Contract 0x4200000000000000000000000000000000000000 4

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

/* Interface Imports */
import { iOVM_L2ToL1MessagePasser } from "./iOVM_L2ToL1MessagePasser.sol";

/**
 * @title OVM_L2ToL1MessagePasser
 * @dev The L2 to L1 Message Passer is a utility contract which facilitate an L1 proof of the
 * of a message on L2. The L1 Cross Domain Messenger performs this proof in its
 * _verifyStorageProof function, which verifies the existence of the transaction hash in this
 * contract's `sentMessages` mapping.
 */
contract OVM_L2ToL1MessagePasser is iOVM_L2ToL1MessagePasser {
    /**********************
     * Contract Variables *
     **********************/

    mapping(bytes32 => bool) public sentMessages;

    /********************
     * Public Functions *
     ********************/

    /**
     * Passes a message to L1.
     * @param _message Message to pass to L1.
     */
    function passMessageToL1(bytes memory _message) public {
        // Note: although this function is public, only messages sent from the
        // L2CrossDomainMessenger will be relayed by the L1CrossDomainMessenger.
        // This is enforced by a check in L1CrossDomainMessenger._verifyStorageProof().
        sentMessages[keccak256(abi.encodePacked(_message, msg.sender))] = true;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

/**
 * @title iOVM_L2ToL1MessagePasser
 */
interface iOVM_L2ToL1MessagePasser {
    /**********
     * Events *
     **********/

    event L2ToL1Message(uint256 _nonce, address _sender, bytes _data);

    /********************
     * Public Functions *
     ********************/

    function passMessageToL1(bytes calldata _message) external;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

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[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"_nonce","type":"uint256"},{"indexed":false,"internalType":"address","name":"_sender","type":"address"},{"indexed":false,"internalType":"bytes","name":"_data","type":"bytes"}],"name":"L2ToL1Message","type":"event"},{"inputs":[{"internalType":"bytes","name":"_message","type":"bytes"}],"name":"passMessageToL1","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"sentMessages","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]

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