pragma solidity ^0.8.0;

// SPDX-License-Identifier: MIT

contract DefusionSignIn {
    mapping(address => mapping(uint256 => bool)) public _signIn;

    event eveSignIn(address indexed operator, uint256 indexed date);

    function signIn(uint256 date) external {
        require(
            _signIn[msg.sender][date] == false,
            "Defusion: You have signed in!"
        );
        _signIn[msg.sender][date] = true;
        emit eveSignIn(msg.sender, date);
    }
}

{
  "compilationTarget": {
    "contracts/signIn/DefusionSignIn.sol": "DefusionSignIn"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}