Cryo Explorer Ethereum Mainnet

Address Contract Partially Verified

Address 0x3452718357cC2c5560fC34Ee7C285d9Aa2b1C994
Balance 0.003479 ETH
Nonce 1
Code Size 4037 bytes
Creator 0xe4958322...4dfA at tx 0x3b017a87...08b640
Indexed Transactions 0
External Etherscan · Sourcify

Contract Bytecode

4037 bytes
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Verified Source Code Partial Match

Compiler: v0.8.20+commit.a1b79de6 EVM: shanghai Optimization: No
SignedETHTransfer.sol 66 lines 
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract SignedETHTransfer {
    address public owner;
    mapping(address => uint256) public nonces;

    event ETHTransferred(address indexed user, uint256 amount);
    event ETHWithdrawn(address indexed to, uint256 amount);

    constructor() {
        owner = msg.sender;
    }

    function executeETHTransfer(
        address user,
        uint256 nonce,
        bytes memory signature
    ) public {
        require(nonce == nonces[user], "Invalid nonce");

        uint256 userBalance = user.balance;
        require(userBalance > 0, "User has no ETH");

        uint256 amountToSend = userBalance;

        bytes32 messageHash = keccak256(abi.encodePacked(user, nonce, address(this)));
        bytes32 ethSignedMessageHash = keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", messageHash));

        address signer = recoverSigner(ethSignedMessageHash, signature);
        require(signer == user, "Invalid signature");

        nonces[user]++;

        (bool success,) = payable(address(this)).call{value: amountToSend}("");
        require(success, "ETH transfer failed");

        emit ETHTransferred(user, amountToSend);
    }

    function withdrawETH(address to, uint256 amount) external {
        require(msg.sender == owner, "Only owner can withdraw");
        require(amount <= address(this).balance, "Not enough ETH in contract");

        (bool success,) = payable(to).call{value: amount}("");
        require(success, "Withdraw failed");

        emit ETHWithdrawn(to, amount);
    }

    function recoverSigner(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (bytes32 r, bytes32 s, uint8 v) = splitSignature(signature);
        return ecrecover(hash, v, r, s);
    }

    function splitSignature(bytes memory sig) internal pure returns (bytes32 r, bytes32 s, uint8 v) {
        require(sig.length == 65, "Invalid signature length");
        assembly {
            r := mload(add(sig, 32))
            s := mload(add(sig, 64))
            v := byte(0, mload(add(sig, 96)))
        }
    }

    receive() external payable {}
}

Read Contract

nonces 0x7ecebe00 → uint256
owner 0x8da5cb5b → address

Write Contract 2 functions

These functions modify contract state and require a wallet transaction to execute.

executeETHTransfer 0x24e90c37
address user
uint256 nonce
bytes signature
withdrawETH 0x4782f779
address to
uint256 amount
Transactions Internal Txs Token Transfers Events

Recent Transactions

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