Bitcoin Forum

//SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.0;


import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract KeyedBitcoin {
    IERC20 public wbtcToken;
    address public owner;
    uint256 public totalKeyed;

   
    mapping(address => uint256) public keyedBalances;

   
    event Sent(address indexed from, uint256 amount);
    event Transferred(address indexed from, address indexed to, uint256 amount);

   
    constructor(address _wbtcToken) {
        wbtcToken = IERC20(_wbtcToken);
        owner = msg.sender;
    }

   
    function transfer(uint256 _amount) public {
        require(_amount > 0, "Amount must be greater than zero");

   
        require(wbtcToken.transfer(address(this), _amount), "Transfer failed");

   
        keyedBalances[msg.sender] += _amount;
        totalKeyed += _amount;

        emit Sent(msg.sender, _amount);
    }

   
    function throw_keys(address _to, uint256 _amount) public {
        require(_to != address(0), "Cannot transfer to the zero address");
        require(keyedBalances[msg.sender] >= _amount, "Insufficient balance");

   
        keyedBalances[msg.sender] -= _amount;
        keyedBalances[_to] += _amount;

        emit Transferred(msg.sender, _to, _amount);
    }

   
    function withdraw(uint256 _amount) public {
        require(msg.sender == owner, "Only owner can withdraw");
        require(wbtcToken.balanceOf(address(this)) >= _amount, "Insufficient WBTC balance");

        wbtcToken.transfer(owner, _amount);
    }
}