Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: CC0-1.0
pragma solidity ^0.8.4;

/// @title 1-of-1 smart contract wallet with rotatable ownership for counterfactually receiving tokens at the same address across many EVM chains
contract Singlesig {
    address public owner;
    address public pendingOwner;

    event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner);
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /// @dev Initializes the contract setting the address provided by the deployer as the initial owner
    /// @dev Distinct constructor args will lead to distinct CREATE2 initialization bytecode, so no collision risk here
    constructor(address initialOwner) {
        owner = initialOwner;
        emit OwnershipTransferred(address(0), initialOwner);
    }

    /// @dev Throws if called by any account other than the owner
    modifier onlyOwner() {
        require(owner == msg.sender, "Ownable2Step: caller is not the owner");
        _;
    }

    /// @notice Executes a call with provided parameters
    /// @dev This method doesn't perform any sanity check of the transaction
    /// @param to Destination address
    /// @param value Native token value in wei
    /// @param data Data payload
    /// @return success Boolean flag indicating if the call succeeded
    function execute(address to, uint256 value, bytes memory data) public onlyOwner returns (bool success) {
        (success,) = to.call{value: value}(data);
    }

    /// @dev Offers to transfer ownership permissions to a new account
    function transferOwnership(address newOwner) external onlyOwner {
        pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner, newOwner);
    }

    /// @dev The new owner accepts the ownership transfer
    function acceptOwnership() external {
        require(pendingOwner == msg.sender, "Ownable2Step: caller is not the new owner");
        emit OwnershipTransferred(owner, pendingOwner);
        owner = pendingOwner;
    }

    /// @dev Function to receive native tokens when `msg.data` is empty
    receive() external payable {}

    /// @dev Fallback function is called when `msg.data` is not empty
    fallback() external payable {}

    function supportsInterface(bytes4 interfaceId) external pure returns (bool) {
        return interfaceId == 0x01ffc9a7 // ERC165 Interface ID for ERC165
            || interfaceId == 0x150b7a02 // ERC165 Interface ID for ERC721TokenReceiver
            || interfaceId == 0x4e2312e0; // ERC165 Interface ID for ERC1155TokenReceiver
    }

    function onERC721Received(address, address, uint256, bytes calldata) external pure returns (bytes4) {
        return 0x150b7a02; //bytes4(keccak256("onERC721Received(address,uint256,bytes)"));
    }

    function onERC1155Received(address, address, uint256, uint256, bytes calldata) external pure returns (bytes4) {
        return 0xf23a6e61; // bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"));
    }

    function onERC1155BatchReceived(address, address, uint256[] calldata, uint256[] calldata, bytes calldata) external pure returns (bytes4) {
        return 0xbc197c81; // bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))
    }
}

{
  "viaIR": false,
  "codegen": "yul",
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "murky/=lib/murky/src/",
    "openzeppelin/=lib/openzeppelin-contracts/contracts/",
    "era-contracts/=lib/era-contracts/"
  ],
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "abi",
        "metadata"
      ],
      "": [
        "ast"
      ]
    }
  },
  "optimizer": {
    "enabled": true,
    "mode": "3",
    "fallback_to_optimizing_for_size": false,
    "disable_system_request_memoization": true
  },
  "metadata": {},
  "libraries": {},
  "enableEraVMExtensions": false,
  "forceEVMLA": false
}

[{"inputs":[{"internalType":"address","name":"initialOwner","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferStarted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"acceptOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"execute","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC1155BatchReceived","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC1155Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC721Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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