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Contract

0x15c796d5575BFc8E8d7e285208c7ed4359507036
 

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Release196475152024-04-13 15:22:5946 days ago1713021779IN
0x15c796d5...359507036
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Release196013292024-04-07 4:06:2352 days ago1712462783IN
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Release195052042024-03-24 15:11:1166 days ago1711293071IN
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Claim193443312024-03-02 1:53:3589 days ago1709344415IN
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Claim192886002024-02-23 6:47:3596 days ago1708670855IN
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Claim192885792024-02-23 6:43:2396 days ago1708670603IN
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Claim192835822024-02-22 13:55:5997 days ago1708610159IN
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Claim192835742024-02-22 13:54:2397 days ago1708610063IN
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Release192382162024-02-16 4:53:47103 days ago1708059227IN
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Release192243682024-02-14 6:17:11105 days ago1707891431IN
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Release192102382024-02-12 6:44:23107 days ago1707720263IN
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Release191706742024-02-06 17:27:11113 days ago1707240431IN
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Release191511172024-02-03 23:32:11116 days ago1707003131IN
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Release191488012024-02-03 15:44:47116 days ago1706975087IN
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Release191462552024-02-03 7:10:23116 days ago1706944223IN
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Release191163752024-01-30 2:34:23121 days ago1706582063IN
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Release191154532024-01-29 23:28:11121 days ago1706570891IN
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Release191143462024-01-29 19:44:11121 days ago1706557451IN
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Release191129472024-01-29 15:02:11121 days ago1706540531IN
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Release191119602024-01-29 11:42:47121 days ago1706528567IN
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Release191109152024-01-29 8:12:47121 days ago1706515967IN
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Release191108922024-01-29 8:08:11121 days ago1706515691IN
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Release191108792024-01-29 8:05:35121 days ago1706515535IN
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Release191108522024-01-29 7:59:59121 days ago1706515199IN
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Release191106002024-01-29 7:08:59121 days ago1706512139IN
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0 ETH0.001220039.37415477
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Contract Source Code Verified (Exact Match)

Contract Name:
WENAirdrop

Compiler Version
v0.8.19+commit.7dd6d404

Optimization Enabled:
Yes with 5 runs

Other Settings:
default evmVersion
File 1 of 8 : WENAirdrop.sol
// SPDX-License-Identifier: MIT
/*
 __       __  ________  __    __ 
|  \  _  |  \|        \|  \  |  \
| $$ / \ | $$| $$$$$$$$| $$\ | $$
| $$/  $\| $$| $$__    | $$$\| $$
| $$  $$$\ $$| $$  \   | $$$$\ $$
| $$ $$\$$\$$| $$$$$   | $$\$$ $$
| $$$$  \$$$$| $$_____ | $$ \$$$$
| $$$    \$$$| $$     \| $$  \$$$
 \$$      \$$ \$$$$$$$$ \$$   \$$
*/

pragma solidity ^0.8.19;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";

interface IDelegationRegistry {
    function checkDelegateForContract(address delegate, address vault, address contract_)
        external
        view
        returns (bool);
}

/**
 * @title WENAirdrop
 */
contract WENAirdrop is Ownable, ReentrancyGuard {

    IDelegationRegistry immutable dc;

    event ClaimStatusUpdated(bool _isActive);
    event MerkleRootUpdated(bytes32 _merkleRoot);
    event Claimed(address indexed _address, uint256 _tokens);
    event Released(address indexed _address, uint256 _tokens);

    struct VestingSchedule {
        bool initialized;
        // start time of the vesting period
        uint256 start;
        // total amount of tokens to be released at the end of the vesting
        uint256 amountTotal;
        // amount of tokens released
        uint256 released;
    }

    // address of the ERC20 token
    address public immutable _token;
    // duration of the vesting period in seconds
    uint256 public immutable _duration;
    // merkle root for airdrop
    bytes32 public _merkleRoot;
    // claim status
    bool public _claimIsActive;
    // total amount vesting
    uint256 public vestingSchedulesTotalAmount;
    // vesing schedules
    mapping(address => VestingSchedule) public vestingSchedules;
    // tracks which beneficiaries have claimed their airdrop
    mapping(address => bool) public hasClaimed;
    
    /**
     * @dev Creates a vesting contract.
     * @param token_ address of the ERC20 token contract
     * @param duration_ of the vesting period in seconds
     * @param delegatecash_ is the delegate.cash contract address
     */
    constructor(address token_, uint256 duration_, address delegatecash_) {
        // Check that duration is greater than 0.
        require(duration_ > 0, "Bad duration");
        // Check that the token address is not 0x0.
        require(token_ != address(0x0), "Bad token address");
        // Check that delegate.cash address is not 0x0.
        require(delegatecash_ != address(0x0), "Bad delegate.cash address");
        // Set the token address.
        _token = token_;
        // Set the duration.
        _duration = duration_;
        // initialize delegate.cash
        dc = IDelegationRegistry(delegatecash_);
    }

    function setClaimStatus(bool claimIsActive_) external onlyOwner {
        _claimIsActive = claimIsActive_;
        emit ClaimStatusUpdated(claimIsActive_);
    }

    function setMerkleRoot(bytes32 merkleRoot_) external onlyOwner {
        _merkleRoot = merkleRoot_;
        emit MerkleRootUpdated(merkleRoot_);
    }

    /**
     * @notice Creates a new vesting schedule for a beneficiary and pays out 10% of _amount.
     * @param _address delegate.cash vault or msg.sender if delegate.cash isn't being used
     * @param _amount total amount (with 18 decimals) of tokens to be released at the end of the vesting
     * @param _proof merkle proof
     */
    function claim(
        address _address,
        uint256 _amount, 
        bytes32[] memory _proof
    ) external nonReentrant {
        // claim must be on for new vesting schedules to be created
        require(_claimIsActive, "Claim is off");
        // Check that _address is not 0x0.
        require(_address != address(0x0), "Bad address");
        if (_address != msg.sender) require(dc.checkDelegateForContract(msg.sender, _address, address(this)), "Unauthorized");
        // Make sure the vesting schedule hasn't already been created
        require(!hasClaimed[_address], "Already claimed");
        // Verify that the beneficiary is in the allowlist
        bytes32 _leaf = keccak256(abi.encode(_address, _amount));
        require(MerkleProof.verify(_proof, _merkleRoot, _leaf), "Bad proof");
        // Release 10% of tokens now and create a vesting schedule for the rest
        uint256 _initial = _amount * 10/100;
        createVestingSchedule(_address, _amount - _initial);
        IERC20(_token).transfer(_address, _initial);
        hasClaimed[_address] = true;
        emit Claimed(_address, _amount);
    }

    /**
     * @notice Creates a new vesting schedule for a beneficiary.
     * @param _beneficiary address of the beneficiary to whom vested tokens are transferred
     * @param _amount total amount of tokens to be released at the end of the vesting
     */
    function createVestingSchedule(address _beneficiary, uint256 _amount) 
        internal 
    {
        require(getWithdrawableAmount() >= _amount, "Insufficient tokens");
        require(_amount > 0, "Invalid amount");
        vestingSchedules[_beneficiary] = VestingSchedule(
            true,
            block.timestamp,
            _amount,
            0
        );
        vestingSchedulesTotalAmount = vestingSchedulesTotalAmount + _amount;
    }

    /**
     * @notice Release vested amount of tokens.
     * @param _address delegate.cash vault or msg.sender if delegate.cash isn't being used
     */
    function release(address _address) external nonReentrant {
        require(_address != address(0x0), "Bad address");
        if (_address != msg.sender) require(dc.checkDelegateForContract(msg.sender, _address, address(this)), "Unauthorized");
        require(vestingSchedules[_address].initialized);
        VestingSchedule storage vestingSchedule = vestingSchedules[_address];
        uint256 vestedAmount = _computeReleasableAmount(vestingSchedule);
        require(vestedAmount > 0, "None releasable");
        vestingSchedule.released = vestingSchedule.released + vestedAmount;
        vestingSchedulesTotalAmount = vestingSchedulesTotalAmount - vestedAmount;
        IERC20(_token).transfer(_address, vestedAmount);
        emit Released(_address, vestedAmount);
    }

    /**
     * @dev Computes the releasable amount of tokens for a vesting schedule.
     * @param _beneficiary address of the beneficiary to whom vested tokens are transferred
     * @return the amount of releasable tokens
     */
    function computeReleasableAmount(address _beneficiary)
        external
        view
        returns (uint256) {
        VestingSchedule storage vestingSchedule = vestingSchedules[_beneficiary];
        return _computeReleasableAmount(vestingSchedule);
    }

    /**
     * @dev Computes the releasable amount of tokens for a vesting schedule.
     * @param vestingSchedule that tracks the vesting of a beneficiary
     * @return the amount of releasable tokens
     */
    function _computeReleasableAmount(VestingSchedule memory vestingSchedule)
        internal 
        view 
        returns (uint256) {
        // Retrieve the current time.
        uint256 currentTime = block.timestamp;
        if (currentTime >= vestingSchedule.start + _duration) {
            // If the current time is after the vesting period, all tokens are releasable,
            // minus the amount already released.
            return vestingSchedule.amountTotal - vestingSchedule.released;
        } else {
            // Otherwise, some tokens are releasable.
            // Compute the number of seconds that have elapsed.
            uint256 vestedSeconds = currentTime - vestingSchedule.start;
            // Compute the amount of tokens that are vested.
            uint256 vestedAmount = (vestingSchedule.amountTotal * vestedSeconds) / _duration;
            // Subtract the amount already released and return.
            return vestedAmount - vestingSchedule.released;
        }
    }

    /**
     * @notice Withdraw the specified amount if possible.
     * @param amount the amount to withdraw
     */
    function withdraw(uint256 amount) external nonReentrant onlyOwner {
        require(getWithdrawableAmount() >= amount, "Insufficient funds");
        IERC20(_token).transfer(msg.sender, amount);
    }

    /**
     * @dev Returns the amount of tokens that can be withdrawn by the owner.
     * @return the amount of tokens
    */
    function getWithdrawableAmount() public view returns (uint256) {
        return IERC20(_token).balanceOf(address(this)) - vestingSchedulesTotalAmount;
    }
}

File 2 of 8 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @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 3 of 8 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

File 4 of 8 : IERC20.sol
// SPDX-License-Identifier: MIT
// 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 5 of 8 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

File 6 of 8 : Context.sol
// SPDX-License-Identifier: MIT
// 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 7 of 8 : MerkleProof.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Tree proofs.
 *
 * The tree and the proofs can be generated using our
 * https://github.com/OpenZeppelin/merkle-tree[JavaScript library].
 * You will find a quickstart guide in the readme.
 *
 * WARNING: You should avoid using leaf values that are 64 bytes long prior to
 * hashing, or use a hash function other than keccak256 for hashing leaves.
 * This is because the concatenation of a sorted pair of internal nodes in
 * the merkle tree could be reinterpreted as a leaf value.
 * OpenZeppelin's JavaScript library generates merkle trees that are safe
 * against this attack out of the box.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(
        bytes32[] memory proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }

    /**
     * @dev Calldata version of {verify}
     *
     * _Available since v4.7._
     */
    function verifyCalldata(
        bytes32[] calldata proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        return processProofCalldata(proof, leaf) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }

    /**
     * @dev Calldata version of {processProof}
     *
     * _Available since v4.7._
     */
    function processProofCalldata(bytes32[] calldata proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }

    /**
     * @dev Returns true if the `leaves` can be simultaneously proven to be a part of a merkle tree defined by
     * `root`, according to `proof` and `proofFlags` as described in {processMultiProof}.
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function multiProofVerify(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProof(proof, proofFlags, leaves) == root;
    }

    /**
     * @dev Calldata version of {multiProofVerify}
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function multiProofVerifyCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProofCalldata(proof, proofFlags, leaves) == root;
    }

    /**
     * @dev Returns the root of a tree reconstructed from `leaves` and sibling nodes in `proof`. The reconstruction
     * proceeds by incrementally reconstructing all inner nodes by combining a leaf/inner node with either another
     * leaf/inner node or a proof sibling node, depending on whether each `proofFlags` item is true or false
     * respectively.
     *
     * CAUTION: Not all merkle trees admit multiproofs. To use multiproofs, it is sufficient to ensure that: 1) the tree
     * is complete (but not necessarily perfect), 2) the leaves to be proven are in the opposite order they are in the
     * tree (i.e., as seen from right to left starting at the deepest layer and continuing at the next layer).
     *
     * _Available since v4.7._
     */
    function processMultiProof(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuild the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 totalHashes = proofFlags.length;

        // Check proof validity.
        require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof");

        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value for the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i] ? leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++] : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }

        if (totalHashes > 0) {
            return hashes[totalHashes - 1];
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }

    /**
     * @dev Calldata version of {processMultiProof}.
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function processMultiProofCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuild the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 totalHashes = proofFlags.length;

        // Check proof validity.
        require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof");

        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value for the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i] ? leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++] : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }

        if (totalHashes > 0) {
            return hashes[totalHashes - 1];
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }

    function _hashPair(bytes32 a, bytes32 b) private pure returns (bytes32) {
        return a < b ? _efficientHash(a, b) : _efficientHash(b, a);
    }

    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}

File 8 of 8 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 5
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

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

000000000000000000000000830a8512db4f6fca51968593e2667156c2c483a8000000000000000000000000000000000000000000000000000000000076a70000000000000000000000000000000000000076a84fef008cdabe6409d2fe638b

-----Decoded View---------------
Arg [0] : token_ (address): 0x830a8512db4F6fCA51968593E2667156C2c483A8
Arg [1] : duration_ (uint256): 7776000
Arg [2] : delegatecash_ (address): 0x00000000000076A84feF008CDAbe6409d2FE638B

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000830a8512db4f6fca51968593e2667156c2c483a8
Arg [1] : 000000000000000000000000000000000000000000000000000000000076a700
Arg [2] : 00000000000000000000000000000000000076a84fef008cdabe6409d2fe638b


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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.