Listing 2. Source code for creating blueprints.

1 function createBlueprint( 2  BlueprintItSet storage self, 3  address key, 4  string memory token, 5  string memory description, 6  string memory partyName 7 ) public returns (bytes32, Blueprint memory) { 8  uint256 creationTimestamp = block.timestamp; 9  bytes32 blueprintId = keccak256( 10   abi.encode(token, description, creationTimestamp) 11  ); 12  Blueprint memory createdBlueprint = Blueprint( 13   blueprintId, 14   token, 15   description, 16   supplierName, 17   creationTimestamp 18  ); 19  self.supplierBlueprints[key].push(createdBlueprint); 20  self.allBlueprints.push(createdBlueprint); 21  return (blueprintId, createdBlueprint); 22 }