46. N-of-M multisig

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract Multisig {
    mapping(address => bool) public isOwner;
    uint256 public threshold;
    struct Tx { address to; uint256 value; bytes data; uint256 confirms; bool done; }
    Tx[] public txs;
    mapping(uint256 => mapping(address => bool)) public confirmed;
    constructor(address[] memory owners, uint256 t) {
        for (uint i; i<owners.length; i++) isOwner[owners[i]] = true;
        threshold = t;
    }
    function submit(address to, uint256 value, bytes calldata data) external returns (uint256 id) { /* TODO */ }
    function confirm(uint256 id) external { /* TODO */ }
    function execute(uint256 id) external { /* TODO */ }
    receive() external payable {}
}