コントラクトの Event を監視してみる ref: https://qiita.com/blueplanet/items/460f562235019a1bb07d

file0.txt

pragma solidity ^0.4.17;

contract MyToken {
    event Deposit(
        address indexed _from,
        bytes32 indexed _id
    );

    function deposit(bytes32 _id) public {
        // deposit pproc
        // log
        Deposit(msg.sender, _id);
    }
}