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Examples of scripts using haschchain

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Solidity ContratΒΆ

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.

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];