ETH Price: $1,644.45 (-1.28%)
Gas: 6 Gwei
 

Overview

ETH Balance

0 ETH

Eth Value

$0.00

Token Holdings

Transaction Hash
Method
Block
From
To
Value
Withdraw ETH172612752023-05-14 23:13:35142 days 4 hrs ago1684106015IN
0x5702E3...9437B5f6
0 ETH0.0009803732.18661236
Claim Tokens172610122023-05-14 22:19:23142 days 5 hrs ago1684102763IN
0x5702E3...9437B5f6
0.05 ETH0.0027183738.50387535
Claim Tokens172584012023-05-14 13:30:11142 days 14 hrs ago1684071011IN
0x5702E3...9437B5f6
0.05 ETH0.0021846240.84336367
Withdraw ETH172583662023-05-14 13:23:11142 days 14 hrs ago1684070591IN
0x5702E3...9437B5f6
0 ETH0.0013775245.2254626
Claim Tokens172582762023-05-14 13:04:23142 days 14 hrs ago1684069463IN
0x5702E3...9437B5f6
0.05 ETH0.0032039945.38238934
Claim Tokens172582452023-05-14 12:57:59142 days 14 hrs ago1684069079IN
0x5702E3...9437B5f6
0.05 ETH0.0029966842.44595528
Claim Tokens172582442023-05-14 12:57:47142 days 14 hrs ago1684069067IN
0x5702E3...9437B5f6
0.05 ETH0.0026647337.7504991
Claim Tokens172582312023-05-14 12:55:11142 days 14 hrs ago1684068911IN
0x5702E3...9437B5f6
0.05 ETH0.0029710642.08312239
Claim Tokens172582302023-05-14 12:54:59142 days 14 hrs ago1684068899IN
0x5702E3...9437B5f6
0.05 ETH0.0029960442.44410127
Claim Tokens172582002023-05-14 12:48:59142 days 14 hrs ago1684068539IN
0x5702E3...9437B5f6
0.05 ETH0.0017367340.28155636
Claim Tokens172581992023-05-14 12:48:47142 days 14 hrs ago1684068527IN
0x5702E3...9437B5f6
0.05 ETH0.01261191191.67041494
Claim Tokens172581972023-05-14 12:48:23142 days 14 hrs ago1684068503IN
0x5702E3...9437B5f6
0.05 ETH0.0028845340.85738091
Claim Tokens172581952023-05-14 12:47:59142 days 14 hrs ago1684068479IN
0x5702E3...9437B5f6
0.05 ETH0.0028970841.03517827
Claim Tokens172581912023-05-14 12:47:11142 days 14 hrs ago1684068431IN
0x5702E3...9437B5f6
0.05 ETH0.0028132739.85489552
Claim Tokens172581852023-05-14 12:45:59142 days 14 hrs ago1684068359IN
0x5702E3...9437B5f6
0.05 ETH0.003030442.92360586
Claim Tokens172581802023-05-14 12:44:59142 days 14 hrs ago1684068299IN
0x5702E3...9437B5f6
0.05 ETH0.0029270841.460095
Claim Tokens172581782023-05-14 12:44:35142 days 14 hrs ago1684068275IN
0x5702E3...9437B5f6
0.05 ETH0.002970142.0695157
Claim Tokens172581762023-05-14 12:44:11142 days 14 hrs ago1684068251IN
0x5702E3...9437B5f6
0.05 ETH0.0030240542.83364959
Claim Tokens172581722023-05-14 12:43:23142 days 14 hrs ago1684068203IN
0x5702E3...9437B5f6
0.05 ETH0.0027474238.91534841
Claim Tokens172581702023-05-14 12:42:59142 days 14 hrs ago1684068179IN
0x5702E3...9437B5f6
0.05 ETH0.0028490240.35442261
Claim Tokens172581542023-05-14 12:39:23142 days 14 hrs ago1684067963IN
0x5702E3...9437B5f6
0.05 ETH0.0028067142.66308838
Claim Tokens172581502023-05-14 12:38:23142 days 14 hrs ago1684067903IN
0x5702E3...9437B5f6
0.05 ETH0.0028051339.73284345
Claim Tokens172581422023-05-14 12:36:47142 days 14 hrs ago1684067807IN
0x5702E3...9437B5f6
0.05 ETH0.0028520740.39765158
Claim Tokens172581412023-05-14 12:36:35142 days 14 hrs ago1684067795IN
0x5702E3...9437B5f6
0.05 ETH0.0028742240.7182644
Claim Tokens172581412023-05-14 12:36:35142 days 14 hrs ago1684067795IN
0x5702E3...9437B5f6
0.05 ETH0.002874740.7182644
View all transactions

Latest 2 internal transactions

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Parent Txn Hash Block From To Value
172612752023-05-14 23:13:35142 days 4 hrs ago1684106015
0x5702E3...9437B5f6
0.1 ETH
172583662023-05-14 13:23:11142 days 14 hrs ago1684070591
0x5702E3...9437B5f6
33.6 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
GENPresale

Compiler Version
v0.8.18+commit.87f61d96

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license
/**
 *Submitted for verification at Etherscan.io on 2023-05-13
*/

// SPDX-License-Identifier: MIT

// File: @openzeppelin/contracts/utils/Context.sol


// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: contracts/GenPresale.sol


pragma solidity ^0.8.0;



contract GENPresale is Ownable {
    IERC20 public genToken;
    uint256 public claimAmount = 105172500000 ether; 
    uint256 public ethAmount = 0.05 ether;
    address public serverAddress; // The address corresponding to the backend server's private key

    constructor(address _tokenAddress, address _serverAddress) {
        genToken = IERC20(_tokenAddress);
        serverAddress = _serverAddress;
    }

    function setTokenAddress(address _tokenAddress) external onlyOwner {
        genToken = IERC20(_tokenAddress);
    }

    function setServerAddress(address _serverAddress) external onlyOwner {
        serverAddress = _serverAddress;
    }

    function setClaimAmount(uint256 _claimAmount) external onlyOwner {
        claimAmount = _claimAmount;
    }

    function setEthAmount(uint256 _ethAmount) external onlyOwner {
        ethAmount = _ethAmount;
    }

    function claimTokens(bytes32 r, bytes32 s, uint8 v, uint256 nonce) external payable {
        require(msg.value == ethAmount, "Incorrect ETH amount");

        // Construct the message that was signed on the backend
        bytes32 message = keccak256(abi.encodePacked(msg.sender, nonce));

        // Recover the address from the signature
        address recoveredAddress = ecrecover(message, v, r, s);

        // Check the recovered address against the server address
        require(recoveredAddress == serverAddress, "Invalid signature");

        genToken.transfer(msg.sender, claimAmount);
    }

    function withdrawETH() external onlyOwner {
        payable(owner()).transfer(address(this).balance);
    }

    function withdrawGEN() external onlyOwner {
        uint256 balance = genToken.balanceOf(address(this));
        require(balance > 0, "No GEN tokens to withdraw");
        genToken.transfer(owner(), balance);
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"_tokenAddress","type":"address"},{"internalType":"address","name":"_serverAddress","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"claimAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"uint256","name":"nonce","type":"uint256"}],"name":"claimTokens","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"ethAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"genToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"serverAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_claimAmount","type":"uint256"}],"name":"setClaimAmount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_ethAmount","type":"uint256"}],"name":"setEthAmount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_serverAddress","type":"address"}],"name":"setServerAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddress","type":"address"}],"name":"setTokenAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawETH","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawGEN","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000d2d6bb4c0953349949f991d0bdae4f0b9c40e0730000000000000000000000000d4ed5aae3a7f7c053f8759433436a03f01c7a81

Deployed Bytecode

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000d2d6bb4c0953349949f991d0bdae4f0b9c40e0730000000000000000000000000d4ed5aae3a7f7c053f8759433436a03f01c7a81

-----Decoded View---------------
Arg [0] : _tokenAddress (address): 0xd2d6bb4c0953349949f991d0BDaE4f0b9c40E073
Arg [1] : _serverAddress (address): 0x0D4Ed5aAE3A7F7C053f8759433436a03F01c7A81

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000d2d6bb4c0953349949f991d0bdae4f0b9c40e073
Arg [1] : 0000000000000000000000000d4ed5aae3a7f7c053f8759433436a03f01c7a81


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Swarm Source

ipfs://0cef6794a10d523168dee97cab05df4929ff1ec1faa270719e30afe55c225522

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.