Solidity Contrat ================ Here is the Solidity contract definition built by the Python ``hashchain`` module. This contract has been designed to store data privately using as little gas as possible. This contract has been tested against `MythX `_ security standards. .. code-block:: javascript pragma solidity 0.5.7; contract Hashchain { // variables address public owner; mapping(bytes32 => bytes32) public hashChain; // events event newHashRecorded(bytes32 indexed key, bytes32 indexed value); // constructor constructor() public { owner = msg.sender; } // functions function() external {} function record(bytes32 key, bytes32 value) external { require(msg.sender == owner); hashChain[key] = value; emit newHashRecorded(key, value); } function getHash(bytes32 key) external view returns (bytes32){ return hashChain[key]; } }