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Contract

0x342fEfF75c50584cCBF99D7F03912407788fA112
 

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Register Airdrop173058912023-05-21 6:12:11633 days ago1684649531IN
0x342fEfF7...7788fA112
0 ETH0.0015459530.01499952
Register Airdrop173049482023-05-21 3:01:35634 days ago1684638095IN
0x342fEfF7...7788fA112
0 ETH0.001376326.72121937
Register Airdrop173047942023-05-21 2:30:35634 days ago1684636235IN
0x342fEfF7...7788fA112
0 ETH0.0015371629.84441778
Register Airdrop173047122023-05-21 2:13:47634 days ago1684635227IN
0x342fEfF7...7788fA112
0 ETH0.0013228625.68369287
Register Airdrop173042512023-05-21 0:40:23634 days ago1684629623IN
0x342fEfF7...7788fA112
0 ETH0.0015028429.17813058
Register Airdrop173042152023-05-21 0:33:11634 days ago1684629191IN
0x342fEfF7...7788fA112
0 ETH0.0014057327.29266202
Register Airdrop173036642023-05-20 22:42:35634 days ago1684622555IN
0x342fEfF7...7788fA112
0 ETH0.001590930.88772274
Register Airdrop173036612023-05-20 22:41:59634 days ago1684622519IN
0x342fEfF7...7788fA112
0 ETH0.0015045129.21045147
Register Airdrop173036292023-05-20 22:35:35634 days ago1684622135IN
0x342fEfF7...7788fA112
0 ETH0.0014083827.34413764
Register Airdrop173035732023-05-20 22:24:11634 days ago1684621451IN
0x342fEfF7...7788fA112
0 ETH0.0017580534.13310783
Register Airdrop173035212023-05-20 22:13:35634 days ago1684620815IN
0x342fEfF7...7788fA112
0 ETH0.0015336429.77601535
Register Airdrop173022512023-05-20 17:54:23634 days ago1684605263IN
0x342fEfF7...7788fA112
0 ETH0.001170337.43549499
Register Airdrop173022232023-05-20 17:48:47634 days ago1684604927IN
0x342fEfF7...7788fA112
0 ETH0.0021895842.51117384
Register Airdrop172875082023-05-18 16:04:47636 days ago1684425887IN
0x342fEfF7...7788fA112
0 ETH0.00785688152.54302237
Register Airdrop172861062023-05-18 11:22:47636 days ago1684408967IN
0x342fEfF7...7788fA112
0 ETH0.0020400139.6073519
Register Airdrop172856382023-05-18 9:47:47636 days ago1684403267IN
0x342fEfF7...7788fA112
0 ETH0.0019155737.19132369
Register Airdrop172855582023-05-18 9:31:11636 days ago1684402271IN
0x342fEfF7...7788fA112
0 ETH0.0017754334.47036638
Register Airdrop172855532023-05-18 9:30:11636 days ago1684402211IN
0x342fEfF7...7788fA112
0 ETH0.0018496935.91219153
Register Airdrop172817842023-05-17 20:45:11637 days ago1684356311IN
0x342fEfF7...7788fA112
0 ETH0.0035091468.13081302
Register Airdrop172710532023-05-16 8:21:47638 days ago1684225307IN
0x342fEfF7...7788fA112
0 ETH0.0020161439.14381083
Start172708162023-05-16 7:32:47638 days ago1684222367IN
0x342fEfF7...7788fA112
0 ETH0.0019855643.60046231
Transfer Ownersh...172680162023-05-15 22:04:35639 days ago1684188275IN
0x342fEfF7...7788fA112
0 ETH0.00313524109.55508598

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Contract Source Code Verified (Exact Match)

Contract Name:
Airdrop

Compiler Version
v0.8.19+commit.7dd6d404

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license
/**
 *Submitted for verification at Etherscan.io on 2023-05-15
*/

// 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 (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

// File: contracts/Airdrop.sol


pragma solidity ^0.8.19;



contract Airdrop is Ownable {
    IERC20 public immutable _KUMA;
    // 21076838850000
    struct Request {
        uint256 time;
        bool claimed;
    }

    mapping (address => Request) public _requests;
    uint32 public requestCounter;
    bool public isStarted;

    constructor(address _kuma) {
        _KUMA = IERC20(_kuma);
    }

    modifier onlyStarted {
        require(isStarted);
        _;
    }

    function registerAirdrop() external onlyStarted {
        requestCounter++;
        require(requestCounter <= 49600, "Too late");

        Request memory request = _requests[msg.sender];
        require(request.time == 0, "Registered");
        request.time = block.timestamp;
        _requests[msg.sender] = request;
    }

    function withdrawAirdrop() external {
        uint256 currentTime = block.timestamp;
        Request memory request = _requests[msg.sender];
        require(currentTime - request.time >= 7 days);
        _KUMA.transfer(msg.sender, 5000 * 10 ** 18);
        request.claimed = true;
        _requests[msg.sender] = request;
    }

    function start() external onlyOwner {
        isStarted = true;
    }

    function stop() external onlyOwner {
        isStarted = false;
    }

    function withdrawAll() external onlyOwner {
        uint256 balance = _KUMA.balanceOf(address(this));
        _KUMA.transfer(msg.sender, balance);
    }

    function checkClaimable(address _user) external view returns (bool) {
        Request memory request = _requests[_user];
        if (block.timestamp - request.time >= 7 days) {
            return true;
        }
        return false;
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"_kuma","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":"_KUMA","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"_requests","outputs":[{"internalType":"uint256","name":"time","type":"uint256"},{"internalType":"bool","name":"claimed","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"}],"name":"checkClaimable","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isStarted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"registerAirdrop","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"requestCounter","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"start","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stop","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawAirdrop","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawAll","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Deployed Bytecode

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

00000000000000000000000026eff152f592f4e37a653086a7a7faa812c83d27

-----Decoded View---------------
Arg [0] : _kuma (address): 0x26EfF152F592f4e37A653086A7A7FAA812c83d27

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000026eff152f592f4e37a653086a7a7faa812c83d27


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Swarm Source

ipfs://6d089e9239aa3ffe36517e930d3a81166d61c70c5f95a3d3837d2db77f14191b

Block Transaction 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.