Installation

Prerequesites

• GHC 8.10.x
• Cabal
• Go Ethereum 1.11.x

Quick Instructions for Running a Single Node Ethereum Private Network

1. Install Go Ethereum (https://geth.ethereum.org/downloads/)

2. create an account

   geth account new
   

3. create a genesis block (https://geth.ethereum.org/docs/fundamentals/private-network#clique-example) with the configuration:

   • clique (Proof-of-Authority)
   • prefunding the account created in the previous step with 1000000000000000000000 Wei (= 1000 Ether) and setting it as sealer

4. initialise chain with genesis block

   geth init genesis.json
   

5. create password file for the account

6. start node

   geth --allow-insecure-unlock --http --nodiscover --unlock $address --password $password_file --mine --miner.etherbase 0x$address
   

Installation

1. install GHC 8.10.x and Cabal (https://www.haskell.org/downloads/)

2. deploy the smart contract

   geth --unlock $address --password $password_file --miner.etherbase 0x$address --exec "loadScript('timestamp/deploy_web3_0.20.js');" console
   

3. add the address of the smart contract in config.ini

4. install dependencies and run web server

   cabal run
   

Run Queries

write data

$ object_id=62962ee9-4331-4eb0-b6ea-0ac1236d4219
$ license_hash=e0fa51e632e434279359d288b851fb7b6a7de56d3106d5ece6d52de4d73f4018
$ requester=a8c898c0e5f2f7f4817ca39b0aa37bc5e6194442

$ curl -X POST http://localhost:8081/registerObject?objectId=$object_id
{
  "message":"The information has been registered successfully under the hash 62962ee943314eb0b6ea0ac1236d421900000000000000000000000000000000."
}

$ curl -X POST http://localhost:8081/createLicense?licenseHash=$license_hash
{
  "message":"The information has been registered successfully under the hash e0fa51e632e434279359d288b851fb7b6a7de56d3106d5ece6d52de4d73f4018."
}

$ curl -X POST "http://localhost:8081/assignLicense?objectId=$object_id&licenseHash=$license_hash"
{
  "message":"The information has been registered successfully under the hash bca16b2ea551dacf5c0eb94416379b7344883ad78a408d6a173c24f526977cc3."
}

$ curl -X POST "http://localhost:8081/acceptLicense?requester=$requester&objectId=$object_id&licenseHash=$license_hash"
{
  "message":"The information has been registered successfully under the hash 95a51b0e554cfbfa8457429b3310c5c6270c2cad58359a667758c09e798768cb."
}

$ curl -X POST "http://localhost:8081/approveRequest?requester=$requester&objectId=$object_id"
{
  "message":"The information has been registered successfully under the hash d131caea0553bf55dd2af1481d9f66d3522fed2f12cc835fd5e50b9805051f2e."
}

query timestamps

$ curl http://localhost:8081/timestamp?hash=d131caea0553bf55dd2af1481d9f66d3522fed2f12cc835fd5e50b9805051f2e
{
  "hash":"d131caea0553bf55dd2af1481d9f66d3522fed2f12cc835fd5e50b9805051f2e",
  "timestamp":"1669377213",
  "creator":"0x0f67f65c5b48786921af60639b370e906e829672"
}