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Method
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Withdraw217487272025-02-01 2:36:353 days ago1738377395IN
Hakka Finance: Vesting
0 ETH0.00011731.73759023
Withdraw217411862025-01-31 1:19:114 days ago1738286351IN
Hakka Finance: Vesting
0 ETH0.000095651.41688512
Withdraw217410082025-01-31 0:43:354 days ago1738284215IN
Hakka Finance: Vesting
0 ETH0.000094241.39592493
Withdraw217231142025-01-28 12:46:236 days ago1738068383IN
Hakka Finance: Vesting
0 ETH0.000307434.55376389
Withdraw216574492025-01-19 8:50:1115 days ago1737276611IN
Hakka Finance: Vesting
0 ETH0.0016861324.97504037
Withdraw216448082025-01-17 14:27:5917 days ago1737124079IN
Hakka Finance: Vesting
0 ETH0.000612129.06683627
Withdraw216272742025-01-15 3:42:5920 days ago1736912579IN
Hakka Finance: Vesting
0 ETH0.000273594.05253892
Withdraw216203712025-01-14 4:35:5921 days ago1736829359IN
Hakka Finance: Vesting
0 ETH0.000124731.84760065
Withdraw216110422025-01-12 21:17:2322 days ago1736716643IN
Hakka Finance: Vesting
0 ETH0.000155172.29846017
Withdraw215982722025-01-11 2:31:1124 days ago1736562671IN
Hakka Finance: Vesting
0 ETH0.000165872.45693909
Withdraw215982332025-01-11 2:23:2324 days ago1736562203IN
Hakka Finance: Vesting
0 ETH0.000211743.13632201
Withdraw215976472025-01-11 0:25:2324 days ago1736555123IN
Hakka Finance: Vesting
0 ETH0.000246383.64942458
Withdraw215571932025-01-05 8:50:3529 days ago1736067035IN
Hakka Finance: Vesting
0 ETH0.000299795.94682851
Withdraw215280802025-01-01 7:19:4733 days ago1735715987IN
Hakka Finance: Vesting
0 ETH0.000288674.27578963
Withdraw215123312024-12-30 2:32:3536 days ago1735525955IN
Hakka Finance: Vesting
0 ETH0.000182473.61958787
Withdraw215083012024-12-29 13:03:2336 days ago1735477403IN
Hakka Finance: Vesting
0 ETH0.000356985.28770309
Withdraw214828592024-12-25 23:46:5940 days ago1735170419IN
Hakka Finance: Vesting
0 ETH0.000256543.8
Withdraw214813402024-12-25 18:41:1140 days ago1735152071IN
Hakka Finance: Vesting
0 ETH0.000226854.5
Withdraw214462232024-12-20 20:49:1145 days ago1734727751IN
Hakka Finance: Vesting
0 ETH0.0007068314.02084466
Withdraw214096592024-12-15 18:19:1150 days ago1734286751IN
Hakka Finance: Vesting
0 ETH0.000437078.66992504
Withdraw214094712024-12-15 17:40:5950 days ago1734284459IN
Hakka Finance: Vesting
0 ETH0.0005945411.79343538
Withdraw214038162024-12-14 22:43:5951 days ago1734216239IN
Hakka Finance: Vesting
0 ETH0.0007997411.84582677
Withdraw214038082024-12-14 22:42:2351 days ago1734216143IN
Hakka Finance: Vesting
0 ETH0.0008808813.04769207
Withdraw213998712024-12-14 9:30:5951 days ago1734168659IN
Hakka Finance: Vesting
0 ETH0.000526767.80245455
Withdraw213998142024-12-14 9:19:3551 days ago1734167975IN
Hakka Finance: Vesting
0 ETH0.000407968.0925433
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Contract Source Code Verified (Exact Match)

Contract Name:
VestingVault

Compiler Version
v0.5.17+commit.d19bba13

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, GNU AGPLv3 license
/**
 *Submitted for verification at Etherscan.io on 2020-12-08
*/

pragma solidity 0.5.17;

library SafeMath {

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) 
            return 0;
        uint256 c = a * b;
        require(c / a == b);
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0);
        uint256 c = a / b;
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;
        return c;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);
        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0);
        return a % b;
    }
}

contract Ownable {
    address public owner;

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

    constructor() public {
        owner = msg.sender;
    }

    modifier onlyOwner() {
        require(msg.sender == owner, "permission denied");
        _;
    }

    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0), "invalid address");
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }
}

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);
}

library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * This test is non-exhaustive, and there may be false-negatives: during the
     * execution of a contract's constructor, its address will be reported as
     * not containing a contract.
     *
     * IMPORTANT: It is unsafe to assume that an address for which this
     * function returns false is an externally-owned account (EOA) and not a
     * contract.
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != 0x0 && codehash != accountHash);
    }

    /**
     * @dev Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-call-value
        (bool success, ) = recipient.call.value(amount)("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
}

library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

contract VestingVault is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    IERC20 public constant hakka = IERC20(0x0E29e5AbbB5FD88e28b2d355774e73BD47dE3bcd);

    uint256 public constant vestingPeriod = 19 days;
    uint256 public constant proportion = 173831376164413312; //17.38%

    mapping(address => uint256) public balanceOf;
    mapping(address => uint256) public lastWithdrawalTime;

    event Deposit(address indexed from, address indexed to, uint256 amount);
    event Withdraw(address indexed from, uint256 amount);

    function deposit(address to, uint256 amount) external {
        hakka.safeTransferFrom(msg.sender, address(this), amount);
        balanceOf[to] = balanceOf[to].add(amount);

        emit Deposit(msg.sender, to, amount);
    }

    function withdraw() external returns (uint256 amount) {
        address from = msg.sender;
        require(lastWithdrawalTime[from].add(vestingPeriod) < now);
        lastWithdrawalTime[from] = now;
        amount = balanceOf[from].mul(proportion).div(1e18);
        balanceOf[from] = balanceOf[from].sub(amount);
        hakka.safeTransfer(from, amount);

        emit Withdraw(msg.sender, amount);
    }

    function inCaseTokenGetsStuckPartial(IERC20 _TokenAddress, uint256 _amount) onlyOwner public {
        require(_TokenAddress != hakka);
        _TokenAddress.safeTransfer(msg.sender, _amount);
    }

}

Contract Security Audit

Contract ABI

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"deposit","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"hakka","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20","name":"_TokenAddress","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"inCaseTokenGetsStuckPartial","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"lastWithdrawalTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"proportion","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"vestingPeriod","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"withdraw","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

bzzr://8d1de3a00c12e5a1a946ad4c5fc3172ff0f5ce2d6bf4ed935a1aac0ee7a79be1

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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OVERVIEW

This is the vesting contract of Hakka Finance's liquidity mining reward.

Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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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.