diff --git a/packages/builders/scripts/testing/append-chain-info.js b/packages/builders/scripts/testing/append-chain-info.js
index f141fe49074..4c4b7f6692c 100644
--- a/packages/builders/scripts/testing/append-chain-info.js
+++ b/packages/builders/scripts/testing/append-chain-info.js
@@ -13,9 +13,6 @@ const chainInfo = {
         counterparty: {
           client_id: '07-tendermint-2',
           connection_id: 'connection-1',
-          prefix: {
-            key_prefix: '',
-          },
         },
         state: 3 /* IBCConnectionState.STATE_OPEN */,
         transferChannel: {
diff --git a/packages/builders/scripts/testing/tweak-chain-info.js b/packages/builders/scripts/testing/tweak-chain-info.js
index 922300ea7c0..ee5ce2da41a 100644
--- a/packages/builders/scripts/testing/tweak-chain-info.js
+++ b/packages/builders/scripts/testing/tweak-chain-info.js
@@ -16,9 +16,6 @@ const chainInfo = {
         counterparty: {
           client_id: '07-tendermint-2',
           connection_id: 'connection-1',
-          prefix: {
-            key_prefix: '',
-          },
         },
         state: 3 /* IBCConnectionState.STATE_OPEN */,
         transferChannel: {
diff --git a/packages/orchestration/src/chain-info.js b/packages/orchestration/src/chain-info.js
index 34c63a62409..087d2f3edba 100644
--- a/packages/orchestration/src/chain-info.js
+++ b/packages/orchestration/src/chain-info.js
@@ -33,9 +33,6 @@ const knownChains = /** @satisfies {Record<string, ChainInfo>} */ (
           counterparty: {
             client_id: '07-tendermint-2',
             connection_id: 'connection-1',
-            prefix: {
-              key_prefix: '',
-            },
           },
           state: 3 /* IBCConnectionState.STATE_OPEN */,
           transferChannel: {
@@ -54,9 +51,6 @@ const knownChains = /** @satisfies {Record<string, ChainInfo>} */ (
           counterparty: {
             client_id: '07-tendermint-2',
             connection_id: 'connection-1',
-            prefix: {
-              key_prefix: '',
-            },
           },
           state: 3 /* IBCConnectionState.STATE_OPEN */,
           transferChannel: {
diff --git a/packages/orchestration/src/cosmos-api.ts b/packages/orchestration/src/cosmos-api.ts
index 86b2f61d3b3..40f3e255281 100644
--- a/packages/orchestration/src/cosmos-api.ts
+++ b/packages/orchestration/src/cosmos-api.ts
@@ -46,9 +46,6 @@ export interface IBCConnectionInfo {
   counterparty: {
     client_id: string;
     connection_id: IBCConnectionID;
-    prefix: {
-      key_prefix: string;
-    };
   };
   transferChannel: {
     portId: string;
diff --git a/packages/orchestration/src/exos/chain-hub.js b/packages/orchestration/src/exos/chain-hub.js
index f938771a480..903fb370c48 100644
--- a/packages/orchestration/src/exos/chain-hub.js
+++ b/packages/orchestration/src/exos/chain-hub.js
@@ -92,9 +92,6 @@ const reverseConnInfo = connInfo => {
     counterparty: {
       client_id: connInfo.client_id,
       connection_id: connInfo.id,
-      prefix: {
-        key_prefix: 'FIXME',
-      },
     },
     state: connInfo.state,
     transferChannel: {
diff --git a/packages/orchestration/src/typeGuards.js b/packages/orchestration/src/typeGuards.js
index e24326e6cd3..a115b841e82 100644
--- a/packages/orchestration/src/typeGuards.js
+++ b/packages/orchestration/src/typeGuards.js
@@ -73,9 +73,6 @@ export const IBCConnectionInfoShape = M.splitRecord({
   counterparty: {
     client_id: M.string(),
     connection_id: IBCConnectionIDShape,
-    prefix: {
-      key_prefix: M.string(),
-    },
   },
   transferChannel: IBCChannelInfoShape,
 });
diff --git a/packages/orchestration/src/utils/registry.js b/packages/orchestration/src/utils/registry.js
index d7c9555e8ce..9156937910c 100644
--- a/packages/orchestration/src/utils/registry.js
+++ b/packages/orchestration/src/utils/registry.js
@@ -61,9 +61,6 @@ function toConnectionEntry(ibcInfo, name, chainInfo) {
     counterparty: {
       client_id: to.client_id,
       connection_id: /** @type {IBCConnectionID} */ (to.connection_id),
-      prefix: {
-        key_prefix: 'FIXME',
-      },
     },
     state: IBCConnectionState.STATE_OPEN, // XXX presumably
     transferChannel: {
diff --git a/packages/orchestration/test/examples/send-anywhere.test.ts b/packages/orchestration/test/examples/send-anywhere.test.ts
index 7a05060f767..b350c53678e 100644
--- a/packages/orchestration/test/examples/send-anywhere.test.ts
+++ b/packages/orchestration/test/examples/send-anywhere.test.ts
@@ -97,9 +97,6 @@ test('send using arbitrary chain info', async t => {
     counterparty: {
       client_id: '07-tendermint-2109',
       connection_id: 'connection-1649',
-      prefix: {
-        key_prefix: 'aWJj',
-      },
     },
     transferChannel: {
       counterPartyChannelId: 'channel-1',
diff --git a/packages/orchestration/test/exos/chain-hub.test.ts b/packages/orchestration/test/exos/chain-hub.test.ts
index bfd7fcb1dd7..98e865c3527 100644
--- a/packages/orchestration/test/exos/chain-hub.test.ts
+++ b/packages/orchestration/test/exos/chain-hub.test.ts
@@ -26,9 +26,6 @@ const connection = {
   counterparty: {
     client_id: '07-tendermint-2',
     connection_id: 'connection-1',
-    prefix: {
-      key_prefix: '',
-    },
   },
   state: 3 /* IBCConnectionState.STATE_OPEN */,
   transferChannel: {
diff --git a/packages/orchestration/test/facade-durability.test.ts b/packages/orchestration/test/facade-durability.test.ts
index ffc4d06f20d..3952ec59c7e 100644
--- a/packages/orchestration/test/facade-durability.test.ts
+++ b/packages/orchestration/test/facade-durability.test.ts
@@ -27,9 +27,6 @@ const mockChainConnection: IBCConnectionInfo = {
   counterparty: {
     client_id: '07-tendermint-2',
     connection_id: 'connection-1',
-    prefix: {
-      key_prefix: '',
-    },
   },
   state: 3 /* IBCConnectionState.STATE_OPEN */,
   transferChannel: {