Address Contract Verified
Address
0x7a6d98a6CC5c0f0029D6a26E987aA7e04FA5da03
Balance
0 ETH
Nonce
1
Code Size
3112 bytes
Creator
0x19092089...F509 at tx 0xc291bb90...c07b16
Indexed Transactions
0
Contract Bytecode
3112 bytes
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Verified Source Code Full Match
Compiler: v0.8.31+commit.fd3a2265
EVM: prague
Optimization: Yes (200 runs)
MerkleRefund.sol 188 lines
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
/// @notice 简单的 ERC20 接口（保留返回值定义，但不会直接用它）
interface IERC20 {
function transfer(address to, uint256 value) external returns (bool);
function transferFrom(address from, address to, uint256 value) external returns (bool);
function balanceOf(address account) external view returns (uint256);
}
/// @notice MerkleProof 库（简化版）
library MerkleProof {
function verify(
bytes32[] memory proof,
bytes32 root,
bytes32 leaf
) internal pure returns (bool) {
return processProof(proof, leaf) == root;
}
function processProof(
bytes32[] memory proof,
bytes32 leaf
) internal pure returns (bytes32) {
bytes32 computedHash = leaf;
for (uint256 i = 0; i < proof.length; i++) {
bytes32 proofElement = proof[i];
if (computedHash <= proofElement) {
computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
} else {
computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
}
}
return computedHash;
}
}
/// @notice Ownable
contract Ownable {
address public owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor() {
owner = msg.sender;
emit OwnershipTransferred(address(0), msg.sender);
}
modifier onlyOwner() {
require(msg.sender == owner, "Not owner");
_;
}
function transferOwnership(address newOwner) external onlyOwner {
require(newOwner != address(0), "zero addr");
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
contract MerkleRefund is Ownable {
IERC20 public immutable token = IERC20(0x044Ca854fA227E27E07652B7F6A6b578703F3945); // 用户要扣的代币
IERC20 public immutable usdt = IERC20(0x3bEF807ac66522d7759cAf07b668a7eb00e1D00E); // 合约退给用户的 USDT（以太坊 CUSDT）
bytes32 public merkleRoot;
struct UserUsage {
uint256 tokenUsed;
uint256 usdtUsed;
}
mapping(address => UserUsage) public userUsage;
event MerkleRootSet(bytes32 root);
event Refunded(
address indexed user,
uint256 tokenIn,
uint256 usdtOut,
uint256 tokenTotalAllocated,
uint256 usdtTotalAllocated
);
constructor(bytes32 _root) {
merkleRoot = _root;
emit MerkleRootSet(_root);
}
/// @notice 设置 Merkle Root（如需多次更新可以去掉 require 限制）
function setMerkleRoot(bytes32 _root) external onlyOwner {
merkleRoot = _root;
emit MerkleRootSet(_root);
}
/**
* @notice 用户退款
* @param tokenTotal 用户在 Merkle 中的 token 总额度
* @param usdtTotal 用户在 Merkle 中的 usdt 总额度
* @param merkleProof Merkle 证明
*
* 叶子: keccak256(abi.encodePacked(user, tokenTotal, usdtTotal))
*/
function refund(
uint256 tokenTotal,
uint256 usdtTotal,
bytes32[] calldata merkleProof
) external {
require(merkleRoot != bytes32(0), "root not set");
bytes32 leaf = keccak256(
abi.encodePacked(msg.sender, tokenTotal, usdtTotal)
);
require(MerkleProof.verify(merkleProof, merkleRoot, leaf), "Invalid proof");
UserUsage memory usage = userUsage[msg.sender];
require(tokenTotal >= usage.tokenUsed, "tokenTotal < used");
require(usdtTotal >= usage.usdtUsed, "usdtTotal < used");
uint256 tokenToUse = tokenTotal - usage.tokenUsed;
uint256 usdtToUse = usdtTotal - usage.usdtUsed;
require(tokenToUse > 0 || usdtToUse > 0, "Nothing to claim");
// 先更新状态，防止重入
userUsage[msg.sender].tokenUsed = tokenTotal;
userUsage[msg.sender].usdtUsed = usdtTotal;
// 从用户扣 token
if (tokenToUse > 0) {
_safeTransferFrom(token, msg.sender, address(this), tokenToUse);
}
// 合约给用户转 USDT
if (usdtToUse > 0) {
require(
usdt.balanceOf(address(this)) >= usdtToUse,
"insufficient USDT in contract"
);
_safeTransfer(usdt, msg.sender, usdtToUse);
}
emit Refunded(
msg.sender,
tokenToUse,
usdtToUse,
tokenTotal,
usdtTotal
);
}
// ================= SafeERC20 风格函数 =================
function _safeTransfer(
IERC20 _token,
address to,
uint256 value
) internal {
(bool success, bytes memory data) = address(_token).call(
abi.encodeWithSelector(_token.transfer.selector, to, value)
);
require(
success && (data.length == 0 || abi.decode(data, (bool))),
"TRANSFER_FAILED"
);
}
function _safeTransferFrom(
IERC20 _token,
address from,
address to,
uint256 value
) internal {
(bool success, bytes memory data) = address(_token).call(
abi.encodeWithSelector(_token.transferFrom.selector, from, to, value)
);
require(
success && (data.length == 0 || abi.decode(data, (bool))),
"TRANSFER_FROM_FAILED"
);
}
/// @notice 管理员提取合约内的 USDT（紧急或清算使用）
function adminWithdrawUSDT(address to, uint256 amount) external onlyOwner {
require(to != address(0), "zero addr");
require(amount > 0, "amount zero");
_safeTransfer(usdt, to, amount);
}
}
Read Contract
merkleRoot 0x2eb4a7ab → bytes32
owner 0x8da5cb5b → address
token 0xfc0c546a → address
usdt 0x2f48ab7d → address
userUsage 0xc18402fa → uint256, uint256
Write Contract 4 functions
These functions modify contract state and require a wallet transaction to execute.
adminWithdrawUSDT 0x6fe3bc08
address to
uint256 amount
refund 0xedca76bc
uint256 tokenTotal
uint256 usdtTotal
bytes32[] merkleProof
setMerkleRoot 0x7cb64759
bytes32 _root
transferOwnership 0xf2fde38b
address newOwner
Token Balances (1)
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