Contract 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e

Contract Overview

Balance:
0 CRO

CRO Value:
$0.00

Token:
Txn Hash Method
Block
From
To
Value [Txn Fee]
0xae5e8206c6fefbf7f6d54f92e915711129c2a7272a899914e2198948a2d27f90Claim Charge Fee85314172023-05-28 7:11:566 hrs 17 mins ago0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a8 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0 CRO0.144587207798 4,740.719623557
0x991e229cbe6aa44fb17ff8be08072b1d0d4f95bb18b05ae12ffa9a8508ddf80eWithdraw85226172023-05-27 17:21:4420 hrs 7 mins ago0xdf42607196b9c870e72c85a9477f623824d7cd55 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e10 CRO3.0525563991280
0x2d03fcbee2703cdaae803a4693173f07aa58cc967eaddf55c3931f11c1c00eddGet Reward85226132023-05-27 17:21:2120 hrs 7 mins ago0xdf42607196b9c870e72c85a9477f623824d7cd55 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e1 CRO1.6482986096820
0x1afa091804696a7789f04428602531fa9df43b5610bd1baa4be328396205657bGet Reward85136182023-05-27 3:12:171 day 10 hrs ago0x5f1565c6f992b50e9a530eae1e9f63835f8cb88f IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e1 CRO1.300260102330
0x09644e61c7c21d1d4ed97401e17369d3f3b988557ba47faa3e5186c9686e26fdWithdraw85136082023-05-27 3:11:211 day 10 hrs ago0x5f1565c6f992b50e9a530eae1e9f63835f8cb88f IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e3 CRO1.3028912270290
0x09b2619d7ecafbeb2328f8881ced4ae97d02a2285b0adb9b06fa94790cb11bc6Claim Charge Fee84804122023-05-24 22:54:593 days 14 hrs ago0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a8 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0 CRO0.14465913233 4,743.077882238
0x29d6bc5bbfe324203ba133330d523a2dcb05d7dde73fa2a836be43b105325f96Withdraw84783892023-05-24 19:43:573 days 17 hrs ago0x1fc7ba83e89bb974fe2d249dfa115a868dc864e5 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e9 CRO2.743245805588 4,743.670725007
0xeb2dddbaab6c8f817d163ecdfd2f936b29d89f5d0f32e693b7069c30adf8c484Withdraw84783822023-05-24 19:43:173 days 17 hrs ago0x1fc7ba83e89bb974fe2d249dfa115a868dc864e5 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e6 CRO1.854367423747 4,743.671047205
0x6fdbb799ca4750cf7513bedecec562e5d8012c3e90fbeb9013fe4f922056b3eeWithdraw84283372023-05-21 12:53:587 days 34 mins ago0xc05f6e693a727aca4c605dd413a6b751b2ca87c3 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e2 CRO0.9307048991140
0x6d8b0d951bd32de7fb82d7e6c1729d839fc1a2efa21bd1096048b10b6953b3daClaim Charge Fee84173482023-05-20 19:36:227 days 17 hrs ago0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a8 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0 CRO0.144747781407 4,745.984504663
0x1cb97135ba5639d3012e2b06d467a62c78f5d2eb7f0d48d2d0f4fd8dbf6726bcWithdraw84083532023-05-20 5:26:058 days 8 hrs ago0xc845823a061f2a91e6e1b4b977355d995f23bf16 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e2 CRO0.872907537304 4,746.900523707
0xeba5737c34bc00070ecc61f9d9ac51eb0abf367724a26842a8cbb3ea79335ccaWithdraw84083422023-05-20 5:25:038 days 8 hrs ago0xc845823a061f2a91e6e1b4b977355d995f23bf16 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e20 CRO5.586262321007 4,746.90103865
0xde957186e744e06c989e4c256f9090d47d13ad39d0fff653c947c927c300784aWithdraw84082702023-05-20 5:18:148 days 8 hrs ago0xc845823a061f2a91e6e1b4b977355d995f23bf16 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e20 CRO5.736743124395 4,746.904381957
0x87f0be765d048eedb9fc1502a835ccb7571c415d65771064060b5944623f9fedWithdraw83914612023-05-19 2:50:189 days 10 hrs ago0x19e3e29ec58b33b41d8394d338be2a20a6d28176 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e9 CRO2.2858224646510
0x6c334d0aa7d59cd715840ed256ca64ed3402591abd7f6ac576eeeddc690e92c3Withdraw83914572023-05-19 2:49:569 days 10 hrs ago0x19e3e29ec58b33b41d8394d338be2a20a6d28176 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e20 CRO4.9122168299460
0x85c2abf1bfab6cc1b76a01309bef5a1e9219534815a661f7e36b2508656be216Withdraw83914542023-05-19 2:49:399 days 10 hrs ago0x19e3e29ec58b33b41d8394d338be2a20a6d28176 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e10 CRO2.501864048720
0x11d1dbb07443b2ccf82f844060a3809d7670cb214d6d0c18dd0c14a891c8f516Withdraw83914492023-05-19 2:49:119 days 10 hrs ago0x19e3e29ec58b33b41d8394d338be2a20a6d28176 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e20 CRO5.7354709407130
0x99d7d53321852e5efd00b57a6250d7eed685625dba8ec3727d16c1ef51bc3c02Withdraw83914422023-05-19 2:48:319 days 10 hrs ago0x19e3e29ec58b33b41d8394d338be2a20a6d28176 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e20 CRO5.640210717340
0xe44c2631af34bf7d01ac24b2773e35a5732227ddf2c1c296b97e783efddda306Withdraw83843232023-05-18 15:35:419 days 21 hrs ago0x56820bc4dcc9ae3dc589267c7736efb45c2a2265 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e15 CRO4.2162341933420
0x64eb149e18c399bb4369ea44a91bcf23d37ba342c767f910c17ce41a0aeac4f7Claim Charge Fee83762922023-05-18 2:57:2710 days 10 hrs ago0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a8 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0 CRO0.144805537557 4,747.878211011
0x27f5cb61f85bddc629875938d8276698589cd1422d0cb098ee486177af013455Withdraw83717962023-05-17 19:53:0410 days 17 hrs ago0xf7f260c186dbcd6df689e21e04cb67fb610e68e6 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e8 CRO2.5254400247470
0xb8eca17a12f89b7ca8d1511767ff4ea46517afca8947f616460e3f5c95b61edaGet Reward83717922023-05-17 19:52:4210 days 17 hrs ago0xf7f260c186dbcd6df689e21e04cb67fb610e68e6 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e1 CRO1.3656368664750
0x8c99bd219376acd4e0c4beb89da9fdec5b1c472b491918c279c212d335ddf82fWithdraw83696862023-05-17 16:33:3910 days 20 hrs ago0x90f07a58aeda1dcecb12badcb9ad130666e72172 IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e3 CRO1.197068568740
0x64478e7b044464cd44af259c86fbdf2a9c4c42c6d54a3f2b742d73e2941a64a4Withdraw83649922023-05-17 9:10:1511 days 4 hrs ago0x3381c691c0cddca9e71330cca711eab547adb9ea IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e15 CRO3.8057663378830
0xc03c76674dc4d82519c3e2c0f93de5930425ea7c370f1a81d66fb453bff86ab2Withdraw83649842023-05-17 9:09:3011 days 4 hrs ago0x3381c691c0cddca9e71330cca711eab547adb9ea IN  0x10892c8b6271ba27dd10aad80ad71b8ee671be9e8 CRO2.2755612602730
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Latest 19 internal transactions
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0xae5e8206c6fefbf7f6d54f92e915711129c2a7272a899914e2198948a2d27f9085314172023-05-28 7:11:566 hrs 17 mins ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a815 CRO
0x09b2619d7ecafbeb2328f8881ced4ae97d02a2285b0adb9b06fa94790cb11bc684804122023-05-24 22:54:593 days 14 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a817 CRO
0x6d8b0d951bd32de7fb82d7e6c1729d839fc1a2efa21bd1096048b10b6953b3da84173482023-05-20 19:36:227 days 17 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a8136 CRO
0x64eb149e18c399bb4369ea44a91bcf23d37ba342c767f910c17ce41a0aeac4f783762922023-05-18 2:57:2710 days 10 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a881 CRO
0xdf1e90da6d1ba201305f28e0cdd313e7eb5cdfe7750eab73cc8977575556207482180872023-05-07 18:13:1720 days 19 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a818 CRO
0x223529bc4b7de7f821792785d1a39e5314df0cacd417ef20f4186b9cb86eb44f81324442023-05-02 3:39:4326 days 9 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a840 CRO
0x4dc24c3b12f1b97693201e9c1fa6d9b57f4e403a4e3eea287c702110a314e79780694802023-04-28 0:48:2730 days 12 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a813 CRO
0xc38369af5b57dc4362bc331eb511b2be4338a055c8693833e242f0532217a89978133292023-04-11 6:36:0347 days 6 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a841 CRO
0x1c3ac612fdef1f2a1c14d61b426dee1550237412411249bad75c5903666b6f8777681782023-04-08 7:45:3650 days 5 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a853 CRO
0xc55ab90ede476809fd422f902b2cd56b5d0f5bdea7d9f6af46533cc58a2f6a7c76000942023-03-28 7:59:0561 days 5 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a852 CRO
0x3582f5050649b6cc91989d2a490659004151457e2cffb01b3e174426faed2ca175078842023-03-22 7:22:5867 days 6 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a821 CRO
0x04b66363f9b41c4ec101ba356236c13bca34e32f3a97ac1dbab4d5889633df2674163182023-03-16 7:37:3473 days 5 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a852 CRO
0x4b7a46bf39c337a7e6b0433c806097aa366f4395f5230425465111252bbb83ce73556622023-03-12 8:18:1977 days 5 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a812 CRO
0x8f25a32f37b9865d2153c8403da67988c3e604657e028abd9d30d7410ac1f64e72411992023-03-04 20:38:2484 days 16 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a84 CRO
0x080e0d12905c25fbd9c783ce1c03f19b0416c645068bee1da41db60c01b2350471554812023-02-27 6:16:0390 days 7 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a821 CRO
0xf3ff41fc2e5b93836b4c074c1307aff2442f0076850a9aec71b6d4622af6579070274382023-02-18 21:23:0698 days 16 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a828 CRO
0x7097ad6916bd29638d03d4409f9cc851d48242269e987f18b323819bf292fc3968444992023-02-06 22:13:32110 days 15 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a894 CRO
0x9ef5e8478a561ce4e6f148ab366336d42667fd6537d63271b3c34e144e17b09166486552023-01-25 2:13:14123 days 11 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a891 CRO
0x56a1619da30c0a1201f7805c009ae9e7a93e314e891b11f02129f8b4f895711165400632023-01-17 23:05:24130 days 14 hrs ago 0x10892c8b6271ba27dd10aad80ad71b8ee671be9e0x8fc0fd5ad6a540a8db86e8b22e4b7355005d57a8632 CRO
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0xb467784A0d48c2e4AA133502BDcD5EaF2D587546

Contract Name:
StakeV2

Compiler Version
v0.8.17+commit.8df45f5f

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at cronoscan.com on 2022-11-27
*/

// Sources flattened with hardhat v2.11.2 https://hardhat.org

// File @openzeppelin/contracts/utils/[email protected]

//  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 @openzeppelin/contracts/access/[email protected]

// 
// 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/security/[email protected]

// 
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}


// File @openzeppelin/contracts/security/[email protected]

// 
// OpenZeppelin Contracts v4.4.1 (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() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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


// File @openzeppelin/contracts/utils/math/[email protected]

// 
// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}


// File @openzeppelin/contracts/utils/introspection/[email protected]

// 
// 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);
}


// File @openzeppelin/contracts/token/ERC721/[email protected]

// 
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

/**
 * @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: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * 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 @openzeppelin/contracts/token/ERC721/[email protected]

// 
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}


// File @openzeppelin/contracts/token/ERC20/[email protected]

// 
// 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 @openzeppelin/contracts/utils/[email protected]

// 
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is 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.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @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].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


// File @openzeppelin/contracts/token/ERC20/extensions/[email protected]

// 
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}


// File @openzeppelin/contracts/token/ERC20/utils/[email protected]

// 
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;



/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    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));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    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'
        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));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}


// File contracts/v2/StakeV2.sol

pragma solidity ^0.8.4;







contract StakeV2 is ReentrancyGuard, Pausable, Ownable, IERC721Receiver {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    /* ========== STATE VARIABLES ========== */

    IERC20 immutable public rewardsToken;
    address[] public collectionAddresses;
    mapping(address => uint256) public collectionRatio;
    mapping(address => bool) public isAllowedCollection;
    mapping(address => uint256) public totalStaked;

    mapping(address => mapping(address => uint256)) public collectionToUserToBalances;
    mapping(address => uint256) public rewardPerTokenStored;
    mapping(address => uint256) public lastUpdateTime;

    uint256 public periodFinish = 0;
    uint256 public rewardsDuration = 7 days;
    uint256 public rewardRate = 0;

    mapping(address => mapping(address => uint256)) public collectionToUserToRewardPerTokenPaid;
    mapping(address => uint256) public rewards;
    mapping(address => mapping(address => uint256)) public collectionToUserToRewards;

    // fee
    uint256 public chargeStake = 1 ether;
    uint256 public chargeWithdraw = 1 ether;
    uint256 public chargeClaim = 2 ether;
    address public chargePayee;

    /* ========== CONSTRUCTOR ========== */

    constructor(
        address _rewardsToken,
        address[] memory _collections,
        uint256[] memory _ratios
    ) public Ownable() {
        rewardsToken = IERC20(_rewardsToken);
        collectionAddresses = _collections;
        chargePayee = msg.sender;
        for (uint256 i = 0; i < _collections.length; i++) {
            collectionRatio[_collections[i]] = _ratios[i];
            isAllowedCollection[_collections[i]] = true;
        }
    }

    /* ========== VIEWS ========== */

    function balanceOf(address collection, address account) external view returns (uint256) {
        return collectionToUserToBalances[collection][account];
    }

    function lastTimeRewardApplicable() public view returns (uint256) {
        return block.timestamp < periodFinish ? block.timestamp : periodFinish;
    }

    function rewardPerToken(address collection) public view returns (uint256) {
        if (totalStaked[collection] == 0) {
            return rewardPerTokenStored[collection];
        }
        return
            rewardPerTokenStored[collection]
            .add(
                lastTimeRewardApplicable()
                .sub(lastUpdateTime[collection])
                .mul(rewardRate)
                .mul(1e18)
                .mul(collectionRatio[collection])
                .div(100)
                .div(totalStaked[collection])
            );
    }

    function earned(address collection, address account) public view returns (uint256) {
        return collectionToUserToBalances[collection][account]
        .mul(rewardPerToken(collection).sub(collectionToUserToRewardPerTokenPaid[collection][account]))
        .div(1e18)
        .add(rewards[account]);
    }

    function getRewardForDuration() external view returns (uint256) {
        return rewardRate.mul(rewardsDuration);
    }

    /* ========== FEE FUNCTIONS ========== */
    function setChargeFee(uint256 _stake, uint256 _withdraw, uint256 _claim) onlyOwner() public {
        chargeStake = _stake;
        chargeWithdraw = _withdraw;
        chargeClaim = _claim;
    }

    function setChargePayee(address _payee) onlyOwner() public {
        chargePayee = _payee;
    }

    function claimChargeFee() public {
        require(chargePayee != address(0), "chargePayee is not set");
        require(msg.sender == chargePayee, "only chargePayee can claim fee");
        payable(msg.sender).transfer(address(this).balance);
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    function stake(address collection, uint256[] memory ids) external payable nonReentrant whenNotPaused updateReward(collection, msg.sender) {
        require(msg.value == chargeStake * ids.length, "stake fee is not enough");
        require(ids.length > 0, "Cannot stake 0 nft");
        require(isAllowedCollection[collection], "Collection is not allowed");

        totalStaked[collection] = totalStaked[collection].add(ids.length);
        collectionToUserToBalances[collection][msg.sender] = collectionToUserToBalances[collection][msg.sender].add(ids.length);
        for (uint256 i = 0; i < ids.length; i++) {
            IERC721(collection).safeTransferFrom(msg.sender, address(this), ids[i]);
        }
        emit Staked(msg.sender, collection, ids.length);
    }

    function withdraw(address collection, uint256[] memory ids) public payable nonReentrant updateReward(collection, msg.sender) {
        require(msg.value == chargeWithdraw * ids.length, "withdraw fee is not enough");
        require(ids.length > 0, "Cannot withdraw 0 nft");

        totalStaked[collection] = totalStaked[collection].sub(ids.length);
        collectionToUserToBalances[collection][msg.sender] = collectionToUserToBalances[collection][msg.sender].sub(ids.length);
        for (uint256 i = 0; i < ids.length; i++) {
            IERC721(collection).safeTransferFrom(address(this), msg.sender, ids[i]);
        }
        emit Withdrawn(msg.sender, collection, ids.length);
    }

    function getReward() public payable nonReentrant {
        require(msg.value == chargeClaim, "claim fee is not enough");
        for (uint256 i = 0; i < collectionAddresses.length; i++) {
            _updateReward(collectionAddresses[i], msg.sender);
        }
        uint256 reward = rewards[msg.sender];
        if (reward > 0) {
            rewards[msg.sender] = 0;
            rewardsToken.safeTransfer(msg.sender, reward);
            emit RewardPaid(msg.sender, reward);
        }
    }

    /* ========== RESTRICTED FUNCTIONS ========== */

    function notifyRewardAmount(uint256 reward) external onlyOwner {
        for (uint256 i = 0; i < collectionAddresses.length; i++) {
            _updateReward(collectionAddresses[i], address(0));
        }
        if (block.timestamp >= periodFinish) {
            rewardRate = reward.div(rewardsDuration);
        } else {
            uint256 remaining = periodFinish.sub(block.timestamp);
            uint256 leftover = remaining.mul(rewardRate);
            rewardRate = reward.add(leftover).div(rewardsDuration);
        }

        uint balance = rewardsToken.balanceOf(address(this));
        require(rewardRate <= balance.div(rewardsDuration), "Provided reward too high");

        for (uint256 i = 0; i < collectionAddresses.length; i++) {
            lastUpdateTime[collectionAddresses[i]] = block.timestamp;
        }
        periodFinish = block.timestamp.add(rewardsDuration);
        emit RewardAdded(reward);
    }

    // Added to support recovering LP Rewards from other systems such as BAL to be distributed to holders
    function recoverERC20(address tokenAddress, uint256 tokenAmount) external onlyOwner {
        IERC20(tokenAddress).safeTransfer(owner(), tokenAmount);
        emit Recovered(tokenAddress, tokenAmount);
    }

    function setRewardsDuration(uint256 _rewardsDuration) external onlyOwner {
        require(
            block.timestamp > periodFinish,
            "Previous rewards period must be complete before changing the duration for the new period"
        );
        rewardsDuration = _rewardsDuration;
        emit RewardsDurationUpdated(rewardsDuration);
    }

    function pause() external onlyOwner {
        _pause();
    }

    function unpause() external onlyOwner {
        _unpause();
    }

    /* ========== MODIFIERS ========== */

    modifier updateReward(address collection, address account) {
        _updateReward(collection, account);
        _;
    }

    function _updateReward(address collection, address account) internal {
        rewardPerTokenStored[collection] = rewardPerToken(collection);
        lastUpdateTime[collection] = lastTimeRewardApplicable();
        if (account != address(0)) {
            rewards[account] = earned(collection, account);
            collectionToUserToRewardPerTokenPaid[collection][account] = rewardPerTokenStored[collection];
        }
    }

    function onERC721Received(address operator, address from, uint256 tokenId, bytes memory data) external pure returns (bytes4) {
        return IERC721Receiver.onERC721Received.selector;
    }

    /* ========== EVENTS ========== */

    event RewardAdded(uint256 reward);
    event Staked(address indexed user, address indexed collection, uint256 amount);
    event Withdrawn(address indexed user, address indexed collection, uint256 amount);
    event RewardPaid(address indexed user, uint256 reward);
    event RewardsDurationUpdated(uint256 newDuration);
    event Recovered(address token, uint256 amount);
}

Contract ABI

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Swarm Source

ipfs://5b8748a7cca4cfaef61c0180bb72d0e1a9b7d32524eb5b7912a98b71035b25a7
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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