must have 'running' status!")
+        } else if (length(currentState.consumerStates.get(sender).outstandingPacketsToProvider) == 0) {
+            Err("No outstanding packets to deliver")
+        } else {
+            val packet = currentState.consumerStates.get(sender).outstandingPacketsToProvider.head()
+            val result = recvPacketOnProvider(currentState, sender, packet)
+            val tmpState = result.newState
+            if (result.hasError) {
+                Err(result.error.message)
+            } else {
+                val result2 = removeOutstandingPacketFromConsumer(tmpState, sender)
+                val tmpState2 = result2.newState
+                val err2 = result2.error
+                if (result2.hasError) {
+                    Err(err2.message)
+                } else {
+                    Ok(tmpState2)
+                }
+            }
+        }
+    }
+
+    // ===================
+    // UTILITY FUNCTIONS
+    // ===================
+
+    // receives a given packet on the provider. The arguments are the consumer chain that sent the packet, and the packet itself.
+    pure def recvPacketOnProvider(currentState: ProtocolState, sender: Chain, packet: VSCMaturedPacket): Result = {
+        if (not(isCurrentlyConsumer(sender, currentState))) {
+            Err("Sender is not currently a consumer - must have 'running' status!")
+        } else {
+            val currentReceivedMaturations = currentState.providerState.receivedMaturations
+            val newReceivedMaturations = currentReceivedMaturations.add(packet)
+            val newProviderState = currentState.providerState.with(
+                "receivedMaturations", newReceivedMaturations
+            )
+            val newState = currentState.with(
+                "providerState", newProviderState
+            )
+            Ok(newState)
+        }
+    }
+
+    // removes the oldest outstanding packet from the consumer. on-chain, this would happen when the packet is acknowledged.
+    // only the oldest packet can be removed, since we model ordered channels.
+    pure def removeOutstandingPacketFromConsumer(currentState: ProtocolState, sender: Chain): Result = {
+        val currentOutstandingPackets = currentState.consumerStates.get(sender).outstandingPacketsToProvider
+        val newOutstandingPackets = currentOutstandingPackets.tail()
+        val newConsumerState = currentState.consumerState.get(sender).with(
+            "outstandingPacketsToProvider", newOutstandingPackets
+        )
+        val newConsumerStates = currentState.consumerStates.set(sender, newConsumerState)
+        val newState = currentState.with(
+            "consumerStates", newConsumerStates
+        )
+        Ok(newState)
+        // Err("Not implemented")
+    }
 
     pure def getUpdatedValidatorSet(oldValidatorSet: ValidatorSet, validator: Node, newVotingPower: int): ValidatorSet =
         if (newVotingPower > 0) 
         oldValidatorSet.put(validator, newVotingPower)
         else
         oldValidatorSet.mapRemove(validator)
-    
-    // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
-    // e.g. via undelegations, or delegations, ...
-    pure def votingPowerChange(currentState: ProtocolState, validator: Node, amount: int): Result =
-            // adjust the current validator set on the provider - it is not entered in the voting history yet because that happens only on block end
-            val currentValidatorSet = currentState.providerState.currentValidatorSet
-            // val newValidatorSet = getUpdatedValidatorSet(currentValidatorSet, validator, amount)
-            // val newProviderState = currentState.providerState.with(
-            //     "currentValidatorSet", newValidatorSet
-            // )
-            // val newState = currentState.with(
-            //     "providerState", newProviderState
-            // )
-            Err("not implemented")
+
+    pure def setProviderValidatorSet(currentState: ProtocolState, newValidatorSet: ValidatorSet): ProtocolState = {
+        pure val newChainState = currentState.providerState.chainState.with(
+            "currentValidatorSet", newValidatorSet
+        )
+        currentState.with(
+            "providerState", 
+                currentState.providerState.with(
+                    "chainState", newChainState
+            )
+        )
+    }
+
+    pure def isCurrentlyConsumer(chain: Chain, currentState: ProtocolState): bool = {
+        val status = currentState.providerState.consumerStatus.get(chain)
+        status == RUNNING
+    }
 }
 
 module ccv_tests {

From 5ebab39b7aacc30fa2a5963d1187860c706953d4 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Wed, 20 Sep 2023 13:23:55 +0200
Subject: [PATCH 15/80] Start debugging cryptic error message

---
 tests/difference/core/quint_model/ccv.qnt | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 5df198fd73..d0924f9e50 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -106,11 +106,6 @@ module ccv_logic {
         // ordered by recency, so the head is the oldest packet.
         // In the implementation, essentially unacknowledged IBC packets.
         outstandingPacketsToProvider: List[VSCMaturedPacket],
-
-        // Stores the list of voting powers that corresponded to voting powers 
-        // at blocks over the chains entire existence.
-        // Voting powers should be ordered by recency in descending order.
-        votingPowerHistory: VotingPowerHistory,
     }
 
     // the state of the protocol consists of the composition of the state of one provider chain with potentially many consumer chains.
@@ -153,7 +148,7 @@ module ccv_logic {
                     chainState: {
                         votingPowerHistory: List(),
                         currentValidatorSet: Map(),
-                        lastTimestamp: 0
+                        lastTimestamp: 0,
                     },
                     outstandingPacketsToConsumer: Map(),
                     receivedMaturations: Set(),

From 5bca6fc7e3a50c03dba32a7ad7df2a0361cbba2d Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Wed, 20 Sep 2023 14:38:51 +0200
Subject: [PATCH 16/80] Start adding endAndBeginBlock defs

---
 tests/difference/core/quint_model/ccv.qnt     | 123 ++++++++++++++++--
 .../core/quint_model/extraSpells.qnt          |  13 --
 2 files changed, 112 insertions(+), 24 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index d0924f9e50..1c250f94b8 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -9,7 +9,6 @@ module ccv_logic {
     // Things that explicitly are modelled:
     // * Validator set changes are propagated from provider to consumers
     // * VSC packets mature
-    // * Consumers can be forcefully dropped due to timeouts, or stop on their own volition
     
     // ===================
     // TYPE DEFINITIONS
@@ -23,11 +22,10 @@ module ccv_logic {
     // a list of validator sets per blocks, ordered by recency
     type VotingPowerHistory = List[ValidatorSet]
 
-    // --PACKETS
     type VSCPacket =
         {   
             // the identifier for this packet
-            id: int,
+            VscId: int,
             // the new validator set. in the implementation, this would be a list of validator updates
             validatorSet: ValidatorSet,
             // the time, that when passed on the receiver chain, will mean the packet is considered timed out
@@ -41,12 +39,6 @@ module ccv_logic {
             // the time, that when passed on the receiver chain, will mean the packet is considered timed out
             timeout: Timestamp
         }
-    
-    // possible consumer statuses
-    pure val STOPPED = "stopped" // the chain was once a consumer chain, but has been dropped by the provider.
-    pure val RUNNING = "running" // the chain is currently a consumer chain. Running chains are those that get sent VSCPackets.
-    pure val UNUSED = "unused" // the chain has never been a consumer chain, and is available to become one.
-    // When a chain is dropped, it cannot become a consumer again - we assume that would be done by another consumer becoming running.
 
 
     // state that each chain needs to store, whether consumer or provider.
@@ -164,6 +156,23 @@ module ccv_logic {
         }
     }
 
+    // possible consumer statuses
+    pure val STOPPED = "stopped" // the chain was once a consumer chain, but has been dropped by the provider.
+    pure val RUNNING = "running" // the chain is currently a consumer chain. Running chains are those that get sent VSCPackets.
+    pure val UNUSED = "unused" // the chain has never been a consumer chain, and is available to become one.
+    // When a chain is dropped, it cannot become a consumer again - we assume that would be done by another consumer becoming running.
+
+    // the provider chain.
+    // given as a pure val so that we can switch cases based on
+    // whether a chain is the provider or not
+    pure val PROVIDER_CHAIN = "provider"
+
+    // ===================
+    // PROTOCOL PARAMETERS
+    // ===================
+
+    const UnbondingPeriodPerChain: Chain -> int
+
     // ===================
     // PROTOCOL LOGIC
     // ===================
@@ -207,11 +216,99 @@ module ccv_logic {
         }
     }
 
+    pure def endAndBeginBlockForProvider(
+        currentState: ProtocolState,
+        chain: Chain,
+        timeAdvancement: Timestamp,
+        newConsumerStatusses: Chain -> ConsumerState): Result = {
+        // commit the current running validator set on chain
+        val currentProviderState = currentState.providerState
+        val newChainState = currentState.providerState.chainState.with(
+            "votingPowerHistory", currentState.providerState.chainState.votingPowerHistory.prepend(
+                currentState.providerState.chainState.currentValidatorSet
+            )
+        ).with(
+            "lastTimestamp", currentState.providerState.chainState.lastTimestamp + 1
+        )
+        Err("not implemented")
+    //     votingPowerHistories' = votingPowerHistories.set(ProviderChain, getUpdatedHistory(ProviderChain)),
+    //     // the running validator set is now for sure the current validator set,
+    //     // so start with it in the next block
+    //     runningValidatorSet' = runningValidatorSet,
+    //     // send VSCPackets to consumers
+    //     val newOutstandingPackets = 
+    //         // if running validator set is considered to have changed
+    //         if (providerValidatorSetChangedInThisBlock)
+    //             // then send a packet to each running consumer
+    //             outstandingPacketsToConsumer.keys().mapBy(
+    //                 (consumer) => 
+    //                 val packetQueue = outstandingPacketsToConsumer.get(consumer)
+    //                 if (consumerStatus.get(consumer) == RUNNING) {
+    //                     packetQueue.append(
+    //                         {
+    //                             id: packetQueue.length(),
+    //                             validatorSet: runningValidatorSet.get(ProviderChain),
+    //                             timeout: curChainTimes.get(ProviderChain) + PacketTimeout
+    //                         }
+    //                     )
+    //                 } else {
+    //                     packetQueue
+    //                 }
+    //             )
+    //         else
+    //             // otherwise, don't send any packets
+    //             outstandingPacketsToConsumer
+    //     RegisterNewOutstandingPackets(newOutstandingPackets),
+    //     CONSUMER_NOOP,
+    //     // no packets are sent to the provider
+    //     outstandingPacketsToProvider' = outstandingPacketsToProvider,
+    //     // do not receive any maturations
+    //     receivedMaturations' = receivedMaturations,
+    //     // consumer statusses do not change
+    //     consumerStatus' = consumerStatus,
+    //     // chain times do not change
+    //     curChainTimes' = curChainTimes,
+    //     // the validator set was definitely not changed in the new block yet, so set to false
+    //     providerValidatorSetChangedInThisBlock' = false
+    }
+
     // ===================
     // UTILITY FUNCTIONS
     // ===================
 
+    // receives a given packet (sent by the provider) on the consumer. The arguments are the consumer chain that is receiving the packet, and the packet itself.
+    // To receive a packet, modify the running validator set (not the one entered into the block yet,
+    // but the candidate that would be put into the block if it ended now)
+    // and store the maturation time for the packet.
+    pure def recvPacketOnConsumer(currentState: ProtocolState, receiver: Chain, packet: VSCPacket): Result = {
+        if(not(isCurrentlyConsumer(receiver, currentState))) {
+            Err("Receiver is not currently a consumer - must have 'running' status!")
+        } else {
+            // update the running validator set, but not the history yet,
+            // as that only happens when the next block is started
+            val currentConsumerState = currentState.consumerStates.get(receiver)
+            val newConsumerState = currentConsumerState.with(
+                "chainState",
+                currentConsumerState.chainState.with(
+                    "currentValidatorSet", packet.validatorSet
+                )
+            ).with(
+                "maturationTimes",
+                currentConsumerState.maturationTimes.put(
+                    packet, 
+                    currentConsumerState.chainState.lastTimestamp + UnbondingPeriodPerChain.get(receiver)
+                )
+            )
+            val newConsumerStates = currentState.consumerStates.set(receiver, newConsumerState)
+            val newState = currentState.with(
+                "consumerStates", newConsumerStates
+            )
+            Ok(newState)
+        }
+    }
+
     // receives a given packet on the provider. The arguments are the consumer chain that sent the packet, and the packet itself.
+    // To receive a packet, add it to the list of received maturations.
     pure def recvPacketOnProvider(currentState: ProtocolState, sender: Chain, packet: VSCMaturedPacket): Result = {
         if (not(isCurrentlyConsumer(sender, currentState))) {
             Err("Sender is not currently a consumer - must have 'running' status!")
@@ -233,7 +330,7 @@ module ccv_logic {
     pure def removeOutstandingPacketFromConsumer(currentState: ProtocolState, sender: Chain): Result = {
         val currentOutstandingPackets = currentState.consumerStates.get(sender).outstandingPacketsToProvider
         val newOutstandingPackets = currentOutstandingPackets.tail()
-        val newConsumerState = currentState.consumerState.get(sender).with(
+        val newConsumerState = currentState.consumerStates.get(sender).with(
             "outstandingPacketsToProvider", newOutstandingPackets
         )
         val newConsumerStates = currentState.consumerStates.set(sender, newConsumerState)
@@ -241,15 +338,18 @@ module ccv_logic {
             "consumerStates", newConsumerStates
         )
         Ok(newState)
-        // Err("Not implemented")
     }
 
+    // Updates the given oldValidatorSet by setting the validator to newVotingPower.
+    // If newVotingPower is zero, the validator is removed.
     pure def getUpdatedValidatorSet(oldValidatorSet: ValidatorSet, validator: Node, newVotingPower: int): ValidatorSet =
         if (newVotingPower > 0) 
         oldValidatorSet.put(validator, newVotingPower)
         else
         oldValidatorSet.mapRemove(validator)
 
+    // Returns a ProtocolState where the current validator set on the provider is set to 
+    // newValidatorSet.
     pure def setProviderValidatorSet(currentState: ProtocolState, newValidatorSet: ValidatorSet): ProtocolState = {
         pure val newChainState = currentState.providerState.chainState.with(
             "currentValidatorSet", newValidatorSet
@@ -262,6 +362,7 @@ module ccv_logic {
         )
     }
 
+    // Returns true if the given chain is currently a running consumer, false otherwise.
     pure def isCurrentlyConsumer(chain: Chain, currentState: ProtocolState): bool = {
         val status = currentState.providerState.consumerStatus.get(chain)
         status == RUNNING
diff --git a/tests/difference/core/quint_model/extraSpells.qnt b/tests/difference/core/quint_model/extraSpells.qnt
index 5c98f7a384..32f565b16a 100644
--- a/tests/difference/core/quint_model/extraSpells.qnt
+++ b/tests/difference/core/quint_model/extraSpells.qnt
@@ -146,19 +146,6 @@ module extraSpells {
             assert(m.mapRemoveAll(Set(5, 7)) == Map(3 -> 4)),
             assert(m.mapRemoveAll(Set(5, 99999)) == Map(3 -> 4, 7 -> 8)),
         }
-        
-    pure def listSorted(__list: List[a], __lt: (a, a) => bool): List[a] = {
-    pure def __countSmaller(__j: int): int = {
-      pure val __jth = __list[__j]
-      __list.indices().filter(__i =>
-        __lt(__list[__i], __jth) or (__list[__i] == __jth and __i < __j)
-      )
-      .size()
-    }
-
-    pure val __permutation = __list.indices().mapBy(__i => __countSmaller(__i))
-        __list.foldl([], (__l, __i) => __l.append(__list[__permutation.get(__i)]))
-    }
 
     //// Returns a list of all elements of a set.
     ////

From 4f77d68b9ad06525aa7241f392e6754de364f90c Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Thu, 21 Sep 2023 10:10:28 +0200
Subject: [PATCH 17/80] Diagnose Quint parser bug

---
 tests/difference/core/quint_model/ccv.qnt | 162 ++++++++++++++--------
 1 file changed, 105 insertions(+), 57 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 1c250f94b8..d8e6bcbece 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -9,6 +9,10 @@ module ccv_logic {
     // Things that explicitly are modelled:
     // * Validator set changes are propagated from provider to consumers
     // * VSC packets mature
+
+    // We assume that packet receive + ack happen synchronously, 
+    // i.e. when the packet is delivered, the ack is delivered right afterwards.
+    // This is because it is nontrivial in practice to get a relayer to relay a packet, but not its ack.
     
     // ===================
     // TYPE DEFINITIONS
@@ -16,6 +20,7 @@ module ccv_logic {
     type Node = str
     type Chain = str
     type Power = int
+    type VSCId = int
     type ValidatorSet = Node -> Power
     type Height = int
     type Timestamp = int
@@ -25,19 +30,19 @@ module ccv_logic {
     type VSCPacket =
         {   
             // the identifier for this packet
-            VscId: int,
+            id: VSCId,
             // the new validator set. in the implementation, this would be a list of validator updates
             validatorSet: ValidatorSet,
-            // the time, that when passed on the receiver chain, will mean the packet is considered timed out
-            timeout: Timestamp
+            // the time at which the packet was sent. used to check whether packets have timed out.
+            sendingTime: Timestamp
         }
 
     type VSCMaturedPacket = 
         {
             // the id of the VSCPacket that matured
-            id: int,
-            // the time, that when passed on the receiver chain, will mean the packet is considered timed out
-            timeout: Timestamp
+            id: VSCId,
+            // the time at which the packet was sent. used to check whether packets have timed out.
+            sendingTime: Timestamp
         }
 
 
@@ -74,6 +79,9 @@ module ccv_logic {
             // stores which VSC Packets have been sent to compare with receivedMaturations to detect timeouts due to non-responsiveness
             sentVSCPackets: Chain -> Set[VSCPacket],
 
+            // a mapping from (chainId, vscId) tuples to the timestamps of sent VSCPackets.
+            vscSendTimestamps: (Chain, VSCId) -> Timestamp,
+
             // stores whether, in this block, the validator set has changed.
             // this is needed because the validator set might be considered to have changed, even though
             // it is still technically identical at our level of abstraction, e.g. a validator power change on the provider
@@ -83,6 +91,10 @@ module ccv_logic {
             // stores, for each consumer chain, its current status -
             // unused, running, or stopped
             consumerStatus: Chain -> str,
+
+            // a monotonic strictly increasing and positive ID that is used
+            // to uniquely identify the VSCs sent to the consumer chains.
+            runningVscId: int,
         }
 
     // Defines the current state of a consumer chain. This information is accessible to that consumer on-chain.
@@ -105,7 +117,7 @@ module ccv_logic {
         providerState: ProviderState,
         // the state of each consumer chain.
         // note that we assume that this contains all consumer chains that may ever exist,
-        // and consumer chains that are currently not running will have providerState.consumerStatus == UNUSED or STOPPED
+        // and consumer chains that are currently not running will have providerState.consumerStatus == UNUSED or STOPPED.
         consumerStates: Chain -> ConsumerState
     }
 
@@ -146,7 +158,9 @@ module ccv_logic {
                     receivedMaturations: Set(),
                     sentVSCPackets: Map(),
                     providerValidatorSetChangedInThisBlock: false,
-                    consumerStatus: Map()
+                    consumerStatus: Map(),
+                    runningVscId: 0,
+                    vscSendTimestamps: Map(),
                 },
                 consumerStates: Map(),
             },
@@ -171,8 +185,16 @@ module ccv_logic {
     // PROTOCOL PARAMETERS
     // ===================
 
+    // For each chain, this defines the time between the initiation of an unbonding and its maturation.
     const UnbondingPeriodPerChain: Chain -> int
 
+    // The maximum time duration between sending any VSCPacket to any consumer chain and receiving the
+    // corresponding VSCMaturedPacket, without timing out the consumer chain and consequently removing it.
+    const VscTimeout: int
+
+    // The timeoutTimestamp for sending CCV packets.
+    const CcvTimeoutTimestamp: int
+
     // ===================
     // PROTOCOL LOGIC
     // ===================
@@ -193,7 +215,7 @@ module ccv_logic {
     // Delivers the next queued VSCMaturedPacket from a consumer chain to the provider chain.
     // Only argument is the consumer chain, from which the packet will be delivered.
     pure def deliverPacketToProvider(currentState: ProtocolState, sender: Chain): Result = {
-        if (not(isCurrentlyConsumer(sender, currentState))) {
+        if (not(isCurrentlyConsumer(sender, currentState.providerState))) {
             Err("Sender is not currently a consumer - must have 'running' status!")
         } else if (length(currentState.consumerStates.get(sender).outstandingPacketsToProvider) == 0) {
             Err("No outstanding packets to deliver")
@@ -216,60 +238,79 @@ module ccv_logic {
         }
     }
 
+    // returns the providerState with the following modifications:
+    // * sends VSCPackets to all running consumers
+    // * increments the runningVscId
+    // This should only be called when the provider chain is ending a block,
+    // and only when the running validator set is considered to have changed
+    // and there is a consumer to send a packet to.
+    pure def sendVscPackets(providerState: ProviderState): ProviderState = {
+        providerState.with(
+            // send VSCPackets to consumers
+            "outstandingPacketsToConsumer", 
+            // if running validator set is considered to have changed and there is a consumer to send a packet to
+            if (providerState.providerValidatorSetChangedInThisBlock
+                and getRunningConsumers(providerState).size() > 0) {
+                    // then send a packet to each running consumer
+                    providerState.consumerStatus.keys().mapBy(
+                        // go through all potential consumers
+                        (consumer) => 
+                        val packetQueue = providerState.outstandingPacketsToConsumer.get(consumer)
+                        // if the consumer is running, send a packet
+                        if (isCurrentlyConsumer(consumer, providerState)) {
+                            packetQueue.append(
+                                {
+                                    id: providerState.runningVscId,
+                                    validatorSet: providerState.chainState.currentValidatorSet,
+                                    sendingTime: providerState.chainState.lastTimestamp
+                                }
+                            )
+                        } else {
+                            // otherwise, leave the queue as-is
+                            packetQueue
+                        }
+                    )
+                } else {
+                    // running validator set is not considered to have changed
+                    // ...so don't send any packets
+                    providerState.outstandingPacketsToConsumer
+                }
+            ).with(
+                // the validator set has not changed yet in the new block
+                "providerValidatorSetChangedInThisBlock", false
+            ).with(
+                "runningVscId", providerState.runningVscId + 1
+            ) 
+    }
+
+    // Ends a block on the provider. This means that the current validator set is committed on chain,
+    // packets are queued, and the next block is started.
     pure def endAndBeginBlockForProvider(
         currentState: ProtocolState,
         chain: Chain,
-        timeAdvancement: Timestamp,
-        newConsumerStatusses: Chain -> ConsumerState): Result = {
+        // by how much the timestamp should be advanced,
+        // i.e. the timestamp for the next block is oldTimestamp + timeAdvancement
+        timeAdvancement: Timestamp): Result = {
         // commit the current running validator set on chain
         val currentProviderState = currentState.providerState
-        val newChainState = currentState.providerState.chainState.with(
-            "votingPowerHistory", currentState.providerState.chainState.votingPowerHistory.prepend(
-                currentState.providerState.chainState.currentValidatorSet
+        val newChainState = currentProviderState.chainState.with(
+            "votingPowerHistory", currentProviderState.chainState.votingPowerHistory.prepend(
+                currentProviderState.chainState.currentValidatorSet
             )
         ).with(
-            "lastTimestamp", currentState.providerState.chainState.lastTimestamp + 1
+            // advance the time
+            "lastTimestamp", currentProviderState.chainState.lastTimestamp + timeAdvancement
         )
+        val newProviderState = currentProviderState.with(
+            "chainState", newChainState
+        )
+        val providerStateAfterSending =
+         if (currentProviderState.providerValidatorSetChangedInThisBlock and getRunningConsumers(currentState.providerState).size() > 0) {
+                newProviderState.sendVscPackets()
+            } else {
+                newProviderState
+            }
         Err("not implemented")
-    //     votingPowerHistories' = votingPowerHistories.set(ProviderChain, getUpdatedHistory(ProviderChain)),
-    //     // the running validator set is now for sure the current validator set,
-    //     // so start with it in the next block
-    //     runningValidatorSet' = runningValidatorSet,
-    //     // send VSCPackets to consumers
-    //     val newOutstandingPackets = 
-    //         // if running validator set is considered to have changed
-    //         if (providerValidatorSetChangedInThisBlock)
-    //             // then send a packet to each running consumer
-    //             outstandingPacketsToConsumer.keys().mapBy(
-    //                 (consumer) => 
-    //                 val packetQueue = outstandingPacketsToConsumer.get(consumer)
-    //                 if (consumerStatus.get(consumer) == RUNNING) {
-    //                     packetQueue.append(
-    //                         {
-    //                             id: packetQueue.length(),
-    //                             validatorSet: runningValidatorSet.get(ProviderChain),
-    //                             timeout: curChainTimes.get(ProviderChain) + PacketTimeout
-    //                         }
-    //                     )
-    //                 } else {
-    //                     packetQueue
-    //                 }
-    //             )
-    //         else
-    //             // otherwise, don't send any packets
-    //             outstandingPacketsToConsumer
-    //     RegisterNewOutstandingPackets(newOutstandingPackets),
-    //     CONSUMER_NOOP,
-    //     // no packets are sent to the provider
-    //     outstandingPacketsToProvider' = outstandingPacketsToProvider,
-    //     // do not receive any maturations
-    //     receivedMaturations' = receivedMaturations,
-    //     // consumer statusses do not change
-    //     consumerStatus' = consumerStatus,
-    //     // chain times do not change
-    //     curChainTimes' = curChainTimes,
-    //     // the validator set was definitely not changed in the new block yet, so set to false
-    //     providerValidatorSetChangedInThisBlock' = false
     }
 
     // ===================
@@ -281,7 +322,7 @@ module ccv_logic {
     // but the candidate that would be put into the block if it ended now)
     // and store the maturation time for the packet.
     pure def recvPacketOnConsumer(currentState: ProtocolState, receiver: Chain, packet: VSCPacket): Result = {
-        if(not(isCurrentlyConsumer(receiver, currentState))) {
+        if(not(isCurrentlyConsumer(receiver, currentState.providerState))) {
             Err("Receiver is not currently a consumer - must have 'running' status!")
         } else {
             // update the running validator set, but not the history yet,
@@ -363,10 +404,17 @@ module ccv_logic {
     }
 
     // Returns true if the given chain is currently a running consumer, false otherwise.
-    pure def isCurrentlyConsumer(chain: Chain, currentState: ProtocolState): bool = {
-        val status = currentState.providerState.consumerStatus.get(chain)
+    pure def isCurrentlyConsumer(chain: Chain, providerState: ProviderState): bool = {
+        val status = providerState.consumerStatus.get(chain)
         status == RUNNING
     }
+
+    // Returns the set of all consumer chains that currently have the status RUNNING.
+    pure def getRunningConsumers(providerState: ProviderState): Set[Chain] = {
+        providerState.consumerStatus.keys().filter(
+            chain => providerState.consumerStatus.get(chain) == RUNNING
+        )
+    }
 }
 
 module ccv_tests {

From fa233d655ff0a86073f47bdebe7fce5054b7c6b7 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Thu, 21 Sep 2023 10:12:59 +0200
Subject: [PATCH 18/80] Fix type in Quint

---
 tests/difference/core/quint_model/ccv.qnt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index d8e6bcbece..ac5fe631a0 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -351,7 +351,7 @@ module ccv_logic {
     // receives a given packet on the provider. The arguments are the consumer chain that sent the packet, and the packet itself.
     // To receive a packet, add it to the list of received maturations.
     pure def recvPacketOnProvider(currentState: ProtocolState, sender: Chain, packet: VSCMaturedPacket): Result = {
-        if (not(isCurrentlyConsumer(sender, currentState))) {
+        if (not(isCurrentlyConsumer(sender, currentState.providerState))) {
             Err("Sender is not currently a consumer - must have 'running' status!")
         } else {
             val currentReceivedMaturations = currentState.providerState.receivedMaturations

From 66663bfdf6e8c142553334f20ecc6e98fcde8a52 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Thu, 21 Sep 2023 14:15:30 +0200
Subject: [PATCH 19/80] Add endBlock actions

---
 tests/difference/core/quint_model/ccv.qnt | 190 ++++++++++++++++++----
 1 file changed, 155 insertions(+), 35 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index ac5fe631a0..586c132ac6 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -196,7 +196,8 @@ module ccv_logic {
     const CcvTimeoutTimestamp: int
 
     // ===================
-    // PROTOCOL LOGIC
+    // PROTOCOL LOGIC contains the meat of the protocol
+    // functions here roughly correspond to API calls that can be triggered from external sources
     // ===================
     
     // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
@@ -238,6 +239,159 @@ module ccv_logic {
         }
     }
 
+    // Ends a block on the provider. This means that the current validator set is committed on chain,
+    // packets are queued, and the next block is started.
+    pure def endAndBeginBlockForProvider(
+        currentState: ProtocolState,
+        // by how much the timestamp should be advanced,
+        // i.e. the timestamp for the next block is oldTimestamp + timeAdvancement
+        timeAdvancement: Timestamp,
+        // a set of consumers that were unused before, but should be set to running now.
+        consumersToStart: Set[Chain],
+        // a set of consumers that were running before, but should be set to stopped now.
+        consumersToStop: Set[Chain]): Result = {
+        // commit the current running validator set on chain
+        val currentProviderState = currentState.providerState
+        val newChainState = currentProviderState.chainState.endAndBeginBlockShared(timeAdvancement)
+        // modify the states of the consumers that should be started/stopped
+        val res = currentProviderState.consumerStatus.getNewConsumerStatusMap(consumersToStart, consumersToStop)
+        val newConsumerStatus = res._1
+        val err = res._2
+        if (err != "") {
+            Err(err)
+        } else {
+            val newProviderState = currentProviderState.with(
+                "chainState", newChainState
+            ).with(
+                "consumerStatus", newConsumerStatus
+            )
+            val providerStateAfterSending =
+            if (currentProviderState.providerValidatorSetChangedInThisBlock and getRunningConsumers(currentState.providerState).size() > 0) {
+                    newProviderState.sendVscPackets()
+                } else {
+                    newProviderState
+                }
+            Err("not implemented")
+        }
+    }
+
+    pure def endAndBeginBlockForConsumer(
+        currentState: ProtocolState,
+        chain: Chain,
+        // by how much the timestamp of the chain should be advanced for the next block
+        timeAdvancement: Timestamp): Result = {
+            if (currentState.consumerStates.keys().contains(chain)) {
+                Err("chain is not a consumer")
+            } else {
+                // if the chain is not a consumer, return an error
+                val currentConsumerState = currentState.consumerStates.get(chain)
+                val newChainState = currentConsumerState.chainState.endAndBeginBlockShared(timeAdvancement)
+                val newConsumerState = currentConsumerState.with(
+                    "chainState", newChainState
+                )
+                val maturedPackets = newConsumerState.maturationTimes.keys().filter(
+                    packet => 
+                    val maturationTime = newConsumerState.maturationTimes.get(packet)
+                    maturationTime <= newChainState.lastTimestamp
+                )
+                val newMaturationTimes = newConsumerState.maturationTimes.mapRemoveAll(maturedPackets)
+                val newOutstandingPackets = newConsumerState.outstandingPacketsToProvider.concat(
+                    maturedPackets.map(
+                        packet => {
+                            id: packet.id, 
+                            sendingTime: newConsumerState.chainState.lastTimestamp
+                        }
+                    ).toList()
+                )
+                val newConsumerState2 = newConsumerState.with(
+                    "maturationTimes", newMaturationTimes
+                ).with(
+                    "outstandingPacketsToProvider", newOutstandingPackets
+                )
+                val newConsumerStates = currentState.consumerStates.set(chain, newConsumerState2)
+                val newState = currentState.with(
+                    "consumerStates", newConsumerStates
+                )
+                Ok(newState)
+            }
+    }
+
+    // ===================
+    // UTILITY FUNCTIONS
+    // which do not hold the core logic of the protocol, but are still part of it
+    // ===================
+
+    pure def getRunningConsumersFromMap(consumerStatus: Chain -> str): Set[Chain] = {
+        consumerStatus.keys().filter(
+            chain => consumerStatus.get(chain) == RUNNING
+        )
+    }
+
+    pure def getStoppedConsumersFromMap(consumerStatus: Chain -> str): Set[Chain] = {
+        consumerStatus.keys().filter(
+            chain => consumerStatus.get(chain) == STOPPED
+        )
+    }
+
+    // Returns the new ConsumerStatusMap according to the consumers to start/stop.
+    // The second return is an error string: If it is not equal to "",
+    // it contains an error message, and the first return should be ignored.
+    pure def getNewConsumerStatusMap(
+        currentConsumerStatusMap: Chain -> str,
+        consumersToStart: Set[Chain],
+        consumersToStop: Set[Chain]): (Chain -> str, str) = {
+            val runningConsumers = getRunningConsumersFromMap(currentConsumerStatusMap)
+            val stoppedConsumers = getStoppedConsumersFromMap(currentConsumerStatusMap)
+            // if a consumer is both started and stopped, this is an error
+            if (consumersToStart.intersect(consumersToStop).size() > 0) {
+                (currentConsumerStatusMap, "Cannot start and stop a consumer at the same time")
+            } else {
+                // if a consumer is started, it must be unused
+                if (consumersToStart.intersect(runningConsumers).size() > 0) {
+                    (currentConsumerStatusMap, "Cannot start a consumer that is already running")
+                } else {
+                    // if a consumer is stopped, it must be running
+                    if (consumersToStop.intersect(stoppedConsumers).size() > 0) {
+                        (currentConsumerStatusMap, "Cannot stop a consumer that is not running")
+                    } else {
+                        // if a consumer is started, it must be unused
+                        val newConsumerStatusMap = currentConsumerStatusMap.keys().mapBy(
+                            (chain) => 
+                            if (consumersToStart.contains(chain)) {
+                                RUNNING
+                            } else if (consumersToStop.contains(chain)) {
+                                STOPPED
+                            } else {
+                                currentConsumerStatusMap.get(chain)
+                            }
+                        )
+                        (newConsumerStatusMap, "")
+                    }
+                }
+            }
+        }
+
+    // Takes the currentValidatorSet and puts it as the newest set of the voting history
+    pure def enterCurValSetIntoBlock(chainState: ChainState): ChainState = {
+        chainState.with(
+            "votingPowerHistory", chainState.votingPowerHistory.prepend(
+                chainState.currentValidatorSet
+            )
+        )
+    }
+
+    // Advances the timestamp in the chainState by timeAdvancement
+    pure def advanceTime(chainState: ChainState, timeAdvancement: Timestamp): ChainState = {
+        chainState.with(
+            "lastTimestamp", chainState.lastTimestamp + timeAdvancement
+        )
+    }
+
+    // common logic to update the chain state, used by both provider and consumers.
+    pure def endAndBeginBlockShared(chainState: ChainState, timeAdvancement: Timestamp): ChainState = {
+        chainState.enterCurValSetIntoBlock().advanceTime(timeAdvancement)
+    }
+
     // returns the providerState with the following modifications:
     // * sends VSCPackets to all running consumers
     // * increments the runningVscId
@@ -283,40 +437,6 @@ module ccv_logic {
             ) 
     }
 
-    // Ends a block on the provider. This means that the current validator set is committed on chain,
-    // packets are queued, and the next block is started.
-    pure def endAndBeginBlockForProvider(
-        currentState: ProtocolState,
-        chain: Chain,
-        // by how much the timestamp should be advanced,
-        // i.e. the timestamp for the next block is oldTimestamp + timeAdvancement
-        timeAdvancement: Timestamp): Result = {
-        // commit the current running validator set on chain
-        val currentProviderState = currentState.providerState
-        val newChainState = currentProviderState.chainState.with(
-            "votingPowerHistory", currentProviderState.chainState.votingPowerHistory.prepend(
-                currentProviderState.chainState.currentValidatorSet
-            )
-        ).with(
-            // advance the time
-            "lastTimestamp", currentProviderState.chainState.lastTimestamp + timeAdvancement
-        )
-        val newProviderState = currentProviderState.with(
-            "chainState", newChainState
-        )
-        val providerStateAfterSending =
-         if (currentProviderState.providerValidatorSetChangedInThisBlock and getRunningConsumers(currentState.providerState).size() > 0) {
-                newProviderState.sendVscPackets()
-            } else {
-                newProviderState
-            }
-        Err("not implemented")
-    }
-
-    // ===================
-    // UTILITY FUNCTIONS
-    // ===================
-
     // receives a given packet (sent by the provider) on the consumer. The arguments are the consumer chain that is receiving the packet, and the packet itself.
     // To receive a packet, modify the running validator set (not the one entered into the block yet,
     // but the candidate that would be put into the block if it ended now)

From 7b489feefb1a14c660743ec25702f792dce7789f Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Tue, 26 Sep 2023 08:55:40 +0200
Subject: [PATCH 20/80] Start adding state machine module

---
 tests/difference/core/quint_model/ccv.qnt     | 857 ++++++------------
 .../core/quint_model/extraSpells.qnt          |  18 +
 tests/difference/core/quint_model/time.qnt    |  13 +
 3 files changed, 296 insertions(+), 592 deletions(-)
 create mode 100644 tests/difference/core/quint_model/time.qnt

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 586c132ac6..43c8f9098d 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -1,29 +1,12 @@
-module ccv_logic {
-    import extraSpells.* from "./extraSpells"
-
-    // Things that are not modelled:
-    // * Reward distribution
-    // * Starting/Stopping chains during execution
-    // * Slashes
-
-    // Things that explicitly are modelled:
-    // * Validator set changes are propagated from provider to consumers
-    // * VSC packets mature
+module CCVTypes {
+    import Time.* from "./Time"
 
-    // We assume that packet receive + ack happen synchronously, 
-    // i.e. when the packet is delivered, the ack is delivered right afterwards.
-    // This is because it is nontrivial in practice to get a relayer to relay a packet, but not its ack.
-    
-    // ===================
-    // TYPE DEFINITIONS
-    // ===================
     type Node = str
     type Chain = str
     type Power = int
     type VSCId = int
     type ValidatorSet = Node -> Power
     type Height = int
-    type Timestamp = int
     // a list of validator sets per blocks, ordered by recency
     type VotingPowerHistory = List[ValidatorSet]
 
@@ -34,7 +17,7 @@ module ccv_logic {
             // the new validator set. in the implementation, this would be a list of validator updates
             validatorSet: ValidatorSet,
             // the time at which the packet was sent. used to check whether packets have timed out.
-            sendingTime: Timestamp
+            sendingTime: Time
         }
 
     type VSCMaturedPacket = 
@@ -42,7 +25,7 @@ module ccv_logic {
             // the id of the VSCPacket that matured
             id: VSCId,
             // the time at which the packet was sent. used to check whether packets have timed out.
-            sendingTime: Timestamp
+            sendingTime: Time
         }
 
 
@@ -59,9 +42,17 @@ module ccv_logic {
         currentValidatorSet: ValidatorSet,
 
         // the latest timestamp that was comitted on chain
-        lastTimestamp: Timestamp,
+        lastTimestamp: Time,
     }
 
+    // utility function: returns a chain state that is initialized minimally.
+    pure def GetEmptyChainState(): ChainState = 
+        {
+            votingPowerHistory: List(),
+            currentValidatorSet: Map(),
+            lastTimestamp: 0,
+        }
+
     // Defines the current state of the provider chain. Essentially, all information here is stored by the provider on-chain (or could be derived purely by information that is on-chain).
     type ProviderState =
         {
@@ -80,7 +71,7 @@ module ccv_logic {
             sentVSCPackets: Chain -> Set[VSCPacket],
 
             // a mapping from (chainId, vscId) tuples to the timestamps of sent VSCPackets.
-            vscSendTimestamps: (Chain, VSCId) -> Timestamp,
+            vscSendTimestamps: (Chain, VSCId) -> Time,
 
             // stores whether, in this block, the validator set has changed.
             // this is needed because the validator set might be considered to have changed, even though
@@ -97,13 +88,27 @@ module ccv_logic {
             runningVscId: int,
         }
 
+    // utility function: returns a provider state that is initialized minimally.
+    pure def GetEmptyProviderState(): ProviderState = 
+        {
+            chainState: GetEmptyChainState,
+            outstandingPacketsToConsumer: Map(),
+            receivedMaturations: Set(),
+            sentVSCPackets: Map(),
+            vscSendTimestamps: Map(),
+            providerValidatorSetChangedInThisBlock: false,
+            consumerStatus: Map(),
+            runningVscId: 0,
+        }
+        
+
     // Defines the current state of a consumer chain. This information is accessible to that consumer on-chain.
     type ConsumerState = {
         // the state that each chain needs to store
         chainState: ChainState,
 
         // Stores the maturation times for VSCPackets received by this consumer
-        maturationTimes: VSCPacket -> Timestamp,
+        maturationTimes: VSCPacket -> Time,
 
         // Stores the list of packets that have been sent to the provider chain by this consumer
         // and have not been received yet.
@@ -112,6 +117,14 @@ module ccv_logic {
         outstandingPacketsToProvider: List[VSCMaturedPacket],
     }
 
+    // utility function: returns a consumer state that is initialized minimally.
+    pure def GetEmptyConsumerState(): ConsumerState = 
+        {
+            chainState: GetEmptyChainState,
+            maturationTimes: Map(),
+            outstandingPacketsToProvider: List(),
+        }
+
     // the state of the protocol consists of the composition of the state of one provider chain with potentially many consumer chains.
     type ProtocolState = {
         providerState: ProviderState,
@@ -180,11 +193,36 @@ module ccv_logic {
     // given as a pure val so that we can switch cases based on
     // whether a chain is the provider or not
     pure val PROVIDER_CHAIN = "provider"
+}
+
+module CCV {
+    // Implements the core logic of the cross-chain validation protocol.
+
+    // Things that are not modelled:
+    // * Reward distribution
+    // * Starting/Stopping chains during execution
+    // * Slashes
+
+    // Things that explicitly are modelled:
+    // * Validator set changes are propagated from provider to consumers
+    // * VSC packets mature
+
+    // We assume that packet receive + ack happen synchronously, 
+    // i.e. when the packet is delivered, the ack is delivered right afterwards.
+    // This is because it is nontrivial in practice to get a relayer to relay a packet, but not its ack.
+    
+    import extraSpells.* from "./extraSpells"
+    import Time.* from "./Time"
+    import CCVTypes.*
+  
 
     // ===================
     // PROTOCOL PARAMETERS
     // ===================
 
+    // the set of all possible consumer chains.
+    const ConsumerChains: Set[Chain]
+
     // For each chain, this defines the time between the initiation of an unbonding and its maturation.
     const UnbondingPeriodPerChain: Chain -> int
 
@@ -192,8 +230,8 @@ module ccv_logic {
     // corresponding VSCMaturedPacket, without timing out the consumer chain and consequently removing it.
     const VscTimeout: int
 
-    // The timeoutTimestamp for sending CCV packets.
-    const CcvTimeoutTimestamp: int
+    // The timeoutTimestamp for sent packets. Can differ by chain.
+    const CcvTimeoutPeriod: Chain -> int
 
     // ===================
     // PROTOCOL LOGIC contains the meat of the protocol
@@ -239,13 +277,39 @@ module ccv_logic {
         }
     }
 
+    // Delivers the next queued VSCPacket from the provider chain to a consumer chain.
+    // Only argument is the consumer chain, to which the packet will be delivered.
+    pure def deliverPacketToConsumer(currentState: ProtocolState, receiver: Chain): Result = {
+        if (not(isCurrentlyConsumer(receiver, currentState.providerState))) {
+            Err("Receiver is not currently a consumer - must have 'running' status!")
+        } else if (length(currentState.providerState.outstandingPacketsToConsumer.get(receiver)) == 0) {
+            Err("No outstanding packets to deliver")
+        } else {
+            val packet = currentState.providerState.outstandingPacketsToConsumer.get(receiver).head()
+            val result = recvPacketOnConsumer(currentState, receiver, packet)
+            val tmpState = result.newState
+            if (result.hasError) {
+                Err(result.error.message)
+            } else {
+                val result2 = removeOutstandingPacketFromProvider(tmpState, receiver)
+                val tmpState2 = result2.newState
+                val err2 = result2.error
+                if (result2.hasError) {
+                    Err(err2.message)
+                } else {
+                    Ok(tmpState2)
+                }
+            }
+        }
+    }
+
     // Ends a block on the provider. This means that the current validator set is committed on chain,
     // packets are queued, and the next block is started.
     pure def endAndBeginBlockForProvider(
         currentState: ProtocolState,
         // by how much the timestamp should be advanced,
         // i.e. the timestamp for the next block is oldTimestamp + timeAdvancement
-        timeAdvancement: Timestamp,
+        timeAdvancement: Time,
         // a set of consumers that were unused before, but should be set to running now.
         consumersToStart: Set[Chain],
         // a set of consumers that were running before, but should be set to stopped now.
@@ -279,7 +343,7 @@ module ccv_logic {
         currentState: ProtocolState,
         chain: Chain,
         // by how much the timestamp of the chain should be advanced for the next block
-        timeAdvancement: Timestamp): Result = {
+        timeAdvancement: Time): Result = {
             if (currentState.consumerStates.keys().contains(chain)) {
                 Err("chain is not a consumer")
             } else {
@@ -381,14 +445,14 @@ module ccv_logic {
     }
 
     // Advances the timestamp in the chainState by timeAdvancement
-    pure def advanceTime(chainState: ChainState, timeAdvancement: Timestamp): ChainState = {
+    pure def advanceTime(chainState: ChainState, timeAdvancement: Time): ChainState = {
         chainState.with(
             "lastTimestamp", chainState.lastTimestamp + timeAdvancement
         )
     }
 
     // common logic to update the chain state, used by both provider and consumers.
-    pure def endAndBeginBlockShared(chainState: ChainState, timeAdvancement: Timestamp): ChainState = {
+    pure def endAndBeginBlockShared(chainState: ChainState, timeAdvancement: Time): ChainState = {
         chainState.enterCurValSetIntoBlock().advanceTime(timeAdvancement)
     }
 
@@ -501,6 +565,22 @@ module ccv_logic {
         Ok(newState)
     }
 
+    // removes the oldest outstanding packet (to the given consumer) from the provider.
+    // on-chain, this would happen when the packet is acknowledged.
+    // only the oldest packet can be removed, since we model ordered channels.
+    pure def removeOutstandingPacketFromProvider(currentState: ProtocolState, receiver: Chain): Result = {
+        val currentOutstandingPackets = currentState.providerState.outstandingPacketsToConsumer.get(receiver)
+        val newOutstandingPackets = currentOutstandingPackets.tail()
+        val newProviderState = currentState.providerState.with(
+            "outstandingPacketsToConsumer", 
+            currentState.providerState.outstandingPacketsToConsumer.set(receiver, newOutstandingPackets)
+        )
+        val newState = currentState.with(
+            "providerState", newProviderState
+        )
+        Ok(newState)
+    }
+
     // Updates the given oldValidatorSet by setting the validator to newVotingPower.
     // If newVotingPower is zero, the validator is removed.
     pure def getUpdatedValidatorSet(oldValidatorSet: ValidatorSet, validator: Node, newVotingPower: int): ValidatorSet =
@@ -535,570 +615,163 @@ module ccv_logic {
             chain => providerState.consumerStatus.get(chain) == RUNNING
         )
     }
-}
 
-module ccv_tests {
-    import ccv_logic.*
-
-    // // UTILITY FUNCTIONS & ACTIONS
-    // def wasValidatorSetOnProvider(validatorSet: ValidatorSet): bool = {
-    //     votingPowerHistories.get(ProviderChain).toSet().exists(
-    //         historicalValSet => historicalValSet == validatorSet
-    //     )
-    // }
-
-    // def getCurrentValidatorSet(chain: Chain): ValidatorSet = 
-    //     votingPowerHistories.get(chain).head()
-
-    // // returns true if the consumer has timed out and should be dropped
-    // def consumerTimedOut(consumer: Chain): bool =
-    //     any {
-    //         // either a package from provider to consumer has timed out
-    //         outstandingPacketsToConsumer.get(consumer).select(
-    //             packet => packet.timeout <= curChainTimes.get(consumer)
-    //         ).length() > 0,
-    //         // or a package from consumer to provider has timed out
-    //         outstandingPacketsToProvider.get(consumer).select(
-    //             packet => packet.timeout <= curChainTimes.get(ProviderChain)
-    //         ).length() > 0,
-    //         // or the inactivity timeout has passed since a VSCPacket was sent to the consumer, but the
-    //         // provider has not received a VSCMaturedPacket for it
-    //         val packetsWithoutResponse = sentVSCPackets.get(consumer).filter( // get packets without response
-    //             packet => 
-    //             not(receivedMaturations.exists(
-    //                 maturedPacket => maturedPacket.id == packet.id
-    //             ))
-    //         )
-    //         // among those, get packets where inactivity timeout has passed
-    //         packetsWithoutResponse.filter(
-    //             packet => 
-    //             val sentAt = curChainTimes.get(ProviderChain) - PacketTimeout // compute when the packet was sent
-    //             val timesOutAt = sentAt + InactivityTimeout // compute when the packet times out
-    //             timesOutAt <= curChainTimes.get(ProviderChain)
-    //         ).size() > 0
-    //     }
-
-    // // utility action that leaves all provider state untouched
-    // action PROVIDER_NOOP(): bool = 
-    //     all {
-    //         receivedMaturations' = receivedMaturations,
-    //     }
-
-    // // utility action that leaves all consumer state untouched
-    // action CONSUMER_NOOP(): bool = 
-    //     all {
-    //         maturationTimes' = maturationTimes,
-    //     }
-    
+    // Returns whether the consumer has timed out, and an error message.
+    // If the second return is not equal to "", the first return should be ignored.
+    // If it is equal to "", the first return will be true if the consumer has timed out and should be dropped,
+    // or false otherwise.
+    def consumerTimedOut(currentState: ProtocolState, consumer: Chain): (bool, str) =
+        // check for errors: the consumer is not running
+        if (not(isCurrentlyConsumer(consumer, currentState.providerState))) {
+            (false, "Consumer is not currently a consumer - must have 'running' status!")
+        } else {
+            val providerState = currentState.providerState
+            val consumerState = currentState.consumerStates.get(consumer)
 
-    // // MODEL ACTIONS
-
-    // // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
-    // // e.g. via undelegations, or delegations, ...
-    // action doVotingPowerChange(validator: Node, amount: int): bool =
-    //     // for the provider chain, we need to adjust the voting power history
-    //     // by adding a new set
-    //     all {
-    //         amount >= 0,
-    //         val newValidatorSet = getCurrentValidatorSet(ProviderChain).getUpdatedValidatorSet(validator, amount)
-    //         // set the running validator set on the provider chain, but don't update the history yet
-    //         runningValidatorSet' = runningValidatorSet.set(ProviderChain, newValidatorSet),
-    //         // no packets are sent yet, these are only sent on endAndBeginBlock
-    //         RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-    //         outstandingPacketsToProvider' = outstandingPacketsToProvider,
-    //         receivedMaturations' = receivedMaturations,
-    //         CONSUMER_NOOP,
-    //         // voting power history is only updated on endAndBeginBlock
-    //         votingPowerHistories' = votingPowerHistories,
-    //         // consumer statusses do not change
-    //         consumerStatus' = consumerStatus,
-    //         // chain times do not change
-    //         curChainTimes' = curChainTimes,
-    //         // the validator set is considered to have changed
-    //         providerValidatorSetChangedInThisBlock' = true,
-    //     }
-
-    // // deliver the next outstanding packet from the consumer to the provider.
-    // // since this model assumes a single provider chain, this just takes a single chain as argument.
-    // action recvPacketOnProvider(consumer: Chain): bool = all {
-    //     // ensure there is a packet to be received
-    //     outstandingPacketsToProvider.get(consumer).length() > 0,
-    //     // remove packet from outstanding packets
-    //     val newPacketQueue = outstandingPacketsToProvider.get(consumer).tail()
-    //     outstandingPacketsToProvider' = outstandingPacketsToProvider.set(consumer, newPacketQueue),
-    //     // register the packet as received
-    //     val maturedPacket = outstandingPacketsToProvider.get(consumer).head()
-    //     receivedMaturations' = receivedMaturations.add(maturedPacket),
-    //     CONSUMER_NOOP,
-    //     RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-    //     votingPowerHistories' = votingPowerHistories,
-    //     // no validator set changes are made
-    //     runningValidatorSet' = runningValidatorSet,
-    //     // consumer statusses do not change
-    //     consumerStatus' = consumerStatus,
-    //     // chain times do not change
-    //     curChainTimes' = curChainTimes,
-    //     // the validator set was not changed by this action (but might have been changed before in this block)
-    //     providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
-    // }
-
-    // // deliver the next outstanding packet from the provider to the consumer.
-    // // since this model assumes a single provider chain, this just takes a single chain as argument.
-    // action recvPacketOnConsumer(consumer: Chain): bool = all {
-    //     // ensure there is a packet to be received
-    //     outstandingPacketsToConsumer.get(consumer).length() > 0,
-    //     // remove packet from outstanding packets
-    //     val newPacketQueue = outstandingPacketsToConsumer.get(consumer).tail()
-    //     val newOutstandingPackets = outstandingPacketsToConsumer.set(consumer, newPacketQueue)
-    //     RegisterNewOutstandingPackets(newOutstandingPackets),
-    //     val packet = outstandingPacketsToConsumer.get(consumer).head()
-    //     all {
-    //         // update the running validator set, but not the history yet,
-    //         // as that only happens when the next block is started
-    //         runningValidatorSet' = runningValidatorSet.set(consumer, packet.validatorSet),
-    //         // add the new packet and store its maturation time
-    //         val newMaturationTimes = maturationTimes.get(consumer).put(packet, curChainTimes.get(consumer) + UnbondingPeriod.get(consumer))
-    //         maturationTimes' = maturationTimes.set(consumer, newMaturationTimes)
-    //     },
-    //     PROVIDER_NOOP,
-    //     votingPowerHistories' = votingPowerHistories,
-    //     outstandingPacketsToProvider' = outstandingPacketsToProvider,
-    //     // consumer statusses do not change
-    //     consumerStatus' = consumerStatus,
-    //     // chain times do not change
-    //     curChainTimes' = curChainTimes,
-    //     // the validator set was not changed by this action (but might have been changed before in this block)
-    //     providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
-    // }
-
-    // // ends the current block and starts the next block for a given chain.
-    // action endAndBeginBlock(chain: Chain): bool = any {
-    //     all {
-    //       chain == ProviderChain,
-    //       endAndBeginBlockForProvider,
-    //     },
-    //     all {
-    //         chain != ProviderChain,
-    //         endAndBeginBlockForConsumer(chain),
-    //     }
-    // }
-
-    // // gets the updated history for the current chain when ending a block, i.e. the
-    // // running validator set is added to the history if different from the last one.
-    // def getUpdatedHistory(chain: Chain): List[ValidatorSet] =
-    //     // update voting power history if the validator set changed
-    //     val newValidatorSet = runningValidatorSet.get(ProviderChain)
-    //     val oldValidatorSet = votingPowerHistories.get(ProviderChain).head()
-    //     if (newValidatorSet != oldValidatorSet) 
-    //         votingPowerHistories.get(ProviderChain).prepend(newValidatorSet)
-    //     else
-    //         votingPowerHistories.get(ProviderChain)
-
-
-    // action endAndBeginBlockForProvider(): bool = all {
-    //     // update the voting power history
-    //     votingPowerHistories' = votingPowerHistories.set(ProviderChain, getUpdatedHistory(ProviderChain)),
-    //     // the running validator set is now for sure the current validator set,
-    //     // so start with it in the next block
-    //     runningValidatorSet' = runningValidatorSet,
-    //     // send VSCPackets to consumers
-    //     val newOutstandingPackets = 
-    //         // if running validator set is considered to have changed
-    //         if (providerValidatorSetChangedInThisBlock)
-    //             // then send a packet to each running consumer
-    //             outstandingPacketsToConsumer.keys().mapBy(
-    //                 (consumer) => 
-    //                 val packetQueue = outstandingPacketsToConsumer.get(consumer)
-    //                 if (consumerStatus.get(consumer) == RUNNING) {
-    //                     packetQueue.append(
-    //                         {
-    //                             id: packetQueue.length(),
-    //                             validatorSet: runningValidatorSet.get(ProviderChain),
-    //                             timeout: curChainTimes.get(ProviderChain) + PacketTimeout
-    //                         }
-    //                     )
-    //                 } else {
-    //                     packetQueue
-    //                 }
-    //             )
-    //         else
-    //             // otherwise, don't send any packets
-    //             outstandingPacketsToConsumer
-    //     RegisterNewOutstandingPackets(newOutstandingPackets),
-    //     CONSUMER_NOOP,
-    //     // no packets are sent to the provider
-    //     outstandingPacketsToProvider' = outstandingPacketsToProvider,
-    //     // do not receive any maturations
-    //     receivedMaturations' = receivedMaturations,
-    //     // consumer statusses do not change
-    //     consumerStatus' = consumerStatus,
-    //     // chain times do not change
-    //     curChainTimes' = curChainTimes,
-    //     // the validator set was definitely not changed in the new block yet, so set to false
-    //     providerValidatorSetChangedInThisBlock' = false
-    // }
-
-    // action endAndBeginBlockForConsumer(consumer: Chain): bool = all {
-    //     ConsumerChains.contains(consumer),
-    //     // update the voting power history
-    //     votingPowerHistories' = votingPowerHistories.set(consumer, getUpdatedHistory(consumer)),
-    //     // the running validator set is now for sure the current validator set,
-    //     // so start with it in the next block
-    //     runningValidatorSet' = runningValidatorSet,
-    //     // compute mature packets whose maturation time has passed
-    //     val maturedPackets = maturationTimes.get(consumer).keys().filter(
-    //         packet => 
-    //         val maturationTime = maturationTimes.get(consumer).get(packet)
-    //         maturationTime <= curChainTimes.get(consumer)
-    //     )
-    //     all {
-    //         // remove matured packets from the maturation times
-    //         maturationTimes' = maturationTimes.set(consumer, maturationTimes.get(consumer).mapRemoveAll(maturedPackets)),
-    //         // send matured packets
-    //         outstandingPacketsToProvider' = outstandingPacketsToProvider.set(
-    //             consumer, 
-    //             // construct VSCMaturedPackets from the matured VSCPackets
-    //             outstandingPacketsToProvider.get(consumer).concat(
-    //                 maturedPackets.map(packet => {id: packet.id, timeout: 5}).toList()
-    //             )
-    //         )
-    //     },
-    //     PROVIDER_NOOP,
-    //     // no packets are sent to consumer or received by it
-    //     RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-    //     // consumer statusses do not change
-    //     consumerStatus' = consumerStatus,
-    //     // chain times do not change
-    //     curChainTimes' = curChainTimes,
-    //     // the validator set was not changed by this action (but might have been changed before in this block)
-    //     // also, this is only a new block for a consumer, so the change variable shouldn't be reset
-    //     providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
-    // }
-
-    // // advance timestamps for maps nondeterministically
-    // action AdvanceTime(): bool = 
-    //         val advanceAmounts = curChainTimes.keys().mapBy(
-    //             chain =>    
-    //             nondet amount = oneOf(1.to(10))
-    //             amount
-    //         )
-    //         AdvanceTimeByMap(advanceAmounts)
-
-    // // the timestamp for each chain is advanced by the given amount
-    // action AdvanceTimeByMap(advancementAmount: Chain -> int): bool = all
-    //     {
-    //         curChainTimes' = curChainTimes.keys().mapBy(
-    //             chain => 
-    //             curChainTimes.get(chain) + advancementAmount.get(chain)
-    //         ),
-    //         // all other variables are left untouched
-    //         votingPowerHistories' = votingPowerHistories,
-    //         runningValidatorSet' = runningValidatorSet,
-    //         outstandingPacketsToProvider' = outstandingPacketsToProvider,
-    //         RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-    //         receivedMaturations' = receivedMaturations,
-    //         maturationTimes' = maturationTimes,
-    //         // chain times do not change
-    //         consumerStatus' = consumerStatus,
-    //         // the validator set was not changed by this action (but might have been changed before in this block)
-    //         providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
-    //     }
-
-    // // each consumer chain may advance in the order
-    // // some events may necessitate a transition, e.g. timeouts.
-    // // shouldAdvance gives, for each consumer chain, whether it should advance if possible.
-    // // if a chain has to advance, e.g. due to timeouts, or may not advance, the value will have no effect.
-    // action AdvanceConsumers(shouldAdvance: Chain -> bool): bool = 
-    //     val newConsumerStatus = consumerStatus.keys().mapBy(
-    //         chain => 
-    //         val curStatus = consumerStatus.get(chain)
-    //         if (curStatus == UNUSED) {
-    //             if (shouldAdvance.get(chain))
-    //             {
-    //                 RUNNING
-    //             } else {
-    //                 UNUSED
-    //             }
-    //         }
-    //         else if (curStatus == RUNNING) {
-    //             // the chain may transition to stopped.
-    //             // it is *forced* to stop if a packet timed out,
-    //             // or if the inactivity timeout has passed
-    //             if(consumerTimedOut(chain)) {
-    //                 STOPPED
-    //             } else {
-    //                 if (shouldAdvance.get(chain)) {
-    //                     RUNNING
-    //                 } else {
-    //                     STOPPED
-    //                 }
-    //             }
-    //         } else {
-    //             // stopped chains cannot restart, we assume a new chain would be started in that case
-    //             STOPPED
-    //         }
-    //         )
-    //     all {
-    //         consumerStatus' = newConsumerStatus,
-    //         // all other variables are left untouched
-    //         votingPowerHistories' = votingPowerHistories,
-    //         runningValidatorSet' = runningValidatorSet.keys().mapBy(
-    //             chain => 
-    //             if (newConsumerStatus.get(chain) == RUNNING and consumerStatus.get(chain) == UNUSED) 
-    //             // consumers that went from unused to running start with the current validator set on the provider
-    //             { 
-    //                 runningValidatorSet.get(ProviderChain) 
-    //             } else {
-    //                 runningValidatorSet.get(chain)
-    //             }
-    //         ),
-    //         outstandingPacketsToProvider' = outstandingPacketsToProvider,
-    //         RegisterNewOutstandingPackets(outstandingPacketsToConsumer),
-    //         receivedMaturations' = receivedMaturations,
-    //         maturationTimes' = maturationTimes,
-    //         // chain times do not change
-    //         curChainTimes' = curChainTimes,
-    //         // the validator set was not changed by this action (but might have been changed before in this block)
-    //         providerValidatorSetChangedInThisBlock' = providerValidatorSetChangedInThisBlock
-    //     }
-
-    // // Updates the outstandingPacketsToConsumer and sentVSCPackets variables
-    // action RegisterNewOutstandingPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
-    //     all {
-    //         outstandingPacketsToConsumer' = newOutstandingPackets,
-    //         StoreSentPackets(newOutstandingPackets),
-    //     }
-
-
-    // // stores the VSCPackets sent in this step in sentVSCPackets
-    // action StoreSentPackets(newOutstandingPackets: Chain -> List[VSCPacket]): bool = 
-    //     sentVSCPackets' = sentVSCPackets.keys().mapBy(
-    //         (chain) => 
-    //         sentVSCPackets.get(chain).union(newOutstandingPackets.get(chain).toSet())
-    //     )
+            // has a packe from provider to consumer timed out?
+            val outstandingPacketsToConsumer = providerState.outstandingPacketsToConsumer.get(consumer)
+            val providerToConsumerPacketTimedOut = outstandingPacketsToConsumer.head().sendingTime +
+                CcvTimeoutPeriod.get(PROVIDER_CHAIN) <= consumerState.chainState.lastTimestamp
 
-    
-    // // the main step action 
-    // action step: bool = any {
-    //     AdvanceTime,
-    //     nondet node = oneOf(Nodes)
-    //     nondet amount = oneOf(1.to(10))
-    //     votingPowerChange(node, amount),
-    //     recvPacketOnProvider(oneOf(ConsumerChains)),
-    //     recvPacketOnConsumer(oneOf(ConsumerChains)),
-    //     nondet chain = oneOf(chains)
-    //     endAndBeginBlock(chain),
-    //     val shouldAdvance = ConsumerChains.mapBy(
-    //         chain => 
-    //         nondet should = oneOf(Set(true, false))
-    //         should
-    //     )
-    //     AdvanceConsumers(shouldAdvance),
-    // }
-
-    // pure val nodePowerSet = Nodes.powerset()
-
-    // def getArbitraryValidatorSet(): ValidatorSet = 
-    //     nondet numValidators = oneOf(1.to(Nodes.size()))
-    //     // toList has nondeterministic behaviour, so this gets arbitrary validators
-    //     nondet validators = oneOf(nodePowerSet.filter(s => s.size() == numValidators))
-    //     validators.mapBy(
-    //         validator => 
-    //         nondet votingPower = oneOf(1.to(10))
-    //         votingPower
-    //     )
-
-    // // INITIALIZATION
-    // action init: bool = 
-    // all {
-    //     val validatorSets = chains.mapBy(
-    //         (chain) => 
-    //     // provider chain gets an arbitrary validator set, consumer chains have none
-    //         if (chain == ProviderChain) getArbitraryValidatorSet else Map()
-    //     )
-    //     all {
-    //         votingPowerHistories' = chains.mapBy(
-    //             (chain) => 
-    //             List(validatorSets.get(chain))
-    //         ),
-    //         runningValidatorSet' = validatorSets,
-    //     },
-    //     // each chain starts at time 0
-    //     curChainTimes' = chains.mapBy(
-    //         (chain) => 0
-    //     ),
-    //     // all consumer chains are unused
-    //     consumerStatus' = chains.mapBy(chain => UNUSED),
-    //     // no packets are outstanding
-    //     outstandingPacketsToProvider' = chains.mapBy(chain => List()),
-    //     outstandingPacketsToConsumer' = chains.mapBy(chain => List()),
-    //     // no maturations have been received by provider
-    //     receivedMaturations' = Set(),
-    //     // no packets have been sent to consumers
-    //     sentVSCPackets' = chains.mapBy(chain => Set()),
-    //     // no packets have been received by consumers, so no maturation times set
-    //     maturationTimes' = chains.mapBy(chain => Map()),
-    //     // validator set was not changed yet
-    //     providerValidatorSetChangedInThisBlock' = false
-    // }
-
-    // // PROPERTIES
-
-    // // Every validator set on any consumer chain MUST either be or
-    // // have been a validator set on the provider chain.
-    // val ValidatorSetReplication: bool = 
-    //     chains.forall(
-    //         chain => chain.getCurrentValidatorSet().wasValidatorSetOnProvider()
-    //     )
-
-    // // TESTS
-    // run VSCHappyPathTest: bool = {
-    //     init
-    //     // trigger a votingPowerChange on the provider chain
-    //     .then(votingPowerChange("A", 10))
-    //     // endAndBeginBlock on provider. No consumer chains are running, so no packets are sent
-    //     .then(endAndBeginBlock(ProviderChain))
-    //     .then(all {
-    //         // no packet was sent
-    //         assert(outstandingPacketsToConsumer.get("chain1").length() == 0),
-    //         // advance chain1 to running
-    //         AdvanceConsumers(NoStatusAdvancement.set("chain1", true))
-    //     })
-    //     // consumer chain should have current validator set from provider
-    //     .then(
-    //         all { 
-    //             // since consumer chain just started, its assumed to have the validator set from provider
-    //             assert(runningValidatorSet.get("chain1") == runningValidatorSet.get(ProviderChain)),
-    //             // trigger a votingPowerChange on the provider chain
-    //             votingPowerChange("B", 10)
-    //         }
-    //     )
-    //     .then(
-    //         val valSet = runningValidatorSet.get(ProviderChain)
-    //         endAndBeginBlock(ProviderChain)
-    //         // now the provider should send a packet on block end
-    //         .then(all {
-    //             // a packet was sent
-    //             assert(outstandingPacketsToConsumer.get("chain1").length() == 1),
-    //             // deliver the packet to the consumer
-    //             recvPacketOnConsumer("chain1")
-    //         })
-    //         .then(
-    //             // consumer needs to end a block before it has the new validator set
-    //             endAndBeginBlock("chain1")
-    //         )
-    //         .then(all {
-    //             // the consumer should have the new validator set
-    //             assert(runningValidatorSet.get("chain1") == valSet),
-    //             // put a last action to satisfy the action effect
-    //             AdvanceConsumers(NoStatusAdvancement)
-    //         })
-    //     )
-    // }
-
-    // // utility: the set of consumers currently running
-    // val RunningConsumers: Set[Chain] = 
-    //     ConsumerChains.filter(chain => consumerStatus.get(chain) == RUNNING)
-
-    // // MODEL STATE
-    // // --SHARED STATE
-
-    // // Stores, for each chain, the list of voting powers that corresponded to voting powers 
-    // // at blocks over its entire existence.
-    // // Voting powers should be ordered by recency in descending order.
-    // var votingPowerHistories: Chain -> List[ValidatorSet]
-
-    // // the current validator set on each chain.
-    // // this will be included in the next block, but might not be final yet,
-    // // e.g. there may be more modifications in the current block.
-    // var runningValidatorSet: Chain -> ValidatorSet
-
-    // // the current timestamp for each chain
-    // var curChainTimes: Chain -> Timestamp
-
-    // // stores, for each chain, its current status -
-    // // unused, running, or stopped
-    // var consumerStatus: Chain -> str
-
-    // // --CHANNELS
-    // // Stores, for each consumer chain, the list of packets that have been sent to the provider chain
-    // // and have not been received yet.
-    // var outstandingPacketsToProvider: Chain -> List[VSCMaturedPacket]
-
-    // // Stores, for each consumer chain, the list of packets that have been sent to the consumer chain
-    // // and have not been received yet.
-    // var outstandingPacketsToConsumer: Chain -> List[VSCPacket]
-
-
-    // // --CONSUMER STATE
-    // // Stores the maturation times for VSCPackets received by consumers
-    // var maturationTimes: Chain -> (VSCPacket -> Timestamp)
-
-    // // --PROVIDER STATE
-    // // the set of VSCMaturedPackets received by the provider chain
-    // var receivedMaturations: Set[VSCMaturedPacket]
-
-    // // stores which VSC Packets have been sent to compare with receivedMaturations to detect timeouts due to non-responsiveness
-    // var sentVSCPackets: Chain -> Set[VSCPacket]
-
-    // // stores whether, in this step, the validator set considered to be changed.
-    // // this is needed because the validator set might be considered to have changed, even though
-    // // it is still technically identical at our level of abstraction, e.g. a validator power change on the provider
-    // // might leave the validator set the same because a delegation and undelegation cancel each other out.
-    // var providerValidatorSetChangedInThisBlock: bool
-
-    // // utility: a struct summarizing the current state
-    // val state = 
-    //     {
-    //         votingPowerHistories: votingPowerHistories,
-    //         runningValidatorSet: runningValidatorSet,
-    //         curChainTimes: curChainTimes,
-    //         consumerStatus: consumerStatus,
-    //         outstandingPacketsToProvider: outstandingPacketsToProvider,
-    //         outstandingPacketsToConsumer: outstandingPacketsToConsumer,
-    //         maturationTimes: maturationTimes,
-    //         receivedMaturations: receivedMaturations,
-    //         sentVSCPackets: sentVSCPackets,
-    //     }
-
-    // // set of identifiers of potential nodes
-    // pure val Nodes: Set[Node] = 
-    //     Set("A", "B", "C", "D", "E", "F", "G", "H", "I", "J")
-
-    // // the set of consumer chains
-    // pure val ConsumerChains: Set[Chain] = 
-    //     Set("chain1", "chain2", "chain3")
-
-    // // The singular provider chain.
-    // pure val ProviderChain: Chain = 
-    //     "provider"
+            // has a packet from consumer to provider timed out?
+            val outstandingPacketsToProvider = consumerState.outstandingPacketsToProvider
+            val consumerToProviderPacketTimedOut = outstandingPacketsToProvider.head().sendingTime +
+                CcvTimeoutPeriod.get(consumer) <= providerState.chainState.lastTimestamp
+
+
+
+            (providerToConsumerPacketTimedOut, "")
+        }
         
-    // pure val chains = ConsumerChains.union(Set(ProviderChain))
-
-    // // length of the unbonding period on each chain
-    // pure val UnbondingPeriod: Chain -> int = chains.mapBy(
-    //     (chain) => 
-    //     10
-    // )
-
-    // // the time until a packet times out
-    // pure val PacketTimeout: int = 
-    //     5
-
-    // // the time until a consumer chain is dropped by the provider due to inactivity
-    // pure val InactivityTimeout: int =
-    //     10
-
-    // // utility: a map assigning each chain to 0, used for not advancing timestamps
-    // pure val NoTimeAdvancement: Chain -> int = chains.mapBy(
-    //     (chain) => 
-    //     0
-    // )
-
-
-    // // utility: a map assigning each chain to false, used for not advancing consumer status
-    // pure val NoStatusAdvancement: Chain -> bool = chains.mapBy(
-    //     (chain) => 
-    //     false
-    // )
+        // // either a package from provider to consumer has timed out
+        // currentState..get(consumer).select(
+        //     packet => packet.timeout <= curChainTimes.get(consumer)
+        // ).length() > 0,
+        // // or a package from consumer to provider has timed out
+        // outstandingPacketsToProvider.get(consumer).select(
+        //     packet => packet.timeout <= curChainTimes.get(ProviderChain)
+        // ).length() > 0,
+        // // or the inactivity timeout has passed since a VSCPacket was sent to the consumer, but the
+        // // provider has not received a VSCMaturedPacket for it
+        // val packetsWithoutResponse = sentVSCPackets.get(consumer).filter( // get packets without response
+        //     packet => 
+        //     not(receivedMaturations.exists(
+        //         maturedPacket => maturedPacket.id == packet.id
+        //     ))
+        // )
+        // // among those, get packets where inactivity timeout has passed
+        // packetsWithoutResponse.filter(
+        //     packet => 
+        //     val sentAt = curChainTimes.get(ProviderChain) - PacketTimeout // compute when the packet was sent
+        //     val timesOutAt = sentAt + InactivityTimeout // compute when the packet times out
+        //     timesOutAt <= curChainTimes.get(ProviderChain)
+        // ).size() > 0
+
+    // ===================
+    // ASSUMPTIONS ON MODEL PARAMETERS
+    // ===================
+
+    // the unbonding period is positive
+    run UnbondingPeriodPositiveTest =
+        UnbondingPeriodPerChain.keys().forall(chain => UnbondingPeriodPerChain.get(chain) > 0)
+
+    // the VSC timeout is positive
+    run VscTimeoutPositiveTest =
+        VscTimeout > 0
+
+    // the CCV timeout is positive
+    run CcvTimeoutPositiveTest =
+        CcvTimeoutPeriod.keys().forall(chain => CcvTimeoutPeriod.get(chain) > 0)
+
+    // ccv timeout on the provider **must** be larger than unbonding period on each chain
+    run CcvTimeoutLargerThanUnbondingPeriodTest =
+        CcvTimeoutPeriod.get(PROVIDER_CHAIN) > UnbondingPeriodPerChain.Values().Max()
+
+    // the provider chain is not a consumer chain
+    run ProviderNotConsumerTest =
+        not(ConsumerChains.contains(PROVIDER_CHAIN))
+
+    // ccv timeout contains only consumers and provider, no other chains
+    run CcvTimeoutSubsetTest =
+        CcvTimeoutPeriod.keys().forall(chain => ConsumerChains.contains(chain) or chain == PROVIDER_CHAIN)
+
+    // unbonding period contains consumers and provider, no other chains
+    def UnbondingPeriodInv = UnbondingPeriodPerChain.keys() == ConsumerChains.add(PROVIDER_CHAIN)
+
+    
+}
+
+// A basic state machine that utilizes the CCV protocol.
+// Still leaves constants unassigned, just defines the state machine logic in general,
+// i.e. regardless of how many chains there are, what the unbonding periods are, etc.
+module CCVStatemachinLogic {
+    import Time.* from "./Time"
+    import CCV as CCV
+    import CCVTypes.*
+
+    var currentState: ProtocolState
+
+    action init: bool = all {
+        val providerState = GetEmptyProviderState
+        val consumerStates = CCV::ConsumerChains.mapBy(chain => GetEmptyConsumerState)
+        currentState' = {
+            providerState: providerState,
+            consumerStates: consumerStates
+        }
+    }
+
+    action votingPowerChanges(validator: Node, amount: int): bool = 
+        val result = CCV::votingPowerChange(currentState, validator, amount)
+        all {
+        result.hasError == false,
+        currentState' = result.newState,
+    }
+
+    // The receiver receives the next outstanding VSCPacket from the provider.
+    action DeliverVSCPacket(receiver: Chain): bool = 
+        val result = CCV::deliverPacketToConsumer(currentState, receiver)
+        all {
+            result.hasError == false,
+            currentState' = result.newState,
+        }
+
+    action DeliverVSCMaturedPacket(sender: Chain): bool =
+        val result = CCV::deliverPacketToProvider(currentState, sender)
+        all {
+            result.hasError == false,
+            currentState' = result.newState,
+        }
+
+    action EndAndBeginBlockForProvider(
+        timeAdvancement: Time,
+        consumersToStart: Set[Chain],
+        consumersToStop: Set[Chain]): bool = 
+        val result = CCV::endAndBeginBlockForProvider(currentState, timeAdvancement, consumersToStart, consumersToStop)
+        all {
+            result.hasError == false,
+            currentState' = result.newState,
+        }
+
+    action EndAndBeginBlockForConsumer(
+        chain: Chain,
+        timeAdvancement: Time): bool = 
+        val result = CCV::endAndBeginBlockForConsumer(currentState, chain, timeAdvancement)
+        all {
+            result.hasError == false,
+            currentState' = result.newState,
+        }
+}
+
+module CCVDefaultStateMachine {
+    // A basic state machine that utilizes the CCV protocol.
+    import Time.* from "./Time"
+    import CCVTypes.*
+    import extraSpells.* from "./extraSpells"
+
+    pure val consumerChains = Set("consumer1", "consumer2", "consumer3")
+    pure val chains = consumerChains.add(PROVIDER_CHAIN)
+    pure val unbondingPeriods = chains.mapBy(chain => 2 * Week)
+    pure val ccvTimeouts = chains.mapBy(chain => 3 * Week)
+
+    import CCV(VscTimeout = 5 * Week, CcvTimeoutPeriod = unbondingPeriods, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = chains).*
 }
diff --git a/tests/difference/core/quint_model/extraSpells.qnt b/tests/difference/core/quint_model/extraSpells.qnt
index 32f565b16a..1d7d219640 100644
--- a/tests/difference/core/quint_model/extraSpells.qnt
+++ b/tests/difference/core/quint_model/extraSpells.qnt
@@ -176,4 +176,22 @@ module extraSpells {
         __set.union(Set(elem))
     }
 
+    pure def Values(__map: a -> b): Set[b] = {
+        __map.keys().fold(Set(), (__s, __k) => __s.add(__map.get(__k)))
+    }
+    run ValuesTest =
+    all {
+        assert(Values(Map(1 -> 2, 3 -> 4)) == Set(2, 4)),
+        assert(Values(Map()) == Set())
+    }
+
+    pure def Max(__set: Set[int]): int = {
+        __set.fold(0, (__m, __e) => max(__m, __e))
+    }
+
+    run MaxTest =
+    all {
+        assert(Max(Set(1, 2, 3)) == 3),
+        assert(Max(Set()) == 0)
+    }
 }
diff --git a/tests/difference/core/quint_model/time.qnt b/tests/difference/core/quint_model/time.qnt
new file mode 100644
index 0000000000..8497d8e1d3
--- /dev/null
+++ b/tests/difference/core/quint_model/time.qnt
@@ -0,0 +1,13 @@
+// A simple module for time that makes timings more readable,
+// e.g. 5 * Minute.
+// The base unit are seconds, i.e. to get the number of seconds in a time value, just treat it as an int.
+module Time {
+    type Time = int
+
+    pure val Second = 1    
+    pure val Minute = 60 * Second
+    pure val Hour = 60 * Minute
+    pure val Day = 24 * Hour
+    pure val Week = 7 * Day
+    pure val Year = 365 * Day
+}
\ No newline at end of file

From b992f8c305057d38482c0dd54006336fbb3d0364 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Tue, 26 Sep 2023 17:16:22 +0200
Subject: [PATCH 21/80] Save status with crashing effect checker

---
 tests/difference/core/quint_model/ccv.qnt | 326 ++++++++++++++--------
 1 file changed, 215 insertions(+), 111 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 43c8f9098d..e0f5753a79 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -68,10 +68,7 @@ module CCVTypes {
             receivedMaturations: Set[VSCMaturedPacket],
 
             // stores which VSC Packets have been sent to compare with receivedMaturations to detect timeouts due to non-responsiveness
-            sentVSCPackets: Chain -> Set[VSCPacket],
-
-            // a mapping from (chainId, vscId) tuples to the timestamps of sent VSCPackets.
-            vscSendTimestamps: (Chain, VSCId) -> Time,
+            sentVSCPackets: Chain -> List[VSCPacket],
 
             // stores whether, in this block, the validator set has changed.
             // this is needed because the validator set might be considered to have changed, even though
@@ -95,7 +92,6 @@ module CCVTypes {
             outstandingPacketsToConsumer: Map(),
             receivedMaturations: Set(),
             sentVSCPackets: Map(),
-            vscSendTimestamps: Map(),
             providerValidatorSetChangedInThisBlock: false,
             consumerStatus: Map(),
             runningVscId: 0,
@@ -173,7 +169,6 @@ module CCVTypes {
                     providerValidatorSetChangedInThisBlock: false,
                     consumerStatus: Map(),
                     runningVscId: 0,
-                    vscSendTimestamps: Map(),
                 },
                 consumerStates: Map(),
             },
@@ -231,7 +226,7 @@ module CCV {
     const VscTimeout: int
 
     // The timeoutTimestamp for sent packets. Can differ by chain.
-    const CcvTimeoutPeriod: Chain -> int
+    const CcvTimeout: Chain -> int
 
     // ===================
     // PROTOCOL LOGIC contains the meat of the protocol
@@ -253,6 +248,8 @@ module CCV {
 
     // Delivers the next queued VSCMaturedPacket from a consumer chain to the provider chain.
     // Only argument is the consumer chain, from which the packet will be delivered.
+    // If this packet will time out on the provider on delivery,
+    // the consumer will be dropped.
     pure def deliverPacketToProvider(currentState: ProtocolState, sender: Chain): Result = {
         if (not(isCurrentlyConsumer(sender, currentState.providerState))) {
             Err("Sender is not currently a consumer - must have 'running' status!")
@@ -260,18 +257,44 @@ module CCV {
             Err("No outstanding packets to deliver")
         } else {
             val packet = currentState.consumerStates.get(sender).outstandingPacketsToProvider.head()
-            val result = recvPacketOnProvider(currentState, sender, packet)
-            val tmpState = result.newState
-            if (result.hasError) {
-                Err(result.error.message)
+            // if the packet has timed out, drop the consumer. its state doesn't matter anymore
+            val timeout = CcvTimeout.get(sender)
+            if(packet.sendingTime + CcvTimeout.get(sender) > currentState.providerState.chainState.lastTimestamp) {
+                // drop consumer
+                val result = getNewConsumerStatusMap(
+                    currentState.providerState.consumerStatus,
+                    Set(),
+                    Set(sender)
+                )
+
+                val newConsumerStatus = result._1
+                val err = result._2
+                if (err != "") {
+                    Err(err)
+                } else {
+                    val newProviderState = currentState.providerState.with(
+                        "consumerStatus", newConsumerStatus
+                    )
+                    val newState = currentState.with(
+                        "providerState", newProviderState
+                    )
+                    Ok(newState)
+                }
             } else {
-                val result2 = removeOutstandingPacketFromConsumer(tmpState, sender)
-                val tmpState2 = result2.newState
-                val err2 = result2.error
-                if (result2.hasError) {
-                    Err(err2.message)
+                // the packet has not timed out, so receive it on the provider
+                val result = recvPacketOnProvider(currentState, sender, packet)
+                val tmpState = result.newState
+                if (result.hasError) {
+                    Err(result.error.message)
                 } else {
-                    Ok(tmpState2)
+                    val result2 = removeOutstandingPacketFromConsumer(tmpState, sender)
+                    val tmpState2 = result2.newState
+                    val err2 = result2.error
+                    if (result2.hasError) {
+                        Err(err2.message)
+                    } else {
+                        Ok(tmpState2)
+                    }
                 }
             }
         }
@@ -279,6 +302,8 @@ module CCV {
 
     // Delivers the next queued VSCPacket from the provider chain to a consumer chain.
     // Only argument is the consumer chain, to which the packet will be delivered.
+    // If this packet will time out on the consumer on delivery,
+    // the consumer will be dropped.
     pure def deliverPacketToConsumer(currentState: ProtocolState, receiver: Chain): Result = {
         if (not(isCurrentlyConsumer(receiver, currentState.providerState))) {
             Err("Receiver is not currently a consumer - must have 'running' status!")
@@ -286,25 +311,54 @@ module CCV {
             Err("No outstanding packets to deliver")
         } else {
             val packet = currentState.providerState.outstandingPacketsToConsumer.get(receiver).head()
-            val result = recvPacketOnConsumer(currentState, receiver, packet)
-            val tmpState = result.newState
-            if (result.hasError) {
-                Err(result.error.message)
+            // check if the consumer timed out
+            if (packet.sendingTime + CcvTimeout.get(PROVIDER_CHAIN) > currentState.consumerStates.get(receiver).chainState.lastTimestamp) {
+                // drop consumer
+                val result = getNewConsumerStatusMap(
+                    currentState.providerState.consumerStatus,
+                    Set(),
+                    Set(receiver)
+                )
+
+                val newConsumerStatus = result._1
+                val err = result._2
+                if (err != "") {
+                    Err(err)
+                } else {
+                    val newProviderState = currentState.providerState.with(
+                        "consumerStatus", newConsumerStatus
+                    )
+                    val newState = currentState.with(
+                        "providerState", newProviderState
+                    )
+                    // Ok(newState)
+                    Err("not implemented")
+                }
             } else {
-                val result2 = removeOutstandingPacketFromProvider(tmpState, receiver)
-                val tmpState2 = result2.newState
-                val err2 = result2.error
-                if (result2.hasError) {
-                    Err(err2.message)
+                // the packet has not timed out, so receive it on the consumer
+                val result = recvPacketOnConsumer(currentState, receiver, packet)
+                val tmpState = result.newState
+                if (result.hasError) {
+                    Err(result.error.message)
                 } else {
-                    Ok(tmpState2)
+                    val result2 = removeOutstandingPacketFromProvider(tmpState, receiver)
+                    val tmpState2 = result2.newState
+                    val err2 = result2.error
+                    if (result2.hasError) {
+                        Err(err2.message)
+                    } else {
+                        Ok(tmpState2)
+                    }
                 }
             }
         }
     }
 
+
+
     // Ends a block on the provider. This means that the current validator set is committed on chain,
-    // packets are queued, and the next block is started.
+    // packets are queued, and the next block is started. Also, consumers that have passed
+    // the VSCTimeout without responding to a pending vscpacket are dropped.
     pure def endAndBeginBlockForProvider(
         currentState: ProtocolState,
         // by how much the timestamp should be advanced,
@@ -313,29 +367,44 @@ module CCV {
         // a set of consumers that were unused before, but should be set to running now.
         consumersToStart: Set[Chain],
         // a set of consumers that were running before, but should be set to stopped now.
+        // This argument only needs to contain "voluntary" stops -
+        // forced stops, e.g. because a consumer timed out,
+        // will be added automatically. 
         consumersToStop: Set[Chain]): Result = {
         // commit the current running validator set on chain
         val currentProviderState = currentState.providerState
         val newChainState = currentProviderState.chainState.endAndBeginBlockShared(timeAdvancement)
+        val providerStateAfterTimeAdvancement = currentProviderState.with(
+            "chainState", newChainState
+        )
+
+        // check for VSC timeouts
+        val timedOutConsumers = getRunningConsumers(providerStateAfterTimeAdvancement).filter(
+            consumer => 
+            val res = TimeoutDueToVSCTimeout(currentState, consumer)
+            res._1
+        )
+
         // modify the states of the consumers that should be started/stopped
-        val res = currentProviderState.consumerStatus.getNewConsumerStatusMap(consumersToStart, consumersToStop)
+        val res = providerStateAfterTimeAdvancement.consumerStatus.getNewConsumerStatusMap(consumersToStart, consumersToStop.union(timedOutConsumers))
         val newConsumerStatus = res._1
         val err = res._2
         if (err != "") {
             Err(err)
         } else {
-            val newProviderState = currentProviderState.with(
-                "chainState", newChainState
-            ).with(
+            val providerStateAfterConsumerAdvancement = providerStateAfterTimeAdvancement.with(
                 "consumerStatus", newConsumerStatus
             )
             val providerStateAfterSending =
             if (currentProviderState.providerValidatorSetChangedInThisBlock and getRunningConsumers(currentState.providerState).size() > 0) {
-                    newProviderState.sendVscPackets()
+                    providerStateAfterConsumerAdvancement.sendVscPackets()
                 } else {
-                    newProviderState
+                    providerStateAfterConsumerAdvancement
                 }
-            Err("not implemented")
+            val newState = currentState.with(
+                "providerState", providerStateAfterSending
+            )
+            Ok(newState)
         }
     }
 
@@ -463,42 +532,44 @@ module CCV {
     // and only when the running validator set is considered to have changed
     // and there is a consumer to send a packet to.
     pure def sendVscPackets(providerState: ProviderState): ProviderState = {
+        val newSentPacketsPerConsumer = ConsumerChains.mapBy(
+            (consumer) => 
+            // if validator set changed and the consumer is running, send a packet
+            if (providerState.providerValidatorSetChangedInThisBlock and 
+                isCurrentlyConsumer(consumer, providerState)) {
+                List({
+                        id: providerState.runningVscId,
+                        validatorSet: providerState.chainState.currentValidatorSet,
+                          sendingTime: providerState.chainState.lastTimestamp
+                })
+            } else {
+                List()
+            }
+        )
         providerState.with(
             // send VSCPackets to consumers
-            "outstandingPacketsToConsumer", 
-            // if running validator set is considered to have changed and there is a consumer to send a packet to
-            if (providerState.providerValidatorSetChangedInThisBlock
-                and getRunningConsumers(providerState).size() > 0) {
-                    // then send a packet to each running consumer
-                    providerState.consumerStatus.keys().mapBy(
-                        // go through all potential consumers
-                        (consumer) => 
-                        val packetQueue = providerState.outstandingPacketsToConsumer.get(consumer)
-                        // if the consumer is running, send a packet
-                        if (isCurrentlyConsumer(consumer, providerState)) {
-                            packetQueue.append(
-                                {
-                                    id: providerState.runningVscId,
-                                    validatorSet: providerState.chainState.currentValidatorSet,
-                                    sendingTime: providerState.chainState.lastTimestamp
-                                }
-                            )
-                        } else {
-                            // otherwise, leave the queue as-is
-                            packetQueue
-                        }
+            "outstandingPacketsToConsumer",
+            ConsumerChains.mapBy(
+                (consumer) => 
+                providerState.outstandingPacketsToConsumer.get(consumer).concat(
+                    newSentPacketsPerConsumer.get(consumer)
+                )
+            )
+            ).with(
+                // update the sent VSCPackets
+                "sentVSCPackets",
+                ConsumerChains.mapBy(
+                    (consumer) => 
+                    providerState.sentVSCPackets.get(consumer).concat(
+                        newSentPacketsPerConsumer.get(consumer)
                     )
-                } else {
-                    // running validator set is not considered to have changed
-                    // ...so don't send any packets
-                    providerState.outstandingPacketsToConsumer
-                }
+                )
             ).with(
                 // the validator set has not changed yet in the new block
                 "providerValidatorSetChangedInThisBlock", false
             ).with(
                 "runningVscId", providerState.runningVscId + 1
-            ) 
+            )
     }
 
     // receives a given packet (sent by the provider) on the consumer. The arguments are the consumer chain that is receiving the packet, and the packet itself.
@@ -537,12 +608,17 @@ module CCV {
     pure def recvPacketOnProvider(currentState: ProtocolState, sender: Chain, packet: VSCMaturedPacket): Result = {
         if (not(isCurrentlyConsumer(sender, currentState.providerState))) {
             Err("Sender is not currently a consumer - must have 'running' status!")
+        } else if (currentState.providerState.sentVSCPackets.get(sender).head().id != packet.id) {
+            // the packet is not the oldest sentVSCPacket, something went wrong
+            Err("Received maturation is not for the oldest sentVSCPacket")
         } else {
             val currentReceivedMaturations = currentState.providerState.receivedMaturations
             val newReceivedMaturations = currentReceivedMaturations.add(packet)
             val newProviderState = currentState.providerState.with(
                 "receivedMaturations", newReceivedMaturations
             )
+            // prune the sentVSCPacket
+            val newSentVSCPacket = currentState.providerState.sentVSCPackets.get(sender).tail()
             val newState = currentState.with(
                 "providerState", newProviderState
             )
@@ -616,11 +692,11 @@ module CCV {
         )
     }
 
-    // Returns whether the consumer has timed out, and an error message.
+    // Returns whether the consumer has timed out due to the VSCTimeout, and an error message.
     // If the second return is not equal to "", the first return should be ignored.
     // If it is equal to "", the first return will be true if the consumer has timed out and should be dropped,
     // or false otherwise.
-    def consumerTimedOut(currentState: ProtocolState, consumer: Chain): (bool, str) =
+    pure def TimeoutDueToVSCTimeout(currentState: ProtocolState, consumer: Chain): (bool, str) =
         // check for errors: the consumer is not running
         if (not(isCurrentlyConsumer(consumer, currentState.providerState))) {
             (false, "Consumer is not currently a consumer - must have 'running' status!")
@@ -628,44 +704,16 @@ module CCV {
             val providerState = currentState.providerState
             val consumerState = currentState.consumerStates.get(consumer)
 
-            // has a packe from provider to consumer timed out?
-            val outstandingPacketsToConsumer = providerState.outstandingPacketsToConsumer.get(consumer)
-            val providerToConsumerPacketTimedOut = outstandingPacketsToConsumer.head().sendingTime +
-                CcvTimeoutPeriod.get(PROVIDER_CHAIN) <= consumerState.chainState.lastTimestamp
-
-            // has a packet from consumer to provider timed out?
-            val outstandingPacketsToProvider = consumerState.outstandingPacketsToProvider
-            val consumerToProviderPacketTimedOut = outstandingPacketsToProvider.head().sendingTime +
-                CcvTimeoutPeriod.get(consumer) <= providerState.chainState.lastTimestamp
-
-
-
-            (providerToConsumerPacketTimedOut, "")
+            // has a packet been sent on the provider more than VSCTimeout ago, but we have not received an answer since then?
+            val sentVSCPackets = providerState.sentVSCPackets.get(consumer)
+            val oldestSentVSCPacket = sentVSCPackets.head() // if length is 0, this is undefined, but we check for this before we use it
+            if(sentVSCPackets.length() > 0 and oldestSentVSCPacket.sendingTime + VscTimeout < providerState.chainState.lastTimestamp) {
+                (true, "")
+            } else {
+                // no timeout yet, it has not been VscTimeout since that packet was sent
+                (false, "")
+            }
         }
-        
-        // // either a package from provider to consumer has timed out
-        // currentState..get(consumer).select(
-        //     packet => packet.timeout <= curChainTimes.get(consumer)
-        // ).length() > 0,
-        // // or a package from consumer to provider has timed out
-        // outstandingPacketsToProvider.get(consumer).select(
-        //     packet => packet.timeout <= curChainTimes.get(ProviderChain)
-        // ).length() > 0,
-        // // or the inactivity timeout has passed since a VSCPacket was sent to the consumer, but the
-        // // provider has not received a VSCMaturedPacket for it
-        // val packetsWithoutResponse = sentVSCPackets.get(consumer).filter( // get packets without response
-        //     packet => 
-        //     not(receivedMaturations.exists(
-        //         maturedPacket => maturedPacket.id == packet.id
-        //     ))
-        // )
-        // // among those, get packets where inactivity timeout has passed
-        // packetsWithoutResponse.filter(
-        //     packet => 
-        //     val sentAt = curChainTimes.get(ProviderChain) - PacketTimeout // compute when the packet was sent
-        //     val timesOutAt = sentAt + InactivityTimeout // compute when the packet times out
-        //     timesOutAt <= curChainTimes.get(ProviderChain)
-        // ).size() > 0
 
     // ===================
     // ASSUMPTIONS ON MODEL PARAMETERS
@@ -681,11 +729,11 @@ module CCV {
 
     // the CCV timeout is positive
     run CcvTimeoutPositiveTest =
-        CcvTimeoutPeriod.keys().forall(chain => CcvTimeoutPeriod.get(chain) > 0)
+        CcvTimeout.keys().forall(chain => CcvTimeout.get(chain) > 0)
 
     // ccv timeout on the provider **must** be larger than unbonding period on each chain
     run CcvTimeoutLargerThanUnbondingPeriodTest =
-        CcvTimeoutPeriod.get(PROVIDER_CHAIN) > UnbondingPeriodPerChain.Values().Max()
+        CcvTimeout.get(PROVIDER_CHAIN) > UnbondingPeriodPerChain.Values().Max()
 
     // the provider chain is not a consumer chain
     run ProviderNotConsumerTest =
@@ -693,7 +741,7 @@ module CCV {
 
     // ccv timeout contains only consumers and provider, no other chains
     run CcvTimeoutSubsetTest =
-        CcvTimeoutPeriod.keys().forall(chain => ConsumerChains.contains(chain) or chain == PROVIDER_CHAIN)
+        CcvTimeout.keys().forall(chain => ConsumerChains.contains(chain) or chain == PROVIDER_CHAIN)
 
     // unbonding period contains consumers and provider, no other chains
     def UnbondingPeriodInv = UnbondingPeriodPerChain.keys() == ConsumerChains.add(PROVIDER_CHAIN)
@@ -711,23 +759,46 @@ module CCVStatemachinLogic {
 
     var currentState: ProtocolState
 
+    const InitialValidatorSet: ValidatorSet
+
     action init: bool = all {
         val providerState = GetEmptyProviderState
         val consumerStates = CCV::ConsumerChains.mapBy(chain => GetEmptyConsumerState)
+        val providerStateWithConsumers = providerState.with(
+            "consumerStatus", 
+            CCV::ConsumerChains.mapBy(chain => UNUSED)
+        ).with(
+            "outstandingPacketsToConsumer", 
+            CCV::ConsumerChains.mapBy(chain => List())
+        ).with(
+            "sentVSCPackets", 
+            CCV::ConsumerChains.mapBy(chain => List())
+        ).with(
+            // set the validator set to be the initial validator set in the history
+            "chainState", providerState.chainState.with(
+                "votingPowerHistory", List(InitialValidatorSet)
+            )
+        ).with(
+            // set the current validator set
+            "chainState", providerState.chainState.with(
+                "currentValidatorSet", InitialValidatorSet
+            )
+        )
         currentState' = {
             providerState: providerState,
             consumerStates: consumerStates
         }
     }
 
-    action votingPowerChanges(validator: Node, amount: int): bool = 
-        val result = CCV::votingPowerChange(currentState, validator, amount)
+    action VotingPowerChange(validator: Node, newVotingPower: int): bool = 
+        val result = CCV::votingPowerChange(currentState, validator, newVotingPower)
         all {
-        result.hasError == false,
-        currentState' = result.newState,
-    }
+            result.hasError == false,
+            currentState' = result.newState,
+        }
 
     // The receiver receives the next outstanding VSCPacket from the provider.
+    // This will time out the consumer if the packet timeout has passed on the receiver.
     action DeliverVSCPacket(receiver: Chain): bool = 
         val result = CCV::deliverPacketToConsumer(currentState, receiver)
         all {
@@ -735,6 +806,8 @@ module CCVStatemachinLogic {
             currentState' = result.newState,
         }
 
+    // The provider receives the next outstanding VSCMaturedPacket from the sender.
+    // This will time out the consumer if the packet timeout has passed on the provider.
     action DeliverVSCMaturedPacket(sender: Chain): bool =
         val result = CCV::deliverPacketToProvider(currentState, sender)
         all {
@@ -773,5 +846,36 @@ module CCVDefaultStateMachine {
     pure val unbondingPeriods = chains.mapBy(chain => 2 * Week)
     pure val ccvTimeouts = chains.mapBy(chain => 3 * Week)
 
-    import CCV(VscTimeout = 5 * Week, CcvTimeoutPeriod = unbondingPeriods, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = chains).*
+    pure val nodes = Set("node1", "node2", "node3", "node4", "node5", "node6", "node7", "node8", "node9", "node10")
+    pure val initialValidatorSet = nodes.mapBy(node => 100)
+
+    import CCV(VscTimeout = 5 * Week, CcvTimeout = unbondingPeriods, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = chains).*
+    import CCVStatemachinLogic(InitialValidatorSet = initialValidatorSet).*
+
+    run InitTest: bool = { 
+        init.then(
+            all {
+                assert(ConsumerChains == chains),
+                assert(currentState.providerState.consumerStatus == Map(
+                    "consumer1" -> UNUSED,
+                    "consumer2" -> UNUSED,
+                    "consumer3" -> UNUSED
+                )),
+                assert(currentState.providerState.outstandingPacketsToConsumer == Map(
+                    "consumer1" -> List(),
+                    "consumer2" -> List(),
+                    "consumer3" -> List()
+                )),
+                assert(currentState.providerState.sentVSCPackets == Map(
+                    "consumer1" -> List(),
+                    "consumer2" -> List(),
+                    "consumer3" -> List()
+                )),
+                assert(currentState.consumerStates.keys() == chains),
+                assert(currentState.providerState.chainState.votingPowerHistory == List(InitialValidatorSet)),
+                assert(currentState.providerState.chainState.currentValidatorSet == InitialValidatorSet),
+                assert(currentState.providerState.chainState.lastTimestamp == 0),
+                VotingPowerChange("node1", 50)
+            })
+    }
 }

From baaddb7b1671e0e772512c75be7a391bccd1de48 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Tue, 26 Sep 2023 18:18:58 +0200
Subject: [PATCH 22/80] Resolve issue by removing undefined field

---
 tests/difference/core/quint_model/ccv.qnt | 26 +++++++++++------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index e0f5753a79..84bbc9e7e0 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -754,25 +754,27 @@ module CCV {
 // i.e. regardless of how many chains there are, what the unbonding periods are, etc.
 module CCVStatemachinLogic {
     import Time.* from "./Time"
-    import CCV as CCV
+    import CCV.*
     import CCVTypes.*
 
+    import extraSpells.* from "./extraSpells"
+
     var currentState: ProtocolState
 
     const InitialValidatorSet: ValidatorSet
 
     action init: bool = all {
         val providerState = GetEmptyProviderState
-        val consumerStates = CCV::ConsumerChains.mapBy(chain => GetEmptyConsumerState)
+        val consumerStates = ConsumerChains.mapBy(chain => GetEmptyConsumerState)
         val providerStateWithConsumers = providerState.with(
             "consumerStatus", 
-            CCV::ConsumerChains.mapBy(chain => UNUSED)
+            ConsumerChains.mapBy(chain => UNUSED)
         ).with(
             "outstandingPacketsToConsumer", 
-            CCV::ConsumerChains.mapBy(chain => List())
+            ConsumerChains.mapBy(chain => List())
         ).with(
             "sentVSCPackets", 
-            CCV::ConsumerChains.mapBy(chain => List())
+            ConsumerChains.mapBy(chain => List())
         ).with(
             // set the validator set to be the initial validator set in the history
             "chainState", providerState.chainState.with(
@@ -791,7 +793,7 @@ module CCVStatemachinLogic {
     }
 
     action VotingPowerChange(validator: Node, newVotingPower: int): bool = 
-        val result = CCV::votingPowerChange(currentState, validator, newVotingPower)
+        val result = votingPowerChange(currentState, validator, newVotingPower)
         all {
             result.hasError == false,
             currentState' = result.newState,
@@ -800,7 +802,7 @@ module CCVStatemachinLogic {
     // The receiver receives the next outstanding VSCPacket from the provider.
     // This will time out the consumer if the packet timeout has passed on the receiver.
     action DeliverVSCPacket(receiver: Chain): bool = 
-        val result = CCV::deliverPacketToConsumer(currentState, receiver)
+        val result = deliverPacketToConsumer(currentState, receiver)
         all {
             result.hasError == false,
             currentState' = result.newState,
@@ -809,7 +811,7 @@ module CCVStatemachinLogic {
     // The provider receives the next outstanding VSCMaturedPacket from the sender.
     // This will time out the consumer if the packet timeout has passed on the provider.
     action DeliverVSCMaturedPacket(sender: Chain): bool =
-        val result = CCV::deliverPacketToProvider(currentState, sender)
+        val result = deliverPacketToProvider(currentState, sender)
         all {
             result.hasError == false,
             currentState' = result.newState,
@@ -819,7 +821,7 @@ module CCVStatemachinLogic {
         timeAdvancement: Time,
         consumersToStart: Set[Chain],
         consumersToStop: Set[Chain]): bool = 
-        val result = CCV::endAndBeginBlockForProvider(currentState, timeAdvancement, consumersToStart, consumersToStop)
+        val result = endAndBeginBlockForProvider(currentState, timeAdvancement, consumersToStart, consumersToStop)
         all {
             result.hasError == false,
             currentState' = result.newState,
@@ -828,7 +830,7 @@ module CCVStatemachinLogic {
     action EndAndBeginBlockForConsumer(
         chain: Chain,
         timeAdvancement: Time): bool = 
-        val result = CCV::endAndBeginBlockForConsumer(currentState, chain, timeAdvancement)
+        val result = endAndBeginBlockForConsumer(currentState, chain, timeAdvancement)
         all {
             result.hasError == false,
             currentState' = result.newState,
@@ -849,13 +851,11 @@ module CCVDefaultStateMachine {
     pure val nodes = Set("node1", "node2", "node3", "node4", "node5", "node6", "node7", "node8", "node9", "node10")
     pure val initialValidatorSet = nodes.mapBy(node => 100)
 
-    import CCV(VscTimeout = 5 * Week, CcvTimeout = unbondingPeriods, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = chains).*
-    import CCVStatemachinLogic(InitialValidatorSet = initialValidatorSet).*
+    import CCVStatemachinLogic(InitialValidatorSet = initialValidatorSet, VscTimeout = 5 * Week, CcvTimeout = unbondingPeriods, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = chains).*
 
     run InitTest: bool = { 
         init.then(
             all {
-                assert(ConsumerChains == chains),
                 assert(currentState.providerState.consumerStatus == Map(
                     "consumer1" -> UNUSED,
                     "consumer2" -> UNUSED,

From 2c1341d6453b9326c9f8dcdd6ee18c07c50dac83 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Wed, 27 Sep 2023 09:08:12 +0200
Subject: [PATCH 23/80] Remove add

---
 tests/difference/core/quint_model/ccv.qnt | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 84bbc9e7e0..fc180a2b35 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -613,7 +613,7 @@ module CCV {
             Err("Received maturation is not for the oldest sentVSCPacket")
         } else {
             val currentReceivedMaturations = currentState.providerState.receivedMaturations
-            val newReceivedMaturations = currentReceivedMaturations.add(packet)
+            val newReceivedMaturations = currentReceivedMaturations.union(Set(packet))
             val newProviderState = currentState.providerState.with(
                 "receivedMaturations", newReceivedMaturations
             )
@@ -742,10 +742,6 @@ module CCV {
     // ccv timeout contains only consumers and provider, no other chains
     run CcvTimeoutSubsetTest =
         CcvTimeout.keys().forall(chain => ConsumerChains.contains(chain) or chain == PROVIDER_CHAIN)
-
-    // unbonding period contains consumers and provider, no other chains
-    def UnbondingPeriodInv = UnbondingPeriodPerChain.keys() == ConsumerChains.add(PROVIDER_CHAIN)
-
     
 }
 
@@ -844,7 +840,7 @@ module CCVDefaultStateMachine {
     import extraSpells.* from "./extraSpells"
 
     pure val consumerChains = Set("consumer1", "consumer2", "consumer3")
-    pure val chains = consumerChains.add(PROVIDER_CHAIN)
+    pure val chains = consumerChains.union(Set(PROVIDER_CHAIN))
     pure val unbondingPeriods = chains.mapBy(chain => 2 * Week)
     pure val ccvTimeouts = chains.mapBy(chain => 3 * Week)
 

From e09968d94a4e5a84bf144e5f0737e1f529494772 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Wed, 27 Sep 2023 14:35:55 +0200
Subject: [PATCH 24/80] Fix init

---
 tests/difference/core/quint_model/ccv.qnt | 29 ++++++++++-------------
 1 file changed, 12 insertions(+), 17 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index fc180a2b35..32f3ac5a88 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -719,30 +719,28 @@ module CCV {
     // ASSUMPTIONS ON MODEL PARAMETERS
     // ===================
 
-    // the unbonding period is positive
     run UnbondingPeriodPositiveTest =
         UnbondingPeriodPerChain.keys().forall(chain => UnbondingPeriodPerChain.get(chain) > 0)
 
-    // the VSC timeout is positive
     run VscTimeoutPositiveTest =
         VscTimeout > 0
 
-    // the CCV timeout is positive
     run CcvTimeoutPositiveTest =
         CcvTimeout.keys().forall(chain => CcvTimeout.get(chain) > 0)
 
-    // ccv timeout on the provider **must** be larger than unbonding period on each chain
     run CcvTimeoutLargerThanUnbondingPeriodTest =
         CcvTimeout.get(PROVIDER_CHAIN) > UnbondingPeriodPerChain.Values().Max()
 
-    // the provider chain is not a consumer chain
-    run ProviderNotConsumerTest =
+    run ProviderIsNotAConsumerTest =
         not(ConsumerChains.contains(PROVIDER_CHAIN))
 
-    // ccv timeout contains only consumers and provider, no other chains
-    run CcvTimeoutSubsetTest =
-        CcvTimeout.keys().forall(chain => ConsumerChains.contains(chain) or chain == PROVIDER_CHAIN)
-    
+    // ccv timeout contains exactly consumers and provider, no other chains
+    run CcvTimeoutKeysTest =
+        CcvTimeout.keys() == ConsumerChains.union(Set(PROVIDER_CHAIN))
+
+    // unbonding period contains exactly consumers and provider, no other chains
+    run UnbondingPeriodKeysTest =
+        UnbondingPeriodPerChain.keys() == ConsumerChains.union(Set(PROVIDER_CHAIN))
 }
 
 // A basic state machine that utilizes the CCV protocol.
@@ -775,15 +773,12 @@ module CCVStatemachinLogic {
             // set the validator set to be the initial validator set in the history
             "chainState", providerState.chainState.with(
                 "votingPowerHistory", List(InitialValidatorSet)
-            )
-        ).with(
-            // set the current validator set
-            "chainState", providerState.chainState.with(
+            ).with(
                 "currentValidatorSet", InitialValidatorSet
             )
         )
         currentState' = {
-            providerState: providerState,
+            providerState: providerStateWithConsumers,
             consumerStates: consumerStates
         }
     }
@@ -847,7 +842,7 @@ module CCVDefaultStateMachine {
     pure val nodes = Set("node1", "node2", "node3", "node4", "node5", "node6", "node7", "node8", "node9", "node10")
     pure val initialValidatorSet = nodes.mapBy(node => 100)
 
-    import CCVStatemachinLogic(InitialValidatorSet = initialValidatorSet, VscTimeout = 5 * Week, CcvTimeout = unbondingPeriods, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = chains).*
+    import CCVStatemachinLogic(InitialValidatorSet = initialValidatorSet, VscTimeout = 5 * Week, CcvTimeout = unbondingPeriods, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = consumerChains).*
 
     run InitTest: bool = { 
         init.then(
@@ -867,7 +862,7 @@ module CCVDefaultStateMachine {
                     "consumer2" -> List(),
                     "consumer3" -> List()
                 )),
-                assert(currentState.consumerStates.keys() == chains),
+                assert(currentState.consumerStates.keys() == consumerChains),
                 assert(currentState.providerState.chainState.votingPowerHistory == List(InitialValidatorSet)),
                 assert(currentState.providerState.chainState.currentValidatorSet == InitialValidatorSet),
                 assert(currentState.providerState.chainState.lastTimestamp == 0),

From 55ab5955d71c4e5ea783cdd1a9a2a9de84cad797 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Thu, 28 Sep 2023 08:50:07 +0200
Subject: [PATCH 25/80] Snapshot spec with parser crasher

---
 tests/difference/core/quint_model/ccv.qnt | 243 +++++++++++++++++-----
 1 file changed, 192 insertions(+), 51 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 32f3ac5a88..f6b8eb19cc 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -130,6 +130,13 @@ module CCVTypes {
         consumerStates: Chain -> ConsumerState
     }
 
+    // gets a protocol state that is initialized minimally.
+    pure def GetEmptyProtocolState(): ProtocolState = 
+        {
+            providerState: GetEmptyProviderState,
+            consumerStates: Map(),
+        }
+
     type Error = {
         message: str
     }
@@ -298,7 +305,31 @@ module CCV {
                 }
             }
         }
-    }
+    }   
+
+    // Defines a test state to test the deliverPacketToProvider function against.
+    pure val _DeliverPacketToProvider_TestState =
+        val currentState = GetEmptyProtocolState
+        val sender = "sender"
+        val providerState = currentState.providerState
+        val consumerState = GetEmptyConsumerState
+        // add the consumer to the consumerStates
+        val consumerStates = currentState.consumerStates.set(sender, consumerState)
+        val providerState2 = providerState.with(
+            "consumerStatus", providerState.consumerStatus.set(sender, RUNNING)
+        )
+        val providerState3 = providerState2.with(
+            "outstandingPacketsToConsumer", providerState2.outstandingPacketsToConsumer.set(sender, List({
+                id: 0,
+                validatorSet: Map(),
+                sendingTime: 0
+            }))
+        )
+        currentState.with(
+            "providerState", providerState3
+        ).with(
+            "consumerStates", consumerStates
+        )
 
     // Delivers the next queued VSCPacket from the provider chain to a consumer chain.
     // Only argument is the consumer chain, to which the packet will be delivered.
@@ -504,6 +535,7 @@ module CCV {
             }
         }
 
+
     // Takes the currentValidatorSet and puts it as the newest set of the voting history
     pure def enterCurValSetIntoBlock(chainState: ChainState): ChainState = {
         chainState.with(
@@ -714,49 +746,28 @@ module CCV {
                 (false, "")
             }
         }
+}
 
-    // ===================
-    // ASSUMPTIONS ON MODEL PARAMETERS
-    // ===================
-
-    run UnbondingPeriodPositiveTest =
-        UnbondingPeriodPerChain.keys().forall(chain => UnbondingPeriodPerChain.get(chain) > 0)
-
-    run VscTimeoutPositiveTest =
-        VscTimeout > 0
-
-    run CcvTimeoutPositiveTest =
-        CcvTimeout.keys().forall(chain => CcvTimeout.get(chain) > 0)
-
-    run CcvTimeoutLargerThanUnbondingPeriodTest =
-        CcvTimeout.get(PROVIDER_CHAIN) > UnbondingPeriodPerChain.Values().Max()
 
-    run ProviderIsNotAConsumerTest =
-        not(ConsumerChains.contains(PROVIDER_CHAIN))
+module CCVDefaultStateMachine {
+    // A basic state machine that utilizes the CCV protocol.
+    import Time.* from "./Time"
+    import CCVTypes.*
+    import extraSpells.* from "./extraSpells"
 
-    // ccv timeout contains exactly consumers and provider, no other chains
-    run CcvTimeoutKeysTest =
-        CcvTimeout.keys() == ConsumerChains.union(Set(PROVIDER_CHAIN))
+    pure val consumerChains = Set("consumer1", "consumer2", "consumer3")
+    pure val chains = consumerChains.union(Set(PROVIDER_CHAIN))
+    pure val unbondingPeriods = chains.mapBy(chain => 2 * Week)
+    pure val ccvTimeouts = chains.mapBy(chain => 3 * Week)
 
-    // unbonding period contains exactly consumers and provider, no other chains
-    run UnbondingPeriodKeysTest =
-        UnbondingPeriodPerChain.keys() == ConsumerChains.union(Set(PROVIDER_CHAIN))
-}
+    pure val nodes = Set("node1", "node2", "node3", "node4", "node5", "node6", "node7", "node8", "node9", "node10")
+    pure val InitialValidatorSet = nodes.mapBy(node => 100)
 
-// A basic state machine that utilizes the CCV protocol.
-// Still leaves constants unassigned, just defines the state machine logic in general,
-// i.e. regardless of how many chains there are, what the unbonding periods are, etc.
-module CCVStatemachinLogic {
-    import Time.* from "./Time"
-    import CCV.*
-    import CCVTypes.*
+    import CCV(VscTimeout = 5 * Week, CcvTimeout = ccvTimeouts, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = consumerChains).*
 
-    import extraSpells.* from "./extraSpells"
 
     var currentState: ProtocolState
 
-    const InitialValidatorSet: ValidatorSet
-
     action init: bool = all {
         val providerState = GetEmptyProviderState
         val consumerStates = ConsumerChains.mapBy(chain => GetEmptyConsumerState)
@@ -826,23 +837,141 @@ module CCVStatemachinLogic {
             result.hasError == false,
             currentState' = result.newState,
         }
-}
 
-module CCVDefaultStateMachine {
-    // A basic state machine that utilizes the CCV protocol.
-    import Time.* from "./Time"
-    import CCVTypes.*
-    import extraSpells.* from "./extraSpells"
+    // negative voting powers give an error
+    run VotingPowerNegativeTest =
+        votingPowerChange(
+            GetEmptyProtocolState,
+            "validator",
+            -1
+        ).hasError
+
+    run VotingPowerOkTest =
+        val result = votingPowerChange(
+            GetEmptyProtocolState,
+            "validator",
+            0
+        )
+        not(result.hasError) and
+        result.newState.providerState.chainState.currentValidatorSet.keys().contains("validator") and
+        result.newState.providerState.chainState.currentValidatorSet.get("validator") == 0
+
+    // make sure that VotingPowerChange ONLY changes the current validator set, not the history
+    run VotingPowerChangeDoesNotChangeHistoryTest =
+        val result = votingPowerChange(
+            GetEmptyProtocolState,
+            "validator",
+            0
+        )
+        not(result.hasError) and
+        result.newState.providerState.chainState.votingPowerHistory == List()
+
+    run DeliverPacketToProviderHappyPathTest =
+        val result = deliverPacketToProvider(_DeliverPacketToProvider_TestState, "sender")
+        val newProviderState = result.newState.providerState
+        val newConsumerState = result.newState.consumerStates.get("sender")
+        not(result.hasError) and
+        newProviderState.receivedMaturations.size() == 1 and
+        newConsumerState.outstandingPacketsToProvider.length() == 0
+
+    run DeliverPacketToProviderTimeoutTest =
+        // set the timestamp to be after the timeout
+        val testState = _DeliverPacketToProvider_TestState.with(
+            "providerState", _DeliverPacketToProvider_TestState.providerState.with(
+                "chainState", _DeliverPacketToProvider_TestState.providerState.chainState.with(
+                    "lastTimestamp", CcvTimeout.get("sender") + 1
+                )
+            )
+        )
+        val result = deliverPacketToProvider(testState, "sender")
+        val newProviderState = result.newState.providerState
+        val newConsumerState = result.newState.consumerStates.get("sender")
+        not(result.hasError) and
+        newProviderState.receivedMaturations.size() == 0 and
+        newConsumerState.outstandingPacketsToProvider.length() == 0 and
+        newProviderState.consumerStatus.get("sender") == STOPPED
+
+    run ConsumerStatusMapHappyPathTest = 
+        val currentConsumerStatusMap = Map(
+            "chain1" -> UNUSED,
+            "chain2" -> RUNNING,
+            "chain3" -> STOPPED
+        )
+        val res = getNewConsumerStatusMap(
+            currentConsumerStatusMap,
+            Set("chain1"),
+            Set("chain3")
+        )
+        res._2 == "" and
+        res._1.get("chain1") == RUNNING and
+        res._1.get("chain2") == RUNNING and
+        res._1.get("chain3") == UNUSED
+
+    run ConsumerStatusMapAlreadyRunningTest =
+        val currentConsumerStatusMap = Map(
+            "chain1" -> UNUSED,
+            "chain2" -> RUNNING,
+            "chain3" -> STOPPED
+        )
+        val res = getNewConsumerStatusMap(
+            currentConsumerStatusMap,
+            Set("chain2"),
+            Set("chain3")
+        )
+        res._2 == "Cannot start a consumer that is already running"
 
-    pure val consumerChains = Set("consumer1", "consumer2", "consumer3")
-    pure val chains = consumerChains.union(Set(PROVIDER_CHAIN))
-    pure val unbondingPeriods = chains.mapBy(chain => 2 * Week)
-    pure val ccvTimeouts = chains.mapBy(chain => 3 * Week)
+    run ConsumerStatusMapAlreadyStoppedTest =
+        val currentConsumerStatusMap = Map(
+            "chain1" -> UNUSED,
+            "chain2" -> RUNNING,
+            "chain3" -> STOPPED
+        )
+        val res = getNewConsumerStatusMap(
+            currentConsumerStatusMap,
+            Set("chain1"),
+            Set("chain3")
+        )
+        res._2 == "Cannot stop a consumer that is not running"
 
-    pure val nodes = Set("node1", "node2", "node3", "node4", "node5", "node6", "node7", "node8", "node9", "node10")
-    pure val initialValidatorSet = nodes.mapBy(node => 100)
+    run ChainBothInStartAndStopTest =
+        val currentConsumerStatusMap = Map(
+            "chain1" -> UNUSED,
+            "chain2" -> RUNNING,
+            "chain3" -> STOPPED
+        )
+        val res = getNewConsumerStatusMap(
+            currentConsumerStatusMap,
+            Set("chain1"),
+            Set("chain1")
+        )
+        res._2 == "Cannot start and stop a consumer at the same time"
 
-    import CCVStatemachinLogic(InitialValidatorSet = initialValidatorSet, VscTimeout = 5 * Week, CcvTimeout = unbondingPeriods, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = consumerChains).*
+    // ===================
+    // ASSUMPTIONS ON MODEL PARAMETERS
+    // ===================
+
+    run UnbondingPeriodPositiveTest =
+        UnbondingPeriodPerChain.keys().forall(chain => UnbondingPeriodPerChain.get(chain) > 0)
+
+    run VscTimeoutPositiveTest =
+        VscTimeout > 0
+
+    run CcvTimeoutPositiveTest =
+        CcvTimeout.keys().forall(chain => CcvTimeout.get(chain) > 0)
+
+    run CcvTimeoutLargerThanUnbondingPeriodTest =
+        CcvTimeout.get(PROVIDER_CHAIN) > UnbondingPeriodPerChain.Values().Max()
+
+    run ProviderIsNotAConsumerTest =
+        not(ConsumerChains.contains(PROVIDER_CHAIN))
+
+    // ccv timeout contains exactly consumers and provider, no other chains
+    run CcvTimeoutKeysTest =
+        CcvTimeout.keys() == ConsumerChains.union(Set(PROVIDER_CHAIN))
+
+    // unbonding period contains exactly consumers and provider, no other chains
+    run UnbondingPeriodKeysTest =
+        UnbondingPeriodPerChain.keys() == ConsumerChains.union(Set(PROVIDER_CHAIN))
 
     run InitTest: bool = { 
         init.then(
@@ -866,7 +995,19 @@ module CCVDefaultStateMachine {
                 assert(currentState.providerState.chainState.votingPowerHistory == List(InitialValidatorSet)),
                 assert(currentState.providerState.chainState.currentValidatorSet == InitialValidatorSet),
                 assert(currentState.providerState.chainState.lastTimestamp == 0),
-                VotingPowerChange("node1", 50)
-            })
-    }
+                val firstState = currentState // snapshot the first state
+                VotingPowerChange("node1", 50).then(all {
+                            // ensure that the only change is that the voting power of node1 is changed
+                            assert(currentState == firstState.with(
+                                "providerState", firstState.providerState.with(
+                                    "chainState", firstState.providerState.chainState.with(
+                                        "currentValidatorSet", firstState.providerState.chainState.currentValidatorSet.put("node1", 50)
+                                    )
+                                )
+                            )),
+                            currentState' = currentState
+                        })
+                    }
+            )
+        }
 }

From 0897e8ccc3834dfa580bd7b3089d8a5051ab778d Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Thu, 28 Sep 2023 09:54:22 +0200
Subject: [PATCH 26/80] Snapshot model

---
 tests/difference/core/quint_model/ccv.qnt | 211 ++++++++++++++--------
 1 file changed, 137 insertions(+), 74 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index f6b8eb19cc..149474e5e6 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -314,12 +314,12 @@ module CCV {
         val providerState = currentState.providerState
         val consumerState = GetEmptyConsumerState
         // add the consumer to the consumerStates
-        val consumerStates = currentState.consumerStates.set(sender, consumerState)
+        val consumerStates = currentState.consumerStates.put(sender, consumerState)
         val providerState2 = providerState.with(
-            "consumerStatus", providerState.consumerStatus.set(sender, RUNNING)
+            "consumerStatus", providerState.consumerStatus.put(sender, RUNNING)
         )
         val providerState3 = providerState2.with(
-            "outstandingPacketsToConsumer", providerState2.outstandingPacketsToConsumer.set(sender, List({
+            "outstandingPacketsToConsumer", providerState2.outstandingPacketsToConsumer.put(sender, List({
                 id: 0,
                 validatorSet: Map(),
                 sendingTime: 0
@@ -746,6 +746,33 @@ module CCV {
                 (false, "")
             }
         }
+
+    // ===================
+    // ASSUMPTIONS ON MODEL PARAMETERS
+    // ===================
+
+    run UnbondingPeriodPositiveTest =
+        UnbondingPeriodPerChain.keys().forall(chain => UnbondingPeriodPerChain.get(chain) > 0)
+
+    run VscTimeoutPositiveTest =
+        VscTimeout > 0
+
+    run CcvTimeoutPositiveTest =
+        CcvTimeout.keys().forall(chain => CcvTimeout.get(chain) > 0)
+
+    run CcvTimeoutLargerThanUnbondingPeriodTest =
+        CcvTimeout.get(PROVIDER_CHAIN) > UnbondingPeriodPerChain.Values().Max()
+
+    run ProviderIsNotAConsumerTest =
+        not(ConsumerChains.contains(PROVIDER_CHAIN))
+
+    // ccv timeout contains exactly consumers and provider, no other chains
+    run CcvTimeoutKeysTest =
+        CcvTimeout.keys() == ConsumerChains.union(Set(PROVIDER_CHAIN))
+
+    // unbonding period contains exactly consumers and provider, no other chains
+    run UnbondingPeriodKeysTest =
+        UnbondingPeriodPerChain.keys() == ConsumerChains.union(Set(PROVIDER_CHAIN))
 }
 
 
@@ -838,26 +865,102 @@ module CCVDefaultStateMachine {
             currentState' = result.newState,
         }
 
+    run InitTest: bool = { 
+        init.then(
+            all {
+                assert(currentState.providerState.consumerStatus == Map(
+                    "consumer1" -> UNUSED,
+                    "consumer2" -> UNUSED,
+                    "consumer3" -> UNUSED
+                )),
+                assert(currentState.providerState.outstandingPacketsToConsumer == Map(
+                    "consumer1" -> List(),
+                    "consumer2" -> List(),
+                    "consumer3" -> List()
+                )),
+                assert(currentState.providerState.sentVSCPackets == Map(
+                    "consumer1" -> List(),
+                    "consumer2" -> List(),
+                    "consumer3" -> List()
+                )),
+                assert(currentState.consumerStates.keys() == consumerChains),
+                assert(currentState.providerState.chainState.votingPowerHistory == List(InitialValidatorSet)),
+                assert(currentState.providerState.chainState.currentValidatorSet == InitialValidatorSet),
+                assert(currentState.providerState.chainState.lastTimestamp == 0),
+                val firstState = currentState // snapshot the first state
+                VotingPowerChange("node1", 50).then(all {
+                            // ensure that the only change is that the voting power of node1 is changed
+                            assert(currentState == firstState.with(
+                                "providerState", firstState.providerState.with(
+                                    "chainState", firstState.providerState.chainState.with(
+                                        "currentValidatorSet", firstState.providerState.chainState.currentValidatorSet.put("node1", 50)
+                                    )
+                                )
+                            )),
+                            currentState' = currentState
+                        })
+                    }
+            )
+        }
+
+}
+
+// contains test logic for the stateless functions in the CCV module
+module CCVLogicTest {
+    import CCVTypes.*
+    import Time.* from "./Time"
+    import extraSpells.* from "./extraSpells"
+
+    pure val consumerChains = Set("sender", "receiver")
+    pure val chains = consumerChains.union(Set(PROVIDER_CHAIN))
+    pure val unbondingPeriods = chains.mapBy(chain => 2 * Week)
+    pure val ccvTimeouts = chains.mapBy(chain => 3 * Week)
+
+    import CCV(VscTimeout = 5 * Week, CcvTimeout = ccvTimeouts, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = consumerChains).*
+
     // negative voting powers give an error
     run VotingPowerNegativeTest =
+    {
         votingPowerChange(
             GetEmptyProtocolState,
             "validator",
             -1
         ).hasError
+    }
 
     run VotingPowerOkTest =
+    {
         val result = votingPowerChange(
             GetEmptyProtocolState,
             "validator",
-            0
+            5
         )
         not(result.hasError) and
         result.newState.providerState.chainState.currentValidatorSet.keys().contains("validator") and
-        result.newState.providerState.chainState.currentValidatorSet.get("validator") == 0
+        result.newState.providerState.chainState.currentValidatorSet.get("validator") == 5
+    }
+
+    // validators that get zero voting power are removed
+    run VotingPowerZeroTest =
+    {
+        val tmpResult = votingPowerChange(
+            GetEmptyProtocolState,
+            "validator",
+            5
+        )
+        val finalResult = votingPowerChange(
+            tmpResult.newState,
+            "validator",
+            0
+        )
+        not(finalResult.hasError) and
+        not(finalResult.newState.providerState.chainState.currentValidatorSet.keys().contains("validator"))
+    }
+
 
     // make sure that VotingPowerChange ONLY changes the current validator set, not the history
     run VotingPowerChangeDoesNotChangeHistoryTest =
+    {
         val result = votingPowerChange(
             GetEmptyProtocolState,
             "validator",
@@ -865,16 +968,32 @@ module CCVDefaultStateMachine {
         )
         not(result.hasError) and
         result.newState.providerState.chainState.votingPowerHistory == List()
+    }
 
     run DeliverPacketToProviderHappyPathTest =
-        val result = deliverPacketToProvider(_DeliverPacketToProvider_TestState, "sender")
+    {
+        // add a packet on the consumer
+        val testState = _DeliverPacketToProvider_TestState.with(
+            "consumerStates", _DeliverPacketToProvider_TestState.consumerStates.put(
+                "sender", _DeliverPacketToProvider_TestState.consumerStates.get("sender").with(
+                    "outstandingPacketsToProvider", List({
+                        id: 0,
+                        sendingTime: 0
+                    })
+                )
+            )
+        )
+
+        val result = deliverPacketToProvider(testState, "sender")
         val newProviderState = result.newState.providerState
         val newConsumerState = result.newState.consumerStates.get("sender")
         not(result.hasError) and
         newProviderState.receivedMaturations.size() == 1 and
         newConsumerState.outstandingPacketsToProvider.length() == 0
+    }
 
     run DeliverPacketToProviderTimeoutTest =
+    {
         // set the timestamp to be after the timeout
         val testState = _DeliverPacketToProvider_TestState.with(
             "providerState", _DeliverPacketToProvider_TestState.providerState.with(
@@ -890,8 +1009,10 @@ module CCVDefaultStateMachine {
         newProviderState.receivedMaturations.size() == 0 and
         newConsumerState.outstandingPacketsToProvider.length() == 0 and
         newProviderState.consumerStatus.get("sender") == STOPPED
+    }
 
     run ConsumerStatusMapHappyPathTest = 
+    {
         val currentConsumerStatusMap = Map(
             "chain1" -> UNUSED,
             "chain2" -> RUNNING,
@@ -900,14 +1021,16 @@ module CCVDefaultStateMachine {
         val res = getNewConsumerStatusMap(
             currentConsumerStatusMap,
             Set("chain1"),
-            Set("chain3")
+            Set("chain2")
         )
         res._2 == "" and
         res._1.get("chain1") == RUNNING and
-        res._1.get("chain2") == RUNNING and
-        res._1.get("chain3") == UNUSED
+        res._1.get("chain2") == STOPPED and
+        res._1.get("chain3") == STOPPED
+    }
 
     run ConsumerStatusMapAlreadyRunningTest =
+    {
         val currentConsumerStatusMap = Map(
             "chain1" -> UNUSED,
             "chain2" -> RUNNING,
@@ -919,8 +1042,10 @@ module CCVDefaultStateMachine {
             Set("chain3")
         )
         res._2 == "Cannot start a consumer that is already running"
+    }
 
     run ConsumerStatusMapAlreadyStoppedTest =
+    {
         val currentConsumerStatusMap = Map(
             "chain1" -> UNUSED,
             "chain2" -> RUNNING,
@@ -932,8 +1057,10 @@ module CCVDefaultStateMachine {
             Set("chain3")
         )
         res._2 == "Cannot stop a consumer that is not running"
+    }
 
     run ChainBothInStartAndStopTest =
+    {
         val currentConsumerStatusMap = Map(
             "chain1" -> UNUSED,
             "chain2" -> RUNNING,
@@ -945,69 +1072,5 @@ module CCVDefaultStateMachine {
             Set("chain1")
         )
         res._2 == "Cannot start and stop a consumer at the same time"
-
-    // ===================
-    // ASSUMPTIONS ON MODEL PARAMETERS
-    // ===================
-
-    run UnbondingPeriodPositiveTest =
-        UnbondingPeriodPerChain.keys().forall(chain => UnbondingPeriodPerChain.get(chain) > 0)
-
-    run VscTimeoutPositiveTest =
-        VscTimeout > 0
-
-    run CcvTimeoutPositiveTest =
-        CcvTimeout.keys().forall(chain => CcvTimeout.get(chain) > 0)
-
-    run CcvTimeoutLargerThanUnbondingPeriodTest =
-        CcvTimeout.get(PROVIDER_CHAIN) > UnbondingPeriodPerChain.Values().Max()
-
-    run ProviderIsNotAConsumerTest =
-        not(ConsumerChains.contains(PROVIDER_CHAIN))
-
-    // ccv timeout contains exactly consumers and provider, no other chains
-    run CcvTimeoutKeysTest =
-        CcvTimeout.keys() == ConsumerChains.union(Set(PROVIDER_CHAIN))
-
-    // unbonding period contains exactly consumers and provider, no other chains
-    run UnbondingPeriodKeysTest =
-        UnbondingPeriodPerChain.keys() == ConsumerChains.union(Set(PROVIDER_CHAIN))
-
-    run InitTest: bool = { 
-        init.then(
-            all {
-                assert(currentState.providerState.consumerStatus == Map(
-                    "consumer1" -> UNUSED,
-                    "consumer2" -> UNUSED,
-                    "consumer3" -> UNUSED
-                )),
-                assert(currentState.providerState.outstandingPacketsToConsumer == Map(
-                    "consumer1" -> List(),
-                    "consumer2" -> List(),
-                    "consumer3" -> List()
-                )),
-                assert(currentState.providerState.sentVSCPackets == Map(
-                    "consumer1" -> List(),
-                    "consumer2" -> List(),
-                    "consumer3" -> List()
-                )),
-                assert(currentState.consumerStates.keys() == consumerChains),
-                assert(currentState.providerState.chainState.votingPowerHistory == List(InitialValidatorSet)),
-                assert(currentState.providerState.chainState.currentValidatorSet == InitialValidatorSet),
-                assert(currentState.providerState.chainState.lastTimestamp == 0),
-                val firstState = currentState // snapshot the first state
-                VotingPowerChange("node1", 50).then(all {
-                            // ensure that the only change is that the voting power of node1 is changed
-                            assert(currentState == firstState.with(
-                                "providerState", firstState.providerState.with(
-                                    "chainState", firstState.providerState.chainState.with(
-                                        "currentValidatorSet", firstState.providerState.chainState.currentValidatorSet.put("node1", 50)
-                                    )
-                                )
-                            )),
-                            currentState' = currentState
-                        })
-                    }
-            )
-        }
+    }
 }

From d227aeec0d6ebd2727ef47a4a5796f929033737e Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Thu, 28 Sep 2023 14:39:52 +0200
Subject: [PATCH 27/80] Start debugging tests

---
 tests/difference/core/quint_model/ccv.qnt | 125 +++++++++++++++-------
 1 file changed, 85 insertions(+), 40 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 149474e5e6..0956e4e9bc 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -257,16 +257,19 @@ module CCV {
     // Only argument is the consumer chain, from which the packet will be delivered.
     // If this packet will time out on the provider on delivery,
     // the consumer will be dropped.
-    pure def deliverPacketToProvider(currentState: ProtocolState, sender: Chain): Result = {
+    // The first return is the result of the operation, the second result is a boolean
+    // that indicates whether the consumer timed out or not.
+    // If the result has an error, the second return should be ignored.
+    pure def deliverPacketToProvider(currentState: ProtocolState, sender: Chain): (Result, bool) = {
         if (not(isCurrentlyConsumer(sender, currentState.providerState))) {
-            Err("Sender is not currently a consumer - must have 'running' status!")
+            (Err("Sender is not currently a consumer - must have 'running' status!"), false)
         } else if (length(currentState.consumerStates.get(sender).outstandingPacketsToProvider) == 0) {
-            Err("No outstanding packets to deliver")
+            (Err("No outstanding packets to deliver"), false)
         } else {
             val packet = currentState.consumerStates.get(sender).outstandingPacketsToProvider.head()
             // if the packet has timed out, drop the consumer. its state doesn't matter anymore
             val timeout = CcvTimeout.get(sender)
-            if(packet.sendingTime + CcvTimeout.get(sender) > currentState.providerState.chainState.lastTimestamp) {
+            if(packet.sendingTime + CcvTimeout.get(sender) < currentState.providerState.chainState.lastTimestamp) {
                 // drop consumer
                 val result = getNewConsumerStatusMap(
                     currentState.providerState.consumerStatus,
@@ -277,7 +280,7 @@ module CCV {
                 val newConsumerStatus = result._1
                 val err = result._2
                 if (err != "") {
-                    Err(err)
+                    (Err(err), false)
                 } else {
                     val newProviderState = currentState.providerState.with(
                         "consumerStatus", newConsumerStatus
@@ -285,22 +288,22 @@ module CCV {
                     val newState = currentState.with(
                         "providerState", newProviderState
                     )
-                    Ok(newState)
+                    (Ok(newState), true) // true because the packet timed out
                 }
             } else {
                 // the packet has not timed out, so receive it on the provider
                 val result = recvPacketOnProvider(currentState, sender, packet)
                 val tmpState = result.newState
                 if (result.hasError) {
-                    Err(result.error.message)
+                    (Err(result.error.message), false)
                 } else {
                     val result2 = removeOutstandingPacketFromConsumer(tmpState, sender)
                     val tmpState2 = result2.newState
                     val err2 = result2.error
                     if (result2.hasError) {
-                        Err(err2.message)
+                        (Err(err2.message), false)
                     } else {
-                        Ok(tmpState2)
+                        (Ok(tmpState2), false) // false because the packet did not time out
                     }
                 }
             }
@@ -335,15 +338,18 @@ module CCV {
     // Only argument is the consumer chain, to which the packet will be delivered.
     // If this packet will time out on the consumer on delivery,
     // the consumer will be dropped.
-    pure def deliverPacketToConsumer(currentState: ProtocolState, receiver: Chain): Result = {
+    // The first return is the result of the operation, the second result is a boolean
+    // that indicates whether the consumer timed out or not.
+    // If the result has an error, the second return should be ignored.
+    pure def deliverPacketToConsumer(currentState: ProtocolState, receiver: Chain): (Result, bool) = {
         if (not(isCurrentlyConsumer(receiver, currentState.providerState))) {
-            Err("Receiver is not currently a consumer - must have 'running' status!")
+            (Err("Receiver is not currently a consumer - must have 'running' status!"), false)
         } else if (length(currentState.providerState.outstandingPacketsToConsumer.get(receiver)) == 0) {
-            Err("No outstanding packets to deliver")
+            (Err("No outstanding packets to deliver"), false)
         } else {
             val packet = currentState.providerState.outstandingPacketsToConsumer.get(receiver).head()
             // check if the consumer timed out
-            if (packet.sendingTime + CcvTimeout.get(PROVIDER_CHAIN) > currentState.consumerStates.get(receiver).chainState.lastTimestamp) {
+            if (packet.sendingTime + CcvTimeout.get(PROVIDER_CHAIN) < currentState.consumerStates.get(receiver).chainState.lastTimestamp) {
                 // drop consumer
                 val result = getNewConsumerStatusMap(
                     currentState.providerState.consumerStatus,
@@ -354,7 +360,7 @@ module CCV {
                 val newConsumerStatus = result._1
                 val err = result._2
                 if (err != "") {
-                    Err(err)
+                    (Err(err), false)
                 } else {
                     val newProviderState = currentState.providerState.with(
                         "consumerStatus", newConsumerStatus
@@ -362,23 +368,22 @@ module CCV {
                     val newState = currentState.with(
                         "providerState", newProviderState
                     )
-                    // Ok(newState)
-                    Err("not implemented")
+                    (Ok(newState), true) // true because the packet timed out
                 }
             } else {
                 // the packet has not timed out, so receive it on the consumer
                 val result = recvPacketOnConsumer(currentState, receiver, packet)
                 val tmpState = result.newState
                 if (result.hasError) {
-                    Err(result.error.message)
+                    (Err(result.error.message), false)
                 } else {
                     val result2 = removeOutstandingPacketFromProvider(tmpState, receiver)
                     val tmpState2 = result2.newState
                     val err2 = result2.error
                     if (result2.hasError) {
-                        Err(err2.message)
+                        (Err(err2.message), false)
                     } else {
-                        Ok(tmpState2)
+                        (Ok(tmpState2), false) // false because the packet did not time out
                     }
                 }
             }
@@ -831,7 +836,8 @@ module CCVDefaultStateMachine {
     // The receiver receives the next outstanding VSCPacket from the provider.
     // This will time out the consumer if the packet timeout has passed on the receiver.
     action DeliverVSCPacket(receiver: Chain): bool = 
-        val result = deliverPacketToConsumer(currentState, receiver)
+        val resultAndTimeout = deliverPacketToConsumer(currentState, receiver)
+        val result = resultAndTimeout._1
         all {
             result.hasError == false,
             currentState' = result.newState,
@@ -840,7 +846,8 @@ module CCVDefaultStateMachine {
     // The provider receives the next outstanding VSCMaturedPacket from the sender.
     // This will time out the consumer if the packet timeout has passed on the provider.
     action DeliverVSCMaturedPacket(sender: Chain): bool =
-        val result = deliverPacketToProvider(currentState, sender)
+        val resultAndTimeout = deliverPacketToProvider(currentState, sender)
+        val result = resultAndTimeout._1
         all {
             result.hasError == false,
             currentState' = result.newState,
@@ -970,21 +977,44 @@ module CCVLogicTest {
         result.newState.providerState.chainState.votingPowerHistory == List()
     }
 
-    run DeliverPacketToProviderHappyPathTest =
-    {
-        // add a packet on the consumer
-        val testState = _DeliverPacketToProvider_TestState.with(
-            "consumerStates", _DeliverPacketToProvider_TestState.consumerStates.put(
-                "sender", _DeliverPacketToProvider_TestState.consumerStates.get("sender").with(
-                    "outstandingPacketsToProvider", List({
-                        id: 0,
-                        sendingTime: 0
-                    })
-                )
+    // add a packet on the consumer
+    pure val DeliverPacketToProviderHappyPathTest_testState = _DeliverPacketToProvider_TestState.with(
+        "consumerStates", _DeliverPacketToProvider_TestState.consumerStates.put(
+            "sender", _DeliverPacketToProvider_TestState.consumerStates.get("sender").with(
+                "outstandingPacketsToProvider", List({
+                    id: 0,
+                    sendingTime: 0
+                })
+            )
+        )
+    ).with(
+        // put an entry into sentVSCPacket on the provider that corresponds to the packet we put on the consumer
+        "providerState", _DeliverPacketToProvider_TestState.providerState.with(
+            "sentVSCPackets", _DeliverPacketToProvider_TestState.providerState.sentVSCPackets.put(
+                "sender", List({
+                    id: 0,
+                    validatorSet: _DeliverPacketToProvider_TestState.providerState.chainState.currentValidatorSet,
+                    sendingTime: 0
+                })
             )
         )
+    )
+
+    pure val DeliverPacketToProviderHappyPathTest_resultAndTimeout = deliverPacketToProvider(DeliverPacketToProviderHappyPathTest_testState, "sender")
+
+    // test is split to be easier to pinpoint which assertion failed
+    run DidNotTimeOut_DeliverPacketToProviderHappyPathTest =
+    {
+        val result = DeliverPacketToProviderHappyPathTest_resultAndTimeout._1
+        val timeout = DeliverPacketToProviderHappyPathTest_resultAndTimeout._2
+        not(result.hasError) and
+        not(timeout)
+    }
 
-        val result = deliverPacketToProvider(testState, "sender")
+    run StateModificationOK_DeliverPacketToProviderHappyPathTest =
+    {
+        val result = DeliverPacketToProviderHappyPathTest_resultAndTimeout._1
+        val timedOut = DeliverPacketToProviderHappyPathTest_resultAndTimeout._2
         val newProviderState = result.newState.providerState
         val newConsumerState = result.newState.consumerStates.get("sender")
         not(result.hasError) and
@@ -992,17 +1022,32 @@ module CCVLogicTest {
         newConsumerState.outstandingPacketsToProvider.length() == 0
     }
 
-    run DeliverPacketToProviderTimeoutTest =
-    {
-        // set the timestamp to be after the timeout
-        val testState = _DeliverPacketToProvider_TestState.with(
-            "providerState", _DeliverPacketToProvider_TestState.providerState.with(
-                "chainState", _DeliverPacketToProvider_TestState.providerState.chainState.with(
+    // add a packet on the consumer
+    pure val DeliverPacketToProviderTimeoutTest_testState = DeliverPacketToProviderHappyPathTest_testState.with(
+            "providerState", DeliverPacketToProviderHappyPathTest_testState.providerState.with(
+                "chainState", DeliverPacketToProviderHappyPathTest_testState.providerState.chainState.with(
+                    // set the timestamp to be after the timeout
                     "lastTimestamp", CcvTimeout.get("sender") + 1
                 )
             )
         )
-        val result = deliverPacketToProvider(testState, "sender")
+
+    pure val DeliverPacketToProviderTimeoutTest_resultAndTimeout = deliverPacketToProvider(DeliverPacketToProviderTimeoutTest_testState, "sender")
+
+    run DidTimeOut_DeliverPacketToProviderTimeoutTest =
+    {
+        val result = DeliverPacketToProviderTimeoutTest_resultAndTimeout._1
+        val timedOut = DeliverPacketToProviderTimeoutTest_resultAndTimeout._2
+        val newProviderState = result.newState.providerState
+        val newConsumerState = result.newState.consumerStates.get("sender")
+        not(result.hasError) and
+        timedOut
+    }
+
+    run StateModificationOK_DeliverPacketToProviderTimeoutTest =
+    {
+        val result = DeliverPacketToProviderTimeoutTest_resultAndTimeout._1
+        val timedOut = DeliverPacketToProviderTimeoutTest_resultAndTimeout._2
         val newProviderState = result.newState.providerState
         val newConsumerState = result.newState.consumerStates.get("sender")
         not(result.hasError) and

From 09b1b8780a40c3912e32ddb14c77a0a5fbb2079c Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Thu, 28 Sep 2023 18:23:47 +0200
Subject: [PATCH 28/80] Finish test for quint model

---
 tests/difference/core/quint_model/ccv.qnt | 114 ++++++++++++++++++----
 1 file changed, 96 insertions(+), 18 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 0956e4e9bc..65a3418e4e 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -248,7 +248,14 @@ module CCV {
             } else {
                 pure val currentValidatorSet = currentState.providerState.chainState.currentValidatorSet
                 pure val newValidatorSet = getUpdatedValidatorSet(currentValidatorSet, validator, amount)
-                pure val newState = setProviderValidatorSet(currentState, newValidatorSet)
+                // set the validator set changed flag
+                val newProviderState = currentState.providerState.with(
+                    "providerValidatorSetChangedInThisBlock", true
+                )
+                pure val tmpState = currentState.with(
+                    "providerState", newProviderState
+                )
+                pure val newState = setProviderValidatorSet(tmpState, newValidatorSet)
                 Ok(newState)
             }
     }
@@ -432,7 +439,9 @@ module CCV {
                 "consumerStatus", newConsumerStatus
             )
             val providerStateAfterSending =
-            if (currentProviderState.providerValidatorSetChangedInThisBlock and getRunningConsumers(currentState.providerState).size() > 0) {
+            if (currentProviderState.providerValidatorSetChangedInThisBlock and 
+                // important: check this on the provider state after the consumer advancement, not on the current state.
+                getRunningConsumers(providerStateAfterConsumerAdvancement).size() > 0) {
                     providerStateAfterConsumerAdvancement.sendVscPackets()
                 } else {
                     providerStateAfterConsumerAdvancement
@@ -449,7 +458,7 @@ module CCV {
         chain: Chain,
         // by how much the timestamp of the chain should be advanced for the next block
         timeAdvancement: Time): Result = {
-            if (currentState.consumerStates.keys().contains(chain)) {
+            if (not(currentState.consumerStates.keys().contains(chain))) {
                 Err("chain is not a consumer")
             } else {
                 // if the chain is not a consumer, return an error
@@ -872,7 +881,15 @@ module CCVDefaultStateMachine {
             currentState' = result.newState,
         }
 
-    run InitTest: bool = { 
+    // Test a simple happy path where:
+    // * the consumer chain is set to running
+    // * a validator set change happens
+    // * a block is ended on the provider, i.e. a packet is sent to the consumer
+    // * the consumer receives the packet
+    // * the chains wait until the unbonding period is over
+    // * the consumer sends a VSCMaturedPacket to the provider
+    // * the provider receives the VSCMaturedPacket
+    run HappyPathTest: bool = { 
         init.then(
             all {
                 assert(currentState.providerState.consumerStatus == Map(
@@ -894,21 +911,64 @@ module CCVDefaultStateMachine {
                 assert(currentState.providerState.chainState.votingPowerHistory == List(InitialValidatorSet)),
                 assert(currentState.providerState.chainState.currentValidatorSet == InitialValidatorSet),
                 assert(currentState.providerState.chainState.lastTimestamp == 0),
-                val firstState = currentState // snapshot the first state
-                VotingPowerChange("node1", 50).then(all {
-                            // ensure that the only change is that the voting power of node1 is changed
-                            assert(currentState == firstState.with(
-                                "providerState", firstState.providerState.with(
-                                    "chainState", firstState.providerState.chainState.with(
-                                        "currentValidatorSet", firstState.providerState.chainState.currentValidatorSet.put("node1", 50)
-                                    )
-                                )
-                            )),
-                            currentState' = currentState
-                        })
-                    }
+                VotingPowerChange("node1", 50)
+            })
+            .then(
+            all {
+                // the validator set has changed
+                assert(currentState.providerState.chainState.currentValidatorSet == InitialValidatorSet.put("node1", 50)),
+                // start consumer1
+                EndAndBeginBlockForProvider(1 * Second, Set("consumer1"), Set())
+            })
+            .then(
+                all {
+                    // consumer1 was started
+                    assert(currentState.providerState.consumerStatus.get("consumer1") == RUNNING),
+                    // a packet was sent to consumer1
+                    assert(currentState.providerState.outstandingPacketsToConsumer.get("consumer1").length() == 1),
+                    // the validator set on the provider was entered into the history
+                    assert(currentState.providerState.chainState.votingPowerHistory == List(InitialValidatorSet.put("node1", 50), InitialValidatorSet)),
+                    // deliver the packet
+                    DeliverVSCPacket("consumer1")
+                }
+            )
+            .then(
+                all {
+                    // make sure the packet was removed from the provider
+                    assert(currentState.providerState.outstandingPacketsToConsumer.get("consumer1").length() == 0),
+                    // ensure the maturation time was entered on the consumer
+                    assert(currentState.consumerStates.get("consumer1").maturationTimes.keys().size() == 1),
+                    // the validator set was put as the current validator set
+                    assert(currentState.consumerStates.get("consumer1").chainState.currentValidatorSet == InitialValidatorSet.put("node1", 50)),
+                    // advance time on provider until the unbonding period is over
+                    EndAndBeginBlockForProvider(UnbondingPeriodPerChain.get("consumer1"), Set(), Set()),
+                }
+            )
+            .then(
+                // advance time on consumer until the unbonding period is over
+                EndAndBeginBlockForConsumer("consumer1", UnbondingPeriodPerChain.get("consumer1"))
+            )
+            .then(
+                all {
+                    // the packet has matured, so it was sent by the consumer
+                    assert(currentState.consumerStates.get("consumer1").outstandingPacketsToProvider.length() == 1),
+                    // it was removed from the maturationTimes
+                    assert(currentState.consumerStates.get("consumer1").maturationTimes.keys().size() == 0),
+                    // receive the packet on the provider
+                    DeliverVSCMaturedPacket("consumer1")
+                }
+            )
+            .then(
+                all {
+                    // the packet was received on the provider
+                    assert(currentState.providerState.receivedMaturations.size() == 1),
+                    // the packet was removed from the consumer
+                    assert(currentState.consumerStates.get("consumer1").outstandingPacketsToProvider.length() == 0),
+                    currentState' = currentState // just so this still has an effect
+                }
             )
         }
+    
 
 }
 
@@ -964,6 +1024,25 @@ module CCVLogicTest {
         not(finalResult.newState.providerState.chainState.currentValidatorSet.keys().contains("validator"))
     }
 
+    run VotingPowerSetsFlagTest =
+    {
+        // change voting power
+        val tmpResult = votingPowerChange(
+            GetEmptyProtocolState,
+            "validator",
+            5
+        )
+        // but then set it back to the initial value
+        val finalResult = votingPowerChange(
+            tmpResult.newState,
+            "validator",
+            0
+        )
+        // still should set the flag
+        not(finalResult.hasError) and
+        finalResult.newState.providerState.providerValidatorSetChangedInThisBlock
+    }
+
 
     // make sure that VotingPowerChange ONLY changes the current validator set, not the history
     run VotingPowerChangeDoesNotChangeHistoryTest =
@@ -1052,7 +1131,6 @@ module CCVLogicTest {
         val newConsumerState = result.newState.consumerStates.get("sender")
         not(result.hasError) and
         newProviderState.receivedMaturations.size() == 0 and
-        newConsumerState.outstandingPacketsToProvider.length() == 0 and
         newProviderState.consumerStatus.get("sender") == STOPPED
     }
 

From 96c101f710ea92d0f97c90f22ff6cdab5ef01cd2 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 29 Sep 2023 10:37:48 +0200
Subject: [PATCH 29/80] Add README and improve folder structure

---
 tests/difference/core/quint_model/README.md   |  20 +
 tests/difference/core/quint_model/ccv.qnt     | 415 +-----------------
 .../core/quint_model/ccv_statemachine.qnt     | 220 ++++++++++
 .../difference/core/quint_model/ccv_test.qnt  | 225 ++++++++++
 .../{ => libraries}/extraSpells.qnt           |   0
 .../core/quint_model/{ => libraries}/time.qnt |   0
 6 files changed, 468 insertions(+), 412 deletions(-)
 create mode 100644 tests/difference/core/quint_model/README.md
 create mode 100644 tests/difference/core/quint_model/ccv_statemachine.qnt
 create mode 100644 tests/difference/core/quint_model/ccv_test.qnt
 rename tests/difference/core/quint_model/{ => libraries}/extraSpells.qnt (100%)
 rename tests/difference/core/quint_model/{ => libraries}/time.qnt (100%)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
new file mode 100644
index 0000000000..30de96350f
--- /dev/null
+++ b/tests/difference/core/quint_model/README.md
@@ -0,0 +1,20 @@
+This folder contains a Quint model for the core logic of Cross-Chain Validation (CCV).
+
+### File structure
+The files are as follows:
+- ccv.qnt: Contains the type definitions, data structures, functional logic for CCV.
+The core of the protocol.
+- ccv_statemachine.qnt: Contains the state machine layer for CCV. Very roughly speaking, this could be seen as "e2e tests".
+Also contains invariants.
+- ccv_test.qnt: Contains unit tests for the functional layer of CCV.
+- libararies/*: Libraries that don't belong to CCV, but are used by it.
+
+### Model details
+
+To see the data structures used in the model, see the ProtocolState type in ccv.qnt.
+
+The "public" endpoints of the model are those functions that take as an input the protocol state, and return a Result.
+Other functions are for utility.
+
+The parameters of the protocol are defined as consts in ccv.qnt.
+
diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 65a3418e4e..fbb9b08fed 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -1,5 +1,5 @@
 module CCVTypes {
-    import Time.* from "./Time"
+    import Time.* from "./libraries/Time"
 
     type Node = str
     type Chain = str
@@ -213,8 +213,8 @@ module CCV {
     // i.e. when the packet is delivered, the ack is delivered right afterwards.
     // This is because it is nontrivial in practice to get a relayer to relay a packet, but not its ack.
     
-    import extraSpells.* from "./extraSpells"
-    import Time.* from "./Time"
+    import Time.* from "./libraries/Time"
+    import extraSpells.* from "./libraries/extraSpells"
     import CCVTypes.*
   
 
@@ -788,412 +788,3 @@ module CCV {
     run UnbondingPeriodKeysTest =
         UnbondingPeriodPerChain.keys() == ConsumerChains.union(Set(PROVIDER_CHAIN))
 }
-
-
-module CCVDefaultStateMachine {
-    // A basic state machine that utilizes the CCV protocol.
-    import Time.* from "./Time"
-    import CCVTypes.*
-    import extraSpells.* from "./extraSpells"
-
-    pure val consumerChains = Set("consumer1", "consumer2", "consumer3")
-    pure val chains = consumerChains.union(Set(PROVIDER_CHAIN))
-    pure val unbondingPeriods = chains.mapBy(chain => 2 * Week)
-    pure val ccvTimeouts = chains.mapBy(chain => 3 * Week)
-
-    pure val nodes = Set("node1", "node2", "node3", "node4", "node5", "node6", "node7", "node8", "node9", "node10")
-    pure val InitialValidatorSet = nodes.mapBy(node => 100)
-
-    import CCV(VscTimeout = 5 * Week, CcvTimeout = ccvTimeouts, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = consumerChains).*
-
-
-    var currentState: ProtocolState
-
-    action init: bool = all {
-        val providerState = GetEmptyProviderState
-        val consumerStates = ConsumerChains.mapBy(chain => GetEmptyConsumerState)
-        val providerStateWithConsumers = providerState.with(
-            "consumerStatus", 
-            ConsumerChains.mapBy(chain => UNUSED)
-        ).with(
-            "outstandingPacketsToConsumer", 
-            ConsumerChains.mapBy(chain => List())
-        ).with(
-            "sentVSCPackets", 
-            ConsumerChains.mapBy(chain => List())
-        ).with(
-            // set the validator set to be the initial validator set in the history
-            "chainState", providerState.chainState.with(
-                "votingPowerHistory", List(InitialValidatorSet)
-            ).with(
-                "currentValidatorSet", InitialValidatorSet
-            )
-        )
-        currentState' = {
-            providerState: providerStateWithConsumers,
-            consumerStates: consumerStates
-        }
-    }
-
-    action VotingPowerChange(validator: Node, newVotingPower: int): bool = 
-        val result = votingPowerChange(currentState, validator, newVotingPower)
-        all {
-            result.hasError == false,
-            currentState' = result.newState,
-        }
-
-    // The receiver receives the next outstanding VSCPacket from the provider.
-    // This will time out the consumer if the packet timeout has passed on the receiver.
-    action DeliverVSCPacket(receiver: Chain): bool = 
-        val resultAndTimeout = deliverPacketToConsumer(currentState, receiver)
-        val result = resultAndTimeout._1
-        all {
-            result.hasError == false,
-            currentState' = result.newState,
-        }
-
-    // The provider receives the next outstanding VSCMaturedPacket from the sender.
-    // This will time out the consumer if the packet timeout has passed on the provider.
-    action DeliverVSCMaturedPacket(sender: Chain): bool =
-        val resultAndTimeout = deliverPacketToProvider(currentState, sender)
-        val result = resultAndTimeout._1
-        all {
-            result.hasError == false,
-            currentState' = result.newState,
-        }
-
-    action EndAndBeginBlockForProvider(
-        timeAdvancement: Time,
-        consumersToStart: Set[Chain],
-        consumersToStop: Set[Chain]): bool = 
-        val result = endAndBeginBlockForProvider(currentState, timeAdvancement, consumersToStart, consumersToStop)
-        all {
-            result.hasError == false,
-            currentState' = result.newState,
-        }
-
-    action EndAndBeginBlockForConsumer(
-        chain: Chain,
-        timeAdvancement: Time): bool = 
-        val result = endAndBeginBlockForConsumer(currentState, chain, timeAdvancement)
-        all {
-            result.hasError == false,
-            currentState' = result.newState,
-        }
-
-    // Test a simple happy path where:
-    // * the consumer chain is set to running
-    // * a validator set change happens
-    // * a block is ended on the provider, i.e. a packet is sent to the consumer
-    // * the consumer receives the packet
-    // * the chains wait until the unbonding period is over
-    // * the consumer sends a VSCMaturedPacket to the provider
-    // * the provider receives the VSCMaturedPacket
-    run HappyPathTest: bool = { 
-        init.then(
-            all {
-                assert(currentState.providerState.consumerStatus == Map(
-                    "consumer1" -> UNUSED,
-                    "consumer2" -> UNUSED,
-                    "consumer3" -> UNUSED
-                )),
-                assert(currentState.providerState.outstandingPacketsToConsumer == Map(
-                    "consumer1" -> List(),
-                    "consumer2" -> List(),
-                    "consumer3" -> List()
-                )),
-                assert(currentState.providerState.sentVSCPackets == Map(
-                    "consumer1" -> List(),
-                    "consumer2" -> List(),
-                    "consumer3" -> List()
-                )),
-                assert(currentState.consumerStates.keys() == consumerChains),
-                assert(currentState.providerState.chainState.votingPowerHistory == List(InitialValidatorSet)),
-                assert(currentState.providerState.chainState.currentValidatorSet == InitialValidatorSet),
-                assert(currentState.providerState.chainState.lastTimestamp == 0),
-                VotingPowerChange("node1", 50)
-            })
-            .then(
-            all {
-                // the validator set has changed
-                assert(currentState.providerState.chainState.currentValidatorSet == InitialValidatorSet.put("node1", 50)),
-                // start consumer1
-                EndAndBeginBlockForProvider(1 * Second, Set("consumer1"), Set())
-            })
-            .then(
-                all {
-                    // consumer1 was started
-                    assert(currentState.providerState.consumerStatus.get("consumer1") == RUNNING),
-                    // a packet was sent to consumer1
-                    assert(currentState.providerState.outstandingPacketsToConsumer.get("consumer1").length() == 1),
-                    // the validator set on the provider was entered into the history
-                    assert(currentState.providerState.chainState.votingPowerHistory == List(InitialValidatorSet.put("node1", 50), InitialValidatorSet)),
-                    // deliver the packet
-                    DeliverVSCPacket("consumer1")
-                }
-            )
-            .then(
-                all {
-                    // make sure the packet was removed from the provider
-                    assert(currentState.providerState.outstandingPacketsToConsumer.get("consumer1").length() == 0),
-                    // ensure the maturation time was entered on the consumer
-                    assert(currentState.consumerStates.get("consumer1").maturationTimes.keys().size() == 1),
-                    // the validator set was put as the current validator set
-                    assert(currentState.consumerStates.get("consumer1").chainState.currentValidatorSet == InitialValidatorSet.put("node1", 50)),
-                    // advance time on provider until the unbonding period is over
-                    EndAndBeginBlockForProvider(UnbondingPeriodPerChain.get("consumer1"), Set(), Set()),
-                }
-            )
-            .then(
-                // advance time on consumer until the unbonding period is over
-                EndAndBeginBlockForConsumer("consumer1", UnbondingPeriodPerChain.get("consumer1"))
-            )
-            .then(
-                all {
-                    // the packet has matured, so it was sent by the consumer
-                    assert(currentState.consumerStates.get("consumer1").outstandingPacketsToProvider.length() == 1),
-                    // it was removed from the maturationTimes
-                    assert(currentState.consumerStates.get("consumer1").maturationTimes.keys().size() == 0),
-                    // receive the packet on the provider
-                    DeliverVSCMaturedPacket("consumer1")
-                }
-            )
-            .then(
-                all {
-                    // the packet was received on the provider
-                    assert(currentState.providerState.receivedMaturations.size() == 1),
-                    // the packet was removed from the consumer
-                    assert(currentState.consumerStates.get("consumer1").outstandingPacketsToProvider.length() == 0),
-                    currentState' = currentState // just so this still has an effect
-                }
-            )
-        }
-    
-
-}
-
-// contains test logic for the stateless functions in the CCV module
-module CCVLogicTest {
-    import CCVTypes.*
-    import Time.* from "./Time"
-    import extraSpells.* from "./extraSpells"
-
-    pure val consumerChains = Set("sender", "receiver")
-    pure val chains = consumerChains.union(Set(PROVIDER_CHAIN))
-    pure val unbondingPeriods = chains.mapBy(chain => 2 * Week)
-    pure val ccvTimeouts = chains.mapBy(chain => 3 * Week)
-
-    import CCV(VscTimeout = 5 * Week, CcvTimeout = ccvTimeouts, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = consumerChains).*
-
-    // negative voting powers give an error
-    run VotingPowerNegativeTest =
-    {
-        votingPowerChange(
-            GetEmptyProtocolState,
-            "validator",
-            -1
-        ).hasError
-    }
-
-    run VotingPowerOkTest =
-    {
-        val result = votingPowerChange(
-            GetEmptyProtocolState,
-            "validator",
-            5
-        )
-        not(result.hasError) and
-        result.newState.providerState.chainState.currentValidatorSet.keys().contains("validator") and
-        result.newState.providerState.chainState.currentValidatorSet.get("validator") == 5
-    }
-
-    // validators that get zero voting power are removed
-    run VotingPowerZeroTest =
-    {
-        val tmpResult = votingPowerChange(
-            GetEmptyProtocolState,
-            "validator",
-            5
-        )
-        val finalResult = votingPowerChange(
-            tmpResult.newState,
-            "validator",
-            0
-        )
-        not(finalResult.hasError) and
-        not(finalResult.newState.providerState.chainState.currentValidatorSet.keys().contains("validator"))
-    }
-
-    run VotingPowerSetsFlagTest =
-    {
-        // change voting power
-        val tmpResult = votingPowerChange(
-            GetEmptyProtocolState,
-            "validator",
-            5
-        )
-        // but then set it back to the initial value
-        val finalResult = votingPowerChange(
-            tmpResult.newState,
-            "validator",
-            0
-        )
-        // still should set the flag
-        not(finalResult.hasError) and
-        finalResult.newState.providerState.providerValidatorSetChangedInThisBlock
-    }
-
-
-    // make sure that VotingPowerChange ONLY changes the current validator set, not the history
-    run VotingPowerChangeDoesNotChangeHistoryTest =
-    {
-        val result = votingPowerChange(
-            GetEmptyProtocolState,
-            "validator",
-            0
-        )
-        not(result.hasError) and
-        result.newState.providerState.chainState.votingPowerHistory == List()
-    }
-
-    // add a packet on the consumer
-    pure val DeliverPacketToProviderHappyPathTest_testState = _DeliverPacketToProvider_TestState.with(
-        "consumerStates", _DeliverPacketToProvider_TestState.consumerStates.put(
-            "sender", _DeliverPacketToProvider_TestState.consumerStates.get("sender").with(
-                "outstandingPacketsToProvider", List({
-                    id: 0,
-                    sendingTime: 0
-                })
-            )
-        )
-    ).with(
-        // put an entry into sentVSCPacket on the provider that corresponds to the packet we put on the consumer
-        "providerState", _DeliverPacketToProvider_TestState.providerState.with(
-            "sentVSCPackets", _DeliverPacketToProvider_TestState.providerState.sentVSCPackets.put(
-                "sender", List({
-                    id: 0,
-                    validatorSet: _DeliverPacketToProvider_TestState.providerState.chainState.currentValidatorSet,
-                    sendingTime: 0
-                })
-            )
-        )
-    )
-
-    pure val DeliverPacketToProviderHappyPathTest_resultAndTimeout = deliverPacketToProvider(DeliverPacketToProviderHappyPathTest_testState, "sender")
-
-    // test is split to be easier to pinpoint which assertion failed
-    run DidNotTimeOut_DeliverPacketToProviderHappyPathTest =
-    {
-        val result = DeliverPacketToProviderHappyPathTest_resultAndTimeout._1
-        val timeout = DeliverPacketToProviderHappyPathTest_resultAndTimeout._2
-        not(result.hasError) and
-        not(timeout)
-    }
-
-    run StateModificationOK_DeliverPacketToProviderHappyPathTest =
-    {
-        val result = DeliverPacketToProviderHappyPathTest_resultAndTimeout._1
-        val timedOut = DeliverPacketToProviderHappyPathTest_resultAndTimeout._2
-        val newProviderState = result.newState.providerState
-        val newConsumerState = result.newState.consumerStates.get("sender")
-        not(result.hasError) and
-        newProviderState.receivedMaturations.size() == 1 and
-        newConsumerState.outstandingPacketsToProvider.length() == 0
-    }
-
-    // add a packet on the consumer
-    pure val DeliverPacketToProviderTimeoutTest_testState = DeliverPacketToProviderHappyPathTest_testState.with(
-            "providerState", DeliverPacketToProviderHappyPathTest_testState.providerState.with(
-                "chainState", DeliverPacketToProviderHappyPathTest_testState.providerState.chainState.with(
-                    // set the timestamp to be after the timeout
-                    "lastTimestamp", CcvTimeout.get("sender") + 1
-                )
-            )
-        )
-
-    pure val DeliverPacketToProviderTimeoutTest_resultAndTimeout = deliverPacketToProvider(DeliverPacketToProviderTimeoutTest_testState, "sender")
-
-    run DidTimeOut_DeliverPacketToProviderTimeoutTest =
-    {
-        val result = DeliverPacketToProviderTimeoutTest_resultAndTimeout._1
-        val timedOut = DeliverPacketToProviderTimeoutTest_resultAndTimeout._2
-        val newProviderState = result.newState.providerState
-        val newConsumerState = result.newState.consumerStates.get("sender")
-        not(result.hasError) and
-        timedOut
-    }
-
-    run StateModificationOK_DeliverPacketToProviderTimeoutTest =
-    {
-        val result = DeliverPacketToProviderTimeoutTest_resultAndTimeout._1
-        val timedOut = DeliverPacketToProviderTimeoutTest_resultAndTimeout._2
-        val newProviderState = result.newState.providerState
-        val newConsumerState = result.newState.consumerStates.get("sender")
-        not(result.hasError) and
-        newProviderState.receivedMaturations.size() == 0 and
-        newProviderState.consumerStatus.get("sender") == STOPPED
-    }
-
-    run ConsumerStatusMapHappyPathTest = 
-    {
-        val currentConsumerStatusMap = Map(
-            "chain1" -> UNUSED,
-            "chain2" -> RUNNING,
-            "chain3" -> STOPPED
-        )
-        val res = getNewConsumerStatusMap(
-            currentConsumerStatusMap,
-            Set("chain1"),
-            Set("chain2")
-        )
-        res._2 == "" and
-        res._1.get("chain1") == RUNNING and
-        res._1.get("chain2") == STOPPED and
-        res._1.get("chain3") == STOPPED
-    }
-
-    run ConsumerStatusMapAlreadyRunningTest =
-    {
-        val currentConsumerStatusMap = Map(
-            "chain1" -> UNUSED,
-            "chain2" -> RUNNING,
-            "chain3" -> STOPPED
-        )
-        val res = getNewConsumerStatusMap(
-            currentConsumerStatusMap,
-            Set("chain2"),
-            Set("chain3")
-        )
-        res._2 == "Cannot start a consumer that is already running"
-    }
-
-    run ConsumerStatusMapAlreadyStoppedTest =
-    {
-        val currentConsumerStatusMap = Map(
-            "chain1" -> UNUSED,
-            "chain2" -> RUNNING,
-            "chain3" -> STOPPED
-        )
-        val res = getNewConsumerStatusMap(
-            currentConsumerStatusMap,
-            Set("chain1"),
-            Set("chain3")
-        )
-        res._2 == "Cannot stop a consumer that is not running"
-    }
-
-    run ChainBothInStartAndStopTest =
-    {
-        val currentConsumerStatusMap = Map(
-            "chain1" -> UNUSED,
-            "chain2" -> RUNNING,
-            "chain3" -> STOPPED
-        )
-        val res = getNewConsumerStatusMap(
-            currentConsumerStatusMap,
-            Set("chain1"),
-            Set("chain1")
-        )
-        res._2 == "Cannot start and stop a consumer at the same time"
-    }
-}
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
new file mode 100644
index 0000000000..142db75431
--- /dev/null
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -0,0 +1,220 @@
+module CCVDefaultStateMachine {
+    // A basic state machine that utilizes the CCV protocol.
+    import Time.* from "./libraries/time"
+    import extraSpells.* from "./libraries/extraSpells"
+    import CCVTypes.* from "./ccv"
+
+    pure val consumerChains = Set("consumer1", "consumer2", "consumer3")
+    pure val chains = consumerChains.union(Set(PROVIDER_CHAIN))
+    pure val unbondingPeriods = chains.mapBy(chain => 2 * Week)
+    pure val ccvTimeouts = chains.mapBy(chain => 3 * Week)
+
+    pure val nodes = Set("node1", "node2", "node3", "node4", "node5", "node6", "node7", "node8", "node9", "node10")
+    pure val InitialValidatorSet = nodes.mapBy(node => 100)
+
+    import CCV(VscTimeout = 5 * Week, CcvTimeout = ccvTimeouts, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = consumerChains).* from "./ccv"
+
+
+    var currentState: ProtocolState
+
+    action init: bool = all {
+        val providerState = GetEmptyProviderState
+        val consumerStates = ConsumerChains.mapBy(chain => GetEmptyConsumerState)
+        val providerStateWithConsumers = providerState.with(
+            "consumerStatus", 
+            ConsumerChains.mapBy(chain => UNUSED)
+        ).with(
+            "outstandingPacketsToConsumer", 
+            ConsumerChains.mapBy(chain => List())
+        ).with(
+            "sentVSCPackets", 
+            ConsumerChains.mapBy(chain => List())
+        ).with(
+            // set the validator set to be the initial validator set in the history
+            "chainState", providerState.chainState.with(
+                "votingPowerHistory", List(InitialValidatorSet)
+            ).with(
+                "currentValidatorSet", InitialValidatorSet
+            )
+        )
+        currentState' = {
+            providerState: providerStateWithConsumers,
+            consumerStates: consumerStates
+        }
+    }
+
+    action VotingPowerChange(validator: Node, newVotingPower: int): bool = 
+        val result = votingPowerChange(currentState, validator, newVotingPower)
+        all {
+            result.hasError == false,
+            currentState' = result.newState,
+        }
+
+    // The receiver receives the next outstanding VSCPacket from the provider.
+    // This will time out the consumer if the packet timeout has passed on the receiver.
+    action DeliverVSCPacket(receiver: Chain): bool = 
+        val resultAndTimeout = deliverPacketToConsumer(currentState, receiver)
+        val result = resultAndTimeout._1
+        all {
+            result.hasError == false,
+            currentState' = result.newState,
+        }
+
+    // The provider receives the next outstanding VSCMaturedPacket from the sender.
+    // This will time out the consumer if the packet timeout has passed on the provider.
+    action DeliverVSCMaturedPacket(sender: Chain): bool =
+        val resultAndTimeout = deliverPacketToProvider(currentState, sender)
+        val result = resultAndTimeout._1
+        all {
+            result.hasError == false,
+            currentState' = result.newState,
+        }
+
+    action EndAndBeginBlockForProvider(
+        timeAdvancement: Time,
+        consumersToStart: Set[Chain],
+        consumersToStop: Set[Chain]): bool = 
+        val result = endAndBeginBlockForProvider(currentState, timeAdvancement, consumersToStart, consumersToStop)
+        all {
+            result.hasError == false,
+            currentState' = result.newState,
+        }
+
+    action EndAndBeginBlockForConsumer(
+        chain: Chain,
+        timeAdvancement: Time): bool = 
+        val result = endAndBeginBlockForConsumer(currentState, chain, timeAdvancement)
+        all {
+            result.hasError == false,
+            currentState' = result.newState,
+        }
+
+    action step = any {
+        nondet node = oneOf(nodes)
+        // very restricted set of voting powers. exact values are not important,
+        // and this keeps the state space smaller.
+        // 0 for getting a validator out of the validator set, and two non-zero values
+        nondet newVotingPower = oneOf(0, 50, 100)
+        VotingPowerChange(node, newVotingPower),
+
+        nondet chain = oneOf(consumerChains)
+        // a few different values for time advancements.
+        // to keep the number of possible steps small, we only have a few different values.
+        // Roughly, 1s for very small advances (like between blocks),
+        // and then longer values for increasingly severe downtime scenarios.
+        // Note that these can still be combined, so in effect we can get all time advancements by any amount of seconds.
+        nondet timeAdvancement = oneOf(1 * Second, 1 * Day, 1 * Week, 1 * Month)
+        EndAndBeginBlockForConsumer(chain, timeAdvancement),
+
+        val runningConsumers = currentState.providerState.consumerStatus.filter((chain, status) => status == RUNNING).keys()
+        val unusedConsumers = currentState.providerState.consumerStatus.filter((chain, status) => status == UNUSED).keys()
+        nondet consumersToStart = oneOf(runningConsumers.powerset())
+        nondet consumersToStop = oneOf(unusedConsumers.powerset())
+        nondet timeAdvancement = oneOf(1 * Second, 1 * Day, 1 * Week, 1 * Month)
+        EndAndBeginBlockForProvider(timeAdvancement, consumersToStart, consumersToStop),
+
+        // 
+        // try to send a packet. we could filter by chains that can actually send,
+        // but it's probably not much faster than just trying and failing.
+        nondet sender = oneOf(consumerChains)
+        DeliverVSCMaturedPacket(sender),
+
+        // again, we could filter by chains that can actually receive,
+        // but it's probably not much faster than just trying and failing.
+        nondet recciver = oneOf(consumerChains)
+        DeliverVSCPacket(recciver),
+    }
+
+    // ==================
+    // MANUAL TEST CASES
+    // ==================
+    // Manually written test cases to get confidence in the base operation of the protocol.
+
+    // Test a simple happy path where:
+    // * the consumer chain is set to running
+    // * a validator set change happens
+    // * a block is ended on the provider, i.e. a packet is sent to the consumer
+    // * the consumer receives the packet
+    // * the chains wait until the unbonding period is over
+    // * the consumer sends a VSCMaturedPacket to the provider
+    // * the provider receives the VSCMaturedPacket
+    run HappyPathTest: bool = { 
+        init.then(
+            all {
+                assert(currentState.providerState.consumerStatus == Map(
+                    "consumer1" -> UNUSED,
+                    "consumer2" -> UNUSED,
+                    "consumer3" -> UNUSED
+                )),
+                assert(currentState.providerState.outstandingPacketsToConsumer == Map(
+                    "consumer1" -> List(),
+                    "consumer2" -> List(),
+                    "consumer3" -> List()
+                )),
+                assert(currentState.providerState.sentVSCPackets == Map(
+                    "consumer1" -> List(),
+                    "consumer2" -> List(),
+                    "consumer3" -> List()
+                )),
+                assert(currentState.consumerStates.keys() == consumerChains),
+                assert(currentState.providerState.chainState.votingPowerHistory == List(InitialValidatorSet)),
+                assert(currentState.providerState.chainState.currentValidatorSet == InitialValidatorSet),
+                assert(currentState.providerState.chainState.lastTimestamp == 0),
+                VotingPowerChange("node1", 50)
+            })
+            .then(
+            all {
+                // the validator set has changed
+                assert(currentState.providerState.chainState.currentValidatorSet == InitialValidatorSet.put("node1", 50)),
+                // start consumer1
+                EndAndBeginBlockForProvider(1 * Second, Set("consumer1"), Set())
+            })
+            .then(
+                all {
+                    // consumer1 was started
+                    assert(currentState.providerState.consumerStatus.get("consumer1") == RUNNING),
+                    // a packet was sent to consumer1
+                    assert(currentState.providerState.outstandingPacketsToConsumer.get("consumer1").length() == 1),
+                    // the validator set on the provider was entered into the history
+                    assert(currentState.providerState.chainState.votingPowerHistory == List(InitialValidatorSet.put("node1", 50), InitialValidatorSet)),
+                    // deliver the packet
+                    DeliverVSCPacket("consumer1")
+                }
+            )
+            .then(
+                all {
+                    // make sure the packet was removed from the provider
+                    assert(currentState.providerState.outstandingPacketsToConsumer.get("consumer1").length() == 0),
+                    // ensure the maturation time was entered on the consumer
+                    assert(currentState.consumerStates.get("consumer1").maturationTimes.keys().size() == 1),
+                    // the validator set was put as the current validator set
+                    assert(currentState.consumerStates.get("consumer1").chainState.currentValidatorSet == InitialValidatorSet.put("node1", 50)),
+                    // advance time on provider until the unbonding period is over
+                    EndAndBeginBlockForProvider(UnbondingPeriodPerChain.get("consumer1"), Set(), Set()),
+                }
+            )
+            .then(
+                // advance time on consumer until the unbonding period is over
+                EndAndBeginBlockForConsumer("consumer1", UnbondingPeriodPerChain.get("consumer1"))
+            )
+            .then(
+                all {
+                    // the packet has matured, so it was sent by the consumer
+                    assert(currentState.consumerStates.get("consumer1").outstandingPacketsToProvider.length() == 1),
+                    // it was removed from the maturationTimes
+                    assert(currentState.consumerStates.get("consumer1").maturationTimes.keys().size() == 0),
+                    // receive the packet on the provider
+                    DeliverVSCMaturedPacket("consumer1")
+                }
+            )
+            .then(
+                all {
+                    // the packet was received on the provider
+                    assert(currentState.providerState.receivedMaturations.size() == 1),
+                    // the packet was removed from the consumer
+                    assert(currentState.consumerStates.get("consumer1").outstandingPacketsToProvider.length() == 0),
+                    currentState' = currentState // just so this still has an effect
+                }
+            )
+        }
+}
\ No newline at end of file
diff --git a/tests/difference/core/quint_model/ccv_test.qnt b/tests/difference/core/quint_model/ccv_test.qnt
new file mode 100644
index 0000000000..31c46c0e62
--- /dev/null
+++ b/tests/difference/core/quint_model/ccv_test.qnt
@@ -0,0 +1,225 @@
+// contains test logic for the stateless functions in the CCV module
+module CCVTest {
+    import CCVTypes.* from "./ccv"
+    import Time.* from "./libraries/Time"
+    import extraSpells.* from "./libraries/extraSpells"
+
+    pure val consumerChains = Set("sender", "receiver")
+    pure val chains = consumerChains.union(Set(PROVIDER_CHAIN))
+    pure val unbondingPeriods = chains.mapBy(chain => 2 * Week)
+    pure val ccvTimeouts = chains.mapBy(chain => 3 * Week)
+
+    import CCV(VscTimeout = 5 * Week, CcvTimeout = ccvTimeouts, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = consumerChains).* from "./ccv"
+
+    // negative voting powers give an error
+    run VotingPowerNegativeTest =
+    {
+        votingPowerChange(
+            GetEmptyProtocolState,
+            "validator",
+            -1
+        ).hasError
+    }
+
+    run VotingPowerOkTest =
+    {
+        val result = votingPowerChange(
+            GetEmptyProtocolState,
+            "validator",
+            5
+        )
+        not(result.hasError) and
+        result.newState.providerState.chainState.currentValidatorSet.keys().contains("validator") and
+        result.newState.providerState.chainState.currentValidatorSet.get("validator") == 5
+    }
+
+    // validators that get zero voting power are removed
+    run VotingPowerZeroTest =
+    {
+        val tmpResult = votingPowerChange(
+            GetEmptyProtocolState,
+            "validator",
+            5
+        )
+        val finalResult = votingPowerChange(
+            tmpResult.newState,
+            "validator",
+            0
+        )
+        not(finalResult.hasError) and
+        not(finalResult.newState.providerState.chainState.currentValidatorSet.keys().contains("validator"))
+    }
+
+    run VotingPowerSetsFlagTest =
+    {
+        // change voting power
+        val tmpResult = votingPowerChange(
+            GetEmptyProtocolState,
+            "validator",
+            5
+        )
+        // but then set it back to the initial value
+        val finalResult = votingPowerChange(
+            tmpResult.newState,
+            "validator",
+            0
+        )
+        // still should set the flag
+        not(finalResult.hasError) and
+        finalResult.newState.providerState.providerValidatorSetChangedInThisBlock
+    }
+
+
+    // make sure that VotingPowerChange ONLY changes the current validator set, not the history
+    run VotingPowerChangeDoesNotChangeHistoryTest =
+    {
+        val result = votingPowerChange(
+            GetEmptyProtocolState,
+            "validator",
+            0
+        )
+        not(result.hasError) and
+        result.newState.providerState.chainState.votingPowerHistory == List()
+    }
+
+    // add a packet on the consumer
+    pure val DeliverPacketToProviderHappyPathTest_testState = _DeliverPacketToProvider_TestState.with(
+        "consumerStates", _DeliverPacketToProvider_TestState.consumerStates.put(
+            "sender", _DeliverPacketToProvider_TestState.consumerStates.get("sender").with(
+                "outstandingPacketsToProvider", List({
+                    id: 0,
+                    sendingTime: 0
+                })
+            )
+        )
+    ).with(
+        // put an entry into sentVSCPacket on the provider that corresponds to the packet we put on the consumer
+        "providerState", _DeliverPacketToProvider_TestState.providerState.with(
+            "sentVSCPackets", _DeliverPacketToProvider_TestState.providerState.sentVSCPackets.put(
+                "sender", List({
+                    id: 0,
+                    validatorSet: _DeliverPacketToProvider_TestState.providerState.chainState.currentValidatorSet,
+                    sendingTime: 0
+                })
+            )
+        )
+    )
+
+    pure val DeliverPacketToProviderHappyPathTest_resultAndTimeout = deliverPacketToProvider(DeliverPacketToProviderHappyPathTest_testState, "sender")
+
+    // test is split to be easier to pinpoint which assertion failed
+    run DidNotTimeOut_DeliverPacketToProviderHappyPathTest =
+    {
+        val result = DeliverPacketToProviderHappyPathTest_resultAndTimeout._1
+        val timeout = DeliverPacketToProviderHappyPathTest_resultAndTimeout._2
+        not(result.hasError) and
+        not(timeout)
+    }
+
+    run StateModificationOK_DeliverPacketToProviderHappyPathTest =
+    {
+        val result = DeliverPacketToProviderHappyPathTest_resultAndTimeout._1
+        val timedOut = DeliverPacketToProviderHappyPathTest_resultAndTimeout._2
+        val newProviderState = result.newState.providerState
+        val newConsumerState = result.newState.consumerStates.get("sender")
+        not(result.hasError) and
+        newProviderState.receivedMaturations.size() == 1 and
+        newConsumerState.outstandingPacketsToProvider.length() == 0
+    }
+
+    // add a packet on the consumer
+    pure val DeliverPacketToProviderTimeoutTest_testState = DeliverPacketToProviderHappyPathTest_testState.with(
+            "providerState", DeliverPacketToProviderHappyPathTest_testState.providerState.with(
+                "chainState", DeliverPacketToProviderHappyPathTest_testState.providerState.chainState.with(
+                    // set the timestamp to be after the timeout
+                    "lastTimestamp", CcvTimeout.get("sender") + 1
+                )
+            )
+        )
+
+    pure val DeliverPacketToProviderTimeoutTest_resultAndTimeout = deliverPacketToProvider(DeliverPacketToProviderTimeoutTest_testState, "sender")
+
+    run DidTimeOut_DeliverPacketToProviderTimeoutTest =
+    {
+        val result = DeliverPacketToProviderTimeoutTest_resultAndTimeout._1
+        val timedOut = DeliverPacketToProviderTimeoutTest_resultAndTimeout._2
+        val newProviderState = result.newState.providerState
+        val newConsumerState = result.newState.consumerStates.get("sender")
+        not(result.hasError) and
+        timedOut
+    }
+
+    run StateModificationOK_DeliverPacketToProviderTimeoutTest =
+    {
+        val result = DeliverPacketToProviderTimeoutTest_resultAndTimeout._1
+        val timedOut = DeliverPacketToProviderTimeoutTest_resultAndTimeout._2
+        val newProviderState = result.newState.providerState
+        val newConsumerState = result.newState.consumerStates.get("sender")
+        not(result.hasError) and
+        newProviderState.receivedMaturations.size() == 0 and
+        newProviderState.consumerStatus.get("sender") == STOPPED
+    }
+
+    run ConsumerStatusMapHappyPathTest = 
+    {
+        val currentConsumerStatusMap = Map(
+            "chain1" -> UNUSED,
+            "chain2" -> RUNNING,
+            "chain3" -> STOPPED
+        )
+        val res = getNewConsumerStatusMap(
+            currentConsumerStatusMap,
+            Set("chain1"),
+            Set("chain2")
+        )
+        res._2 == "" and
+        res._1.get("chain1") == RUNNING and
+        res._1.get("chain2") == STOPPED and
+        res._1.get("chain3") == STOPPED
+    }
+
+    run ConsumerStatusMapAlreadyRunningTest =
+    {
+        val currentConsumerStatusMap = Map(
+            "chain1" -> UNUSED,
+            "chain2" -> RUNNING,
+            "chain3" -> STOPPED
+        )
+        val res = getNewConsumerStatusMap(
+            currentConsumerStatusMap,
+            Set("chain2"),
+            Set("chain3")
+        )
+        res._2 == "Cannot start a consumer that is already running"
+    }
+
+    run ConsumerStatusMapAlreadyStoppedTest =
+    {
+        val currentConsumerStatusMap = Map(
+            "chain1" -> UNUSED,
+            "chain2" -> RUNNING,
+            "chain3" -> STOPPED
+        )
+        val res = getNewConsumerStatusMap(
+            currentConsumerStatusMap,
+            Set("chain1"),
+            Set("chain3")
+        )
+        res._2 == "Cannot stop a consumer that is not running"
+    }
+
+    run ChainBothInStartAndStopTest =
+    {
+        val currentConsumerStatusMap = Map(
+            "chain1" -> UNUSED,
+            "chain2" -> RUNNING,
+            "chain3" -> STOPPED
+        )
+        val res = getNewConsumerStatusMap(
+            currentConsumerStatusMap,
+            Set("chain1"),
+            Set("chain1")
+        )
+        res._2 == "Cannot start and stop a consumer at the same time"
+    }
+}
\ No newline at end of file
diff --git a/tests/difference/core/quint_model/extraSpells.qnt b/tests/difference/core/quint_model/libraries/extraSpells.qnt
similarity index 100%
rename from tests/difference/core/quint_model/extraSpells.qnt
rename to tests/difference/core/quint_model/libraries/extraSpells.qnt
diff --git a/tests/difference/core/quint_model/time.qnt b/tests/difference/core/quint_model/libraries/time.qnt
similarity index 100%
rename from tests/difference/core/quint_model/time.qnt
rename to tests/difference/core/quint_model/libraries/time.qnt

From aa2989e40e6fb4578adb5e6b94752c36670f3cdc Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 29 Sep 2023 10:54:08 +0200
Subject: [PATCH 30/80] Fix import

---
 .../core/quint_model/ccv_statemachine.qnt     | 22 +++++++++++++------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index 142db75431..2b4e857078 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -1,8 +1,8 @@
 module CCVDefaultStateMachine {
     // A basic state machine that utilizes the CCV protocol.
-    import Time.* from "./libraries/time"
-    import extraSpells.* from "./libraries/extraSpells"
     import CCVTypes.* from "./ccv"
+    import Time.* from "./libraries/Time"
+    import extraSpells.* from "./libraries/extraSpells"
 
     pure val consumerChains = Set("consumer1", "consumer2", "consumer3")
     pure val chains = consumerChains.union(Set(PROVIDER_CHAIN))
@@ -89,12 +89,19 @@ module CCVDefaultStateMachine {
             currentState' = result.newState,
         }
 
+    // a few different values for time advancements.
+    // to keep the number of possible steps small, we only have a few different values.
+    // Roughly, 1s for very small advances (like between blocks),
+    // and then longer values for increasingly severe downtime scenarios.
+    // Note that these can still be combined, so in effect we can get all time advancements by any amount of seconds.
+    pure val timeAdvancements = Set(1 * Second, 1 * Day, 1 * Week, 4 * Week)
+
     action step = any {
         nondet node = oneOf(nodes)
         // very restricted set of voting powers. exact values are not important,
         // and this keeps the state space smaller.
         // 0 for getting a validator out of the validator set, and two non-zero values
-        nondet newVotingPower = oneOf(0, 50, 100)
+        nondet newVotingPower = oneOf(Set(0, 50, 100))
         VotingPowerChange(node, newVotingPower),
 
         nondet chain = oneOf(consumerChains)
@@ -103,14 +110,15 @@ module CCVDefaultStateMachine {
         // Roughly, 1s for very small advances (like between blocks),
         // and then longer values for increasingly severe downtime scenarios.
         // Note that these can still be combined, so in effect we can get all time advancements by any amount of seconds.
-        nondet timeAdvancement = oneOf(1 * Second, 1 * Day, 1 * Week, 1 * Month)
+        nondet timeAdvancement = oneOf(timeAdvancements)
         EndAndBeginBlockForConsumer(chain, timeAdvancement),
 
-        val runningConsumers = currentState.providerState.consumerStatus.filter((chain, status) => status == RUNNING).keys()
-        val unusedConsumers = currentState.providerState.consumerStatus.filter((chain, status) => status == UNUSED).keys()
+        val consumerStatus = currentState.providerState.consumerStatus
+        val runningConsumers = consumerStatus.keys().filter(chain => consumerStatus.get(chain) == RUNNING)
+        val unusedConsumers = consumerStatus.keys().filter(chain => consumerStatus.get(chain) == UNUSED)
         nondet consumersToStart = oneOf(runningConsumers.powerset())
         nondet consumersToStop = oneOf(unusedConsumers.powerset())
-        nondet timeAdvancement = oneOf(1 * Second, 1 * Day, 1 * Week, 1 * Month)
+        nondet timeAdvancement = oneOf(timeAdvancements)
         EndAndBeginBlockForProvider(timeAdvancement, consumersToStart, consumersToStop),
 
         // 

From c291303159ce3c28cf00484e34252e07fd94bffc Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 29 Sep 2023 12:51:31 +0200
Subject: [PATCH 31/80] Add some invariants

---
 tests/difference/core/quint_model/ccv.qnt     |   7 ++
 .../core/quint_model/ccv_statemachine.qnt     | 104 +++++++++++++++++-
 2 files changed, 107 insertions(+), 4 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index fbb9b08fed..3f6a8e1982 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -738,6 +738,13 @@ module CCV {
         )
     }
 
+    // Returns the set of all consumer chains that currently have the status UNUSED.
+    pure def getUnusedConsumers(providerState: ProviderState): Set[Chain] = {
+        providerState.consumerStatus.keys().filter(
+            chain => providerState.consumerStatus.get(chain) == UNUSED
+        )
+    }
+
     // Returns whether the consumer has timed out due to the VSCTimeout, and an error message.
     // If the second return is not equal to "", the first return should be ignored.
     // If it is equal to "", the first return will be true if the consumer has timed out and should be dropped,
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index 2b4e857078..024731e446 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -16,6 +16,14 @@ module CCVDefaultStateMachine {
 
 
     var currentState: ProtocolState
+    
+    // bookkeeping
+    var lastAction: str
+
+    // some utility stateful vals to make invariants easier to define
+    val providerValidatorHistory = currentState.providerState.chainState.votingPowerHistory
+    val runningConsumers = getRunningConsumers(currentState.providerState)
+    val unusedConsumers = getUnusedConsumers(currentState.providerState)
 
     action init: bool = all {
         val providerState = GetEmptyProviderState
@@ -40,7 +48,8 @@ module CCVDefaultStateMachine {
         currentState' = {
             providerState: providerStateWithConsumers,
             consumerStates: consumerStates
-        }
+        },
+        lastAction' = "init"
     }
 
     action VotingPowerChange(validator: Node, newVotingPower: int): bool = 
@@ -48,6 +57,7 @@ module CCVDefaultStateMachine {
         all {
             result.hasError == false,
             currentState' = result.newState,
+            lastAction' = "VotingPowerChange"
         }
 
     // The receiver receives the next outstanding VSCPacket from the provider.
@@ -58,6 +68,7 @@ module CCVDefaultStateMachine {
         all {
             result.hasError == false,
             currentState' = result.newState,
+            lastAction' = "DeliverVSCPacket"
         }
 
     // The provider receives the next outstanding VSCMaturedPacket from the sender.
@@ -68,6 +79,7 @@ module CCVDefaultStateMachine {
         all {
             result.hasError == false,
             currentState' = result.newState,
+            lastAction' = "DeliverVSCMaturedPacket"
         }
 
     action EndAndBeginBlockForProvider(
@@ -78,6 +90,7 @@ module CCVDefaultStateMachine {
         all {
             result.hasError == false,
             currentState' = result.newState,
+            lastAction' = "EndAndBeginBlockForProvider"
         }
 
     action EndAndBeginBlockForConsumer(
@@ -87,6 +100,7 @@ module CCVDefaultStateMachine {
         all {
             result.hasError == false,
             currentState' = result.newState,
+            lastAction' = "EndAndBeginBlockForConsumer"
         }
 
     // a few different values for time advancements.
@@ -114,8 +128,6 @@ module CCVDefaultStateMachine {
         EndAndBeginBlockForConsumer(chain, timeAdvancement),
 
         val consumerStatus = currentState.providerState.consumerStatus
-        val runningConsumers = consumerStatus.keys().filter(chain => consumerStatus.get(chain) == RUNNING)
-        val unusedConsumers = consumerStatus.keys().filter(chain => consumerStatus.get(chain) == UNUSED)
         nondet consumersToStart = oneOf(runningConsumers.powerset())
         nondet consumersToStop = oneOf(unusedConsumers.powerset())
         nondet timeAdvancement = oneOf(timeAdvancements)
@@ -133,6 +145,89 @@ module CCVDefaultStateMachine {
         DeliverVSCPacket(recciver),
     }
 
+    // ==================
+    // INVARIANT CHECKS
+    // ==================
+
+
+    // Every validator set on any consumer chain MUST either be or have been 
+    // a validator set on the provider chain.
+    val ValidatorSetHasExistedInv =
+        ConsumerChains.forall(chain =>
+            currentState.consumerStates.get(chain).chainState.votingPowerHistory.toSet().forall(
+                validatorSet => providerValidatorHistory.toSet().contains(validatorSet)
+            )
+        )
+
+    // Any update in the power of a validator on the provider
+    // MUST be present in a ValidatorSetChangePacket that is sent to all registered consumer chains
+    val ValidatorUpdatesArePropagated =
+        // when the provider has just entered a validator set into a block...
+        if (lastAction == "EndAndBeginBlockForProvider") {
+            val providerValSetInCurBlock = providerValidatorHistory.head()
+            // ... for each consumer that is running then ...
+            runningConsumers.forall(
+                // ...the validator set is in a sent packet
+                consumer => currentState.providerState.sentVSCPackets.get(consumer).toSet().exists(
+                    packet => packet.validatorSet == providerValSetInCurBlock
+                )
+            )
+        } else {
+            true
+        }
+
+
+//     \* Invariants from https://github.com/cosmos/interchain-security/blob/main/docs/quality_assurance.md
+
+// (*
+// 6.02 - Any update in the power of a validator val on the provider, as a result of
+// - (increase) Delegate() / Redelegate() to val
+// - (increase) val joining the provider validator set
+// - (decrease) Undelegate() / Redelegate() from val
+// - (decrease) Slash(val)
+// - (decrease) val leaving the provider validator set
+// MUST be present in a ValidatorSetChangePacket that is sent to all registered consumer chains
+// *)
+// Inv602 ==
+//   \A packet \in DOMAIN votingPowerHist:
+//     \A c \in LiveConsumers:
+//       LET packetsToC == PacketOrder(c) IN
+//       \E i \in DOMAIN packetsToC:
+//         packetsToC[i] = packet
+
+// (*
+// 6.03 - Every consumer chain receives the same sequence of 
+// ValidatorSetChangePackets in the same order.
+
+// Note: consider only prefixes on received packets (ccvChannelsResolved)
+// *)
+// Inv603 == 
+//   \A c1,c2 \in LiveConsumers:
+//     \A i \in (DOMAIN ccvChannelsResolved[c1] \intersect DOMAIN ccvChannelsResolved[c2]):
+//       ccvChannelsResolved[c1][i] = ccvChannelsResolved[c2][i]
+
+// (*
+// 7.01 - For every ValidatorSetChangePacket received by a consumer chain at 
+// time t, a MaturedVSCPacket is sent back to the provider in the first block 
+// with a timestamp >= t + UnbondingPeriod
+
+// Modification: not necessarily _first_ block with that timestamp, 
+// since we don't model height _and_ time. Also, only true for ACTIVE chains.
+// *)
+// Inv701 ==
+//   boundedDrift => MaturedBeforeTimeout
+
+// (*
+// 7.02 - If an unbonding operation resulted in a ValidatorSetChangePacket sent
+// to all registered consumer chains, then it cannot complete before receiving
+// matching MaturedVSCPackets from these consumer chains 
+// (unless some of these consumer chains are removed)
+
+// We can define change completion, but we don't model it. Best approximation:
+// *)
+// Inv702 ==
+//   boundedDrift => EventuallyMatureOnProvider
+
     // ==================
     // MANUAL TEST CASES
     // ==================
@@ -221,7 +316,8 @@ module CCVDefaultStateMachine {
                     assert(currentState.providerState.receivedMaturations.size() == 1),
                     // the packet was removed from the consumer
                     assert(currentState.consumerStates.get("consumer1").outstandingPacketsToProvider.length() == 0),
-                    currentState' = currentState // just so this still has an effect
+                    currentState' = currentState, // just so this still has an effect
+                    lastAction' = "HappyPathTest"
                 }
             )
         }

From 94a0acb96b39b80f75df8082f2a0bb6dc1acd999 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 29 Sep 2023 13:25:25 +0200
Subject: [PATCH 32/80] Refactor Consumer advancement

---
 tests/difference/core/quint_model/README.md   |   4 +
 tests/difference/core/quint_model/ccv.qnt     | 115 ++++++++++++------
 .../difference/core/quint_model/ccv_test.qnt  |  10 +-
 3 files changed, 87 insertions(+), 42 deletions(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 30de96350f..24e620bf45 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -18,3 +18,7 @@ Other functions are for utility.
 
 The parameters of the protocol are defined as consts in ccv.qnt.
 
+### Invariants
+
+The invariants I am checking are in ccv_statemachine.qnt, and are as follows:
+- ValidatorUpdatesArePropagated: When a validator power update is comitted on chain, a packet containing that change in voting power is sent to all running consumers. Check via `quint run --invariant ValidatorUpdatesArePropagated ccv_statemachine.qnt --main CCVDefaultStateMachine`
\ No newline at end of file
diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 3f6a8e1982..09abd1c0ab 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -278,9 +278,8 @@ module CCV {
             val timeout = CcvTimeout.get(sender)
             if(packet.sendingTime + CcvTimeout.get(sender) < currentState.providerState.chainState.lastTimestamp) {
                 // drop consumer
-                val result = getNewConsumerStatusMap(
+                val result = stopConsumers(
                     currentState.providerState.consumerStatus,
-                    Set(),
                     Set(sender)
                 )
 
@@ -358,9 +357,8 @@ module CCV {
             // check if the consumer timed out
             if (packet.sendingTime + CcvTimeout.get(PROVIDER_CHAIN) < currentState.consumerStates.get(receiver).chainState.lastTimestamp) {
                 // drop consumer
-                val result = getNewConsumerStatusMap(
+                val result = stopConsumers(
                     currentState.providerState.consumerStatus,
-                    Set(),
                     Set(receiver)
                 )
 
@@ -428,16 +426,19 @@ module CCV {
             res._1
         )
 
-        // modify the states of the consumers that should be started/stopped
-        val res = providerStateAfterTimeAdvancement.consumerStatus.getNewConsumerStatusMap(consumersToStart, consumersToStop.union(timedOutConsumers))
+        // start/stop chains
+        val res = providerStateAfterTimeAdvancement.consumerStatus.StartStopConsumers(
+            consumersToStart,
+            consumersToStop
+        )
         val newConsumerStatus = res._1
         val err = res._2
+        val providerStateAfterConsumerAdvancement = providerStateAfterTimeAdvancement.with(
+            "consumerStatus", newConsumerStatus
+        )
         if (err != "") {
             Err(err)
         } else {
-            val providerStateAfterConsumerAdvancement = providerStateAfterTimeAdvancement.with(
-                "consumerStatus", newConsumerStatus
-            )
             val providerStateAfterSending =
             if (currentProviderState.providerValidatorSetChangedInThisBlock and 
                 // important: check this on the provider state after the consumer advancement, not on the current state.
@@ -511,43 +512,83 @@ module CCV {
         )
     }
 
-    // Returns the new ConsumerStatusMap according to the consumers to start/stop.
+    // Returns the new ConsumerStatusMap according to the consumers to stop.
     // The second return is an error string: If it is not equal to "",
     // it contains an error message, and the first return should be ignored.
-    pure def getNewConsumerStatusMap(
+    pure def stopConsumers(
         currentConsumerStatusMap: Chain -> str,
-        consumersToStart: Set[Chain],
         consumersToStop: Set[Chain]): (Chain -> str, str) = {
-            val runningConsumers = getRunningConsumersFromMap(currentConsumerStatusMap)
-            val stoppedConsumers = getStoppedConsumersFromMap(currentConsumerStatusMap)
+            val runningConsumers = currentConsumerStatusMap.keys().filter(
+                chain => currentConsumerStatusMap.get(chain) == RUNNING
+            )
             // if a consumer is both started and stopped, this is an error
-            if (consumersToStart.intersect(consumersToStop).size() > 0) {
-                (currentConsumerStatusMap, "Cannot start and stop a consumer at the same time")
-            } else {
-                // if a consumer is started, it must be unused
-                if (consumersToStart.intersect(runningConsumers).size() > 0) {
-                    (currentConsumerStatusMap, "Cannot start a consumer that is already running")
+                // if a consumer is stopped, it must be running
+                if (consumersToStop.exclude(runningConsumers).size() > 0) {
+                    (currentConsumerStatusMap, "Cannot stop a consumer that is not running")
                 } else {
-                    // if a consumer is stopped, it must be running
-                    if (consumersToStop.intersect(stoppedConsumers).size() > 0) {
-                        (currentConsumerStatusMap, "Cannot stop a consumer that is not running")
-                    } else {
-                        // if a consumer is started, it must be unused
-                        val newConsumerStatusMap = currentConsumerStatusMap.keys().mapBy(
-                            (chain) => 
-                            if (consumersToStart.contains(chain)) {
-                                RUNNING
-                            } else if (consumersToStop.contains(chain)) {
-                                STOPPED
-                            } else {
-                                currentConsumerStatusMap.get(chain)
-                            }
-                        )
-                        (newConsumerStatusMap, "")
-                    }
+                    // if a consumer is started, it must be unused
+                    val newConsumerStatusMap = currentConsumerStatusMap.keys().mapBy(
+                        (chain) => 
+                        if (consumersToStop.contains(chain)) {
+                            STOPPED
+                        } else {
+                            currentConsumerStatusMap.get(chain)
+                        }
+                    )
+                    (newConsumerStatusMap, "")
+                }
+            }
+        
+    // Returns the new ConsumerStatusMap according to the consumers to start.
+    // The second return is an error string: If it is not equal to "",
+    // it contains an error message, and the first return should be ignored.
+    pure def startConsumers(
+        currentConsumerStatusMap: Chain -> str,
+        consumersToStart: Set[Chain]): (Chain -> str, str) = {
+            val unusedConsumers = currentConsumerStatusMap.keys().filter(
+                chain => currentConsumerStatusMap.get(chain) == UNUSED
+            )
+            // if a consumer is both started and stopped, this is an error
+                // if a consumer is stopped, it must be running
+                if (consumersToStart.exclude(unusedConsumers).size() > 0) {
+                    (currentConsumerStatusMap, "cannot start a consumer that is not unused")
+                } else {
+                    // if a consumer is started, it must be unused
+                    val newConsumerStatusMap = currentConsumerStatusMap.keys().mapBy(
+                        (chain) => 
+                        if (consumersToStart.contains(chain)) {
+                            RUNNING
+                        } else {
+                            currentConsumerStatusMap.get(chain)
+                        }
+                    )
+                    (newConsumerStatusMap, "")
                 }
             }
+
+    pure def StartStopConsumers(
+        currentConsumerStatusMap: Chain -> str,
+        consumersToStart: Set[Chain],
+        consumersToStop: Set[Chain]
+    ): (Chain -> str, str) = {
+        // check if any consumer is both started and stopped
+        if (consumersToStart.intersect(consumersToStop).size() > 0) {
+            (currentConsumerStatusMap, "Cannot start and stop a consumer at the same time")
+        } else {
+            val res1 = currentConsumerStatusMap.startConsumers(consumersToStart)
+            val newConsumerStatus = res1._1
+            val err1 = res1._2
+            val res2 = newConsumerStatus.stopConsumers(consumersToStop)
+            val err2 = res2._2
+            if (err1 != "") {
+                (currentConsumerStatusMap, err1)
+            } else if (err2 != "") {
+                (currentConsumerStatusMap, err2)
+            } else {
+                (res2._1, "")
+            }
         }
+    }
 
 
     // Takes the currentValidatorSet and puts it as the newest set of the voting history
diff --git a/tests/difference/core/quint_model/ccv_test.qnt b/tests/difference/core/quint_model/ccv_test.qnt
index 31c46c0e62..d84d8f0ea4 100644
--- a/tests/difference/core/quint_model/ccv_test.qnt
+++ b/tests/difference/core/quint_model/ccv_test.qnt
@@ -167,7 +167,7 @@ module CCVTest {
             "chain2" -> RUNNING,
             "chain3" -> STOPPED
         )
-        val res = getNewConsumerStatusMap(
+        val res = StartStopConsumers(
             currentConsumerStatusMap,
             Set("chain1"),
             Set("chain2")
@@ -185,12 +185,12 @@ module CCVTest {
             "chain2" -> RUNNING,
             "chain3" -> STOPPED
         )
-        val res = getNewConsumerStatusMap(
+        val res = StartStopConsumers(
             currentConsumerStatusMap,
             Set("chain2"),
             Set("chain3")
         )
-        res._2 == "Cannot start a consumer that is already running"
+        res._2 == "cannot start a consumer that is not unused"
     }
 
     run ConsumerStatusMapAlreadyStoppedTest =
@@ -200,7 +200,7 @@ module CCVTest {
             "chain2" -> RUNNING,
             "chain3" -> STOPPED
         )
-        val res = getNewConsumerStatusMap(
+        val res = StartStopConsumers(
             currentConsumerStatusMap,
             Set("chain1"),
             Set("chain3")
@@ -215,7 +215,7 @@ module CCVTest {
             "chain2" -> RUNNING,
             "chain3" -> STOPPED
         )
-        val res = getNewConsumerStatusMap(
+        val res = StartStopConsumers(
             currentConsumerStatusMap,
             Set("chain1"),
             Set("chain1")

From 8818531faf9c27c55756053863b86e0311edff32 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 29 Sep 2023 15:12:05 +0200
Subject: [PATCH 33/80] Snapshot error

---
 tests/difference/core/quint_model/README.md   |  3 +-
 tests/difference/core/quint_model/ccv.qnt     |  8 +++
 .../core/quint_model/ccv_statemachine.qnt     | 44 ++++++++++-------
 .../quint_model/libraries/extraSpells.qnt     | 49 +++++++++++++++++++
 4 files changed, 86 insertions(+), 18 deletions(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 24e620bf45..910cbe7232 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -21,4 +21,5 @@ The parameters of the protocol are defined as consts in ccv.qnt.
 ### Invariants
 
 The invariants I am checking are in ccv_statemachine.qnt, and are as follows:
-- ValidatorUpdatesArePropagated: When a validator power update is comitted on chain, a packet containing that change in voting power is sent to all running consumers. Check via `quint run --invariant ValidatorUpdatesArePropagated ccv_statemachine.qnt --main CCVDefaultStateMachine`
\ No newline at end of file
+- ValidatorUpdatesArePropagated: When a validator power update is comitted on chain, a packet containing that change in voting power is sent to all running consumers. Check via `quint run --invariant ValidatorUpdatesArePropagated ccv_statemachine.qnt --main CCVDefaultStateMachine`
+- 
\ No newline at end of file
diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 09abd1c0ab..72a0e0d933 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -106,6 +106,10 @@ module CCVTypes {
         // Stores the maturation times for VSCPackets received by this consumer
         maturationTimes: VSCPacket -> Time,
 
+        // stores the received vscpackets in descending order of recency,
+        // i.e. newest first.
+        receivedVSCPackets: List[VSCPacket],
+
         // Stores the list of packets that have been sent to the provider chain by this consumer
         // and have not been received yet.
         // ordered by recency, so the head is the oldest packet.
@@ -119,6 +123,7 @@ module CCVTypes {
             chainState: GetEmptyChainState,
             maturationTimes: Map(),
             outstandingPacketsToProvider: List(),
+            receivedVSCPackets: List(),
         }
 
     // the state of the protocol consists of the composition of the state of one provider chain with potentially many consumer chains.
@@ -681,6 +686,9 @@ module CCV {
                     packet, 
                     currentConsumerState.chainState.lastTimestamp + UnbondingPeriodPerChain.get(receiver)
                 )
+            ).with(
+                "receivedVSCPackets",
+                currentConsumerState.receivedVSCPackets.prepend(packet)
             )
             val newConsumerStates = currentState.consumerStates.set(receiver, newConsumerState)
             val newState = currentState.with(
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index 024731e446..8f3b918f22 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -153,7 +153,7 @@ module CCVDefaultStateMachine {
     // Every validator set on any consumer chain MUST either be or have been 
     // a validator set on the provider chain.
     val ValidatorSetHasExistedInv =
-        ConsumerChains.forall(chain =>
+        runningConsumers.forall(chain =>
             currentState.consumerStates.get(chain).chainState.votingPowerHistory.toSet().forall(
                 validatorSet => providerValidatorHistory.toSet().contains(validatorSet)
             )
@@ -176,24 +176,34 @@ module CCVDefaultStateMachine {
             true
         }
 
+    // Every consumer chain receives the same sequence of 
+    // ValidatorSetChangePackets in the same order.
+    // NOTE: since not all consumer chains are running all the time,
+    // we need a slightly weaker invariant:
+    // For consumer chains c1, c2, if both c1 and c2 received a packet p1 sent at t1 and a packet p2 sent at t2,
+    // then both have received ALL packets that were sent between t1 and t2.
+    val SameVSCPacketsInv =
+        runningConsumers.forall(
+            consumer1 => runningConsumers.forall(
+                consumer2 => {
+                    val packets1 = currentState.consumerStates.get(consumer1).receivedVSCPackets
+                    val packets2 = currentState.consumerStates.get(consumer2).receivedVSCPackets
+                    val commonPackets = packets1.toSet().intersect(packets2.toSet())
+                    if (commonPackets.size() == 0) {
+                        true // they don't share any packets, so nothing to check
+                    } else {
+                        // get oldest common packet
+                        val oldestCommonPacket = commonPackets.MinBy(packet => packet.sendingTime, packets1.head())
+                        false
+                    }
+                }
+            )
+        )
 
-//     \* Invariants from https://github.com/cosmos/interchain-security/blob/main/docs/quality_assurance.md
+        
 
-// (*
-// 6.02 - Any update in the power of a validator val on the provider, as a result of
-// - (increase) Delegate() / Redelegate() to val
-// - (increase) val joining the provider validator set
-// - (decrease) Undelegate() / Redelegate() from val
-// - (decrease) Slash(val)
-// - (decrease) val leaving the provider validator set
-// MUST be present in a ValidatorSetChangePacket that is sent to all registered consumer chains
-// *)
-// Inv602 ==
-//   \A packet \in DOMAIN votingPowerHist:
-//     \A c \in LiveConsumers:
-//       LET packetsToC == PacketOrder(c) IN
-//       \E i \in DOMAIN packetsToC:
-//         packetsToC[i] = packet
+
+//     \* Invariants from https://github.com/cosmos/interchain-security/blob/main/docs/quality_assurance.md
 
 // (*
 // 6.03 - Every consumer chain receives the same sequence of 
diff --git a/tests/difference/core/quint_model/libraries/extraSpells.qnt b/tests/difference/core/quint_model/libraries/extraSpells.qnt
index 1d7d219640..54b5feca09 100644
--- a/tests/difference/core/quint_model/libraries/extraSpells.qnt
+++ b/tests/difference/core/quint_model/libraries/extraSpells.qnt
@@ -194,4 +194,53 @@ module extraSpells {
         assert(Max(Set(1, 2, 3)) == 3),
         assert(Max(Set()) == 0)
     }
+
+    pure def HasSubsequence(__this: List[a], __other: List[a]): bool = {
+      if(__other.length() > __this.length()) {
+        false
+      } else {
+        0.to(__this.length() - __other.length()) // go through all possible starting points of __other in __this
+        .exists(
+          __start => __this.slice(__start, __start + __other.length()) == __other
+        )
+      }
+    }
+
+    run HasSubsequenceTest =
+    all {
+      assert(List(1, 2, 3, 4).HasSubsequence(List(1, 2))),
+      assert(List(1, 2, 3, 4).HasSubsequence(List(2, 3))),
+      assert(List(1, 2, 3, 4).HasSubsequence(List(3, 4))),
+      assert(List(1, 2, 3, 4).HasSubsequence(List(1, 2, 3))),
+      assert(not(List(1, 2, 3, 4).HasSubsequence(List(1, 3)))),
+      assert(not(List().HasSubsequence(List(1)))),
+      assert(List().HasSubsequence(List())),
+      assert(List(1).HasSubsequence(List())),
+      assert(List(1).HasSubsequence(List(1))),
+    }
+
+    // Returns the maximum element of a set, according to a given function.
+    // __i should be part of the set if it is nonempty. If the set is empty, __i will be returned.
+    // If two elements are equally large, an arbitrary one will be returned.
+    pure def MaxBy(__set: Set[a], __f: a => int, __i: a): a = {
+      __set.fold(
+        __i,
+        (__m, __e) => if(__f(__m) > __f(__e)) {__m } else {__e}
+      )
+    }
+
+    run MaxByTest =
+    all {
+      assert(MaxBy(Set(1, 2, 3), __x => __x, 0) == 3),
+      assert(MaxBy(Set(1, 2, 3), __x => -__x, 0) == 1),
+      assert(MaxBy(Set(), __x => __x, 0) == 0),
+    }
+
+    // Like MaxBy, but returns the minimum element.
+    pure def MinBy(__set: Set[a], __f: a => int, __i: a): a = {
+      __set.fold(
+        __i,
+        (__m, __e) => if(__f(__m) < __f(__e)) {__m } else {__e}
+      )
+    }
 }

From 633f8bb3ff005b26eb1f22df52112a5c0a28e48a Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 29 Sep 2023 15:33:35 +0200
Subject: [PATCH 34/80] Make time module upper case

---
 .../core/quint_model/ccv_statemachine.qnt     | 28 ++++++++-----------
 .../libraries/{time.qnt => Time.qnt}          |  0
 2 files changed, 12 insertions(+), 16 deletions(-)
 rename tests/difference/core/quint_model/libraries/{time.qnt => Time.qnt} (100%)

diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index 8f3b918f22..b8ad1a82f3 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -192,30 +192,26 @@ module CCVDefaultStateMachine {
                     if (commonPackets.size() == 0) {
                         true // they don't share any packets, so nothing to check
                     } else {
-                        // get oldest common packet
-                        val oldestCommonPacket = commonPackets.MinBy(packet => packet.sendingTime, packets1.head())
-                        false
+                        val oldestCommonPacket = packets1.head()
+                        val newestCommonPacket = packets1[packets1.length() - 1]
+                        // get all packets sent between the oldest and newest common packet
+                        val packetsBetween1 = packets1.select(
+                            packet => packet.sendingTime >= oldestCommonPacket.sendingTime and packet.sendingTime <= newestCommonPacket.sendingTime
+                        )
+                        val packetsBetween2 = packets2.select(
+                            packet => packet.sendingTime >= oldestCommonPacket.sendingTime and packet.sendingTime <= newestCommonPacket.sendingTime
+                        )
+                        // these should be the same on both chains
+                        packetsBetween1 == packetsBetween2
                     }
                 }
             )
         )
 
-        
-
+    // val MaturedBeforeTimeoutInv =
 
 //     \* Invariants from https://github.com/cosmos/interchain-security/blob/main/docs/quality_assurance.md
 
-// (*
-// 6.03 - Every consumer chain receives the same sequence of 
-// ValidatorSetChangePackets in the same order.
-
-// Note: consider only prefixes on received packets (ccvChannelsResolved)
-// *)
-// Inv603 == 
-//   \A c1,c2 \in LiveConsumers:
-//     \A i \in (DOMAIN ccvChannelsResolved[c1] \intersect DOMAIN ccvChannelsResolved[c2]):
-//       ccvChannelsResolved[c1][i] = ccvChannelsResolved[c2][i]
-
 // (*
 // 7.01 - For every ValidatorSetChangePacket received by a consumer chain at 
 // time t, a MaturedVSCPacket is sent back to the provider in the first block 
diff --git a/tests/difference/core/quint_model/libraries/time.qnt b/tests/difference/core/quint_model/libraries/Time.qnt
similarity index 100%
rename from tests/difference/core/quint_model/libraries/time.qnt
rename to tests/difference/core/quint_model/libraries/Time.qnt

From f28d074ce70ebc9c37c08d34388f8ffbb9abcc59 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 29 Sep 2023 16:05:32 +0200
Subject: [PATCH 35/80] Add invariants

---
 tests/difference/core/quint_model/README.md   | 18 ++++++++--
 .../core/quint_model/ccv_statemachine.qnt     | 36 ++++++++++++++++++-
 2 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 910cbe7232..6d1ad8d2be 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -20,6 +20,18 @@ The parameters of the protocol are defined as consts in ccv.qnt.
 
 ### Invariants
 
-The invariants I am checking are in ccv_statemachine.qnt, and are as follows:
-- ValidatorUpdatesArePropagated: When a validator power update is comitted on chain, a packet containing that change in voting power is sent to all running consumers. Check via `quint run --invariant ValidatorUpdatesArePropagated ccv_statemachine.qnt --main CCVDefaultStateMachine`
-- 
\ No newline at end of file
+The invariants I am checking are in ccv_statemachine.qnt.
+Check a single invariant by running
+`quint run --invariant INVARIANT_NAME ccv_statemachine.qnt --main CCVDefaultStateMachine`,
+or all invariants by running this command:
+
+Invariants are as follows:
+- ValidatorUpdatesArePropagated: When a validator power update is comitted on chain, a packet containing that change in voting power is sent to all running consumers.
+- ValidatorSetHasExistedInv: Every validator set on consumer chains is/was a validator set on the provider.
+- SameVSCPacketsInv: Ensure that consumer chains receive the same VSCPackets in the same order.
+Because of nuances with starting/stopping consumers, this invariant is not as simple as it sounds. In detail:
+For consumer chains c1, c2, if both c1 and c2 received a packet p1 sent at t1 and a packet p2 sent at t2,
+then both have received ALL packets that were sent between t1 and t2 in the same order.
+- MatureOnTimeInv: For every ValidatorSetChangePacket received by a consumer chain at 
+time t, a MaturedVSCPacket is sent back to the provider in the first block 
+with a timestamp >= t + UnbondingPeriod on that consumer.
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index b8ad1a82f3..4a6ac2e558 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -208,7 +208,41 @@ module CCVDefaultStateMachine {
             )
         )
 
-    // val MaturedBeforeTimeoutInv =
+    // For every ValidatorSetChangePacket received by a consumer chain at 
+    // time t, a MaturedVSCPacket is sent back to the provider in the first block 
+    // with a timestamp >= t + UnbondingPeriod
+    // NOTE: because we remove the maturationTimes entry when we send the packets,
+    // it suffices to check that there is never an entry in maturationTimes
+    // that is older than the current time minus the unbonding period.
+    val MatureOnTimeInv =
+        runningConsumers.forall(
+            consumer => {
+                val maturationTimes = currentState.consumerStates.get(consumer).maturationTimes
+                maturationTimes.keys().forall(
+                    packet => packet.sendingTime + UnbondingPeriodPerChain.get(consumer) <= currentState.providerState.chainState.lastTimestamp
+                )
+            }
+        )
+
+    // If we send a VSCPacket, this is eventually responded to by all consumers
+    // that were running at the time the packet was sent (and are still running).
+    // Since we remove sentVSCPackets when we receive responses for them,
+    // we just check that if a sentVSCPacket has been sent more than
+    // VSCTimeout ago, the consumer must have been dropped.
+    // In practice, when this is true, a pending unbonding can mature.
+    val EventuallyMatureOnProviderInv =
+        runningConsumers.forall(
+            consumer => {
+                val sentPackets = currentState.providerState.sentVSCPackets.get(consumer).toSet()
+                sentPackets.forall(
+                    packet =>
+                        // consumer still has time to respond
+                        currentState.providerState.chainState.lastTimestamp <= packet.sendingTime + VscTimeout or
+                        // consumer was dropped due to inactivity
+                        currentState.providerState.consumerStatus.get(consumer) == STOPPED
+                )
+            }
+        )
 
 //     \* Invariants from https://github.com/cosmos/interchain-security/blob/main/docs/quality_assurance.md
 

From c0363f21d2115a03676e5fef3be3ab5860d9b300 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 29 Sep 2023 16:07:29 +0200
Subject: [PATCH 36/80] Clean up invariants

---
 tests/difference/core/quint_model/README.md   |  2 ++
 .../core/quint_model/ccv_statemachine.qnt     | 24 -------------------
 2 files changed, 2 insertions(+), 24 deletions(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 6d1ad8d2be..2d5b57d0fc 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -35,3 +35,5 @@ then both have received ALL packets that were sent between t1 and t2 in the same
 - MatureOnTimeInv: For every ValidatorSetChangePacket received by a consumer chain at 
 time t, a MaturedVSCPacket is sent back to the provider in the first block 
 with a timestamp >= t + UnbondingPeriod on that consumer.
+- EventuallyMatureOnProviderInv: If we send a VSCPacket, this is eventually responded to by all consumers
+that were running at the time the packet was sent (and are still running).
\ No newline at end of file
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index 4a6ac2e558..60f9d77152 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -244,30 +244,6 @@ module CCVDefaultStateMachine {
             }
         )
 
-//     \* Invariants from https://github.com/cosmos/interchain-security/blob/main/docs/quality_assurance.md
-
-// (*
-// 7.01 - For every ValidatorSetChangePacket received by a consumer chain at 
-// time t, a MaturedVSCPacket is sent back to the provider in the first block 
-// with a timestamp >= t + UnbondingPeriod
-
-// Modification: not necessarily _first_ block with that timestamp, 
-// since we don't model height _and_ time. Also, only true for ACTIVE chains.
-// *)
-// Inv701 ==
-//   boundedDrift => MaturedBeforeTimeout
-
-// (*
-// 7.02 - If an unbonding operation resulted in a ValidatorSetChangePacket sent
-// to all registered consumer chains, then it cannot complete before receiving
-// matching MaturedVSCPackets from these consumer chains 
-// (unless some of these consumer chains are removed)
-
-// We can define change completion, but we don't model it. Best approximation:
-// *)
-// Inv702 ==
-//   boundedDrift => EventuallyMatureOnProvider
-
     // ==================
     // MANUAL TEST CASES
     // ==================

From b9d8caf82511b0ac878883f008c2ed00c474361f Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 29 Sep 2023 16:14:21 +0200
Subject: [PATCH 37/80] Add script to run many invariants

---
 tests/difference/core/quint_model/README.md         | 3 ++-
 tests/difference/core/quint_model/run_invariants.sh | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)
 create mode 100755 tests/difference/core/quint_model/run_invariants.sh

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 2d5b57d0fc..228c791349 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -23,7 +23,8 @@ The parameters of the protocol are defined as consts in ccv.qnt.
 The invariants I am checking are in ccv_statemachine.qnt.
 Check a single invariant by running
 `quint run --invariant INVARIANT_NAME ccv_statemachine.qnt --main CCVDefaultStateMachine`,
-or all invariants by running this command:
+or all invariants one after another with the help of the script `run_invariants.sh`.
+Each invariant takes about a minute to run.
 
 Invariants are as follows:
 - ValidatorUpdatesArePropagated: When a validator power update is comitted on chain, a packet containing that change in voting power is sent to all running consumers.
diff --git a/tests/difference/core/quint_model/run_invariants.sh b/tests/difference/core/quint_model/run_invariants.sh
new file mode 100755
index 0000000000..575b444e28
--- /dev/null
+++ b/tests/difference/core/quint_model/run_invariants.sh
@@ -0,0 +1,5 @@
+quint run --invariant ValidatorUpdatesArePropagated ccv_statemachine.qnt --main CCVDefaultStateMachine
+quint run --invariant ValidatorSetHasExistedInv ccv_statemachine.qnt --main CCVDefaultStateMachine
+quint run --invariant SameVSCPacketsInv ccv_statemachine.qnt --main CCVDefaultStateMachine
+quint run --invariant MatureOnTimeInv ccv_statemachine.qnt --main CCVDefaultStateMachine
+quint run --invariant EventuallyMatureOnProviderInv ccv_statemachine.qnt --main CCVDefaultStateMachine
\ No newline at end of file

From e494a094ce629537303e6673bcd374fcc31fafc0 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Mon, 2 Oct 2023 10:19:19 +0200
Subject: [PATCH 38/80] Update model

---
 tests/difference/core/quint_model/README.md   | 32 ++++--
 tests/difference/core/quint_model/ccv.qnt     | 48 ++++++---
 .../core/quint_model/ccv_statemachine.qnt     | 97 +++++++++++++------
 .../difference/core/quint_model/ccv_test.qnt  | 14 ++-
 .../quint_model/libraries/extraSpells.qnt     | 27 ++++--
 .../core/quint_model/run_invariants.sh        |  6 +-
 6 files changed, 160 insertions(+), 64 deletions(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 228c791349..a6451b1396 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -18,6 +18,10 @@ Other functions are for utility.
 
 The parameters of the protocol are defined as consts in ccv.qnt.
 
+### Tests
+
+To run unit tests, run `quint test ccv_test.qnt`.
+
 ### Invariants
 
 The invariants I am checking are in ccv_statemachine.qnt.
@@ -27,14 +31,30 @@ or all invariants one after another with the help of the script `run_invariants.
 Each invariant takes about a minute to run.
 
 Invariants are as follows:
-- ValidatorUpdatesArePropagated: When a validator power update is comitted on chain, a packet containing that change in voting power is sent to all running consumers.
-- ValidatorSetHasExistedInv: Every validator set on consumer chains is/was a validator set on the provider.
-- SameVSCPacketsInv: Ensure that consumer chains receive the same VSCPackets in the same order.
+- [ ] ValidatorUpdatesArePropagated: When a validator power update is comitted on chain, a packet containing that change in voting power is sent to all running consumers.
+- [ ] ValidatorSetHasExistedInv: Every validator set on consumer chains is/was a validator set on the provider.
+- [ ] SameVSCPacketsInv: Ensure that consumer chains receive the same VSCPackets in the same order.
 Because of nuances with starting/stopping consumers, this invariant is not as simple as it sounds. In detail:
 For consumer chains c1, c2, if both c1 and c2 received a packet p1 sent at t1 and a packet p2 sent at t2,
 then both have received ALL packets that were sent between t1 and t2 in the same order.
-- MatureOnTimeInv: For every ValidatorSetChangePacket received by a consumer chain at 
+- [ ] MatureOnTimeInv: For every ValidatorSetChangePacket received by a consumer chain at 
 time t, a MaturedVSCPacket is sent back to the provider in the first block 
 with a timestamp >= t + UnbondingPeriod on that consumer.
-- EventuallyMatureOnProviderInv: If we send a VSCPacket, this is eventually responded to by all consumers
-that were running at the time the packet was sent (and are still running).
\ No newline at end of file
+- [ ] EventuallyMatureOnProviderInv: If we send a VSCPacket, this is eventually responded to by all consumers
+that were running at the time the packet was sent (and are still running).
+
+### Sanity Checks
+
+Sanity checks verify that certain patterns of behaviour can appear in the model.
+In detail, they are invariant checks that we expect to fail.
+They usually negate the appearance of some behaviour, i.e. not(DesirableBehaviour).
+Then, a counterexample for this is an example trace exhibiting the behaviour.
+
+They are run like invariant checks, i.e. `quint run --invariant SANITY_CHECK_NAME ccv_statemachine.qnt --main CCVDefaultStateMachine`.
+The available sanity checks are:
+- CanRunConsumer
+- CanStopConsumer
+- CanTimeoutConsumer
+- CanSendVSCPackets
+- CanSendVSCMaturedPackets
+        
\ No newline at end of file
diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 72a0e0d933..f329955955 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -191,7 +191,8 @@ module CCVTypes {
     }
 
     // possible consumer statuses
-    pure val STOPPED = "stopped" // the chain was once a consumer chain, but has been dropped by the provider.
+    pure val STOPPED = "stopped" // the chain was once a consumer chain, but has been voluntarily dropped by the provider.
+    pure val TIMEDOUT = "timedout" // the chain has timed out and was dropped by the provider. This is only used for involuntary drops.
     pure val RUNNING = "running" // the chain is currently a consumer chain. Running chains are those that get sent VSCPackets.
     pure val UNUSED = "unused" // the chain has never been a consumer chain, and is available to become one.
     // When a chain is dropped, it cannot become a consumer again - we assume that would be done by another consumer becoming running.
@@ -285,6 +286,7 @@ module CCV {
                 // drop consumer
                 val result = stopConsumers(
                     currentState.providerState.consumerStatus,
+                    Set(),
                     Set(sender)
                 )
 
@@ -364,6 +366,7 @@ module CCV {
                 // drop consumer
                 val result = stopConsumers(
                     currentState.providerState.consumerStatus,
+                    Set(),
                     Set(receiver)
                 )
 
@@ -434,7 +437,8 @@ module CCV {
         // start/stop chains
         val res = providerStateAfterTimeAdvancement.consumerStatus.StartStopConsumers(
             consumersToStart,
-            consumersToStop
+            consumersToStop,
+            timedOutConsumers
         )
         val newConsumerStatus = res._1
         val err = res._2
@@ -505,6 +509,17 @@ module CCV {
     // which do not hold the core logic of the protocol, but are still part of it
     // ===================
 
+    // Get the running consumer that is furthest away from the provider in terms of timestamp.
+    pure def getFurthestConsumer(currentState: ProtocolState): Chain = {
+        val furthestConsumer = getRunningConsumers(currentState.providerState).MaxBy(
+            consumer => abs(
+                currentState.providerState.chainState.lastTimestamp -
+                currentState.consumerStates.get(consumer).chainState.lastTimestamp
+            )
+        )
+        furthestConsumer
+    }
+
     pure def getRunningConsumersFromMap(consumerStatus: Chain -> str): Set[Chain] = {
         consumerStatus.keys().filter(
             chain => consumerStatus.get(chain) == RUNNING
@@ -517,12 +532,15 @@ module CCV {
         )
     }
 
-    // Returns the new ConsumerStatusMap according to the consumers to stop.
+    // Returns the new ConsumerStatusMap according to the consumers to stop
+    // and the consumers to time out.
+    // If a consumer is both stopped and timed out, it will be timed out.
     // The second return is an error string: If it is not equal to "",
     // it contains an error message, and the first return should be ignored.
     pure def stopConsumers(
         currentConsumerStatusMap: Chain -> str,
-        consumersToStop: Set[Chain]): (Chain -> str, str) = {
+        consumersToStop: Set[Chain],
+        consumersToTimeout: Set[Chain]): (Chain -> str, str) = {
             val runningConsumers = currentConsumerStatusMap.keys().filter(
                 chain => currentConsumerStatusMap.get(chain) == RUNNING
             )
@@ -534,7 +552,9 @@ module CCV {
                     // if a consumer is started, it must be unused
                     val newConsumerStatusMap = currentConsumerStatusMap.keys().mapBy(
                         (chain) => 
-                        if (consumersToStop.contains(chain)) {
+                        if (consumersToTimeout.contains(chain)) {
+                            TIMEDOUT
+                        } else if (consumersToStop.contains(chain)) {
                             STOPPED
                         } else {
                             currentConsumerStatusMap.get(chain)
@@ -574,7 +594,8 @@ module CCV {
     pure def StartStopConsumers(
         currentConsumerStatusMap: Chain -> str,
         consumersToStart: Set[Chain],
-        consumersToStop: Set[Chain]
+        consumersToStop: Set[Chain],
+        consumersToTimeout: Set[Chain]
     ): (Chain -> str, str) = {
         // check if any consumer is both started and stopped
         if (consumersToStart.intersect(consumersToStop).size() > 0) {
@@ -583,7 +604,7 @@ module CCV {
             val res1 = currentConsumerStatusMap.startConsumers(consumersToStart)
             val newConsumerStatus = res1._1
             val err1 = res1._2
-            val res2 = newConsumerStatus.stopConsumers(consumersToStop)
+            val res2 = newConsumerStatus.stopConsumers(consumersToStop, consumersToTimeout)
             val err2 = res2._2
             if (err1 != "") {
                 (currentConsumerStatusMap, err1)
@@ -808,11 +829,16 @@ module CCV {
 
             // has a packet been sent on the provider more than VSCTimeout ago, but we have not received an answer since then?
             val sentVSCPackets = providerState.sentVSCPackets.get(consumer)
-            val oldestSentVSCPacket = sentVSCPackets.head() // if length is 0, this is undefined, but we check for this before we use it
-            if(sentVSCPackets.length() > 0 and oldestSentVSCPacket.sendingTime + VscTimeout < providerState.chainState.lastTimestamp) {
-                (true, "")
+            if(sentVSCPackets.length() > 0) {
+                val oldestSentVSCPacket = sentVSCPackets.head() // if length is 0, this is undefined, but we check for this before we use it
+                if(oldestSentVSCPacket.sendingTime + VscTimeout < providerState.chainState.lastTimestamp) {
+                    (true, "")
+                } else {
+                    // no timeout yet, it has not been VscTimeout since that packet was sent
+                    (false, "")
+                }
             } else {
-                // no timeout yet, it has not been VscTimeout since that packet was sent
+                // no packet has been sent yet, so no timeout
                 (false, "")
             }
         }
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index 60f9d77152..a0e81a5186 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -18,7 +18,7 @@ module CCVDefaultStateMachine {
     var currentState: ProtocolState
     
     // bookkeeping
-    var lastAction: str
+    var trace: List[str]
 
     // some utility stateful vals to make invariants easier to define
     val providerValidatorHistory = currentState.providerState.chainState.votingPowerHistory
@@ -49,7 +49,7 @@ module CCVDefaultStateMachine {
             providerState: providerStateWithConsumers,
             consumerStates: consumerStates
         },
-        lastAction' = "init"
+        trace' = List("init")
     }
 
     action VotingPowerChange(validator: Node, newVotingPower: int): bool = 
@@ -57,7 +57,7 @@ module CCVDefaultStateMachine {
         all {
             result.hasError == false,
             currentState' = result.newState,
-            lastAction' = "VotingPowerChange"
+            trace' = trace.append("VotingPowerChange")
         }
 
     // The receiver receives the next outstanding VSCPacket from the provider.
@@ -68,7 +68,7 @@ module CCVDefaultStateMachine {
         all {
             result.hasError == false,
             currentState' = result.newState,
-            lastAction' = "DeliverVSCPacket"
+            trace' = trace.append("DeliverVSCPacket")
         }
 
     // The provider receives the next outstanding VSCMaturedPacket from the sender.
@@ -79,7 +79,7 @@ module CCVDefaultStateMachine {
         all {
             result.hasError == false,
             currentState' = result.newState,
-            lastAction' = "DeliverVSCMaturedPacket"
+            trace' = trace.append("DeliverVSCMaturedPacket")
         }
 
     action EndAndBeginBlockForProvider(
@@ -90,7 +90,7 @@ module CCVDefaultStateMachine {
         all {
             result.hasError == false,
             currentState' = result.newState,
-            lastAction' = "EndAndBeginBlockForProvider"
+            trace' = trace.append("EndAndBeginBlockForProvider")
         }
 
     action EndAndBeginBlockForConsumer(
@@ -100,7 +100,7 @@ module CCVDefaultStateMachine {
         all {
             result.hasError == false,
             currentState' = result.newState,
-            lastAction' = "EndAndBeginBlockForConsumer"
+            trace' = trace.append("EndAndBeginBlockForConsumer")
         }
 
     // a few different values for time advancements.
@@ -110,38 +110,36 @@ module CCVDefaultStateMachine {
     // Note that these can still be combined, so in effect we can get all time advancements by any amount of seconds.
     pure val timeAdvancements = Set(1 * Second, 1 * Day, 1 * Week, 4 * Week)
 
+    // step allows the most generic nondeterminism, in particular it becomes relatively likely
+    // that over a long enough runtime, all consumers would time out by mismatching their time advancements,
+    // and each endblock has a good chance to stop consumers, ...
+    // step is thus suited to test also unhappy paths.
     action step = any {
-        nondet node = oneOf(nodes)
-        // very restricted set of voting powers. exact values are not important,
-        // and this keeps the state space smaller.
-        // 0 for getting a validator out of the validator set, and two non-zero values
-        nondet newVotingPower = oneOf(Set(0, 50, 100))
-        VotingPowerChange(node, newVotingPower),
-
-        nondet chain = oneOf(consumerChains)
-        // a few different values for time advancements.
-        // to keep the number of possible steps small, we only have a few different values.
-        // Roughly, 1s for very small advances (like between blocks),
-        // and then longer values for increasingly severe downtime scenarios.
-        // Note that these can still be combined, so in effect we can get all time advancements by any amount of seconds.
+        nondet chain = oneOf(runningConsumers)
         nondet timeAdvancement = oneOf(timeAdvancements)
         EndAndBeginBlockForConsumer(chain, timeAdvancement),
 
         val consumerStatus = currentState.providerState.consumerStatus
-        nondet consumersToStart = oneOf(runningConsumers.powerset())
-        nondet consumersToStop = oneOf(unusedConsumers.powerset())
+        nondet consumersToStart = oneOf(unusedConsumers.powerset())
+        nondet consumersToStop = oneOf(runningConsumers.powerset())
         nondet timeAdvancement = oneOf(timeAdvancements)
         EndAndBeginBlockForProvider(timeAdvancement, consumersToStart, consumersToStop),
 
-        // 
+        nondet node = oneOf(nodes)
+        // very restricted set of voting powers. exact values are not important,
+        // and this keeps the state space smaller.
+        // 0 for getting a validator out of the validator set, and two non-zero values
+        nondet newVotingPower = oneOf(Set(0, 50, 100))
+        VotingPowerChange(node, newVotingPower),
+
         // try to send a packet. we could filter by chains that can actually send,
         // but it's probably not much faster than just trying and failing.
-        nondet sender = oneOf(consumerChains)
+        nondet sender = oneOf(runningConsumers)
         DeliverVSCMaturedPacket(sender),
 
         // again, we could filter by chains that can actually receive,
         // but it's probably not much faster than just trying and failing.
-        nondet recciver = oneOf(consumerChains)
+        nondet recciver = oneOf(runningConsumers)
         DeliverVSCPacket(recciver),
     }
 
@@ -163,7 +161,7 @@ module CCVDefaultStateMachine {
     // MUST be present in a ValidatorSetChangePacket that is sent to all registered consumer chains
     val ValidatorUpdatesArePropagated =
         // when the provider has just entered a validator set into a block...
-        if (lastAction == "EndAndBeginBlockForProvider") {
+        if (trace == trace.append("EndAndBeginBlockForProvider")) {
             val providerValSetInCurBlock = providerValidatorHistory.head()
             // ... for each consumer that is running then ...
             runningConsumers.forall(
@@ -238,12 +236,53 @@ module CCVDefaultStateMachine {
                     packet =>
                         // consumer still has time to respond
                         currentState.providerState.chainState.lastTimestamp <= packet.sendingTime + VscTimeout or
-                        // consumer was dropped due to inactivity
-                        currentState.providerState.consumerStatus.get(consumer) == STOPPED
+                        // consumer was dropped
+                        currentState.providerState.consumerStatus.get(consumer) == STOPPED or
+                        currentState.providerState.consumerStatus.get(consumer) == TIMEDOUT
                 )
             }
         )
 
+    // =================
+    // SANITY CHECKS
+    // =================
+    // some invariants that should fail,
+    // to check that certain behaviours can be exhibited.
+    // The name of the invariants is the name of the behaviour
+    // we want to see, and its definition will *negate* that behaviour, so
+    // we expect these to fail when checked as invariants.
+
+     // We can run consumers.
+     val CanRunConsumer =
+        not(ConsumerChains.exists(
+            consumer => 
+                currentState.providerState.consumerStatus.get(consumer) == RUNNING
+        ))
+
+    val CanStopConsumer =
+        not(ConsumerChains.exists(
+            consumer => 
+                currentState.providerState.consumerStatus.get(consumer) == STOPPED
+        ))
+
+    val CanTimeoutConsumer =
+        not(ConsumerChains.exists(
+            consumer => 
+                currentState.providerState.consumerStatus.get(consumer) == TIMEDOUT
+        ))
+
+    val CanSendVSCPackets =
+        not(ConsumerChains.exists(
+            consumer => 
+                currentState.providerState.outstandingPacketsToConsumer.get(consumer).length() > 0
+        ))
+
+    val CanSendVSCMaturedPackets =
+        not(ConsumerChains.exists(
+            consumer => 
+                currentState.consumerStates.get(consumer).outstandingPacketsToProvider.length() > 0
+        ))
+
     // ==================
     // MANUAL TEST CASES
     // ==================
@@ -333,7 +372,7 @@ module CCVDefaultStateMachine {
                     // the packet was removed from the consumer
                     assert(currentState.consumerStates.get("consumer1").outstandingPacketsToProvider.length() == 0),
                     currentState' = currentState, // just so this still has an effect
-                    lastAction' = "HappyPathTest"
+                    trace' = trace.append("HappyPathTest")
                 }
             )
         }
diff --git a/tests/difference/core/quint_model/ccv_test.qnt b/tests/difference/core/quint_model/ccv_test.qnt
index d84d8f0ea4..d416c0508e 100644
--- a/tests/difference/core/quint_model/ccv_test.qnt
+++ b/tests/difference/core/quint_model/ccv_test.qnt
@@ -157,7 +157,7 @@ module CCVTest {
         val newConsumerState = result.newState.consumerStates.get("sender")
         not(result.hasError) and
         newProviderState.receivedMaturations.size() == 0 and
-        newProviderState.consumerStatus.get("sender") == STOPPED
+        newProviderState.consumerStatus.get("sender") == TIMEDOUT
     }
 
     run ConsumerStatusMapHappyPathTest = 
@@ -170,7 +170,8 @@ module CCVTest {
         val res = StartStopConsumers(
             currentConsumerStatusMap,
             Set("chain1"),
-            Set("chain2")
+            Set("chain2"),
+            Set()
         )
         res._2 == "" and
         res._1.get("chain1") == RUNNING and
@@ -188,7 +189,8 @@ module CCVTest {
         val res = StartStopConsumers(
             currentConsumerStatusMap,
             Set("chain2"),
-            Set("chain3")
+            Set("chain3"),
+            Set()
         )
         res._2 == "cannot start a consumer that is not unused"
     }
@@ -203,7 +205,8 @@ module CCVTest {
         val res = StartStopConsumers(
             currentConsumerStatusMap,
             Set("chain1"),
-            Set("chain3")
+            Set("chain3"),
+            Set()
         )
         res._2 == "Cannot stop a consumer that is not running"
     }
@@ -218,7 +221,8 @@ module CCVTest {
         val res = StartStopConsumers(
             currentConsumerStatusMap,
             Set("chain1"),
-            Set("chain1")
+            Set("chain1"),
+            Set()
         )
         res._2 == "Cannot start and stop a consumer at the same time"
     }
diff --git a/tests/difference/core/quint_model/libraries/extraSpells.qnt b/tests/difference/core/quint_model/libraries/extraSpells.qnt
index 54b5feca09..9c1fb4034d 100644
--- a/tests/difference/core/quint_model/libraries/extraSpells.qnt
+++ b/tests/difference/core/quint_model/libraries/extraSpells.qnt
@@ -185,14 +185,26 @@ module extraSpells {
         assert(Values(Map()) == Set())
     }
 
+    // Returns the maximal element of the set.
+    // If the set is empty, the function call will fail at runtime.
     pure def Max(__set: Set[int]): int = {
-        __set.fold(0, (__m, __e) => max(__m, __e))
+        __set.fold(oneOf(__set), (__m, __e) => max(__m, __e))
     }
 
     run MaxTest =
     all {
         assert(Max(Set(1, 2, 3)) == 3),
-        assert(Max(Set()) == 0)
+    }
+
+    // Returns the minimal element of the set.
+    // If the set is empty, the function call will fail at runtime.
+    pure def Min(__set: Set[int]): int = {
+        __set.fold(oneOf(__set), (__m, __e) => if(__m < __e) __m else __e)
+    }
+
+    run MinTest =
+    all {
+        assert(Min(Set(1, 2, 3)) == 1),
     }
 
     pure def HasSubsequence(__this: List[a], __other: List[a]): bool = {
@@ -220,20 +232,19 @@ module extraSpells {
     }
 
     // Returns the maximum element of a set, according to a given function.
-    // __i should be part of the set if it is nonempty. If the set is empty, __i will be returned.
     // If two elements are equally large, an arbitrary one will be returned.
-    pure def MaxBy(__set: Set[a], __f: a => int, __i: a): a = {
+    // If the set is empty, the function call will fail at runtime.
+    pure def MaxBy(__set: Set[a], __f: a => int): a = {
       __set.fold(
-        __i,
+        oneOf(__set),
         (__m, __e) => if(__f(__m) > __f(__e)) {__m } else {__e}
       )
     }
 
     run MaxByTest =
     all {
-      assert(MaxBy(Set(1, 2, 3), __x => __x, 0) == 3),
-      assert(MaxBy(Set(1, 2, 3), __x => -__x, 0) == 1),
-      assert(MaxBy(Set(), __x => __x, 0) == 0),
+      assert(MaxBy(Set(1, 2, 3), __x => __x) == 3),
+      assert(MaxBy(Set(1, 2, 3), __x => -__x) == 1),
     }
 
     // Like MaxBy, but returns the minimum element.
diff --git a/tests/difference/core/quint_model/run_invariants.sh b/tests/difference/core/quint_model/run_invariants.sh
index 575b444e28..9e68690152 100755
--- a/tests/difference/core/quint_model/run_invariants.sh
+++ b/tests/difference/core/quint_model/run_invariants.sh
@@ -1,5 +1 @@
-quint run --invariant ValidatorUpdatesArePropagated ccv_statemachine.qnt --main CCVDefaultStateMachine
-quint run --invariant ValidatorSetHasExistedInv ccv_statemachine.qnt --main CCVDefaultStateMachine
-quint run --invariant SameVSCPacketsInv ccv_statemachine.qnt --main CCVDefaultStateMachine
-quint run --invariant MatureOnTimeInv ccv_statemachine.qnt --main CCVDefaultStateMachine
-quint run --invariant EventuallyMatureOnProviderInv ccv_statemachine.qnt --main CCVDefaultStateMachine
\ No newline at end of file
+quint run --invariant "all{ValidatorUpdatesArePropagated,ValidatorSetHasExistedInv,SameVSCPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv}" ccv_statemachine.qnt --main CCVDefaultStateMachine --max-steps 200000 --max-samples 200 --out out.log
\ No newline at end of file

From 289ccad3c7d8fc3cd1fbaa9b5116c7737af42414 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Mon, 2 Oct 2023 10:46:51 +0200
Subject: [PATCH 39/80] Update model for bug reporting]

---
 tests/difference/core/quint_model/README.md   |  3 ++-
 tests/difference/core/quint_model/ccv.qnt     | 27 +++++++++++++++++--
 .../core/quint_model/ccv_statemachine.qnt     | 23 +++++++++++-----
 .../core/quint_model/run_sanity_checks.sh     |  1 +
 4 files changed, 44 insertions(+), 10 deletions(-)
 create mode 100755 tests/difference/core/quint_model/run_sanity_checks.sh

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index a6451b1396..696cb183a9 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -57,4 +57,5 @@ The available sanity checks are:
 - CanTimeoutConsumer
 - CanSendVSCPackets
 - CanSendVSCMaturedPackets
-        
\ No newline at end of file
+        
+Run all sanity checks by running `run_sanity_checks.sh`.
\ No newline at end of file
diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index f329955955..7d9edf884e 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -445,6 +445,29 @@ module CCV {
         val providerStateAfterConsumerAdvancement = providerStateAfterTimeAdvancement.with(
             "consumerStatus", newConsumerStatus
         )
+
+        // for each consumer we just set to running, set its initial validator set to be the current one on the provider.
+        val newConsumerStateMap =
+            currentState.consumerStates.keys().mapBy(
+                (consumer) => 
+                if (consumersToStart.contains(consumer)) {
+                    val currentConsumerState = currentState.consumerStates.get(consumer)
+                    val newConsumerState = currentConsumerState.with(
+                        "chainState", currentConsumerState.chainState.with(
+                            "currentValidatorSet", providerStateAfterConsumerAdvancement.chainState.currentValidatorSet
+                        )
+                    )
+                    (consumer, newConsumerState)
+                } else {
+                    (consumer, currentState.consumerStates.get(consumer))
+                }
+            )
+        val newState = currentState.with(
+            "providerState", providerStateAfterConsumerAdvancement
+        ).with(
+            "consumerStates", newConsumerStateMap
+        )
+
         if (err != "") {
             Err(err)
         } else {
@@ -456,10 +479,10 @@ module CCV {
                 } else {
                     providerStateAfterConsumerAdvancement
                 }
-            val newState = currentState.with(
+            val finalState = newState.with(
                 "providerState", providerStateAfterSending
             )
-            Ok(newState)
+            Ok(finalState)
         }
     }
 
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index a0e81a5186..5c5a4bd00a 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -115,9 +115,12 @@ module CCVDefaultStateMachine {
     // and each endblock has a good chance to stop consumers, ...
     // step is thus suited to test also unhappy paths.
     action step = any {
-        nondet chain = oneOf(runningConsumers)
-        nondet timeAdvancement = oneOf(timeAdvancements)
-        EndAndBeginBlockForConsumer(chain, timeAdvancement),
+        all {
+            runningConsumers.size() > 0, // ensure there is a running consumer, otherwise this action does not make sense
+            nondet chain = oneOf(runningConsumers)
+            nondet timeAdvancement = oneOf(timeAdvancements)
+            EndAndBeginBlockForConsumer(chain, timeAdvancement),
+        },
 
         val consumerStatus = currentState.providerState.consumerStatus
         nondet consumersToStart = oneOf(unusedConsumers.powerset())
@@ -134,13 +137,19 @@ module CCVDefaultStateMachine {
 
         // try to send a packet. we could filter by chains that can actually send,
         // but it's probably not much faster than just trying and failing.
-        nondet sender = oneOf(runningConsumers)
-        DeliverVSCMaturedPacket(sender),
+        all {
+            runningConsumers.size() > 0, // ensure there is a running consumer, otherwise this action does not make sense
+            nondet sender = oneOf(runningConsumers)
+            DeliverVSCMaturedPacket(sender),
+        },
 
         // again, we could filter by chains that can actually receive,
         // but it's probably not much faster than just trying and failing.
-        nondet recciver = oneOf(runningConsumers)
-        DeliverVSCPacket(recciver),
+        all {
+            runningConsumers.size() > 0, // ensure there is a running consumer, otherwise this action does not make sense
+            nondet recciver = oneOf(runningConsumers)
+            DeliverVSCPacket(recciver),
+        },
     }
 
     // ==================
diff --git a/tests/difference/core/quint_model/run_sanity_checks.sh b/tests/difference/core/quint_model/run_sanity_checks.sh
new file mode 100755
index 0000000000..546d5468f1
--- /dev/null
+++ b/tests/difference/core/quint_model/run_sanity_checks.sh
@@ -0,0 +1 @@
+quint run --invariant "all{CanRunConsumer,CanStopConsumer,CanTimeoutConsumer,CanSendVSCPackets,CanSendVSCMaturedPackets}" ccv_statemachine.qnt --main CCVDefaultStateMachine --max-steps 2000 --max-samples 200
\ No newline at end of file

From 45cfc5cd5414579221c45a9ec1c558d6ee4e558f Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Mon, 2 Oct 2023 11:03:08 +0200
Subject: [PATCH 40/80] Remove sanity check script

---
 tests/difference/core/quint_model/README.md            | 4 +---
 tests/difference/core/quint_model/ccv.qnt              | 4 ++--
 tests/difference/core/quint_model/run_sanity_checks.sh | 1 -
 3 files changed, 3 insertions(+), 6 deletions(-)
 delete mode 100755 tests/difference/core/quint_model/run_sanity_checks.sh

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 696cb183a9..503bf9ee5e 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -56,6 +56,4 @@ The available sanity checks are:
 - CanStopConsumer
 - CanTimeoutConsumer
 - CanSendVSCPackets
-- CanSendVSCMaturedPackets
-        
-Run all sanity checks by running `run_sanity_checks.sh`.
\ No newline at end of file
+- CanSendVSCMaturedPackets
\ No newline at end of file
diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 7d9edf884e..d557da1b5a 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -457,9 +457,9 @@ module CCV {
                             "currentValidatorSet", providerStateAfterConsumerAdvancement.chainState.currentValidatorSet
                         )
                     )
-                    (consumer, newConsumerState)
+                    newConsumerState
                 } else {
-                    (consumer, currentState.consumerStates.get(consumer))
+                    currentState.consumerStates.get(consumer)
                 }
             )
         val newState = currentState.with(
diff --git a/tests/difference/core/quint_model/run_sanity_checks.sh b/tests/difference/core/quint_model/run_sanity_checks.sh
deleted file mode 100755
index 546d5468f1..0000000000
--- a/tests/difference/core/quint_model/run_sanity_checks.sh
+++ /dev/null
@@ -1 +0,0 @@
-quint run --invariant "all{CanRunConsumer,CanStopConsumer,CanTimeoutConsumer,CanSendVSCPackets,CanSendVSCMaturedPackets}" ccv_statemachine.qnt --main CCVDefaultStateMachine --max-steps 2000 --max-samples 200
\ No newline at end of file

From 4fdc2ffac153430738243cdc8bed8e97bf999ccc Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Mon, 2 Oct 2023 13:43:30 +0200
Subject: [PATCH 41/80] Fix model and randomly run invariant checks

---
 tests/difference/core/quint_model/README.md   |  21 ++--
 tests/difference/core/quint_model/ccv.qnt     |  19 ++--
 .../core/quint_model/ccv_statemachine.qnt     | 107 +++++++++++++++---
 .../quint_model/libraries/extraSpells.qnt     |   4 +-
 .../core/quint_model/run_invariants.sh        |   2 +-
 tests/difference/core/quint_model/trace.itf   |   1 +
 6 files changed, 124 insertions(+), 30 deletions(-)
 create mode 100644 tests/difference/core/quint_model/trace.itf

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 503bf9ee5e..9c2197170e 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -20,27 +20,34 @@ The parameters of the protocol are defined as consts in ccv.qnt.
 
 ### Tests
 
-To run unit tests, run `quint test ccv_test.qnt`.
+To run unit tests, run 
+```
+quint test ccv_test.qnt --main CCVTest
+```
+and 
+```
+quint test ccv_statemachine.qnt --main CCVDefaultStateMachine
+```
 
 ### Invariants
 
-The invariants I am checking are in ccv_statemachine.qnt.
+The invariants to check are in ccv_statemachine.qnt.
 Check a single invariant by running
 `quint run --invariant INVARIANT_NAME ccv_statemachine.qnt --main CCVDefaultStateMachine`,
 or all invariants one after another with the help of the script `run_invariants.sh`.
 Each invariant takes about a minute to run.
 
 Invariants are as follows:
-- [ ] ValidatorUpdatesArePropagated: When a validator power update is comitted on chain, a packet containing that change in voting power is sent to all running consumers.
-- [ ] ValidatorSetHasExistedInv: Every validator set on consumer chains is/was a validator set on the provider.
-- [ ] SameVSCPacketsInv: Ensure that consumer chains receive the same VSCPackets in the same order.
+- [X] ValidatorUpdatesArePropagated: When a validator power update is comitted on chain, a packet containing that change in voting power is sent to all running consumers.
+- [X] ValidatorSetHasExistedInv: Every validator set on consumer chains is/was a validator set on the provider.
+- [X] SameVSCPacketsInv: Ensure that consumer chains receive the same VSCPackets in the same order.
 Because of nuances with starting/stopping consumers, this invariant is not as simple as it sounds. In detail:
 For consumer chains c1, c2, if both c1 and c2 received a packet p1 sent at t1 and a packet p2 sent at t2,
 then both have received ALL packets that were sent between t1 and t2 in the same order.
-- [ ] MatureOnTimeInv: For every ValidatorSetChangePacket received by a consumer chain at 
+- [X] MatureOnTimeInv: For every ValidatorSetChangePacket received by a consumer chain at 
 time t, a MaturedVSCPacket is sent back to the provider in the first block 
 with a timestamp >= t + UnbondingPeriod on that consumer.
-- [ ] EventuallyMatureOnProviderInv: If we send a VSCPacket, this is eventually responded to by all consumers
+- [X] EventuallyMatureOnProviderInv: If we send a VSCPacket, this is eventually responded to by all consumers
 that were running at the time the packet was sent (and are still running).
 
 ### Sanity Checks
diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index d557da1b5a..a04eb0caaf 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -405,9 +405,9 @@ module CCV {
 
 
 
-    // Ends a block on the provider. This means that the current validator set is committed on chain,
-    // packets are queued, and the next block is started. Also, consumers that have passed
-    // the VSCTimeout without responding to a pending vscpacket are dropped.
+    /// Ends a block on the provider. This means that the current validator set is committed on chain,
+    /// packets are queued, and the next block is started. Also, consumers that have passed
+    /// the VSCTimeout without responding to a pending vscpacket are dropped.
     pure def endAndBeginBlockForProvider(
         currentState: ProtocolState,
         // by how much the timestamp should be advanced,
@@ -427,13 +427,18 @@ module CCV {
             "chainState", newChainState
         )
 
+        val tmpState = currentState.with(
+            "providerState", providerStateAfterTimeAdvancement
+        )
+        
         // check for VSC timeouts
         val timedOutConsumers = getRunningConsumers(providerStateAfterTimeAdvancement).filter(
             consumer => 
-            val res = TimeoutDueToVSCTimeout(currentState, consumer)
+            val res = TimeoutDueToVSCTimeout(tmpState, consumer)
             res._1
         )
 
+
         // start/stop chains
         val res = providerStateAfterTimeAdvancement.consumerStatus.StartStopConsumers(
             consumersToStart,
@@ -448,10 +453,10 @@ module CCV {
 
         // for each consumer we just set to running, set its initial validator set to be the current one on the provider.
         val newConsumerStateMap =
-            currentState.consumerStates.keys().mapBy(
+            tmpState.consumerStates.keys().mapBy(
                 (consumer) => 
                 if (consumersToStart.contains(consumer)) {
-                    val currentConsumerState = currentState.consumerStates.get(consumer)
+                    val currentConsumerState = tmpState.consumerStates.get(consumer)
                     val newConsumerState = currentConsumerState.with(
                         "chainState", currentConsumerState.chainState.with(
                             "currentValidatorSet", providerStateAfterConsumerAdvancement.chainState.currentValidatorSet
@@ -462,7 +467,7 @@ module CCV {
                     currentState.consumerStates.get(consumer)
                 }
             )
-        val newState = currentState.with(
+        val newState = tmpState.with(
             "providerState", providerStateAfterConsumerAdvancement
         ).with(
             "consumerStates", newConsumerStateMap
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index 5c5a4bd00a..5b994a79de 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -199,8 +199,8 @@ module CCVDefaultStateMachine {
                     if (commonPackets.size() == 0) {
                         true // they don't share any packets, so nothing to check
                     } else {
-                        val oldestCommonPacket = packets1.head()
-                        val newestCommonPacket = packets1[packets1.length() - 1]
+                        val newestCommonPacket = commonPackets.MaxBy(packet => packet.sendingTime)
+                        val oldestCommonPacket = commonPackets.MinBy(packet => packet.sendingTime)
                         // get all packets sent between the oldest and newest common packet
                         val packetsBetween1 = packets1.select(
                             packet => packet.sendingTime >= oldestCommonPacket.sendingTime and packet.sendingTime <= newestCommonPacket.sendingTime
@@ -220,13 +220,14 @@ module CCVDefaultStateMachine {
     // with a timestamp >= t + UnbondingPeriod
     // NOTE: because we remove the maturationTimes entry when we send the packets,
     // it suffices to check that there is never an entry in maturationTimes
-    // that is older than the current time minus the unbonding period.
+    // that has already matured, i.e. where the maturationTime is smaller-or-equal than the lastTimestamp
     val MatureOnTimeInv =
         runningConsumers.forall(
             consumer => {
                 val maturationTimes = currentState.consumerStates.get(consumer).maturationTimes
                 maturationTimes.keys().forall(
-                    packet => packet.sendingTime + UnbondingPeriodPerChain.get(consumer) <= currentState.providerState.chainState.lastTimestamp
+                    // check that the maturation time is in the future
+                    packet => maturationTimes.get(packet) >= currentState.consumerStates.get(consumer).chainState.lastTimestamp
                 )
             }
         )
@@ -244,7 +245,7 @@ module CCVDefaultStateMachine {
                 sentPackets.forall(
                     packet =>
                         // consumer still has time to respond
-                        currentState.providerState.chainState.lastTimestamp <= packet.sendingTime + VscTimeout or
+                        not(packet.sendingTime + VscTimeout < currentState.providerState.chainState.lastTimestamp) or
                         // consumer was dropped
                         currentState.providerState.consumerStatus.get(consumer) == STOPPED or
                         currentState.providerState.consumerStatus.get(consumer) == TIMEDOUT
@@ -291,20 +292,26 @@ module CCVDefaultStateMachine {
             consumer => 
                 currentState.consumerStates.get(consumer).outstandingPacketsToProvider.length() > 0
         ))
+    
+    val CanReceiveMaturations =
+        not(ConsumerChains.exists(
+            consumer => 
+                currentState.providerState.receivedMaturations.size() > 0
+        ))
 
     // ==================
     // MANUAL TEST CASES
     // ==================
     // Manually written test cases to get confidence in the base operation of the protocol.
 
-    // Test a simple happy path where:
-    // * the consumer chain is set to running
-    // * a validator set change happens
-    // * a block is ended on the provider, i.e. a packet is sent to the consumer
-    // * the consumer receives the packet
-    // * the chains wait until the unbonding period is over
-    // * the consumer sends a VSCMaturedPacket to the provider
-    // * the provider receives the VSCMaturedPacket
+    /// Test a simple happy path where:
+    /// * the consumer chain is set to running
+    /// * a validator set change happens
+    /// * a block is ended on the provider, i.e. a packet is sent to the consumer
+    /// * the consumer receives the packet
+    /// * the chains wait until the unbonding period is over
+    /// * the consumer sends a VSCMaturedPacket to the provider
+    /// * the provider receives the VSCMaturedPacket
     run HappyPathTest: bool = { 
         init.then(
             all {
@@ -385,4 +392,78 @@ module CCVDefaultStateMachine {
                 }
             )
         }
+
+    /// a manual test case for the SameVSCPacketsInv, since it needs very specific behaviour to even apply.
+    run SameVSCPacketsManualTest =
+        init.then(
+            // start all consumers except for consumer3
+            EndAndBeginBlockForProvider(1 * Second, Set("consumer1", "consumer2"), Set())
+        ).then(
+            // change voting power
+            VotingPowerChange("node1", 50)
+        ).then(
+            // send packet to consumer1 and consumer2
+            EndAndBeginBlockForProvider(1 * Second, Set(), Set())
+        ).then(
+            // deliver the packets
+            DeliverVSCPacket("consumer1")
+        ).then(
+            // deliver to consumer2
+            DeliverVSCPacket("consumer2")
+        ).then(
+            // start consumer3
+            EndAndBeginBlockForProvider(1 * Second, Set("consumer3"), Set())
+        ).then(
+            // do another voting power change
+            VotingPowerChange("node2", 50)
+        ).then(
+            // send packets
+            EndAndBeginBlockForProvider(1 * Second, Set(), Set())
+        ).then(
+            //deliver to consumer1
+            DeliverVSCPacket("consumer1")
+        ).then(
+            // deliver to consumer2
+            DeliverVSCPacket("consumer2")
+        ).then(
+            // deliver to consumer3
+            DeliverVSCPacket("consumer3")
+        )
+        .then(
+            // the SameVSCPacketInv should hold here
+            all {
+                assert(SameVSCPacketsInv),
+                // action does not matter, but needed to have uniform effect
+                step
+            }
+        )
+
+    // a manual test for the EventuallyMatureOnProvider invariant
+    run VSCTimeoutManualTest =
+        init
+        .then(
+            // start all consumer chains
+            EndAndBeginBlockForProvider(1 * Second, ConsumerChains, Set())
+        )
+        .then(
+            // change voting power
+            VotingPowerChange("node1", 50)
+        )
+        .then(
+            // send packets
+            EndAndBeginBlockForProvider(1 * Second, Set(), Set())
+        )
+        .then(
+            // advance time on provider by VSCTimeout + 1 Second
+            EndAndBeginBlockForProvider(VscTimeout + 5 * Second, Set(), Set())
+        )
+        // .then(
+        //     all {
+        //         // the consumer chains should have timed out
+        //         assert(ConsumerChains.forall(
+        //             chain => currentState.providerState.consumerStatus.get(chain) == TIMEDOUT
+        //         )),
+        //         VotingPowerChange("node2", 50)// action needs to be there but does not matter
+        //     }
+        // )
 }
\ No newline at end of file
diff --git a/tests/difference/core/quint_model/libraries/extraSpells.qnt b/tests/difference/core/quint_model/libraries/extraSpells.qnt
index 9c1fb4034d..04ae907f5d 100644
--- a/tests/difference/core/quint_model/libraries/extraSpells.qnt
+++ b/tests/difference/core/quint_model/libraries/extraSpells.qnt
@@ -248,9 +248,9 @@ module extraSpells {
     }
 
     // Like MaxBy, but returns the minimum element.
-    pure def MinBy(__set: Set[a], __f: a => int, __i: a): a = {
+    pure def MinBy(__set: Set[a], __f: a => int): a = {
       __set.fold(
-        __i,
+        oneOf(__set),
         (__m, __e) => if(__f(__m) < __f(__e)) {__m } else {__e}
       )
     }
diff --git a/tests/difference/core/quint_model/run_invariants.sh b/tests/difference/core/quint_model/run_invariants.sh
index 9e68690152..5ea6b3d387 100755
--- a/tests/difference/core/quint_model/run_invariants.sh
+++ b/tests/difference/core/quint_model/run_invariants.sh
@@ -1 +1 @@
-quint run --invariant "all{ValidatorUpdatesArePropagated,ValidatorSetHasExistedInv,SameVSCPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv}" ccv_statemachine.qnt --main CCVDefaultStateMachine --max-steps 200000 --max-samples 200 --out out.log
\ No newline at end of file
+quint run --invariant "all{ValidatorUpdatesArePropagated,ValidatorSetHasExistedInv,SameVSCPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv}" ccv_statemachine.qnt --main CCVDefaultStateMachine --max-steps 500 --max-samples 200 --out out.log
\ No newline at end of file
diff --git a/tests/difference/core/quint_model/trace.itf b/tests/difference/core/quint_model/trace.itf
new file mode 100644
index 0000000000..6bdbe79609
--- /dev/null
+++ b/tests/difference/core/quint_model/trace.itf
@@ -0,0 +1 @@
+{"#meta":{"format":"ITF","format-description":"https://apalache.informal.systems/docs/adr/015adr-trace.html","source":"ccv_statemachine.qnt","status":"violation","description":"Created by Quint on Mon Oct 02 2023 11:57:40 GMT+0200 (Central European Summer 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From 99744ff34049ccdd55da3ff2bd3c7d460a4fee99 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Mon, 2 Oct 2023 13:45:32 +0200
Subject: [PATCH 42/80] Remove trace

---
 tests/difference/core/quint_model/trace.itf | 1 -
 1 file changed, 1 deletion(-)
 delete mode 100644 tests/difference/core/quint_model/trace.itf

diff --git a/tests/difference/core/quint_model/trace.itf b/tests/difference/core/quint_model/trace.itf
deleted file mode 100644
index 6bdbe79609..0000000000
--- a/tests/difference/core/quint_model/trace.itf
+++ /dev/null
@@ -1 +0,0 @@
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\ No newline at end of file

From 1bc4610ec05b8d32baf590d44b989e0ef2727a0a Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Mon, 2 Oct 2023 13:46:16 +0200
Subject: [PATCH 43/80] Add model checking to README

---
 tests/difference/core/quint_model/README.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 9c2197170e..7687c50036 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -50,6 +50,12 @@ with a timestamp >= t + UnbondingPeriod on that consumer.
 - [X] EventuallyMatureOnProviderInv: If we send a VSCPacket, this is eventually responded to by all consumers
 that were running at the time the packet was sent (and are still running).
 
+Invariants can also be model-checked by Apalache, using this command:
+```
+quint verify --invariant ValidatorUpdatesArePropagated,ValidatorSetHasExistedInv,SameVSCPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv --main CCVDefaultState
+Machine ccv_statemachine.qnt
+```
+
 ### Sanity Checks
 
 Sanity checks verify that certain patterns of behaviour can appear in the model.

From 9e4f9c41b47abf527c46f3be02f363d0a9fe5ff3 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Mon, 2 Oct 2023 14:02:39 +0200
Subject: [PATCH 44/80] Add bluespec

---
 tests/difference/core/quint_model/ccv.qnt                   | 1 +
 tests/difference/core/quint_model/ccv_statemachine.qnt      | 1 +
 tests/difference/core/quint_model/ccv_test.qnt              | 2 ++
 tests/difference/core/quint_model/libraries/Time.qnt        | 2 ++
 tests/difference/core/quint_model/libraries/extraSpells.qnt | 2 ++
 5 files changed, 8 insertions(+)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index a04eb0caaf..6731b0b6ff 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -1,3 +1,4 @@
+// -- mode: Bluespec; --
 module CCVTypes {
     import Time.* from "./libraries/Time"
 
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index 5b994a79de..94bd652656 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -1,3 +1,4 @@
+// -- mode: Bluespec; --
 module CCVDefaultStateMachine {
     // A basic state machine that utilizes the CCV protocol.
     import CCVTypes.* from "./ccv"
diff --git a/tests/difference/core/quint_model/ccv_test.qnt b/tests/difference/core/quint_model/ccv_test.qnt
index d416c0508e..c01d886963 100644
--- a/tests/difference/core/quint_model/ccv_test.qnt
+++ b/tests/difference/core/quint_model/ccv_test.qnt
@@ -1,3 +1,5 @@
+// -- mode: Bluespec; --
+
 // contains test logic for the stateless functions in the CCV module
 module CCVTest {
     import CCVTypes.* from "./ccv"
diff --git a/tests/difference/core/quint_model/libraries/Time.qnt b/tests/difference/core/quint_model/libraries/Time.qnt
index 8497d8e1d3..06b81a3f64 100644
--- a/tests/difference/core/quint_model/libraries/Time.qnt
+++ b/tests/difference/core/quint_model/libraries/Time.qnt
@@ -1,3 +1,5 @@
+// -- mode: Bluespec; --
+
 // A simple module for time that makes timings more readable,
 // e.g. 5 * Minute.
 // The base unit are seconds, i.e. to get the number of seconds in a time value, just treat it as an int.
diff --git a/tests/difference/core/quint_model/libraries/extraSpells.qnt b/tests/difference/core/quint_model/libraries/extraSpells.qnt
index 04ae907f5d..22d731599c 100644
--- a/tests/difference/core/quint_model/libraries/extraSpells.qnt
+++ b/tests/difference/core/quint_model/libraries/extraSpells.qnt
@@ -1,3 +1,5 @@
+// -- mode: Bluespec; --
+
 // This module is just a library with utility functions (sometimes called spells in Quint).
 module extraSpells {
 

From ca50ee2ca5a4c0f4344c3ebef26e206a3a14fdfb Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Mon, 2 Oct 2023 14:04:03 +0200
Subject: [PATCH 45/80] Try fixed bluespec

---
 tests/difference/core/quint_model/ccv_test.qnt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/ccv_test.qnt b/tests/difference/core/quint_model/ccv_test.qnt
index c01d886963..a6b09a1a60 100644
--- a/tests/difference/core/quint_model/ccv_test.qnt
+++ b/tests/difference/core/quint_model/ccv_test.qnt
@@ -1,4 +1,4 @@
-// -- mode: Bluespec; --
+// -*- mode: Bluespec; -*-
 
 // contains test logic for the stateless functions in the CCV module
 module CCVTest {

From a80ce703ca5ecd61fa4b77408609aacc649201d0 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Mon, 2 Oct 2023 14:05:11 +0200
Subject: [PATCH 46/80] Fix bluespec definitions

---
 tests/difference/core/quint_model/ccv.qnt                   | 2 +-
 tests/difference/core/quint_model/ccv_statemachine.qnt      | 2 +-
 tests/difference/core/quint_model/libraries/Time.qnt        | 3 +--
 tests/difference/core/quint_model/libraries/extraSpells.qnt | 2 +-
 4 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 6731b0b6ff..141b5bf06d 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -1,4 +1,4 @@
-// -- mode: Bluespec; --
+// -*- mode: Bluespec; -*-
 module CCVTypes {
     import Time.* from "./libraries/Time"
 
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index 94bd652656..e12fdf7d85 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -1,4 +1,4 @@
-// -- mode: Bluespec; --
+// -*- mode: Bluespec; -*-
 module CCVDefaultStateMachine {
     // A basic state machine that utilizes the CCV protocol.
     import CCVTypes.* from "./ccv"
diff --git a/tests/difference/core/quint_model/libraries/Time.qnt b/tests/difference/core/quint_model/libraries/Time.qnt
index 06b81a3f64..a85d97697d 100644
--- a/tests/difference/core/quint_model/libraries/Time.qnt
+++ b/tests/difference/core/quint_model/libraries/Time.qnt
@@ -1,5 +1,4 @@
-// -- mode: Bluespec; --
-
+// -*- mode: Bluespec; -*-
 // A simple module for time that makes timings more readable,
 // e.g. 5 * Minute.
 // The base unit are seconds, i.e. to get the number of seconds in a time value, just treat it as an int.
diff --git a/tests/difference/core/quint_model/libraries/extraSpells.qnt b/tests/difference/core/quint_model/libraries/extraSpells.qnt
index 22d731599c..24f37d919d 100644
--- a/tests/difference/core/quint_model/libraries/extraSpells.qnt
+++ b/tests/difference/core/quint_model/libraries/extraSpells.qnt
@@ -1,4 +1,4 @@
-// -- mode: Bluespec; --
+// -*- mode: Bluespec; -*-
 
 // This module is just a library with utility functions (sometimes called spells in Quint).
 module extraSpells {

From 918e71a186c6bf808ebcec1b2785e7f966f7e5c3 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <57488781+p-offtermatt@users.noreply.github.com>
Date: Thu, 5 Oct 2023 17:29:34 +0200
Subject: [PATCH 47/80] Update tests/difference/core/quint_model/README.md

Co-authored-by: insumity <insumity@users.noreply.github.com>
---
 tests/difference/core/quint_model/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 7687c50036..d7b9ebd78e 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -7,7 +7,7 @@ The core of the protocol.
 - ccv_statemachine.qnt: Contains the state machine layer for CCV. Very roughly speaking, this could be seen as "e2e tests".
 Also contains invariants.
 - ccv_test.qnt: Contains unit tests for the functional layer of CCV.
-- libararies/*: Libraries that don't belong to CCV, but are used by it.
+- libraries/*: Libraries that don't belong to CCV, but are used by it.
 
 ### Model details
 

From 8da4cfe951cd3944ae79cf41e1535aa36189e441 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <57488781+p-offtermatt@users.noreply.github.com>
Date: Thu, 5 Oct 2023 17:29:43 +0200
Subject: [PATCH 48/80] Update tests/difference/core/quint_model/README.md

Co-authored-by: insumity <insumity@users.noreply.github.com>
---
 tests/difference/core/quint_model/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index d7b9ebd78e..a420737801 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -11,7 +11,7 @@ Also contains invariants.
 
 ### Model details
 
-To see the data structures used in the model, see the ProtocolState type in ccv.qnt.
+To see the data structures used in the model, see the `ProtocolState` type in ccv.qnt.
 
 The "public" endpoints of the model are those functions that take as an input the protocol state, and return a Result.
 Other functions are for utility.

From 2a682368c7c1df44e017ab6b37b5bf29b9831f84 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Thu, 5 Oct 2023 17:50:44 +0200
Subject: [PATCH 49/80] Fix minor issues

---
 tests/difference/core/quint_model/ccv.qnt     | 24 -------------------
 .../core/quint_model/ccv_statemachine.qnt     |  5 ++--
 .../difference/core/quint_model/ccv_test.qnt  | 24 +++++++++++++++++++
 3 files changed, 27 insertions(+), 26 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 141b5bf06d..43dca0ccc2 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -324,30 +324,6 @@ module CCV {
         }
     }   
 
-    // Defines a test state to test the deliverPacketToProvider function against.
-    pure val _DeliverPacketToProvider_TestState =
-        val currentState = GetEmptyProtocolState
-        val sender = "sender"
-        val providerState = currentState.providerState
-        val consumerState = GetEmptyConsumerState
-        // add the consumer to the consumerStates
-        val consumerStates = currentState.consumerStates.put(sender, consumerState)
-        val providerState2 = providerState.with(
-            "consumerStatus", providerState.consumerStatus.put(sender, RUNNING)
-        )
-        val providerState3 = providerState2.with(
-            "outstandingPacketsToConsumer", providerState2.outstandingPacketsToConsumer.put(sender, List({
-                id: 0,
-                validatorSet: Map(),
-                sendingTime: 0
-            }))
-        )
-        currentState.with(
-            "providerState", providerState3
-        ).with(
-            "consumerStates", consumerStates
-        )
-
     // Delivers the next queued VSCPacket from the provider chain to a consumer chain.
     // Only argument is the consumer chain, to which the packet will be delivered.
     // If this packet will time out on the consumer on delivery,
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index e12fdf7d85..b4229c05e0 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -169,9 +169,10 @@ module CCVDefaultStateMachine {
 
     // Any update in the power of a validator on the provider
     // MUST be present in a ValidatorSetChangePacket that is sent to all registered consumer chains
-    val ValidatorUpdatesArePropagated =
+    val ValUpdatePrecondition = trace[trace.length()-1] == "EndAndBeginBlockForProvider"
+    val ValidatorUpdatesArePropagated = 
         // when the provider has just entered a validator set into a block...
-        if (trace == trace.append("EndAndBeginBlockForProvider")) {
+        if (ValUpdatePrecondition and currentState.providerState.providerValidatorSetChangedInThisBlock) {
             val providerValSetInCurBlock = providerValidatorHistory.head()
             // ... for each consumer that is running then ...
             runningConsumers.forall(
diff --git a/tests/difference/core/quint_model/ccv_test.qnt b/tests/difference/core/quint_model/ccv_test.qnt
index a6b09a1a60..7f3e6a69fd 100644
--- a/tests/difference/core/quint_model/ccv_test.qnt
+++ b/tests/difference/core/quint_model/ccv_test.qnt
@@ -84,6 +84,30 @@ module CCVTest {
         result.newState.providerState.chainState.votingPowerHistory == List()
     }
 
+    // Defines a test state to test the deliverPacketToProvider function against.
+    pure val _DeliverPacketToProvider_TestState =
+        val currentState = GetEmptyProtocolState
+        val sender = "sender"
+        val providerState = currentState.providerState
+        val consumerState = GetEmptyConsumerState
+        // add the consumer to the consumerStates
+        val consumerStates = currentState.consumerStates.put(sender, consumerState)
+        val providerState2 = providerState.with(
+            "consumerStatus", providerState.consumerStatus.put(sender, RUNNING)
+        )
+        val providerState3 = providerState2.with(
+            "outstandingPacketsToConsumer", providerState2.outstandingPacketsToConsumer.put(sender, List({
+                id: 0,
+                validatorSet: Map(),
+                sendingTime: 0
+            }))
+        )
+        currentState.with(
+            "providerState", providerState3
+        ).with(
+            "consumerStates", consumerStates
+        )
+
     // add a packet on the consumer
     pure val DeliverPacketToProviderHappyPathTest_testState = _DeliverPacketToProvider_TestState.with(
         "consumerStates", _DeliverPacketToProvider_TestState.consumerStates.put(

From 2ad4debe00fdfe6e441a2375a8a773a161d0667a Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <57488781+p-offtermatt@users.noreply.github.com>
Date: Fri, 6 Oct 2023 08:41:36 +0200
Subject: [PATCH 50/80] Update tests/difference/core/quint_model/README.md

Co-authored-by: insumity <insumity@users.noreply.github.com>
---
 tests/difference/core/quint_model/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index a420737801..183f42137e 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -13,7 +13,7 @@ Also contains invariants.
 
 To see the data structures used in the model, see the `ProtocolState` type in ccv.qnt.
 
-The "public" endpoints of the model are those functions that take as an input the protocol state, and return a Result.
+The "public" endpoints of the model are those functions that take as an input the protocol state, and return a `Result`.
 Other functions are for utility.
 
 The parameters of the protocol are defined as consts in ccv.qnt.

From 9d408428939f21336e50148413fe9b967f8f8305 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <57488781+p-offtermatt@users.noreply.github.com>
Date: Fri, 6 Oct 2023 08:41:43 +0200
Subject: [PATCH 51/80] Update tests/difference/core/quint_model/README.md

Co-authored-by: insumity <insumity@users.noreply.github.com>
---
 tests/difference/core/quint_model/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 183f42137e..906b93e90f 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -16,7 +16,7 @@ To see the data structures used in the model, see the `ProtocolState` type in cc
 The "public" endpoints of the model are those functions that take as an input the protocol state, and return a `Result`.
 Other functions are for utility.
 
-The parameters of the protocol are defined as consts in ccv.qnt.
+The parameters of the protocol are defined as consts in [ccv.qnt](ccv.qnt).
 
 ### Tests
 

From 3eeb3fd5bc21ac1273f498d369e96be59ac3d53a Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <57488781+p-offtermatt@users.noreply.github.com>
Date: Fri, 6 Oct 2023 08:44:50 +0200
Subject: [PATCH 52/80] Update tests/difference/core/quint_model/README.md

Co-authored-by: insumity <insumity@users.noreply.github.com>
---
 tests/difference/core/quint_model/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 906b93e90f..66e34fd947 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -31,7 +31,7 @@ quint test ccv_statemachine.qnt --main CCVDefaultStateMachine
 
 ### Invariants
 
-The invariants to check are in ccv_statemachine.qnt.
+The invariants to check are in [ccv_statemachine.qnt](ccv_statemachine.qnt).
 Check a single invariant by running
 `quint run --invariant INVARIANT_NAME ccv_statemachine.qnt --main CCVDefaultStateMachine`,
 or all invariants one after another with the help of the script `run_invariants.sh`.

From 2000272940a84186d9bdc32eaf22e1250e5c4090 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 6 Oct 2023 08:47:51 +0200
Subject: [PATCH 53/80] Correct verify command by adding \

---
 tests/difference/core/quint_model/README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 66e34fd947..a2f66945b4 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -52,8 +52,8 @@ that were running at the time the packet was sent (and are still running).
 
 Invariants can also be model-checked by Apalache, using this command:
 ```
-quint verify --invariant ValidatorUpdatesArePropagated,ValidatorSetHasExistedInv,SameVSCPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv --main CCVDefaultState
-Machine ccv_statemachine.qnt
+quint verify --invariant ValidatorUpdatesArePropagated,ValidatorSetHasExistedInv,SameVSCPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv \
+--main CCVDefaultStateMachine ccv_statemachine.qnt
 ```
 
 ### Sanity Checks

From 7cd826bb8ba3990fe4384e81a423c24db8524c6b Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 6 Oct 2023 08:49:27 +0200
Subject: [PATCH 54/80] Add Inv to ValidatorUpdatesArePropagated

---
 tests/difference/core/quint_model/README.md            | 4 ++--
 tests/difference/core/quint_model/ccv_statemachine.qnt | 2 +-
 tests/difference/core/quint_model/run_invariants.sh    | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index a2f66945b4..4a36b4976b 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -38,7 +38,7 @@ or all invariants one after another with the help of the script `run_invariants.
 Each invariant takes about a minute to run.
 
 Invariants are as follows:
-- [X] ValidatorUpdatesArePropagated: When a validator power update is comitted on chain, a packet containing that change in voting power is sent to all running consumers.
+- [X] ValidatorUpdatesArePropagatedInv: When a validator power update is comitted on chain, a packet containing that change in voting power is sent to all running consumers.
 - [X] ValidatorSetHasExistedInv: Every validator set on consumer chains is/was a validator set on the provider.
 - [X] SameVSCPacketsInv: Ensure that consumer chains receive the same VSCPackets in the same order.
 Because of nuances with starting/stopping consumers, this invariant is not as simple as it sounds. In detail:
@@ -52,7 +52,7 @@ that were running at the time the packet was sent (and are still running).
 
 Invariants can also be model-checked by Apalache, using this command:
 ```
-quint verify --invariant ValidatorUpdatesArePropagated,ValidatorSetHasExistedInv,SameVSCPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv \
+quint verify --invariant ValidatorUpdatesArePropagatedInv,ValidatorSetHasExistedInv,SameVSCPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv \
 --main CCVDefaultStateMachine ccv_statemachine.qnt
 ```
 
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index b4229c05e0..51edafcf58 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -170,7 +170,7 @@ module CCVDefaultStateMachine {
     // Any update in the power of a validator on the provider
     // MUST be present in a ValidatorSetChangePacket that is sent to all registered consumer chains
     val ValUpdatePrecondition = trace[trace.length()-1] == "EndAndBeginBlockForProvider"
-    val ValidatorUpdatesArePropagated = 
+    val ValidatorUpdatesArePropagatedInv = 
         // when the provider has just entered a validator set into a block...
         if (ValUpdatePrecondition and currentState.providerState.providerValidatorSetChangedInThisBlock) {
             val providerValSetInCurBlock = providerValidatorHistory.head()
diff --git a/tests/difference/core/quint_model/run_invariants.sh b/tests/difference/core/quint_model/run_invariants.sh
index 5ea6b3d387..142095682f 100755
--- a/tests/difference/core/quint_model/run_invariants.sh
+++ b/tests/difference/core/quint_model/run_invariants.sh
@@ -1 +1 @@
-quint run --invariant "all{ValidatorUpdatesArePropagated,ValidatorSetHasExistedInv,SameVSCPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv}" ccv_statemachine.qnt --main CCVDefaultStateMachine --max-steps 500 --max-samples 200 --out out.log
\ No newline at end of file
+quint run --invariant "all{ValidatorUpdatesArePropagatedInv,ValidatorSetHasExistedInv,SameVSCPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv}" ccv_statemachine.qnt --main CCVDefaultStateMachine --max-steps 500 --max-samples 200 --out out.log
\ No newline at end of file

From 7df2b1ffcbb02270011fc05ffd4bd5134bacc068 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <57488781+p-offtermatt@users.noreply.github.com>
Date: Fri, 6 Oct 2023 08:51:33 +0200
Subject: [PATCH 55/80] Update tests/difference/core/quint_model/README.md

Co-authored-by: insumity <insumity@users.noreply.github.com>
---
 tests/difference/core/quint_model/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 4a36b4976b..bfd7795d02 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -60,7 +60,7 @@ quint verify --invariant ValidatorUpdatesArePropagatedInv,ValidatorSetHasExisted
 
 Sanity checks verify that certain patterns of behaviour can appear in the model.
 In detail, they are invariant checks that we expect to fail.
-They usually negate the appearance of some behaviour, i.e. not(DesirableBehaviour).
+They usually negate the appearance of some behaviour, i.e. `not(DesirableBehaviour)`.
 Then, a counterexample for this is an example trace exhibiting the behaviour.
 
 They are run like invariant checks, i.e. `quint run --invariant SANITY_CHECK_NAME ccv_statemachine.qnt --main CCVDefaultStateMachine`.

From 3633dc443b5afbf4c04f087a79604d17df50011d Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Tue, 10 Oct 2023 12:56:43 +0200
Subject: [PATCH 56/80] Apply comments

---
 tests/difference/core/quint_model/ccv.qnt     | 102 +++++++++---------
 .../core/quint_model/ccv_statemachine.qnt     |  74 ++++++-------
 .../difference/core/quint_model/ccv_test.qnt  |   4 +-
 3 files changed, 90 insertions(+), 90 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 43dca0ccc2..fe605d450b 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -5,26 +5,26 @@ module CCVTypes {
     type Node = str
     type Chain = str
     type Power = int
-    type VSCId = int
+    type VscId = int
     type ValidatorSet = Node -> Power
     type Height = int
     // a list of validator sets per blocks, ordered by recency
     type VotingPowerHistory = List[ValidatorSet]
 
-    type VSCPacket =
+    type VscPacket =
         {   
             // the identifier for this packet
-            id: VSCId,
+            id: VscId,
             // the new validator set. in the implementation, this would be a list of validator updates
             validatorSet: ValidatorSet,
             // the time at which the packet was sent. used to check whether packets have timed out.
             sendingTime: Time
         }
 
-    type VSCMaturedPacket = 
+    type VscMaturedPacket = 
         {
-            // the id of the VSCPacket that matured
-            id: VSCId,
+            // the id of the VscPacket that matured
+            id: VscId,
             // the time at which the packet was sent. used to check whether packets have timed out.
             sendingTime: Time
         }
@@ -61,15 +61,15 @@ module CCVTypes {
             chainState: ChainState,
 
             // Stores, for each consumer chain, the list of packets that have been sent to the consumer chain
-            // and have not been received yet.
+            // and *have not been received yet*.
             // In the implementation, this would roughly be the unacknowledged packets on an ibc channel.
-            outstandingPacketsToConsumer: Chain -> List[VSCPacket],
+            outstandingPacketsToConsumer: Chain -> List[VscPacket],
 
-            // the set of received VSCMaturedPackets
-            receivedMaturations: Set[VSCMaturedPacket],
+            // the set of received VscMaturedPackets
+            receivedMaturations: Set[VscMaturedPacket],
 
-            // stores which VSC Packets have been sent to compare with receivedMaturations to detect timeouts due to non-responsiveness
-            sentVSCPackets: Chain -> List[VSCPacket],
+            // Stores VscPackets which have been sent but where the provider has *not received a response yet*.
+            sentVscPackets: Chain -> List[VscPacket],
 
             // stores whether, in this block, the validator set has changed.
             // this is needed because the validator set might be considered to have changed, even though
@@ -82,7 +82,7 @@ module CCVTypes {
             consumerStatus: Chain -> str,
 
             // a monotonic strictly increasing and positive ID that is used
-            // to uniquely identify the VSCs sent to the consumer chains.
+            // to uniquely identify the Vscs sent to the consumer chains.
             runningVscId: int,
         }
 
@@ -92,7 +92,7 @@ module CCVTypes {
             chainState: GetEmptyChainState,
             outstandingPacketsToConsumer: Map(),
             receivedMaturations: Set(),
-            sentVSCPackets: Map(),
+            sentVscPackets: Map(),
             providerValidatorSetChangedInThisBlock: false,
             consumerStatus: Map(),
             runningVscId: 0,
@@ -104,18 +104,18 @@ module CCVTypes {
         // the state that each chain needs to store
         chainState: ChainState,
 
-        // Stores the maturation times for VSCPackets received by this consumer
-        maturationTimes: VSCPacket -> Time,
+        // Stores the maturation times for VscPackets received by this consumer
+        maturationTimes: VscPacket -> Time,
 
         // stores the received vscpackets in descending order of recency,
         // i.e. newest first.
-        receivedVSCPackets: List[VSCPacket],
+        receivedVscPackets: List[VscPacket],
 
         // Stores the list of packets that have been sent to the provider chain by this consumer
         // and have not been received yet.
         // ordered by recency, so the head is the oldest packet.
         // In the implementation, essentially unacknowledged IBC packets.
-        outstandingPacketsToProvider: List[VSCMaturedPacket],
+        outstandingPacketsToProvider: List[VscMaturedPacket],
     }
 
     // utility function: returns a consumer state that is initialized minimally.
@@ -124,7 +124,7 @@ module CCVTypes {
             chainState: GetEmptyChainState,
             maturationTimes: Map(),
             outstandingPacketsToProvider: List(),
-            receivedVSCPackets: List(),
+            receivedVscPackets: List(),
         }
 
     // the state of the protocol consists of the composition of the state of one provider chain with potentially many consumer chains.
@@ -178,7 +178,7 @@ module CCVTypes {
                     },
                     outstandingPacketsToConsumer: Map(),
                     receivedMaturations: Set(),
-                    sentVSCPackets: Map(),
+                    sentVscPackets: Map(),
                     providerValidatorSetChangedInThisBlock: false,
                     consumerStatus: Map(),
                     runningVscId: 0,
@@ -194,7 +194,7 @@ module CCVTypes {
     // possible consumer statuses
     pure val STOPPED = "stopped" // the chain was once a consumer chain, but has been voluntarily dropped by the provider.
     pure val TIMEDOUT = "timedout" // the chain has timed out and was dropped by the provider. This is only used for involuntary drops.
-    pure val RUNNING = "running" // the chain is currently a consumer chain. Running chains are those that get sent VSCPackets.
+    pure val RUNNING = "running" // the chain is currently a consumer chain. Running chains are those that get sent VscPackets.
     pure val UNUSED = "unused" // the chain has never been a consumer chain, and is available to become one.
     // When a chain is dropped, it cannot become a consumer again - we assume that would be done by another consumer becoming running.
 
@@ -214,7 +214,7 @@ module CCV {
 
     // Things that explicitly are modelled:
     // * Validator set changes are propagated from provider to consumers
-    // * VSC packets mature
+    // * Vsc packets mature
 
     // We assume that packet receive + ack happen synchronously, 
     // i.e. when the packet is delivered, the ack is delivered right afterwards.
@@ -235,8 +235,8 @@ module CCV {
     // For each chain, this defines the time between the initiation of an unbonding and its maturation.
     const UnbondingPeriodPerChain: Chain -> int
 
-    // The maximum time duration between sending any VSCPacket to any consumer chain and receiving the
-    // corresponding VSCMaturedPacket, without timing out the consumer chain and consequently removing it.
+    // The maximum time duration between sending any VscPacket to any consumer chain and receiving the
+    // corresponding VscMaturedPacket, without timing out the consumer chain and consequently removing it.
     const VscTimeout: int
 
     // The timeoutTimestamp for sent packets. Can differ by chain.
@@ -267,7 +267,7 @@ module CCV {
             }
     }
 
-    // Delivers the next queued VSCMaturedPacket from a consumer chain to the provider chain.
+    // Delivers the next queued VscMaturedPacket from a consumer chain to the provider chain.
     // Only argument is the consumer chain, from which the packet will be delivered.
     // If this packet will time out on the provider on delivery,
     // the consumer will be dropped.
@@ -324,7 +324,7 @@ module CCV {
         }
     }   
 
-    // Delivers the next queued VSCPacket from the provider chain to a consumer chain.
+    // Delivers the next queued VscPacket from the provider chain to a consumer chain.
     // Only argument is the consumer chain, to which the packet will be delivered.
     // If this packet will time out on the consumer on delivery,
     // the consumer will be dropped.
@@ -384,7 +384,7 @@ module CCV {
 
     /// Ends a block on the provider. This means that the current validator set is committed on chain,
     /// packets are queued, and the next block is started. Also, consumers that have passed
-    /// the VSCTimeout without responding to a pending vscpacket are dropped.
+    /// the VscTimeout without responding to a pending vscpacket are dropped.
     pure def endAndBeginBlockForProvider(
         currentState: ProtocolState,
         // by how much the timestamp should be advanced,
@@ -408,10 +408,10 @@ module CCV {
             "providerState", providerStateAfterTimeAdvancement
         )
         
-        // check for VSC timeouts
+        // check for Vsc timeouts
         val timedOutConsumers = getRunningConsumers(providerStateAfterTimeAdvancement).filter(
             consumer => 
-            val res = TimeoutDueToVSCTimeout(tmpState, consumer)
+            val res = TimeoutDueToVscTimeout(tmpState, consumer)
             res._1
         )
 
@@ -474,9 +474,9 @@ module CCV {
         // by how much the timestamp of the chain should be advanced for the next block
         timeAdvancement: Time): Result = {
             if (not(currentState.consumerStates.keys().contains(chain))) {
+                // if the chain is not a consumer, return an error
                 Err("chain is not a consumer")
             } else {
-                // if the chain is not a consumer, return an error
                 val currentConsumerState = currentState.consumerStates.get(chain)
                 val newChainState = currentConsumerState.chainState.endAndBeginBlockShared(timeAdvancement)
                 val newConsumerState = currentConsumerState.with(
@@ -644,7 +644,7 @@ module CCV {
     }
 
     // returns the providerState with the following modifications:
-    // * sends VSCPackets to all running consumers
+    // * sends VscPackets to all running consumers
     // * increments the runningVscId
     // This should only be called when the provider chain is ending a block,
     // and only when the running validator set is considered to have changed
@@ -665,7 +665,7 @@ module CCV {
             }
         )
         providerState.with(
-            // send VSCPackets to consumers
+            // send VscPackets to consumers
             "outstandingPacketsToConsumer",
             ConsumerChains.mapBy(
                 (consumer) => 
@@ -674,11 +674,11 @@ module CCV {
                 )
             )
             ).with(
-                // update the sent VSCPackets
-                "sentVSCPackets",
+                // update the sent VscPackets
+                "sentVscPackets",
                 ConsumerChains.mapBy(
                     (consumer) => 
-                    providerState.sentVSCPackets.get(consumer).concat(
+                    providerState.sentVscPackets.get(consumer).concat(
                         newSentPacketsPerConsumer.get(consumer)
                     )
                 )
@@ -694,7 +694,7 @@ module CCV {
     // To receive a packet, modify the running validator set (not the one entered into the block yet,
     // but the candidate that would be put into the block if it ended now)
     // and store the maturation time for the packet.
-    pure def recvPacketOnConsumer(currentState: ProtocolState, receiver: Chain, packet: VSCPacket): Result = {
+    pure def recvPacketOnConsumer(currentState: ProtocolState, receiver: Chain, packet: VscPacket): Result = {
         if(not(isCurrentlyConsumer(receiver, currentState.providerState))) {
             Err("Receiver is not currently a consumer - must have 'running' status!")
         } else {
@@ -713,8 +713,8 @@ module CCV {
                     currentConsumerState.chainState.lastTimestamp + UnbondingPeriodPerChain.get(receiver)
                 )
             ).with(
-                "receivedVSCPackets",
-                currentConsumerState.receivedVSCPackets.prepend(packet)
+                "receivedVscPackets",
+                currentConsumerState.receivedVscPackets.prepend(packet)
             )
             val newConsumerStates = currentState.consumerStates.set(receiver, newConsumerState)
             val newState = currentState.with(
@@ -726,20 +726,20 @@ module CCV {
 
     // receives a given packet on the provider. The arguments are the consumer chain that sent the packet, and the packet itself.
     // To receive a packet, add it to the list of received maturations.
-    pure def recvPacketOnProvider(currentState: ProtocolState, sender: Chain, packet: VSCMaturedPacket): Result = {
+    pure def recvPacketOnProvider(currentState: ProtocolState, sender: Chain, packet: VscMaturedPacket): Result = {
         if (not(isCurrentlyConsumer(sender, currentState.providerState))) {
             Err("Sender is not currently a consumer - must have 'running' status!")
-        } else if (currentState.providerState.sentVSCPackets.get(sender).head().id != packet.id) {
-            // the packet is not the oldest sentVSCPacket, something went wrong
-            Err("Received maturation is not for the oldest sentVSCPacket")
+        } else if (currentState.providerState.sentVscPackets.get(sender).head().id != packet.id) {
+            // the packet is not the oldest sentVscPacket, something went wrong
+            Err("Received maturation is not for the oldest sentVscPacket")
         } else {
             val currentReceivedMaturations = currentState.providerState.receivedMaturations
             val newReceivedMaturations = currentReceivedMaturations.union(Set(packet))
             val newProviderState = currentState.providerState.with(
                 "receivedMaturations", newReceivedMaturations
             )
-            // prune the sentVSCPacket
-            val newSentVSCPacket = currentState.providerState.sentVSCPackets.get(sender).tail()
+            // prune the sentVscPacket
+            val newSentVscPacket = currentState.providerState.sentVscPackets.get(sender).tail()
             val newState = currentState.with(
                 "providerState", newProviderState
             )
@@ -820,11 +820,11 @@ module CCV {
         )
     }
 
-    // Returns whether the consumer has timed out due to the VSCTimeout, and an error message.
+    // Returns whether the consumer has timed out due to the VscTimeout, and an error message.
     // If the second return is not equal to "", the first return should be ignored.
     // If it is equal to "", the first return will be true if the consumer has timed out and should be dropped,
     // or false otherwise.
-    pure def TimeoutDueToVSCTimeout(currentState: ProtocolState, consumer: Chain): (bool, str) =
+    pure def TimeoutDueToVscTimeout(currentState: ProtocolState, consumer: Chain): (bool, str) =
         // check for errors: the consumer is not running
         if (not(isCurrentlyConsumer(consumer, currentState.providerState))) {
             (false, "Consumer is not currently a consumer - must have 'running' status!")
@@ -832,11 +832,11 @@ module CCV {
             val providerState = currentState.providerState
             val consumerState = currentState.consumerStates.get(consumer)
 
-            // has a packet been sent on the provider more than VSCTimeout ago, but we have not received an answer since then?
-            val sentVSCPackets = providerState.sentVSCPackets.get(consumer)
-            if(sentVSCPackets.length() > 0) {
-                val oldestSentVSCPacket = sentVSCPackets.head() // if length is 0, this is undefined, but we check for this before we use it
-                if(oldestSentVSCPacket.sendingTime + VscTimeout < providerState.chainState.lastTimestamp) {
+            // has a packet been sent on the provider more than VscTimeout ago, but we have not received an answer since then?
+            val sentVscPackets = providerState.sentVscPackets.get(consumer)
+            if(sentVscPackets.length() > 0) {
+                val oldestSentVscPacket = sentVscPackets.head() // if length is 0, this is undefined, but we check for this before we use it
+                if(oldestSentVscPacket.sendingTime + VscTimeout < providerState.chainState.lastTimestamp) {
                     (true, "")
                 } else {
                     // no timeout yet, it has not been VscTimeout since that packet was sent
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index 51edafcf58..b75d2b2d3e 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -36,7 +36,7 @@ module CCVDefaultStateMachine {
             "outstandingPacketsToConsumer", 
             ConsumerChains.mapBy(chain => List())
         ).with(
-            "sentVSCPackets", 
+            "sentVscPackets", 
             ConsumerChains.mapBy(chain => List())
         ).with(
             // set the validator set to be the initial validator set in the history
@@ -61,26 +61,26 @@ module CCVDefaultStateMachine {
             trace' = trace.append("VotingPowerChange")
         }
 
-    // The receiver receives the next outstanding VSCPacket from the provider.
+    // The receiver receives the next outstanding VscPacket from the provider.
     // This will time out the consumer if the packet timeout has passed on the receiver.
-    action DeliverVSCPacket(receiver: Chain): bool = 
+    action DeliverVscPacket(receiver: Chain): bool = 
         val resultAndTimeout = deliverPacketToConsumer(currentState, receiver)
         val result = resultAndTimeout._1
         all {
             result.hasError == false,
             currentState' = result.newState,
-            trace' = trace.append("DeliverVSCPacket")
+            trace' = trace.append("DeliverVscPacket")
         }
 
-    // The provider receives the next outstanding VSCMaturedPacket from the sender.
+    // The provider receives the next outstanding VscMaturedPacket from the sender.
     // This will time out the consumer if the packet timeout has passed on the provider.
-    action DeliverVSCMaturedPacket(sender: Chain): bool =
+    action DeliverVscMaturedPacket(sender: Chain): bool =
         val resultAndTimeout = deliverPacketToProvider(currentState, sender)
         val result = resultAndTimeout._1
         all {
             result.hasError == false,
             currentState' = result.newState,
-            trace' = trace.append("DeliverVSCMaturedPacket")
+            trace' = trace.append("DeliverVscMaturedPacket")
         }
 
     action EndAndBeginBlockForProvider(
@@ -141,7 +141,7 @@ module CCVDefaultStateMachine {
         all {
             runningConsumers.size() > 0, // ensure there is a running consumer, otherwise this action does not make sense
             nondet sender = oneOf(runningConsumers)
-            DeliverVSCMaturedPacket(sender),
+            DeliverVscMaturedPacket(sender),
         },
 
         // again, we could filter by chains that can actually receive,
@@ -149,7 +149,7 @@ module CCVDefaultStateMachine {
         all {
             runningConsumers.size() > 0, // ensure there is a running consumer, otherwise this action does not make sense
             nondet recciver = oneOf(runningConsumers)
-            DeliverVSCPacket(recciver),
+            DeliverVscPacket(recciver),
         },
     }
 
@@ -177,7 +177,7 @@ module CCVDefaultStateMachine {
             // ... for each consumer that is running then ...
             runningConsumers.forall(
                 // ...the validator set is in a sent packet
-                consumer => currentState.providerState.sentVSCPackets.get(consumer).toSet().exists(
+                consumer => currentState.providerState.sentVscPackets.get(consumer).toSet().exists(
                     packet => packet.validatorSet == providerValSetInCurBlock
                 )
             )
@@ -191,12 +191,12 @@ module CCVDefaultStateMachine {
     // we need a slightly weaker invariant:
     // For consumer chains c1, c2, if both c1 and c2 received a packet p1 sent at t1 and a packet p2 sent at t2,
     // then both have received ALL packets that were sent between t1 and t2.
-    val SameVSCPacketsInv =
+    val SameVscPacketsInv =
         runningConsumers.forall(
             consumer1 => runningConsumers.forall(
                 consumer2 => {
-                    val packets1 = currentState.consumerStates.get(consumer1).receivedVSCPackets
-                    val packets2 = currentState.consumerStates.get(consumer2).receivedVSCPackets
+                    val packets1 = currentState.consumerStates.get(consumer1).receivedVscPackets
+                    val packets2 = currentState.consumerStates.get(consumer2).receivedVscPackets
                     val commonPackets = packets1.toSet().intersect(packets2.toSet())
                     if (commonPackets.size() == 0) {
                         true // they don't share any packets, so nothing to check
@@ -218,7 +218,7 @@ module CCVDefaultStateMachine {
         )
 
     // For every ValidatorSetChangePacket received by a consumer chain at 
-    // time t, a MaturedVSCPacket is sent back to the provider in the first block 
+    // time t, a MaturedVscPacket is sent back to the provider in the first block 
     // with a timestamp >= t + UnbondingPeriod
     // NOTE: because we remove the maturationTimes entry when we send the packets,
     // it suffices to check that there is never an entry in maturationTimes
@@ -234,16 +234,16 @@ module CCVDefaultStateMachine {
             }
         )
 
-    // If we send a VSCPacket, this is eventually responded to by all consumers
+    // If we send a VscPacket, this is eventually responded to by all consumers
     // that were running at the time the packet was sent (and are still running).
-    // Since we remove sentVSCPackets when we receive responses for them,
-    // we just check that if a sentVSCPacket has been sent more than
-    // VSCTimeout ago, the consumer must have been dropped.
+    // Since we remove sentVscPackets when we receive responses for them,
+    // we just check that if a sentVscPacket has been sent more than
+    // VscTimeout ago, the consumer must have been dropped.
     // In practice, when this is true, a pending unbonding can mature.
     val EventuallyMatureOnProviderInv =
         runningConsumers.forall(
             consumer => {
-                val sentPackets = currentState.providerState.sentVSCPackets.get(consumer).toSet()
+                val sentPackets = currentState.providerState.sentVscPackets.get(consumer).toSet()
                 sentPackets.forall(
                     packet =>
                         // consumer still has time to respond
@@ -283,13 +283,13 @@ module CCVDefaultStateMachine {
                 currentState.providerState.consumerStatus.get(consumer) == TIMEDOUT
         ))
 
-    val CanSendVSCPackets =
+    val CanSendVscPackets =
         not(ConsumerChains.exists(
             consumer => 
                 currentState.providerState.outstandingPacketsToConsumer.get(consumer).length() > 0
         ))
 
-    val CanSendVSCMaturedPackets =
+    val CanSendVscMaturedPackets =
         not(ConsumerChains.exists(
             consumer => 
                 currentState.consumerStates.get(consumer).outstandingPacketsToProvider.length() > 0
@@ -312,8 +312,8 @@ module CCVDefaultStateMachine {
     /// * a block is ended on the provider, i.e. a packet is sent to the consumer
     /// * the consumer receives the packet
     /// * the chains wait until the unbonding period is over
-    /// * the consumer sends a VSCMaturedPacket to the provider
-    /// * the provider receives the VSCMaturedPacket
+    /// * the consumer sends a VscMaturedPacket to the provider
+    /// * the provider receives the VscMaturedPacket
     run HappyPathTest: bool = { 
         init.then(
             all {
@@ -327,7 +327,7 @@ module CCVDefaultStateMachine {
                     "consumer2" -> List(),
                     "consumer3" -> List()
                 )),
-                assert(currentState.providerState.sentVSCPackets == Map(
+                assert(currentState.providerState.sentVscPackets == Map(
                     "consumer1" -> List(),
                     "consumer2" -> List(),
                     "consumer3" -> List()
@@ -354,7 +354,7 @@ module CCVDefaultStateMachine {
                     // the validator set on the provider was entered into the history
                     assert(currentState.providerState.chainState.votingPowerHistory == List(InitialValidatorSet.put("node1", 50), InitialValidatorSet)),
                     // deliver the packet
-                    DeliverVSCPacket("consumer1")
+                    DeliverVscPacket("consumer1")
                 }
             )
             .then(
@@ -380,7 +380,7 @@ module CCVDefaultStateMachine {
                     // it was removed from the maturationTimes
                     assert(currentState.consumerStates.get("consumer1").maturationTimes.keys().size() == 0),
                     // receive the packet on the provider
-                    DeliverVSCMaturedPacket("consumer1")
+                    DeliverVscMaturedPacket("consumer1")
                 }
             )
             .then(
@@ -395,8 +395,8 @@ module CCVDefaultStateMachine {
             )
         }
 
-    /// a manual test case for the SameVSCPacketsInv, since it needs very specific behaviour to even apply.
-    run SameVSCPacketsManualTest =
+    /// a manual test case for the SameVscPacketsInv, since it needs very specific behaviour to even apply.
+    run SameVscPacketsManualTest =
         init.then(
             // start all consumers except for consumer3
             EndAndBeginBlockForProvider(1 * Second, Set("consumer1", "consumer2"), Set())
@@ -408,10 +408,10 @@ module CCVDefaultStateMachine {
             EndAndBeginBlockForProvider(1 * Second, Set(), Set())
         ).then(
             // deliver the packets
-            DeliverVSCPacket("consumer1")
+            DeliverVscPacket("consumer1")
         ).then(
             // deliver to consumer2
-            DeliverVSCPacket("consumer2")
+            DeliverVscPacket("consumer2")
         ).then(
             // start consumer3
             EndAndBeginBlockForProvider(1 * Second, Set("consumer3"), Set())
@@ -423,25 +423,25 @@ module CCVDefaultStateMachine {
             EndAndBeginBlockForProvider(1 * Second, Set(), Set())
         ).then(
             //deliver to consumer1
-            DeliverVSCPacket("consumer1")
+            DeliverVscPacket("consumer1")
         ).then(
             // deliver to consumer2
-            DeliverVSCPacket("consumer2")
+            DeliverVscPacket("consumer2")
         ).then(
             // deliver to consumer3
-            DeliverVSCPacket("consumer3")
+            DeliverVscPacket("consumer3")
         )
         .then(
-            // the SameVSCPacketInv should hold here
+            // the SameVscPacketInv should hold here
             all {
-                assert(SameVSCPacketsInv),
+                assert(SameVscPacketsInv),
                 // action does not matter, but needed to have uniform effect
                 step
             }
         )
 
     // a manual test for the EventuallyMatureOnProvider invariant
-    run VSCTimeoutManualTest =
+    run VscTimeoutManualTest =
         init
         .then(
             // start all consumer chains
@@ -456,7 +456,7 @@ module CCVDefaultStateMachine {
             EndAndBeginBlockForProvider(1 * Second, Set(), Set())
         )
         .then(
-            // advance time on provider by VSCTimeout + 1 Second
+            // advance time on provider by VscTimeout + 1 Second
             EndAndBeginBlockForProvider(VscTimeout + 5 * Second, Set(), Set())
         )
         // .then(
diff --git a/tests/difference/core/quint_model/ccv_test.qnt b/tests/difference/core/quint_model/ccv_test.qnt
index 7f3e6a69fd..9638aa2818 100644
--- a/tests/difference/core/quint_model/ccv_test.qnt
+++ b/tests/difference/core/quint_model/ccv_test.qnt
@@ -119,9 +119,9 @@ module CCVTest {
             )
         )
     ).with(
-        // put an entry into sentVSCPacket on the provider that corresponds to the packet we put on the consumer
+        // put an entry into sentVscPacket on the provider that corresponds to the packet we put on the consumer
         "providerState", _DeliverPacketToProvider_TestState.providerState.with(
-            "sentVSCPackets", _DeliverPacketToProvider_TestState.providerState.sentVSCPackets.put(
+            "sentVscPackets", _DeliverPacketToProvider_TestState.providerState.sentVscPackets.put(
                 "sender", List({
                     id: 0,
                     validatorSet: _DeliverPacketToProvider_TestState.providerState.chainState.currentValidatorSet,

From dc7e687535bf6b01b4e6b8e65b0e2b7f86b4ad38 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Tue, 10 Oct 2023 12:57:25 +0200
Subject: [PATCH 57/80] Rename VSC to Vsc

---
 tests/difference/core/quint_model/README.md | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index bfd7795d02..9213b091c3 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -40,19 +40,19 @@ Each invariant takes about a minute to run.
 Invariants are as follows:
 - [X] ValidatorUpdatesArePropagatedInv: When a validator power update is comitted on chain, a packet containing that change in voting power is sent to all running consumers.
 - [X] ValidatorSetHasExistedInv: Every validator set on consumer chains is/was a validator set on the provider.
-- [X] SameVSCPacketsInv: Ensure that consumer chains receive the same VSCPackets in the same order.
+- [X] SameVscPacketsInv: Ensure that consumer chains receive the same VscPackets in the same order.
 Because of nuances with starting/stopping consumers, this invariant is not as simple as it sounds. In detail:
 For consumer chains c1, c2, if both c1 and c2 received a packet p1 sent at t1 and a packet p2 sent at t2,
 then both have received ALL packets that were sent between t1 and t2 in the same order.
 - [X] MatureOnTimeInv: For every ValidatorSetChangePacket received by a consumer chain at 
-time t, a MaturedVSCPacket is sent back to the provider in the first block 
+time t, a MaturedVscPacket is sent back to the provider in the first block 
 with a timestamp >= t + UnbondingPeriod on that consumer.
-- [X] EventuallyMatureOnProviderInv: If we send a VSCPacket, this is eventually responded to by all consumers
+- [X] EventuallyMatureOnProviderInv: If we send a VscPacket, this is eventually responded to by all consumers
 that were running at the time the packet was sent (and are still running).
 
 Invariants can also be model-checked by Apalache, using this command:
 ```
-quint verify --invariant ValidatorUpdatesArePropagatedInv,ValidatorSetHasExistedInv,SameVSCPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv \
+quint verify --invariant ValidatorUpdatesArePropagatedInv,ValidatorSetHasExistedInv,SameVscPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv \
 --main CCVDefaultStateMachine ccv_statemachine.qnt
 ```
 
@@ -68,5 +68,5 @@ The available sanity checks are:
 - CanRunConsumer
 - CanStopConsumer
 - CanTimeoutConsumer
-- CanSendVSCPackets
-- CanSendVSCMaturedPackets
\ No newline at end of file
+- CanSendVscPackets
+- CanSendVscMaturedPackets
\ No newline at end of file

From 728b02460c590cfea0d6645f68b02f1e9247ed58 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Tue, 10 Oct 2023 15:17:27 +0200
Subject: [PATCH 58/80] Return plain ProtocolState in cases where no error is
 returned anyways

---
 tests/difference/core/quint_model/ccv.qnt | 28 ++++++-----------------
 1 file changed, 7 insertions(+), 21 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index fe605d450b..b4523a8c23 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -250,7 +250,7 @@ module CCV {
     // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
     // e.g. via undelegations, or delegations, ...
     pure def votingPowerChange(currentState: ProtocolState, validator: Node, amount: int): Result = {
-            if (amount < 0) {
+            if (amount <= 0) {
                 Err("Voting power changes must be positive")
             } else {
                 pure val currentValidatorSet = currentState.providerState.chainState.currentValidatorSet
@@ -311,14 +311,7 @@ module CCV {
                 if (result.hasError) {
                     (Err(result.error.message), false)
                 } else {
-                    val result2 = removeOutstandingPacketFromConsumer(tmpState, sender)
-                    val tmpState2 = result2.newState
-                    val err2 = result2.error
-                    if (result2.hasError) {
-                        (Err(err2.message), false)
-                    } else {
-                        (Ok(tmpState2), false) // false because the packet did not time out
-                    }
+                    (Ok(removeOutstandingPacketFromConsumer(tmpState, sender)), false) // false because the packet did not time out
                 }
             }
         }
@@ -367,14 +360,7 @@ module CCV {
                 if (result.hasError) {
                     (Err(result.error.message), false)
                 } else {
-                    val result2 = removeOutstandingPacketFromProvider(tmpState, receiver)
-                    val tmpState2 = result2.newState
-                    val err2 = result2.error
-                    if (result2.hasError) {
-                        (Err(err2.message), false)
-                    } else {
-                        (Ok(tmpState2), false) // false because the packet did not time out
-                    }
+                    (Ok(removeOutstandingPacketFromProvider(tmpState, receiver)), false) // false because the packet did not time out
                 }
             }
         }
@@ -749,7 +735,7 @@ module CCV {
 
     // removes the oldest outstanding packet from the consumer. on-chain, this would happen when the packet is acknowledged.
     // only the oldest packet can be removed, since we model ordered channels.
-    pure def removeOutstandingPacketFromConsumer(currentState: ProtocolState, sender: Chain): Result = {
+    pure def removeOutstandingPacketFromConsumer(currentState: ProtocolState, sender: Chain): ProtocolState = {
         val currentOutstandingPackets = currentState.consumerStates.get(sender).outstandingPacketsToProvider
         val newOutstandingPackets = currentOutstandingPackets.tail()
         val newConsumerState = currentState.consumerStates.get(sender).with(
@@ -759,13 +745,13 @@ module CCV {
         val newState = currentState.with(
             "consumerStates", newConsumerStates
         )
-        Ok(newState)
+        newState
     }
 
     // removes the oldest outstanding packet (to the given consumer) from the provider.
     // on-chain, this would happen when the packet is acknowledged.
     // only the oldest packet can be removed, since we model ordered channels.
-    pure def removeOutstandingPacketFromProvider(currentState: ProtocolState, receiver: Chain): Result = {
+    pure def removeOutstandingPacketFromProvider(currentState: ProtocolState, receiver: Chain): ProtocolState = {
         val currentOutstandingPackets = currentState.providerState.outstandingPacketsToConsumer.get(receiver)
         val newOutstandingPackets = currentOutstandingPackets.tail()
         val newProviderState = currentState.providerState.with(
@@ -775,7 +761,7 @@ module CCV {
         val newState = currentState.with(
             "providerState", newProviderState
         )
-        Ok(newState)
+        newState
     }
 
     // Updates the given oldValidatorSet by setting the validator to newVotingPower.

From 641d84506222c949e03f43fcaba59ec5ed6b0b96 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Tue, 10 Oct 2023 15:36:47 +0200
Subject: [PATCH 59/80] Remove unused defs

---
 tests/difference/core/quint_model/ccv.qnt     | 48 +++++--------------
 .../core/quint_model/ccv_statemachine.qnt     |  8 ++--
 .../difference/core/quint_model/ccv_test.qnt  | 10 ++--
 3 files changed, 21 insertions(+), 45 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index b4523a8c23..ecd97521b3 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -78,7 +78,7 @@ module CCVTypes {
             providerValidatorSetChangedInThisBlock: bool,
 
             // stores, for each consumer chain, its current status -
-            // unused, running, or stopped
+            // not consumer, running, or stopped
             consumerStatus: Chain -> str,
 
             // a monotonic strictly increasing and positive ID that is used
@@ -132,7 +132,7 @@ module CCVTypes {
         providerState: ProviderState,
         // the state of each consumer chain.
         // note that we assume that this contains all consumer chains that may ever exist,
-        // and consumer chains that are currently not running will have providerState.consumerStatus == UNUSED or STOPPED.
+        // and consumer chains that are currently not running will have providerState.consumerStatus == NOT_CONSUMER or STOPPED.
         consumerStates: Chain -> ConsumerState
     }
 
@@ -195,7 +195,7 @@ module CCVTypes {
     pure val STOPPED = "stopped" // the chain was once a consumer chain, but has been voluntarily dropped by the provider.
     pure val TIMEDOUT = "timedout" // the chain has timed out and was dropped by the provider. This is only used for involuntary drops.
     pure val RUNNING = "running" // the chain is currently a consumer chain. Running chains are those that get sent VscPackets.
-    pure val UNUSED = "unused" // the chain has never been a consumer chain, and is available to become one.
+    pure val NOT_CONSUMER = "not consumer" // the chain has never been a consumer chain, and is available to become one.
     // When a chain is dropped, it cannot become a consumer again - we assume that would be done by another consumer becoming running.
 
     // the provider chain.
@@ -376,7 +376,7 @@ module CCV {
         // by how much the timestamp should be advanced,
         // i.e. the timestamp for the next block is oldTimestamp + timeAdvancement
         timeAdvancement: Time,
-        // a set of consumers that were unused before, but should be set to running now.
+        // a set of consumers that were not consumers before, but should be set to running now.
         consumersToStart: Set[Chain],
         // a set of consumers that were running before, but should be set to stopped now.
         // This argument only needs to contain "voluntary" stops -
@@ -500,29 +500,6 @@ module CCV {
     // which do not hold the core logic of the protocol, but are still part of it
     // ===================
 
-    // Get the running consumer that is furthest away from the provider in terms of timestamp.
-    pure def getFurthestConsumer(currentState: ProtocolState): Chain = {
-        val furthestConsumer = getRunningConsumers(currentState.providerState).MaxBy(
-            consumer => abs(
-                currentState.providerState.chainState.lastTimestamp -
-                currentState.consumerStates.get(consumer).chainState.lastTimestamp
-            )
-        )
-        furthestConsumer
-    }
-
-    pure def getRunningConsumersFromMap(consumerStatus: Chain -> str): Set[Chain] = {
-        consumerStatus.keys().filter(
-            chain => consumerStatus.get(chain) == RUNNING
-        )
-    }
-
-    pure def getStoppedConsumersFromMap(consumerStatus: Chain -> str): Set[Chain] = {
-        consumerStatus.keys().filter(
-            chain => consumerStatus.get(chain) == STOPPED
-        )
-    }
-
     // Returns the new ConsumerStatusMap according to the consumers to stop
     // and the consumers to time out.
     // If a consumer is both stopped and timed out, it will be timed out.
@@ -540,7 +517,6 @@ module CCV {
                 if (consumersToStop.exclude(runningConsumers).size() > 0) {
                     (currentConsumerStatusMap, "Cannot stop a consumer that is not running")
                 } else {
-                    // if a consumer is started, it must be unused
                     val newConsumerStatusMap = currentConsumerStatusMap.keys().mapBy(
                         (chain) => 
                         if (consumersToTimeout.contains(chain)) {
@@ -561,15 +537,15 @@ module CCV {
     pure def startConsumers(
         currentConsumerStatusMap: Chain -> str,
         consumersToStart: Set[Chain]): (Chain -> str, str) = {
-            val unusedConsumers = currentConsumerStatusMap.keys().filter(
-                chain => currentConsumerStatusMap.get(chain) == UNUSED
+            val nonConsumers = currentConsumerStatusMap.keys().filter(
+                chain => currentConsumerStatusMap.get(chain) == NOT_CONSUMER
             )
             // if a consumer is both started and stopped, this is an error
                 // if a consumer is stopped, it must be running
-                if (consumersToStart.exclude(unusedConsumers).size() > 0) {
-                    (currentConsumerStatusMap, "cannot start a consumer that is not unused")
+                if (consumersToStart.exclude(nonConsumers).size() > 0) {
+                    (currentConsumerStatusMap, "cannot start a consumer that is stopped or already a consumer")
                 } else {
-                    // if a consumer is started, it must be unused
+                    // if a consumer is started, it must be a nonconsumer
                     val newConsumerStatusMap = currentConsumerStatusMap.keys().mapBy(
                         (chain) => 
                         if (consumersToStart.contains(chain)) {
@@ -799,10 +775,10 @@ module CCV {
         )
     }
 
-    // Returns the set of all consumer chains that currently have the status UNUSED.
-    pure def getUnusedConsumers(providerState: ProviderState): Set[Chain] = {
+    // Returns the set of all consumer chains that currently have the status NOT_CONSUMER.
+    pure def getNonConsumers(providerState: ProviderState): Set[Chain] = {
         providerState.consumerStatus.keys().filter(
-            chain => providerState.consumerStatus.get(chain) == UNUSED
+            chain => providerState.consumerStatus.get(chain) == NOT_CONSUMER
         )
     }
 
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index b75d2b2d3e..bc7ec44fbd 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -31,7 +31,7 @@ module CCVDefaultStateMachine {
         val consumerStates = ConsumerChains.mapBy(chain => GetEmptyConsumerState)
         val providerStateWithConsumers = providerState.with(
             "consumerStatus", 
-            ConsumerChains.mapBy(chain => UNUSED)
+            ConsumerChains.mapBy(chain => NOT_CONSUMER)
         ).with(
             "outstandingPacketsToConsumer", 
             ConsumerChains.mapBy(chain => List())
@@ -318,9 +318,9 @@ module CCVDefaultStateMachine {
         init.then(
             all {
                 assert(currentState.providerState.consumerStatus == Map(
-                    "consumer1" -> UNUSED,
-                    "consumer2" -> UNUSED,
-                    "consumer3" -> UNUSED
+                    "consumer1" -> NOT_CONSUMER,
+                    "consumer2" -> NOT_CONSUMER,
+                    "consumer3" -> NOT_CONSUMER
                 )),
                 assert(currentState.providerState.outstandingPacketsToConsumer == Map(
                     "consumer1" -> List(),
diff --git a/tests/difference/core/quint_model/ccv_test.qnt b/tests/difference/core/quint_model/ccv_test.qnt
index 9638aa2818..9493e69d6a 100644
--- a/tests/difference/core/quint_model/ccv_test.qnt
+++ b/tests/difference/core/quint_model/ccv_test.qnt
@@ -189,7 +189,7 @@ module CCVTest {
     run ConsumerStatusMapHappyPathTest = 
     {
         val currentConsumerStatusMap = Map(
-            "chain1" -> UNUSED,
+            "chain1" -> NOT_CONSUMER,
             "chain2" -> RUNNING,
             "chain3" -> STOPPED
         )
@@ -208,7 +208,7 @@ module CCVTest {
     run ConsumerStatusMapAlreadyRunningTest =
     {
         val currentConsumerStatusMap = Map(
-            "chain1" -> UNUSED,
+            "chain1" -> NOT_CONSUMER,
             "chain2" -> RUNNING,
             "chain3" -> STOPPED
         )
@@ -218,13 +218,13 @@ module CCVTest {
             Set("chain3"),
             Set()
         )
-        res._2 == "cannot start a consumer that is not unused"
+        res._2 == "cannot start a consumer that is stopped or running"
     }
 
     run ConsumerStatusMapAlreadyStoppedTest =
     {
         val currentConsumerStatusMap = Map(
-            "chain1" -> UNUSED,
+            "chain1" -> NOT_CONSUMER,
             "chain2" -> RUNNING,
             "chain3" -> STOPPED
         )
@@ -240,7 +240,7 @@ module CCVTest {
     run ChainBothInStartAndStopTest =
     {
         val currentConsumerStatusMap = Map(
-            "chain1" -> UNUSED,
+            "chain1" -> NOT_CONSUMER,
             "chain2" -> RUNNING,
             "chain3" -> STOPPED
         )

From c2aa6d049e5804eb29ef68ce51a191aa9f904ac8 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Tue, 10 Oct 2023 15:54:11 +0200
Subject: [PATCH 60/80] Fix indentation

---
 tests/difference/core/quint_model/ccv.qnt     | 63 +++++++++----------
 .../core/quint_model/ccv_statemachine.qnt     |  4 +-
 2 files changed, 32 insertions(+), 35 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index ecd97521b3..c7f1e0c566 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -512,24 +512,23 @@ module CCV {
             val runningConsumers = currentConsumerStatusMap.keys().filter(
                 chain => currentConsumerStatusMap.get(chain) == RUNNING
             )
-            // if a consumer is both started and stopped, this is an error
-                // if a consumer is stopped, it must be running
-                if (consumersToStop.exclude(runningConsumers).size() > 0) {
-                    (currentConsumerStatusMap, "Cannot stop a consumer that is not running")
-                } else {
-                    val newConsumerStatusMap = currentConsumerStatusMap.keys().mapBy(
-                        (chain) => 
-                        if (consumersToTimeout.contains(chain)) {
-                            TIMEDOUT
-                        } else if (consumersToStop.contains(chain)) {
-                            STOPPED
-                        } else {
-                            currentConsumerStatusMap.get(chain)
-                        }
-                    )
-                    (newConsumerStatusMap, "")
-                }
+            // all consumers to stop must be running right now, else we have an error
+            if (consumersToStop.exclude(runningConsumers).size() > 0) {
+                (currentConsumerStatusMap, "Cannot stop a consumer that is not running")
+            } else {
+                val newConsumerStatusMap = currentConsumerStatusMap.keys().mapBy(
+                    (chain) => 
+                    if (consumersToTimeout.contains(chain)) {
+                        TIMEDOUT
+                    } else if (consumersToStop.contains(chain)) {
+                        STOPPED
+                    } else {
+                        currentConsumerStatusMap.get(chain)
+                    }
+                )
+                (newConsumerStatusMap, "")
             }
+        }
         
     // Returns the new ConsumerStatusMap according to the consumers to start.
     // The second return is an error string: If it is not equal to "",
@@ -540,23 +539,21 @@ module CCV {
             val nonConsumers = currentConsumerStatusMap.keys().filter(
                 chain => currentConsumerStatusMap.get(chain) == NOT_CONSUMER
             )
-            // if a consumer is both started and stopped, this is an error
-                // if a consumer is stopped, it must be running
-                if (consumersToStart.exclude(nonConsumers).size() > 0) {
-                    (currentConsumerStatusMap, "cannot start a consumer that is stopped or already a consumer")
-                } else {
-                    // if a consumer is started, it must be a nonconsumer
-                    val newConsumerStatusMap = currentConsumerStatusMap.keys().mapBy(
-                        (chain) => 
-                        if (consumersToStart.contains(chain)) {
-                            RUNNING
-                        } else {
-                            currentConsumerStatusMap.get(chain)
-                        }
-                    )
-                    (newConsumerStatusMap, "")
-                }
+            // all consumers to start must be nonConsumers right now, otherwise we have an error
+            if (consumersToStart.exclude(nonConsumers).size() > 0) {
+                (currentConsumerStatusMap, "cannot start a consumer that is stopped or already a consumer")
+            } else {
+                val newConsumerStatusMap = currentConsumerStatusMap.keys().mapBy(
+                    (chain) => 
+                    if (consumersToStart.contains(chain)) {
+                        RUNNING
+                    } else {
+                        currentConsumerStatusMap.get(chain)
+                    }
+                )
+                (newConsumerStatusMap, "")
             }
+        }
 
     pure def StartStopConsumers(
         currentConsumerStatusMap: Chain -> str,
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index bc7ec44fbd..5b75716a5f 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -24,7 +24,7 @@ module CCVDefaultStateMachine {
     // some utility stateful vals to make invariants easier to define
     val providerValidatorHistory = currentState.providerState.chainState.votingPowerHistory
     val runningConsumers = getRunningConsumers(currentState.providerState)
-    val unusedConsumers = getUnusedConsumers(currentState.providerState)
+    val nonConsumers = getNonConsumers(currentState.providerState)
 
     action init: bool = all {
         val providerState = GetEmptyProviderState
@@ -124,7 +124,7 @@ module CCVDefaultStateMachine {
         },
 
         val consumerStatus = currentState.providerState.consumerStatus
-        nondet consumersToStart = oneOf(unusedConsumers.powerset())
+        nondet consumersToStart = oneOf(nonConsumers.powerset())
         nondet consumersToStop = oneOf(runningConsumers.powerset())
         nondet timeAdvancement = oneOf(timeAdvancements)
         EndAndBeginBlockForProvider(timeAdvancement, consumersToStart, consumersToStop),

From 75b1e111aec18faaacc73c1ef030924c7f8af239 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Tue, 10 Oct 2023 15:54:48 +0200
Subject: [PATCH 61/80] Rename to isRunningConsumer

---
 tests/difference/core/quint_model/ccv.qnt | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index c7f1e0c566..ea6c5058fa 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -275,7 +275,7 @@ module CCV {
     // that indicates whether the consumer timed out or not.
     // If the result has an error, the second return should be ignored.
     pure def deliverPacketToProvider(currentState: ProtocolState, sender: Chain): (Result, bool) = {
-        if (not(isCurrentlyConsumer(sender, currentState.providerState))) {
+        if (not(isRunningConsumer(sender, currentState.providerState))) {
             (Err("Sender is not currently a consumer - must have 'running' status!"), false)
         } else if (length(currentState.consumerStates.get(sender).outstandingPacketsToProvider) == 0) {
             (Err("No outstanding packets to deliver"), false)
@@ -325,7 +325,7 @@ module CCV {
     // that indicates whether the consumer timed out or not.
     // If the result has an error, the second return should be ignored.
     pure def deliverPacketToConsumer(currentState: ProtocolState, receiver: Chain): (Result, bool) = {
-        if (not(isCurrentlyConsumer(receiver, currentState.providerState))) {
+        if (not(isRunningConsumer(receiver, currentState.providerState))) {
             (Err("Receiver is not currently a consumer - must have 'running' status!"), false)
         } else if (length(currentState.providerState.outstandingPacketsToConsumer.get(receiver)) == 0) {
             (Err("No outstanding packets to deliver"), false)
@@ -613,7 +613,7 @@ module CCV {
             (consumer) => 
             // if validator set changed and the consumer is running, send a packet
             if (providerState.providerValidatorSetChangedInThisBlock and 
-                isCurrentlyConsumer(consumer, providerState)) {
+                isRunningConsumer(consumer, providerState)) {
                 List({
                         id: providerState.runningVscId,
                         validatorSet: providerState.chainState.currentValidatorSet,
@@ -654,7 +654,7 @@ module CCV {
     // but the candidate that would be put into the block if it ended now)
     // and store the maturation time for the packet.
     pure def recvPacketOnConsumer(currentState: ProtocolState, receiver: Chain, packet: VscPacket): Result = {
-        if(not(isCurrentlyConsumer(receiver, currentState.providerState))) {
+        if(not(isRunningConsumer(receiver, currentState.providerState))) {
             Err("Receiver is not currently a consumer - must have 'running' status!")
         } else {
             // update the running validator set, but not the history yet,
@@ -686,7 +686,7 @@ module CCV {
     // receives a given packet on the provider. The arguments are the consumer chain that sent the packet, and the packet itself.
     // To receive a packet, add it to the list of received maturations.
     pure def recvPacketOnProvider(currentState: ProtocolState, sender: Chain, packet: VscMaturedPacket): Result = {
-        if (not(isCurrentlyConsumer(sender, currentState.providerState))) {
+        if (not(isRunningConsumer(sender, currentState.providerState))) {
             Err("Sender is not currently a consumer - must have 'running' status!")
         } else if (currentState.providerState.sentVscPackets.get(sender).head().id != packet.id) {
             // the packet is not the oldest sentVscPacket, something went wrong
@@ -760,7 +760,7 @@ module CCV {
     }
 
     // Returns true if the given chain is currently a running consumer, false otherwise.
-    pure def isCurrentlyConsumer(chain: Chain, providerState: ProviderState): bool = {
+    pure def isRunningConsumer(chain: Chain, providerState: ProviderState): bool = {
         val status = providerState.consumerStatus.get(chain)
         status == RUNNING
     }
@@ -785,7 +785,7 @@ module CCV {
     // or false otherwise.
     pure def TimeoutDueToVscTimeout(currentState: ProtocolState, consumer: Chain): (bool, str) =
         // check for errors: the consumer is not running
-        if (not(isCurrentlyConsumer(consumer, currentState.providerState))) {
+        if (not(isRunningConsumer(consumer, currentState.providerState))) {
             (false, "Consumer is not currently a consumer - must have 'running' status!")
         } else {
             val providerState = currentState.providerState

From f46554b1640db24625df4399d95c00921f5f50b3 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Tue, 10 Oct 2023 16:00:10 +0200
Subject: [PATCH 62/80] Unify naming for extraSpells

---
 tests/difference/core/quint_model/ccv.qnt     |  2 +-
 .../core/quint_model/ccv_statemachine.qnt     |  4 +-
 .../quint_model/libraries/extraSpells.qnt     | 54 ++++++-------------
 3 files changed, 19 insertions(+), 41 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index ea6c5058fa..dd9107695d 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -821,7 +821,7 @@ module CCV {
         CcvTimeout.keys().forall(chain => CcvTimeout.get(chain) > 0)
 
     run CcvTimeoutLargerThanUnbondingPeriodTest =
-        CcvTimeout.get(PROVIDER_CHAIN) > UnbondingPeriodPerChain.Values().Max()
+        CcvTimeout.get(PROVIDER_CHAIN) > UnbondingPeriodPerChain.values().max()
 
     run ProviderIsNotAConsumerTest =
         not(ConsumerChains.contains(PROVIDER_CHAIN))
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index 5b75716a5f..a15ed2c830 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -201,8 +201,8 @@ module CCVDefaultStateMachine {
                     if (commonPackets.size() == 0) {
                         true // they don't share any packets, so nothing to check
                     } else {
-                        val newestCommonPacket = commonPackets.MaxBy(packet => packet.sendingTime)
-                        val oldestCommonPacket = commonPackets.MinBy(packet => packet.sendingTime)
+                        val newestCommonPacket = commonPackets.maxBy(packet => packet.sendingTime)
+                        val oldestCommonPacket = commonPackets.minBy(packet => packet.sendingTime)
                         // get all packets sent between the oldest and newest common packet
                         val packetsBetween1 = packets1.select(
                             packet => packet.sendingTime >= oldestCommonPacket.sendingTime and packet.sendingTime <= newestCommonPacket.sendingTime
diff --git a/tests/difference/core/quint_model/libraries/extraSpells.qnt b/tests/difference/core/quint_model/libraries/extraSpells.qnt
index 24f37d919d..414ce8f949 100644
--- a/tests/difference/core/quint_model/libraries/extraSpells.qnt
+++ b/tests/difference/core/quint_model/libraries/extraSpells.qnt
@@ -37,24 +37,6 @@ module extraSpells {
     assert(requires(4 < 3, "false: 4 < 3") == "false: 4 < 3"),
   }
 
-
-  /// Compute the maximum of two integers.
-  ///
-  /// - @param __i first integer
-  /// - @param __j second integer
-  /// - @returns the maximum of __i and __j
-  pure def max(__i: int, __j: int): int = {
-    if (__i > __j) __i else __j
-  }
-
-  run maxTest = all {
-    assert(max(3, 4) == 4),
-    assert(max(6, 3) == 6),
-    assert(max(10, 10) == 10),
-    assert(max(-3, -5) == -3),
-    assert(max(-5, -3) == -3),
-  }
-
   /// Compute the absolute value of an integer
   ///
   /// - @param __i : an integer whose absolute value we are interested in
@@ -178,35 +160,31 @@ module extraSpells {
         __set.union(Set(elem))
     }
 
-    pure def Values(__map: a -> b): Set[b] = {
+    pure def values(__map: a -> b): Set[b] = {
         __map.keys().fold(Set(), (__s, __k) => __s.add(__map.get(__k)))
     }
-    run ValuesTest =
+    run valuesTest =
     all {
-        assert(Values(Map(1 -> 2, 3 -> 4)) == Set(2, 4)),
-        assert(Values(Map()) == Set())
+        assert(values(Map(1 -> 2, 3 -> 4)) == Set(2, 4)),
+        assert(values(Map()) == Set())
     }
 
     // Returns the maximal element of the set.
     // If the set is empty, the function call will fail at runtime.
-    pure def Max(__set: Set[int]): int = {
-        __set.fold(oneOf(__set), (__m, __e) => max(__m, __e))
-    }
+    pure def max(__set: Set[int]): int = maxBy(__set, __a => __a)
 
-    run MaxTest =
+    run maxTest =
     all {
-        assert(Max(Set(1, 2, 3)) == 3),
+        assert(max(Set(1, 2, 3)) == 3),
     }
 
     // Returns the minimal element of the set.
     // If the set is empty, the function call will fail at runtime.
-    pure def Min(__set: Set[int]): int = {
-        __set.fold(oneOf(__set), (__m, __e) => if(__m < __e) __m else __e)
-    }
+    pure def min(__set: Set[int]): int = minBy(__set, __a => __a)
 
-    run MinTest =
+    run minTest =
     all {
-        assert(Min(Set(1, 2, 3)) == 1),
+        assert(min(Set(1, 2, 3)) == 1),
     }
 
     pure def HasSubsequence(__this: List[a], __other: List[a]): bool = {
@@ -236,21 +214,21 @@ module extraSpells {
     // Returns the maximum element of a set, according to a given function.
     // If two elements are equally large, an arbitrary one will be returned.
     // If the set is empty, the function call will fail at runtime.
-    pure def MaxBy(__set: Set[a], __f: a => int): a = {
+    pure def maxBy(__set: Set[a], __f: a => int): a = {
       __set.fold(
         oneOf(__set),
         (__m, __e) => if(__f(__m) > __f(__e)) {__m } else {__e}
       )
     }
 
-    run MaxByTest =
+    run maxByTest =
     all {
-      assert(MaxBy(Set(1, 2, 3), __x => __x) == 3),
-      assert(MaxBy(Set(1, 2, 3), __x => -__x) == 1),
+      assert(maxBy(Set(1, 2, 3), __x => __x) == 3),
+      assert(maxBy(Set(1, 2, 3), __x => -__x) == 1),
     }
 
-    // Like MaxBy, but returns the minimum element.
-    pure def MinBy(__set: Set[a], __f: a => int): a = {
+    // Like maxBy, but returns the minimum element.
+    pure def minBy(__set: Set[a], __f: a => int): a = {
       __set.fold(
         oneOf(__set),
         (__m, __e) => if(__f(__m) < __f(__e)) {__m } else {__e}

From 36308469de839dda0b808406385846eb630ff9ed Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Tue, 10 Oct 2023 16:28:09 +0200
Subject: [PATCH 63/80] Remove HasSubsequence

---
 .../quint_model/libraries/extraSpells.qnt     | 24 -------------------
 1 file changed, 24 deletions(-)

diff --git a/tests/difference/core/quint_model/libraries/extraSpells.qnt b/tests/difference/core/quint_model/libraries/extraSpells.qnt
index 414ce8f949..cc20c17aef 100644
--- a/tests/difference/core/quint_model/libraries/extraSpells.qnt
+++ b/tests/difference/core/quint_model/libraries/extraSpells.qnt
@@ -187,30 +187,6 @@ module extraSpells {
         assert(min(Set(1, 2, 3)) == 1),
     }
 
-    pure def HasSubsequence(__this: List[a], __other: List[a]): bool = {
-      if(__other.length() > __this.length()) {
-        false
-      } else {
-        0.to(__this.length() - __other.length()) // go through all possible starting points of __other in __this
-        .exists(
-          __start => __this.slice(__start, __start + __other.length()) == __other
-        )
-      }
-    }
-
-    run HasSubsequenceTest =
-    all {
-      assert(List(1, 2, 3, 4).HasSubsequence(List(1, 2))),
-      assert(List(1, 2, 3, 4).HasSubsequence(List(2, 3))),
-      assert(List(1, 2, 3, 4).HasSubsequence(List(3, 4))),
-      assert(List(1, 2, 3, 4).HasSubsequence(List(1, 2, 3))),
-      assert(not(List(1, 2, 3, 4).HasSubsequence(List(1, 3)))),
-      assert(not(List().HasSubsequence(List(1)))),
-      assert(List().HasSubsequence(List())),
-      assert(List(1).HasSubsequence(List())),
-      assert(List(1).HasSubsequence(List(1))),
-    }
-
     // Returns the maximum element of a set, according to a given function.
     // If two elements are equally large, an arbitrary one will be returned.
     // If the set is empty, the function call will fail at runtime.

From 90f6652ce1584fa4f02dd6c6bc53597b3b86c178 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Tue, 10 Oct 2023 16:47:39 +0200
Subject: [PATCH 64/80] Run tests before running invariants

---
 tests/difference/core/quint_model/run_invariants.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/run_invariants.sh b/tests/difference/core/quint_model/run_invariants.sh
index 142095682f..5acd79e49c 100755
--- a/tests/difference/core/quint_model/run_invariants.sh
+++ b/tests/difference/core/quint_model/run_invariants.sh
@@ -1 +1,4 @@
-quint run --invariant "all{ValidatorUpdatesArePropagatedInv,ValidatorSetHasExistedInv,SameVSCPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv}" ccv_statemachine.qnt --main CCVDefaultStateMachine --max-steps 500 --max-samples 200 --out out.log
\ No newline at end of file
+#! /bin/sh
+
+quint test ccv_statemachine.qnt --main CCVDefaultStateMachine
+quint run --invariant "all{ValidatorUpdatesArePropagatedInv,ValidatorSetHasExistedInv,SameVscPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv}" ccv_statemachine.qnt --main CCVDefaultStateMachine --max-steps 500 --max-samples 200
\ No newline at end of file

From 13a32fcb5898d361105cd055600674b629b64000 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Wed, 11 Oct 2023 11:39:06 +0200
Subject: [PATCH 65/80] Rename modules to have same name as files

---
 tests/difference/core/quint_model/ccv.qnt     |   6 +-
 .../core/quint_model/ccv_statemachine.qnt     | 181 +++++++++++-------
 .../difference/core/quint_model/ccv_test.qnt  |   6 +-
 3 files changed, 114 insertions(+), 79 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index dd9107695d..2b975d6c53 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -1,5 +1,5 @@
 // -*- mode: Bluespec; -*-
-module CCVTypes {
+module ccv_types {
     import Time.* from "./libraries/Time"
 
     type Node = str
@@ -204,7 +204,7 @@ module CCVTypes {
     pure val PROVIDER_CHAIN = "provider"
 }
 
-module CCV {
+module ccv {
     // Implements the core logic of the cross-chain validation protocol.
 
     // Things that are not modelled:
@@ -222,7 +222,7 @@ module CCV {
     
     import Time.* from "./libraries/Time"
     import extraSpells.* from "./libraries/extraSpells"
-    import CCVTypes.*
+    import ccv_types.*
   
 
     // ===================
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index a15ed2c830..26e365a398 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -1,7 +1,7 @@
 // -*- mode: Bluespec; -*-
-module CCVDefaultStateMachine {
+module ccv_statemachine {
     // A basic state machine that utilizes the CCV protocol.
-    import CCVTypes.* from "./ccv"
+    import ccv_types.* from "./ccv"
     import Time.* from "./libraries/Time"
     import extraSpells.* from "./libraries/extraSpells"
 
@@ -13,13 +13,98 @@ module CCVDefaultStateMachine {
     pure val nodes = Set("node1", "node2", "node3", "node4", "node5", "node6", "node7", "node8", "node9", "node10")
     pure val InitialValidatorSet = nodes.mapBy(node => 100)
 
-    import CCV(VscTimeout = 5 * Week, CcvTimeout = ccvTimeouts, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = consumerChains).* from "./ccv"
+    import ccv(VscTimeout = 5 * Week, CcvTimeout = ccvTimeouts, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = consumerChains).* from "./ccv"
 
 
     var currentState: ProtocolState
+
+
+    pure def ACTIONS = Set(
+        "VotingPowerChange",
+        "DeliverVscPacket",
+        "DeliverVscMaturedPacket",
+        "EndAndBeginBlockForProvider",
+        "EndAndBeginBlockForConsumer"
+    )
+
+    // a type storing the parameters used in actions.
+    // this is used in the trace to store
+    // the name of the last action, plus the parameters we passed to it.
+    // Note: This type holds ALL parameters that are used in ANY action,
+    // so not all of these fields are relevant to each action.
+    type Action =
+        {
+            kind: str,
+            consumerChain: Chain,
+            timeAdvancement: Time,
+            consumersToStart: Set[Chain],
+            consumersToStop: Set[Chain],
+            validator: Node,
+            newVotingPower: int,
+        }
     
-    // bookkeeping
-    var trace: List[str]
+
+    var trace: List[Action]
+
+    // a few different values for time advancements.
+    // to keep the number of possible steps small, we only have a few different values.
+    // Roughly, 1s for very small advances (like between blocks),
+    // and then longer values for increasingly severe downtime scenarios.
+    // Note that these can still be combined, so in effect we can get all time advancements by any amount of seconds.
+    pure val timeAdvancements = Set(1 * Second, 1 * Day, 1 * Week, 4 * Week)
+
+    pure def emptyAction =
+            {
+                kind: "",
+                consumerChain: "",
+                timeAdvancement: 0 * Second,
+                consumersToStart: Set(),
+                consumersToStop: Set(),
+                validator: "",
+                newVotingPower: 0,
+            }
+
+    // step allows the most generic nondeterminism, in particular it becomes relatively likely
+    // that over a long enough runtime, all consumers would time out by mismatching their time advancements,
+    // and each endblock has a good chance to stop consumers, ...
+    // step is thus suited to test also unhappy paths.
+    action step = any {
+        all {
+            runningConsumers.size() > 0, // ensure there is a running consumer, otherwise this action does not make sense
+            nondet chain = oneOf(runningConsumers)
+            nondet timeAdvancement = oneOf(timeAdvancements)
+            EndAndBeginBlockForConsumer(chain, timeAdvancement),
+        },
+
+        val consumerStatus = currentState.providerState.consumerStatus
+        nondet consumersToStart = oneOf(nonConsumers.powerset())
+        nondet consumersToStop = oneOf(runningConsumers.powerset())
+        nondet timeAdvancement = oneOf(timeAdvancements)
+        EndAndBeginBlockForProvider(timeAdvancement, consumersToStart, consumersToStop),
+
+        nondet node = oneOf(nodes)
+        // very restricted set of voting powers. exact values are not important,
+        // and this keeps the state space smaller.
+        // 0 for getting a validator out of the validator set, and two non-zero values
+        nondet newVotingPower = oneOf(Set(0, 50, 100))
+        VotingPowerChange(node, newVotingPower),
+
+        // try to send a packet. we could filter by chains that can actually send,
+        // but it's probably not much faster than just trying and failing.
+        all {
+            runningConsumers.size() > 0, // ensure there is a running consumer, otherwise this action does not make sense
+            nondet sender = oneOf(runningConsumers)
+            DeliverVscMaturedPacket(sender),
+        },
+
+        // again, we could filter by chains that can actually receive,
+        // but it's probably not much faster than just trying and failing.
+        all {
+            runningConsumers.size() > 0, // ensure there is a running consumer, otherwise this action does not make sense
+            nondet recciver = oneOf(runningConsumers)
+            DeliverVscPacket(recciver),
+        },
+    }
 
     // some utility stateful vals to make invariants easier to define
     val providerValidatorHistory = currentState.providerState.chainState.votingPowerHistory
@@ -50,7 +135,7 @@ module CCVDefaultStateMachine {
             providerState: providerStateWithConsumers,
             consumerStates: consumerStates
         },
-        trace' = List("init")
+        trace' = List(emptyAction.with("kind", "init")),
     }
 
     action VotingPowerChange(validator: Node, newVotingPower: int): bool = 
@@ -58,7 +143,7 @@ module CCVDefaultStateMachine {
         all {
             result.hasError == false,
             currentState' = result.newState,
-            trace' = trace.append("VotingPowerChange")
+            trace' = trace.append(emptyAction.with("kind", "VotingPowerChange").with("validator", validator).with("newVotingPower", newVotingPower))
         }
 
     // The receiver receives the next outstanding VscPacket from the provider.
@@ -69,7 +154,7 @@ module CCVDefaultStateMachine {
         all {
             result.hasError == false,
             currentState' = result.newState,
-            trace' = trace.append("DeliverVscPacket")
+            trace' = trace.append(emptyAction.with("kind", "DeliverVscPacket").with("consumerChain", receiver))
         }
 
     // The provider receives the next outstanding VscMaturedPacket from the sender.
@@ -80,7 +165,7 @@ module CCVDefaultStateMachine {
         all {
             result.hasError == false,
             currentState' = result.newState,
-            trace' = trace.append("DeliverVscMaturedPacket")
+            trace' = trace.append(emptyAction.with("kind", "DeliverVscMaturedPacket").with("consumerChain", sender))
         }
 
     action EndAndBeginBlockForProvider(
@@ -91,7 +176,7 @@ module CCVDefaultStateMachine {
         all {
             result.hasError == false,
             currentState' = result.newState,
-            trace' = trace.append("EndAndBeginBlockForProvider")
+            trace' = trace.append(emptyAction.with("kind", "EndAndBeginBlockForProvider").with("timeAdvancement", timeAdvancement).with("consumersToStart", consumersToStart).with("consumersToStop", consumersToStop))
         }
 
     action EndAndBeginBlockForConsumer(
@@ -101,58 +186,9 @@ module CCVDefaultStateMachine {
         all {
             result.hasError == false,
             currentState' = result.newState,
-            trace' = trace.append("EndAndBeginBlockForConsumer")
+            trace' = trace.append(emptyAction.with("kind", "EndAndBeginBlockForConsumer").with("consumerChain", chain).with("timeAdvancement", timeAdvancement))
         }
 
-    // a few different values for time advancements.
-    // to keep the number of possible steps small, we only have a few different values.
-    // Roughly, 1s for very small advances (like between blocks),
-    // and then longer values for increasingly severe downtime scenarios.
-    // Note that these can still be combined, so in effect we can get all time advancements by any amount of seconds.
-    pure val timeAdvancements = Set(1 * Second, 1 * Day, 1 * Week, 4 * Week)
-
-    // step allows the most generic nondeterminism, in particular it becomes relatively likely
-    // that over a long enough runtime, all consumers would time out by mismatching their time advancements,
-    // and each endblock has a good chance to stop consumers, ...
-    // step is thus suited to test also unhappy paths.
-    action step = any {
-        all {
-            runningConsumers.size() > 0, // ensure there is a running consumer, otherwise this action does not make sense
-            nondet chain = oneOf(runningConsumers)
-            nondet timeAdvancement = oneOf(timeAdvancements)
-            EndAndBeginBlockForConsumer(chain, timeAdvancement),
-        },
-
-        val consumerStatus = currentState.providerState.consumerStatus
-        nondet consumersToStart = oneOf(nonConsumers.powerset())
-        nondet consumersToStop = oneOf(runningConsumers.powerset())
-        nondet timeAdvancement = oneOf(timeAdvancements)
-        EndAndBeginBlockForProvider(timeAdvancement, consumersToStart, consumersToStop),
-
-        nondet node = oneOf(nodes)
-        // very restricted set of voting powers. exact values are not important,
-        // and this keeps the state space smaller.
-        // 0 for getting a validator out of the validator set, and two non-zero values
-        nondet newVotingPower = oneOf(Set(0, 50, 100))
-        VotingPowerChange(node, newVotingPower),
-
-        // try to send a packet. we could filter by chains that can actually send,
-        // but it's probably not much faster than just trying and failing.
-        all {
-            runningConsumers.size() > 0, // ensure there is a running consumer, otherwise this action does not make sense
-            nondet sender = oneOf(runningConsumers)
-            DeliverVscMaturedPacket(sender),
-        },
-
-        // again, we could filter by chains that can actually receive,
-        // but it's probably not much faster than just trying and failing.
-        all {
-            runningConsumers.size() > 0, // ensure there is a running consumer, otherwise this action does not make sense
-            nondet recciver = oneOf(runningConsumers)
-            DeliverVscPacket(recciver),
-        },
-    }
-
     // ==================
     // INVARIANT CHECKS
     // ==================
@@ -169,7 +205,7 @@ module CCVDefaultStateMachine {
 
     // Any update in the power of a validator on the provider
     // MUST be present in a ValidatorSetChangePacket that is sent to all registered consumer chains
-    val ValUpdatePrecondition = trace[trace.length()-1] == "EndAndBeginBlockForProvider"
+    val ValUpdatePrecondition = trace[trace.length()-1].kind == "EndAndBeginBlockForProvider"
     val ValidatorUpdatesArePropagatedInv = 
         // when the provider has just entered a validator set into a block...
         if (ValUpdatePrecondition and currentState.providerState.providerValidatorSetChangedInThisBlock) {
@@ -389,8 +425,7 @@ module CCVDefaultStateMachine {
                     assert(currentState.providerState.receivedMaturations.size() == 1),
                     // the packet was removed from the consumer
                     assert(currentState.consumerStates.get("consumer1").outstandingPacketsToProvider.length() == 0),
-                    currentState' = currentState, // just so this still has an effect
-                    trace' = trace.append("HappyPathTest")
+                    VotingPowerChange("node1", 50) // just so this still has an effect
                 }
             )
         }
@@ -436,7 +471,7 @@ module CCVDefaultStateMachine {
             all {
                 assert(SameVscPacketsInv),
                 // action does not matter, but needed to have uniform effect
-                step
+                VotingPowerChange("node1", 50)
             }
         )
 
@@ -459,13 +494,13 @@ module CCVDefaultStateMachine {
             // advance time on provider by VscTimeout + 1 Second
             EndAndBeginBlockForProvider(VscTimeout + 5 * Second, Set(), Set())
         )
-        // .then(
-        //     all {
-        //         // the consumer chains should have timed out
-        //         assert(ConsumerChains.forall(
-        //             chain => currentState.providerState.consumerStatus.get(chain) == TIMEDOUT
-        //         )),
-        //         VotingPowerChange("node2", 50)// action needs to be there but does not matter
-        //     }
-        // )
+        .then(
+            all {
+                // the consumer chains should have timed out
+                assert(ConsumerChains.forall(
+                    chain => currentState.providerState.consumerStatus.get(chain) == TIMEDOUT
+                )),
+                VotingPowerChange("node1", 50) // action needs to be there but does not matter what it is
+            }
+        )
 }
\ No newline at end of file
diff --git a/tests/difference/core/quint_model/ccv_test.qnt b/tests/difference/core/quint_model/ccv_test.qnt
index 9493e69d6a..b21653ae6f 100644
--- a/tests/difference/core/quint_model/ccv_test.qnt
+++ b/tests/difference/core/quint_model/ccv_test.qnt
@@ -1,8 +1,8 @@
 // -*- mode: Bluespec; -*-
 
 // contains test logic for the stateless functions in the CCV module
-module CCVTest {
-    import CCVTypes.* from "./ccv"
+module ccv_test {
+    import ccv_types.* from "./ccv"
     import Time.* from "./libraries/Time"
     import extraSpells.* from "./libraries/extraSpells"
 
@@ -11,7 +11,7 @@ module CCVTest {
     pure val unbondingPeriods = chains.mapBy(chain => 2 * Week)
     pure val ccvTimeouts = chains.mapBy(chain => 3 * Week)
 
-    import CCV(VscTimeout = 5 * Week, CcvTimeout = ccvTimeouts, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = consumerChains).* from "./ccv"
+    import ccv(VscTimeout = 5 * Week, CcvTimeout = ccvTimeouts, UnbondingPeriodPerChain = unbondingPeriods, ConsumerChains = consumerChains).* from "./ccv"
 
     // negative voting powers give an error
     run VotingPowerNegativeTest =

From 852dac496aa747800f9af4d3761fd88bdcac4205 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Wed, 11 Oct 2023 11:40:18 +0200
Subject: [PATCH 66/80] Adjust module name in README and invariant script

---
 tests/difference/core/quint_model/README.md         | 10 +++++-----
 tests/difference/core/quint_model/run_invariants.sh |  4 ++--
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 9213b091c3..235372cc1c 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -22,18 +22,18 @@ The parameters of the protocol are defined as consts in [ccv.qnt](ccv.qnt).
 
 To run unit tests, run 
 ```
-quint test ccv_test.qnt --main CCVTest
+quint test ccv_test.
 ```
 and 
 ```
-quint test ccv_statemachine.qnt --main CCVDefaultStateMachine
+quint test ccv_statemachine.qnt
 ```
 
 ### Invariants
 
 The invariants to check are in [ccv_statemachine.qnt](ccv_statemachine.qnt).
 Check a single invariant by running
-`quint run --invariant INVARIANT_NAME ccv_statemachine.qnt --main CCVDefaultStateMachine`,
+`quint run --invariant INVARIANT_NAME ccv_statemachine.qnt`,
 or all invariants one after another with the help of the script `run_invariants.sh`.
 Each invariant takes about a minute to run.
 
@@ -53,7 +53,7 @@ that were running at the time the packet was sent (and are still running).
 Invariants can also be model-checked by Apalache, using this command:
 ```
 quint verify --invariant ValidatorUpdatesArePropagatedInv,ValidatorSetHasExistedInv,SameVscPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv \
---main CCVDefaultStateMachine ccv_statemachine.qnt
+ ccv_statemachine.qnt
 ```
 
 ### Sanity Checks
@@ -63,7 +63,7 @@ In detail, they are invariant checks that we expect to fail.
 They usually negate the appearance of some behaviour, i.e. `not(DesirableBehaviour)`.
 Then, a counterexample for this is an example trace exhibiting the behaviour.
 
-They are run like invariant checks, i.e. `quint run --invariant SANITY_CHECK_NAME ccv_statemachine.qnt --main CCVDefaultStateMachine`.
+They are run like invariant checks, i.e. `quint run --invariant SANITY_CHECK_NAME ccv_statemachine.qnt`.
 The available sanity checks are:
 - CanRunConsumer
 - CanStopConsumer
diff --git a/tests/difference/core/quint_model/run_invariants.sh b/tests/difference/core/quint_model/run_invariants.sh
index 5acd79e49c..ae94dcbd2d 100755
--- a/tests/difference/core/quint_model/run_invariants.sh
+++ b/tests/difference/core/quint_model/run_invariants.sh
@@ -1,4 +1,4 @@
 #! /bin/sh
 
-quint test ccv_statemachine.qnt --main CCVDefaultStateMachine
-quint run --invariant "all{ValidatorUpdatesArePropagatedInv,ValidatorSetHasExistedInv,SameVscPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv}" ccv_statemachine.qnt --main CCVDefaultStateMachine --max-steps 500 --max-samples 200
\ No newline at end of file
+quint test ccv_statemachine.qnt
+quint run --invariant "all{ValidatorUpdatesArePropagatedInv,ValidatorSetHasExistedInv,SameVscPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv}" ccv_statemachine.qnt --max-steps 500 --max-samples 200
\ No newline at end of file

From 8aee401634dfafc918044a8ce459898f02b562a9 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Wed, 11 Oct 2023 11:48:46 +0200
Subject: [PATCH 67/80] Fix voting power change behaviour around 0

---
 tests/difference/core/quint_model/ccv.qnt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 2b975d6c53..606574c42b 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -250,8 +250,8 @@ module ccv {
     // the power of a validator on the provider chain is changed to the given amount. We do not care how this happens,
     // e.g. via undelegations, or delegations, ...
     pure def votingPowerChange(currentState: ProtocolState, validator: Node, amount: int): Result = {
-            if (amount <= 0) {
-                Err("Voting power changes must be positive")
+            if (amount < 0) {
+                Err("Voting power changes must be nonnegative")
             } else {
                 pure val currentValidatorSet = currentState.providerState.chainState.currentValidatorSet
                 pure val newValidatorSet = getUpdatedValidatorSet(currentValidatorSet, validator, amount)

From d75d5c51ad57c62e085d942580996bf78997863a Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Wed, 11 Oct 2023 11:50:34 +0200
Subject: [PATCH 68/80] Adjust error message in test

---
 tests/difference/core/quint_model/ccv_test.qnt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/ccv_test.qnt b/tests/difference/core/quint_model/ccv_test.qnt
index b21653ae6f..4262c4c386 100644
--- a/tests/difference/core/quint_model/ccv_test.qnt
+++ b/tests/difference/core/quint_model/ccv_test.qnt
@@ -218,7 +218,7 @@ module ccv_test {
             Set("chain3"),
             Set()
         )
-        res._2 == "cannot start a consumer that is stopped or running"
+        res._2 == "cannot start a consumer that is stopped or already a consumer"
     }
 
     run ConsumerStatusMapAlreadyStoppedTest =

From f294eecabb5a3aee2b592316d4df353645311a9d Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Wed, 11 Oct 2023 14:45:32 +0200
Subject: [PATCH 69/80] Remove special treatment of 0 voting power

---
 tests/difference/core/quint_model/ccv.qnt      | 10 +---------
 tests/difference/core/quint_model/ccv_test.qnt |  4 ++--
 2 files changed, 3 insertions(+), 11 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 606574c42b..ac1f1f4959 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -254,7 +254,7 @@ module ccv {
                 Err("Voting power changes must be nonnegative")
             } else {
                 pure val currentValidatorSet = currentState.providerState.chainState.currentValidatorSet
-                pure val newValidatorSet = getUpdatedValidatorSet(currentValidatorSet, validator, amount)
+                pure val newValidatorSet = currentValidatorSet.put(validator, amount)
                 // set the validator set changed flag
                 val newProviderState = currentState.providerState.with(
                     "providerValidatorSetChangedInThisBlock", true
@@ -737,14 +737,6 @@ module ccv {
         newState
     }
 
-    // Updates the given oldValidatorSet by setting the validator to newVotingPower.
-    // If newVotingPower is zero, the validator is removed.
-    pure def getUpdatedValidatorSet(oldValidatorSet: ValidatorSet, validator: Node, newVotingPower: int): ValidatorSet =
-        if (newVotingPower > 0) 
-        oldValidatorSet.put(validator, newVotingPower)
-        else
-        oldValidatorSet.mapRemove(validator)
-
     // Returns a ProtocolState where the current validator set on the provider is set to 
     // newValidatorSet.
     pure def setProviderValidatorSet(currentState: ProtocolState, newValidatorSet: ValidatorSet): ProtocolState = {
diff --git a/tests/difference/core/quint_model/ccv_test.qnt b/tests/difference/core/quint_model/ccv_test.qnt
index 4262c4c386..eb832603e6 100644
--- a/tests/difference/core/quint_model/ccv_test.qnt
+++ b/tests/difference/core/quint_model/ccv_test.qnt
@@ -35,7 +35,7 @@ module ccv_test {
         result.newState.providerState.chainState.currentValidatorSet.get("validator") == 5
     }
 
-    // validators that get zero voting power are removed
+    // voting power of 0 is allowed and applied as usual
     run VotingPowerZeroTest =
     {
         val tmpResult = votingPowerChange(
@@ -49,7 +49,7 @@ module ccv_test {
             0
         )
         not(finalResult.hasError) and
-        not(finalResult.newState.providerState.chainState.currentValidatorSet.keys().contains("validator"))
+        finalResult.newState.providerState.chainState.currentValidatorSet.get("validator") == 0
     }
 
     run VotingPowerSetsFlagTest =

From 4d873721481f47eb1873b8e3dd0e2200b19f6162 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Thu, 12 Oct 2023 14:17:05 +0200
Subject: [PATCH 70/80] Rename sentVscPackets to sentVscPacketsToConsumer

---
 tests/difference/core/quint_model/ccv.qnt     | 20 +++++++++----------
 .../core/quint_model/ccv_statemachine.qnt     | 10 +++++-----
 .../difference/core/quint_model/ccv_test.qnt  |  2 +-
 3 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index ac1f1f4959..e23bbb8532 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -69,7 +69,7 @@ module ccv_types {
             receivedMaturations: Set[VscMaturedPacket],
 
             // Stores VscPackets which have been sent but where the provider has *not received a response yet*.
-            sentVscPackets: Chain -> List[VscPacket],
+            sentVscPacketsToConsumer: Chain -> List[VscPacket],
 
             // stores whether, in this block, the validator set has changed.
             // this is needed because the validator set might be considered to have changed, even though
@@ -92,7 +92,7 @@ module ccv_types {
             chainState: GetEmptyChainState,
             outstandingPacketsToConsumer: Map(),
             receivedMaturations: Set(),
-            sentVscPackets: Map(),
+            sentVscPacketsToConsumer: Map(),
             providerValidatorSetChangedInThisBlock: false,
             consumerStatus: Map(),
             runningVscId: 0,
@@ -178,7 +178,7 @@ module ccv_types {
                     },
                     outstandingPacketsToConsumer: Map(),
                     receivedMaturations: Set(),
-                    sentVscPackets: Map(),
+                    sentVscPacketsToConsumer: Map(),
                     providerValidatorSetChangedInThisBlock: false,
                     consumerStatus: Map(),
                     runningVscId: 0,
@@ -634,10 +634,10 @@ module ccv {
             )
             ).with(
                 // update the sent VscPackets
-                "sentVscPackets",
+                "sentVscPacketsToConsumer",
                 ConsumerChains.mapBy(
                     (consumer) => 
-                    providerState.sentVscPackets.get(consumer).concat(
+                    providerState.sentVscPacketsToConsumer.get(consumer).concat(
                         newSentPacketsPerConsumer.get(consumer)
                     )
                 )
@@ -688,7 +688,7 @@ module ccv {
     pure def recvPacketOnProvider(currentState: ProtocolState, sender: Chain, packet: VscMaturedPacket): Result = {
         if (not(isRunningConsumer(sender, currentState.providerState))) {
             Err("Sender is not currently a consumer - must have 'running' status!")
-        } else if (currentState.providerState.sentVscPackets.get(sender).head().id != packet.id) {
+        } else if (currentState.providerState.sentVscPacketsToConsumer.get(sender).head().id != packet.id) {
             // the packet is not the oldest sentVscPacket, something went wrong
             Err("Received maturation is not for the oldest sentVscPacket")
         } else {
@@ -698,7 +698,7 @@ module ccv {
                 "receivedMaturations", newReceivedMaturations
             )
             // prune the sentVscPacket
-            val newSentVscPacket = currentState.providerState.sentVscPackets.get(sender).tail()
+            val newSentVscPacket = currentState.providerState.sentVscPacketsToConsumer.get(sender).tail()
             val newState = currentState.with(
                 "providerState", newProviderState
             )
@@ -784,9 +784,9 @@ module ccv {
             val consumerState = currentState.consumerStates.get(consumer)
 
             // has a packet been sent on the provider more than VscTimeout ago, but we have not received an answer since then?
-            val sentVscPackets = providerState.sentVscPackets.get(consumer)
-            if(sentVscPackets.length() > 0) {
-                val oldestSentVscPacket = sentVscPackets.head() // if length is 0, this is undefined, but we check for this before we use it
+            val sentVscPacketsToConsumer = providerState.sentVscPacketsToConsumer.get(consumer)
+            if(sentVscPacketsToConsumer.length() > 0) {
+                val oldestSentVscPacket = sentVscPacketsToConsumer.head() // if length is 0, this is undefined, but we check for this before we use it
                 if(oldestSentVscPacket.sendingTime + VscTimeout < providerState.chainState.lastTimestamp) {
                     (true, "")
                 } else {
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index 26e365a398..52c4bc83c9 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -121,7 +121,7 @@ module ccv_statemachine {
             "outstandingPacketsToConsumer", 
             ConsumerChains.mapBy(chain => List())
         ).with(
-            "sentVscPackets", 
+            "sentVscPacketsToConsumer", 
             ConsumerChains.mapBy(chain => List())
         ).with(
             // set the validator set to be the initial validator set in the history
@@ -213,7 +213,7 @@ module ccv_statemachine {
             // ... for each consumer that is running then ...
             runningConsumers.forall(
                 // ...the validator set is in a sent packet
-                consumer => currentState.providerState.sentVscPackets.get(consumer).toSet().exists(
+                consumer => currentState.providerState.sentVscPacketsToConsumer.get(consumer).toSet().exists(
                     packet => packet.validatorSet == providerValSetInCurBlock
                 )
             )
@@ -272,14 +272,14 @@ module ccv_statemachine {
 
     // If we send a VscPacket, this is eventually responded to by all consumers
     // that were running at the time the packet was sent (and are still running).
-    // Since we remove sentVscPackets when we receive responses for them,
+    // Since we remove sentVscPacketsToConsumer when we receive responses for them,
     // we just check that if a sentVscPacket has been sent more than
     // VscTimeout ago, the consumer must have been dropped.
     // In practice, when this is true, a pending unbonding can mature.
     val EventuallyMatureOnProviderInv =
         runningConsumers.forall(
             consumer => {
-                val sentPackets = currentState.providerState.sentVscPackets.get(consumer).toSet()
+                val sentPackets = currentState.providerState.sentVscPacketsToConsumer.get(consumer).toSet()
                 sentPackets.forall(
                     packet =>
                         // consumer still has time to respond
@@ -363,7 +363,7 @@ module ccv_statemachine {
                     "consumer2" -> List(),
                     "consumer3" -> List()
                 )),
-                assert(currentState.providerState.sentVscPackets == Map(
+                assert(currentState.providerState.sentVscPacketsToConsumer == Map(
                     "consumer1" -> List(),
                     "consumer2" -> List(),
                     "consumer3" -> List()
diff --git a/tests/difference/core/quint_model/ccv_test.qnt b/tests/difference/core/quint_model/ccv_test.qnt
index eb832603e6..4f49f5ff4d 100644
--- a/tests/difference/core/quint_model/ccv_test.qnt
+++ b/tests/difference/core/quint_model/ccv_test.qnt
@@ -121,7 +121,7 @@ module ccv_test {
     ).with(
         // put an entry into sentVscPacket on the provider that corresponds to the packet we put on the consumer
         "providerState", _DeliverPacketToProvider_TestState.providerState.with(
-            "sentVscPackets", _DeliverPacketToProvider_TestState.providerState.sentVscPackets.put(
+            "sentVscPacketsToConsumer", _DeliverPacketToProvider_TestState.providerState.sentVscPacketsToConsumer.put(
                 "sender", List({
                     id: 0,
                     validatorSet: _DeliverPacketToProvider_TestState.providerState.chainState.currentValidatorSet,

From 53d5bff2b89008e6bb53bd7057809a4c87a7cdd0 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <57488781+p-offtermatt@users.noreply.github.com>
Date: Thu, 12 Oct 2023 17:03:41 +0200
Subject: [PATCH 71/80] Update tests/difference/core/quint_model/README.md

Co-authored-by: insumity <insumity@users.noreply.github.com>
---
 tests/difference/core/quint_model/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 235372cc1c..54251a7544 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -22,7 +22,7 @@ The parameters of the protocol are defined as consts in [ccv.qnt](ccv.qnt).
 
 To run unit tests, run 
 ```
-quint test ccv_test.
+quint test ccv_test.qnt
 ```
 and 
 ```

From 738a3479b9ef088e39e3aed61ec002782b25599b Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Thu, 12 Oct 2023 18:21:38 +0200
Subject: [PATCH 72/80] Resolve comments

---
 tests/difference/core/quint_model/ccv_statemachine.qnt | 10 ----------
 tests/difference/core/quint_model/ccv_test.qnt         |  6 ++----
 2 files changed, 2 insertions(+), 14 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index 52c4bc83c9..93ee8f6fe3 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -18,15 +18,6 @@ module ccv_statemachine {
 
     var currentState: ProtocolState
 
-
-    pure def ACTIONS = Set(
-        "VotingPowerChange",
-        "DeliverVscPacket",
-        "DeliverVscMaturedPacket",
-        "EndAndBeginBlockForProvider",
-        "EndAndBeginBlockForConsumer"
-    )
-
     // a type storing the parameters used in actions.
     // this is used in the trace to store
     // the name of the last action, plus the parameters we passed to it.
@@ -85,7 +76,6 @@ module ccv_statemachine {
         nondet node = oneOf(nodes)
         // very restricted set of voting powers. exact values are not important,
         // and this keeps the state space smaller.
-        // 0 for getting a validator out of the validator set, and two non-zero values
         nondet newVotingPower = oneOf(Set(0, 50, 100))
         VotingPowerChange(node, newVotingPower),
 
diff --git a/tests/difference/core/quint_model/ccv_test.qnt b/tests/difference/core/quint_model/ccv_test.qnt
index 4f49f5ff4d..621df175c2 100644
--- a/tests/difference/core/quint_model/ccv_test.qnt
+++ b/tests/difference/core/quint_model/ccv_test.qnt
@@ -145,7 +145,6 @@ module ccv_test {
     run StateModificationOK_DeliverPacketToProviderHappyPathTest =
     {
         val result = DeliverPacketToProviderHappyPathTest_resultAndTimeout._1
-        val timedOut = DeliverPacketToProviderHappyPathTest_resultAndTimeout._2
         val newProviderState = result.newState.providerState
         val newConsumerState = result.newState.consumerStates.get("sender")
         not(result.hasError) and
@@ -168,17 +167,16 @@ module ccv_test {
     run DidTimeOut_DeliverPacketToProviderTimeoutTest =
     {
         val result = DeliverPacketToProviderTimeoutTest_resultAndTimeout._1
-        val timedOut = DeliverPacketToProviderTimeoutTest_resultAndTimeout._2
+        val timeout = DeliverPacketToProviderTimeoutTest_resultAndTimeout._2
         val newProviderState = result.newState.providerState
         val newConsumerState = result.newState.consumerStates.get("sender")
         not(result.hasError) and
-        timedOut
+        timeout
     }
 
     run StateModificationOK_DeliverPacketToProviderTimeoutTest =
     {
         val result = DeliverPacketToProviderTimeoutTest_resultAndTimeout._1
-        val timedOut = DeliverPacketToProviderTimeoutTest_resultAndTimeout._2
         val newProviderState = result.newState.providerState
         val newConsumerState = result.newState.consumerStates.get("sender")
         not(result.hasError) and

From 3a03fcdccdd5dfc2f7118723a19be4f631d67628 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Thu, 12 Oct 2023 18:34:15 +0200
Subject: [PATCH 73/80] Adjust comment to fit actual time advancement

---
 tests/difference/core/quint_model/ccv_statemachine.qnt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index 93ee8f6fe3..9585073224 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -482,7 +482,7 @@ module ccv_statemachine {
         )
         .then(
             // advance time on provider by VscTimeout + 1 Second
-            EndAndBeginBlockForProvider(VscTimeout + 5 * Second, Set(), Set())
+            EndAndBeginBlockForProvider(VscTimeout + 1 * Second, Set(), Set())
         )
         .then(
             all {

From d71dad347a3a9d39b135e6d2e9479fffb0eba64d Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 13 Oct 2023 10:18:49 +0200
Subject: [PATCH 74/80] Remove hasError field and make it a function

---
 tests/difference/core/quint_model/ccv.qnt      | 13 ++++++-------
 .../core/quint_model/ccv_statemachine.qnt      | 10 +++++-----
 tests/difference/core/quint_model/ccv_test.qnt | 18 +++++++++---------
 3 files changed, 20 insertions(+), 21 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index e23bbb8532..e1d78c273b 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -148,17 +148,15 @@ module ccv_types {
     }
 
     // we return either a result or an error.
-    // if hasError is true, newState may be arbitrary, but the error will be meaningful.
-    // if hasError is false, error may be arbitrary, but newState will be meaningful.
+    // if hasError() is true, newState may be arbitrary, but the error will be meaningful.
+    // if hasError() is false, error may be arbitrary, but newState will be meaningful.
     type Result = {
-        hasError: bool,
         newState: ProtocolState,
         error: Error
     }
 
     pure def Ok(newState: ProtocolState): Result = {
         {
-            hasError: false,
             newState: newState,
             error: {
                 message: ""
@@ -168,7 +166,6 @@ module ccv_types {
 
     pure def Err(msg: str): Result = {
         {
-            hasError: true,
             newState: {
                 providerState: {
                     chainState: {
@@ -191,6 +188,8 @@ module ccv_types {
         }
     }
 
+    pure def hasError(result: Result): bool = result.error.message != ""
+
     // possible consumer statuses
     pure val STOPPED = "stopped" // the chain was once a consumer chain, but has been voluntarily dropped by the provider.
     pure val TIMEDOUT = "timedout" // the chain has timed out and was dropped by the provider. This is only used for involuntary drops.
@@ -308,7 +307,7 @@ module ccv {
                 // the packet has not timed out, so receive it on the provider
                 val result = recvPacketOnProvider(currentState, sender, packet)
                 val tmpState = result.newState
-                if (result.hasError) {
+                if (result.hasError()) {
                     (Err(result.error.message), false)
                 } else {
                     (Ok(removeOutstandingPacketFromConsumer(tmpState, sender)), false) // false because the packet did not time out
@@ -357,7 +356,7 @@ module ccv {
                 // the packet has not timed out, so receive it on the consumer
                 val result = recvPacketOnConsumer(currentState, receiver, packet)
                 val tmpState = result.newState
-                if (result.hasError) {
+                if (result.hasError()) {
                     (Err(result.error.message), false)
                 } else {
                     (Ok(removeOutstandingPacketFromProvider(tmpState, receiver)), false) // false because the packet did not time out
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_statemachine.qnt
index 9585073224..cb62f560ee 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_statemachine.qnt
@@ -131,7 +131,7 @@ module ccv_statemachine {
     action VotingPowerChange(validator: Node, newVotingPower: int): bool = 
         val result = votingPowerChange(currentState, validator, newVotingPower)
         all {
-            result.hasError == false,
+            result.hasError() == false,
             currentState' = result.newState,
             trace' = trace.append(emptyAction.with("kind", "VotingPowerChange").with("validator", validator).with("newVotingPower", newVotingPower))
         }
@@ -142,7 +142,7 @@ module ccv_statemachine {
         val resultAndTimeout = deliverPacketToConsumer(currentState, receiver)
         val result = resultAndTimeout._1
         all {
-            result.hasError == false,
+            result.hasError() == false,
             currentState' = result.newState,
             trace' = trace.append(emptyAction.with("kind", "DeliverVscPacket").with("consumerChain", receiver))
         }
@@ -153,7 +153,7 @@ module ccv_statemachine {
         val resultAndTimeout = deliverPacketToProvider(currentState, sender)
         val result = resultAndTimeout._1
         all {
-            result.hasError == false,
+            result.hasError() == false,
             currentState' = result.newState,
             trace' = trace.append(emptyAction.with("kind", "DeliverVscMaturedPacket").with("consumerChain", sender))
         }
@@ -164,7 +164,7 @@ module ccv_statemachine {
         consumersToStop: Set[Chain]): bool = 
         val result = endAndBeginBlockForProvider(currentState, timeAdvancement, consumersToStart, consumersToStop)
         all {
-            result.hasError == false,
+            result.hasError() == false,
             currentState' = result.newState,
             trace' = trace.append(emptyAction.with("kind", "EndAndBeginBlockForProvider").with("timeAdvancement", timeAdvancement).with("consumersToStart", consumersToStart).with("consumersToStop", consumersToStop))
         }
@@ -174,7 +174,7 @@ module ccv_statemachine {
         timeAdvancement: Time): bool = 
         val result = endAndBeginBlockForConsumer(currentState, chain, timeAdvancement)
         all {
-            result.hasError == false,
+            result.hasError() == false,
             currentState' = result.newState,
             trace' = trace.append(emptyAction.with("kind", "EndAndBeginBlockForConsumer").with("consumerChain", chain).with("timeAdvancement", timeAdvancement))
         }
diff --git a/tests/difference/core/quint_model/ccv_test.qnt b/tests/difference/core/quint_model/ccv_test.qnt
index 621df175c2..6bbe884d52 100644
--- a/tests/difference/core/quint_model/ccv_test.qnt
+++ b/tests/difference/core/quint_model/ccv_test.qnt
@@ -20,7 +20,7 @@ module ccv_test {
             GetEmptyProtocolState,
             "validator",
             -1
-        ).hasError
+        ).hasError()
     }
 
     run VotingPowerOkTest =
@@ -30,7 +30,7 @@ module ccv_test {
             "validator",
             5
         )
-        not(result.hasError) and
+        not(result.hasError()) and
         result.newState.providerState.chainState.currentValidatorSet.keys().contains("validator") and
         result.newState.providerState.chainState.currentValidatorSet.get("validator") == 5
     }
@@ -48,7 +48,7 @@ module ccv_test {
             "validator",
             0
         )
-        not(finalResult.hasError) and
+        not(finalResult.hasError()) and
         finalResult.newState.providerState.chainState.currentValidatorSet.get("validator") == 0
     }
 
@@ -67,7 +67,7 @@ module ccv_test {
             0
         )
         // still should set the flag
-        not(finalResult.hasError) and
+        not(finalResult.hasError()) and
         finalResult.newState.providerState.providerValidatorSetChangedInThisBlock
     }
 
@@ -80,7 +80,7 @@ module ccv_test {
             "validator",
             0
         )
-        not(result.hasError) and
+        not(result.hasError()) and
         result.newState.providerState.chainState.votingPowerHistory == List()
     }
 
@@ -138,7 +138,7 @@ module ccv_test {
     {
         val result = DeliverPacketToProviderHappyPathTest_resultAndTimeout._1
         val timeout = DeliverPacketToProviderHappyPathTest_resultAndTimeout._2
-        not(result.hasError) and
+        not(result.hasError()) and
         not(timeout)
     }
 
@@ -147,7 +147,7 @@ module ccv_test {
         val result = DeliverPacketToProviderHappyPathTest_resultAndTimeout._1
         val newProviderState = result.newState.providerState
         val newConsumerState = result.newState.consumerStates.get("sender")
-        not(result.hasError) and
+        not(result.hasError()) and
         newProviderState.receivedMaturations.size() == 1 and
         newConsumerState.outstandingPacketsToProvider.length() == 0
     }
@@ -170,7 +170,7 @@ module ccv_test {
         val timeout = DeliverPacketToProviderTimeoutTest_resultAndTimeout._2
         val newProviderState = result.newState.providerState
         val newConsumerState = result.newState.consumerStates.get("sender")
-        not(result.hasError) and
+        not(result.hasError()) and
         timeout
     }
 
@@ -179,7 +179,7 @@ module ccv_test {
         val result = DeliverPacketToProviderTimeoutTest_resultAndTimeout._1
         val newProviderState = result.newState.providerState
         val newConsumerState = result.newState.consumerStates.get("sender")
-        not(result.hasError) and
+        not(result.hasError()) and
         newProviderState.receivedMaturations.size() == 0 and
         newProviderState.consumerStatus.get("sender") == TIMEDOUT
     }

From 455696a14fb6d1e1301112c540f44de421ecd480 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 13 Oct 2023 15:32:30 +0200
Subject: [PATCH 75/80] Adjust docstring

---
 tests/difference/core/quint_model/ccv.qnt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index e1d78c273b..a11852294c 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -267,7 +267,7 @@ module ccv {
     }
 
     // Delivers the next queued VscMaturedPacket from a consumer chain to the provider chain.
-    // Only argument is the consumer chain, from which the packet will be delivered.
+    // Arguments are the currentState and the the consumer chain, from which the packet will be delivered.
     // If this packet will time out on the provider on delivery,
     // the consumer will be dropped.
     // The first return is the result of the operation, the second result is a boolean

From d422cb49b90a50ee6502c5e9daa31ce5e12790af Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 13 Oct 2023 15:36:04 +0200
Subject: [PATCH 76/80] Remove unused timedout val

---
 tests/difference/core/quint_model/ccv.qnt | 2 --
 1 file changed, 2 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index a11852294c..9a17510bfe 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -280,8 +280,6 @@ module ccv {
             (Err("No outstanding packets to deliver"), false)
         } else {
             val packet = currentState.consumerStates.get(sender).outstandingPacketsToProvider.head()
-            // if the packet has timed out, drop the consumer. its state doesn't matter anymore
-            val timeout = CcvTimeout.get(sender)
             if(packet.sendingTime + CcvTimeout.get(sender) < currentState.providerState.chainState.lastTimestamp) {
                 // drop consumer
                 val result = stopConsumers(

From 6ed82c847d92bec121dfdd7c2cd54854bd77d76d Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Fri, 13 Oct 2023 15:37:11 +0200
Subject: [PATCH 77/80] Update doc

---
 tests/difference/core/quint_model/ccv.qnt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 9a17510bfe..5ea3d8f4a7 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -315,7 +315,7 @@ module ccv {
     }   
 
     // Delivers the next queued VscPacket from the provider chain to a consumer chain.
-    // Only argument is the consumer chain, to which the packet will be delivered.
+    // Arguments are the current state and the consumer chain, to which the packet will be delivered.
     // If this packet will time out on the consumer on delivery,
     // the consumer will be dropped.
     // The first return is the result of the operation, the second result is a boolean

From b817f431e2b981850771a60afcd3cd16d2cac952 Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Mon, 16 Oct 2023 10:36:32 +0200
Subject: [PATCH 78/80] Rename statemachine to model

---
 tests/difference/core/quint_model/README.md          | 12 ++++++------
 .../{ccv_statemachine.qnt => ccv_model.qnt}          |  4 ++--
 tests/difference/core/quint_model/run_invariants.sh  |  4 ++--
 3 files changed, 10 insertions(+), 10 deletions(-)
 rename tests/difference/core/quint_model/{ccv_statemachine.qnt => ccv_model.qnt} (99%)

diff --git a/tests/difference/core/quint_model/README.md b/tests/difference/core/quint_model/README.md
index 54251a7544..0cef3bc632 100644
--- a/tests/difference/core/quint_model/README.md
+++ b/tests/difference/core/quint_model/README.md
@@ -4,7 +4,7 @@ This folder contains a Quint model for the core logic of Cross-Chain Validation
 The files are as follows:
 - ccv.qnt: Contains the type definitions, data structures, functional logic for CCV.
 The core of the protocol.
-- ccv_statemachine.qnt: Contains the state machine layer for CCV. Very roughly speaking, this could be seen as "e2e tests".
+- ccv_model.qnt: Contains the stateful part of the model for CCV. Very roughly speaking, this could be seen as "e2e tests".
 Also contains invariants.
 - ccv_test.qnt: Contains unit tests for the functional layer of CCV.
 - libraries/*: Libraries that don't belong to CCV, but are used by it.
@@ -26,14 +26,14 @@ quint test ccv_test.qnt
 ```
 and 
 ```
-quint test ccv_statemachine.qnt
+quint test ccv_model.qnt
 ```
 
 ### Invariants
 
-The invariants to check are in [ccv_statemachine.qnt](ccv_statemachine.qnt).
+The invariants to check are in [ccv_model.qnt](ccv_model.qnt).
 Check a single invariant by running
-`quint run --invariant INVARIANT_NAME ccv_statemachine.qnt`,
+`quint run --invariant INVARIANT_NAME ccv_model.qnt`,
 or all invariants one after another with the help of the script `run_invariants.sh`.
 Each invariant takes about a minute to run.
 
@@ -53,7 +53,7 @@ that were running at the time the packet was sent (and are still running).
 Invariants can also be model-checked by Apalache, using this command:
 ```
 quint verify --invariant ValidatorUpdatesArePropagatedInv,ValidatorSetHasExistedInv,SameVscPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv \
- ccv_statemachine.qnt
+ ccv_model.qnt
 ```
 
 ### Sanity Checks
@@ -63,7 +63,7 @@ In detail, they are invariant checks that we expect to fail.
 They usually negate the appearance of some behaviour, i.e. `not(DesirableBehaviour)`.
 Then, a counterexample for this is an example trace exhibiting the behaviour.
 
-They are run like invariant checks, i.e. `quint run --invariant SANITY_CHECK_NAME ccv_statemachine.qnt`.
+They are run like invariant checks, i.e. `quint run --invariant SANITY_CHECK_NAME ccv_model.qnt`.
 The available sanity checks are:
 - CanRunConsumer
 - CanStopConsumer
diff --git a/tests/difference/core/quint_model/ccv_statemachine.qnt b/tests/difference/core/quint_model/ccv_model.qnt
similarity index 99%
rename from tests/difference/core/quint_model/ccv_statemachine.qnt
rename to tests/difference/core/quint_model/ccv_model.qnt
index cb62f560ee..300c543d40 100644
--- a/tests/difference/core/quint_model/ccv_statemachine.qnt
+++ b/tests/difference/core/quint_model/ccv_model.qnt
@@ -1,6 +1,6 @@
 // -*- mode: Bluespec; -*-
-module ccv_statemachine {
-    // A basic state machine that utilizes the CCV protocol.
+module ccv_model {
+    // A basic stateful model that utilizes the CCV protocol.
     import ccv_types.* from "./ccv"
     import Time.* from "./libraries/Time"
     import extraSpells.* from "./libraries/extraSpells"
diff --git a/tests/difference/core/quint_model/run_invariants.sh b/tests/difference/core/quint_model/run_invariants.sh
index ae94dcbd2d..4c65693cc0 100755
--- a/tests/difference/core/quint_model/run_invariants.sh
+++ b/tests/difference/core/quint_model/run_invariants.sh
@@ -1,4 +1,4 @@
 #! /bin/sh
 
-quint test ccv_statemachine.qnt
-quint run --invariant "all{ValidatorUpdatesArePropagatedInv,ValidatorSetHasExistedInv,SameVscPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv}" ccv_statemachine.qnt --max-steps 500 --max-samples 200
\ No newline at end of file
+quint test ccv_model.qnt
+quint run --invariant "all{ValidatorUpdatesArePropagatedInv,ValidatorSetHasExistedInv,SameVscPacketsInv,MatureOnTimeInv,EventuallyMatureOnProviderInv}" ccv_model.qnt --max-steps 500 --max-samples 200
\ No newline at end of file

From 70cd7742ee74295ea07124fdd169d194038f1ded Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Mon, 16 Oct 2023 10:40:47 +0200
Subject: [PATCH 79/80] Use ... syntax

---
 tests/difference/core/quint_model/ccv.qnt | 23 +++++++++--------------
 1 file changed, 9 insertions(+), 14 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 5ea3d8f4a7..8cab951c99 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -620,30 +620,25 @@ module ccv {
                 List()
             }
         )
-        providerState.with(
-            // send VscPackets to consumers
-            "outstandingPacketsToConsumer",
-            ConsumerChains.mapBy(
+        val newOutstandingPacketsToConsumer = ConsumerChains.mapBy(
                 (consumer) => 
                 providerState.outstandingPacketsToConsumer.get(consumer).concat(
                     newSentPacketsPerConsumer.get(consumer)
                 )
             )
-            ).with(
-                // update the sent VscPackets
-                "sentVscPacketsToConsumer",
-                ConsumerChains.mapBy(
+        val newSentVscPackets = ConsumerChains.mapBy(
                     (consumer) => 
                     providerState.sentVscPacketsToConsumer.get(consumer).concat(
                         newSentPacketsPerConsumer.get(consumer)
                     )
                 )
-            ).with(
-                // the validator set has not changed yet in the new block
-                "providerValidatorSetChangedInThisBlock", false
-            ).with(
-                "runningVscId", providerState.runningVscId + 1
-            )
+        {
+            ...providerState,
+            outstandingPacketsToConsumer: newOutstandingPacketsToConsumer,
+            sentVscPacketsToConsumer: newSentVscPackets,
+            providerValidatorSetChangedInThisBlock: false,
+            runningVscId: providerState.runningVscId + 1,
+        }
     }
 
     // receives a given packet (sent by the provider) on the consumer. The arguments are the consumer chain that is receiving the packet, and the packet itself.

From 86324b71a9449d24e48601d47db34b3501e13a3c Mon Sep 17 00:00:00 2001
From: Philip Offtermatt <p.offtermatt@gmail.com>
Date: Mon, 16 Oct 2023 11:17:47 +0200
Subject: [PATCH 80/80] Change Error type to string

---
 tests/difference/core/quint_model/ccv.qnt     | 45 ++++++++-----------
 .../difference/core/quint_model/ccv_model.qnt | 20 ++++-----
 2 files changed, 27 insertions(+), 38 deletions(-)

diff --git a/tests/difference/core/quint_model/ccv.qnt b/tests/difference/core/quint_model/ccv.qnt
index 8cab951c99..0e07b4476c 100644
--- a/tests/difference/core/quint_model/ccv.qnt
+++ b/tests/difference/core/quint_model/ccv.qnt
@@ -143,9 +143,7 @@ module ccv_types {
             consumerStates: Map(),
         }
 
-    type Error = {
-        message: str
-    }
+    type Error = str
 
     // we return either a result or an error.
     // if hasError() is true, newState may be arbitrary, but the error will be meaningful.
@@ -158,9 +156,7 @@ module ccv_types {
     pure def Ok(newState: ProtocolState): Result = {
         {
             newState: newState,
-            error: {
-                message: ""
-            }
+            error: ""
         }
     }
 
@@ -182,13 +178,11 @@ module ccv_types {
                 },
                 consumerStates: Map(),
             },
-            error: {
-                message: msg
-            }
+            error: msg
         }
     }
 
-    pure def hasError(result: Result): bool = result.error.message != ""
+    pure def hasError(result: Result): bool = result.error != ""
 
     // possible consumer statuses
     pure val STOPPED = "stopped" // the chain was once a consumer chain, but has been voluntarily dropped by the provider.
@@ -306,7 +300,7 @@ module ccv {
                 val result = recvPacketOnProvider(currentState, sender, packet)
                 val tmpState = result.newState
                 if (result.hasError()) {
-                    (Err(result.error.message), false)
+                    (result, false)
                 } else {
                     (Ok(removeOutstandingPacketFromConsumer(tmpState, sender)), false) // false because the packet did not time out
                 }
@@ -355,7 +349,7 @@ module ccv {
                 val result = recvPacketOnConsumer(currentState, receiver, packet)
                 val tmpState = result.newState
                 if (result.hasError()) {
-                    (Err(result.error.message), false)
+                    (result, false)
                 } else {
                     (Ok(removeOutstandingPacketFromProvider(tmpState, receiver)), false) // false because the packet did not time out
                 }
@@ -652,21 +646,18 @@ module ccv {
             // update the running validator set, but not the history yet,
             // as that only happens when the next block is started
             val currentConsumerState = currentState.consumerStates.get(receiver)
-            val newConsumerState = currentConsumerState.with(
-                "chainState",
-                currentConsumerState.chainState.with(
-                    "currentValidatorSet", packet.validatorSet
-                )
-            ).with(
-                "maturationTimes",
-                currentConsumerState.maturationTimes.put(
-                    packet, 
-                    currentConsumerState.chainState.lastTimestamp + UnbondingPeriodPerChain.get(receiver)
-                )
-            ).with(
-                "receivedVscPackets",
-                currentConsumerState.receivedVscPackets.prepend(packet)
-            )
+            val newConsumerState = 
+                {
+                    ...currentConsumerState,
+                    chainState: currentConsumerState.chainState.with(
+                        "currentValidatorSet", packet.validatorSet
+                    ),
+                    maturationTimes: currentConsumerState.maturationTimes.put(
+                        packet, 
+                        currentConsumerState.chainState.lastTimestamp + UnbondingPeriodPerChain.get(receiver)
+                    ),
+                    receivedVscPackets: currentConsumerState.receivedVscPackets.prepend(packet)
+                }
             val newConsumerStates = currentState.consumerStates.set(receiver, newConsumerState)
             val newState = currentState.with(
                 "consumerStates", newConsumerStates
diff --git a/tests/difference/core/quint_model/ccv_model.qnt b/tests/difference/core/quint_model/ccv_model.qnt
index 300c543d40..f886fe9e85 100644
--- a/tests/difference/core/quint_model/ccv_model.qnt
+++ b/tests/difference/core/quint_model/ccv_model.qnt
@@ -198,18 +198,16 @@ module ccv_model {
     val ValUpdatePrecondition = trace[trace.length()-1].kind == "EndAndBeginBlockForProvider"
     val ValidatorUpdatesArePropagatedInv = 
         // when the provider has just entered a validator set into a block...
-        if (ValUpdatePrecondition and currentState.providerState.providerValidatorSetChangedInThisBlock) {
-            val providerValSetInCurBlock = providerValidatorHistory.head()
-            // ... for each consumer that is running then ...
-            runningConsumers.forall(
-                // ...the validator set is in a sent packet
-                consumer => currentState.providerState.sentVscPacketsToConsumer.get(consumer).toSet().exists(
-                    packet => packet.validatorSet == providerValSetInCurBlock
-                )
+        ValUpdatePrecondition and currentState.providerState.providerValidatorSetChangedInThisBlock
+            implies
+        val providerValSetInCurBlock = providerValidatorHistory.head()
+        // ... for each consumer that is running then ...
+        runningConsumers.forall(
+            // ...the validator set is in a sent packet
+            consumer => currentState.providerState.sentVscPacketsToConsumer.get(consumer).toSet().exists(
+                packet => packet.validatorSet == providerValSetInCurBlock
             )
-        } else {
-            true
-        }
+        )
 
     // Every consumer chain receives the same sequence of 
     // ValidatorSetChangePackets in the same order.