usdt锁仓赚币源码（usdt锁仓挖矿）

USDT锁仓赚币源码是一种利用稳定币USDT进行锁仓操作以获取收益的方法。下面是一个简单的USDT锁仓赚币的源码示例： ```solidity pragma solidity ^0.8.0; import "./IERC20.sol"; contract USDTLock { IERC20 public usdt; address public owner; uint256 public lockDuration; // 锁仓期限 uint256 public lockStartTime; // 锁仓开始时间 struct Lock { uint256 amount; // 锁仓数量 uint256 releaseTime; // 解锁时间 } mapping(address => Lock) public locks; event Locked(address indexed account, uint256 amount, uint256 releaseTime); constructor(address _usdt, uint256 _lockDuration) { usdt = IERC20(_usdt); owner = msg.sender; lockDuration = _lockDuration; } modifier onlyOwner() { require(msg.sender == owner, "Only owner can call this function"); _; } function lock(uint256 _amount) external { require(_amount > 0, "Amount must be greater than zero"); require(usdt.transferFrom(msg.sender, address(this), _amount), "Transfer failed"); uint256 releaseTime = block.timestamp + lockDuration; locks[msg.sender] = Lock(_amount, releaseTime); emit Locked(msg.sender, _amount, releaseTime); } function unlock() external { require(locks[msg.sender].amount > 0, "No locked amount"); require(block.timestamp >= locks[msg.sender].releaseTime, "Lock duration not expired"); uint256 amount = locks[msg.sender].amount; locks[msg.sender].amount = 0; require(usdt.transfer(msg.sender, amount), "Transfer failed"); } function setLockDuration(uint256 _lockDuration) external onlyOwner { lockDuration = _lockDuration; } } ``` 以上是一个简单的USDT锁仓赚币的源码示例。该合约允许用户将USDT锁定在合约中一段时间，并在锁仓期满后解锁并收回USDT。合约的所有权由合约创建者拥有，只有合约创建者可以更改锁仓期限。用户可以通过调用`lock`函数将USDT锁定在合约中，然后在锁仓期满后调用`unlock`函数解锁并收回USDT。