Contract 0x8B81e64b6d4ebE2EC0f155df28c54aE2F20189DD 1

 
 
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0xd1d9bb433fb48f99341a0427c45884b70a0762cfa716709f5fbbb7c3005b172eRedeem149164692022-06-06 18:44:05186 days 10 hrs agoENS Name sapph1re.eth IN  0x8b81e64b6d4ebe2ec0f155df28c54ae2f20189dd0 Ether0.00579036 32
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0x33b7f4c690d00e9b1b0d63dc6bea8b651c674830e514046e8dc6dbac64012526Transfer From148094852022-05-20 6:11:57203 days 22 hrs ago0xdca5dbd07b8f3e1b58c8ac9617e7f54a1ce22d06 IN  0x8b81e64b6d4ebe2ec0f155df28c54ae2f20189dd0 Ether0.00118286 12.86370745
0xb2fea3c6beb6aa11d606d145bb37e38d31d30f4ead0a67b59380088987c36485Check In146377202022-04-22 23:49:43231 days 5 hrs ago0x45e7b9d8d50555dad0e70fee9c01617eb5cdd442 IN  0x8b81e64b6d4ebe2ec0f155df28c54ae2f20189dd0 Ether0.00495685 52.38700291
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0xd475aed3c0f3d5562a2e7935392669056f17fc77b39ad6bc4b3142eb70d77715Set Approval For...145946552022-04-16 6:11:27237 days 22 hrs ago0x0cbd39f71c68dfe81a89d39c24100f44374282d7 IN  0x8b81e64b6d4ebe2ec0f155df28c54ae2f20189dd0 Ether0.00087521 18.92965786
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0x859b535764bd0f9f19da4331b9f84190d78a4eeaa1a74c47b630481b0e645089Set Approval For...145571522022-04-10 9:26:47243 days 19 hrs agoENS Name tomyu.eth IN  0x8b81e64b6d4ebe2ec0f155df28c54ae2f20189dd0 Ether0.00078817 17.04716006
0x5533527717109b3714cd7190f79ead0e1b62908b133f8049c731a74ee40264e6Set Approval For...145571282022-04-10 9:21:59243 days 19 hrs ago0x0cbd39f71c68dfe81a89d39c24100f44374282d7 IN  0x8b81e64b6d4ebe2ec0f155df28c54ae2f20189dd0 Ether0.00087167 18.85311892
0x31296234643d53a47978deef6d9393e82c900096b9becba01f3d4e4e9d46c0e1Check In144504492022-03-24 17:56:52260 days 10 hrs agoENS Name sapph1re.eth IN  0x8b81e64b6d4ebe2ec0f155df28c54ae2f20189dd0 Ether0.00352061 58.26908746
0x3bde99b5643bdd52d4578919c1555369407432ef3d8a60af6097bd43e1c72974Set Approval For...143311642022-03-06 4:21:36279 days 31 mins ago0xcbfb423d668f848866427089e8527474dbbe4a58 IN  0x8b81e64b6d4ebe2ec0f155df28c54ae2f20189dd0 Ether0.00108597 23.48806821
0xe04d2ad2a57d00fd4609dbd38b47767d4373ad63077bd51d4ff5e76c58a5c9d9Check In143062752022-03-02 7:41:55282 days 21 hrs ago0x28cc5f8ce155985e6b937e7d60bf4ebef6fff7a9 IN  0x8b81e64b6d4ebe2ec0f155df28c54ae2f20189dd0 Ether0.0028968 47.94439326
0xfba3189bfa6a8f7bfcedf628050f7a6c8de647d3bea22c7c5e8c4d501b44dfeeCheck In143053362022-03-02 4:03:36283 days 49 mins ago0x28cc5f8ce155985e6b937e7d60bf4ebef6fff7a9 IN  0x8b81e64b6d4ebe2ec0f155df28c54ae2f20189dd0 Ether0.00238847 39.53126903
0x478c8bceac25fde9c73d0fa3537dbf34b694fdf2d77e1a443f0b4203d97b44eeSet Approval For...143053262022-03-02 4:01:18283 days 52 mins ago0x28cc5f8ce155985e6b937e7d60bf4ebef6fff7a9 IN  0x8b81e64b6d4ebe2ec0f155df28c54ae2f20189dd0 Ether0.00174617 37.76744341
0xe752145ab5de3b958bc8769613d06754a75f76ca55f0f73d6f2d2c77ebf0deb2Check In142942412022-02-28 11:00:56284 days 17 hrs ago0xdca5dbd07b8f3e1b58c8ac9617e7f54a1ce22d06 IN  0x8b81e64b6d4ebe2ec0f155df28c54ae2f20189dd0 Ether0.00226941 23.98449707
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Contract Source Code Verified (Exact Match)

Contract Name:
DclDoNFT

Compiler Version
v0.8.10+commit.fc410830

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2022-01-21
*/

// File: @openzeppelin/contracts/utils/structs/EnumerableSet.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastvalue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastvalue;
                // Update the index for the moved value
                set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        return _values(set._inner);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        assembly {
            result := store
        }

        return result;
    }
}

// File: @openzeppelin/contracts/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 `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// File: contracts/OwnableContract.sol


pragma solidity 0.8.10;

contract OwnableContract {
    address public owner;
    address public pendingOwner;
    address public admin;

    event NewAdmin(address oldAdmin, address newAdmin);
    event NewOwner(address oldOwner, address newOwner);
    event NewPendingOwner(address oldPendingOwner, address newPendingOwner);

    function initOwnableContract() internal{
        owner = msg.sender;
        admin = msg.sender;
    }

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

    modifier onlyPendingOwner {
        require(msg.sender == pendingOwner,"onlyPendingOwner");
        _;
    }

    modifier onlyAdmin {
        require(msg.sender == admin || msg.sender == owner,"onlyAdmin");
        _;
    } 

    
    function transferOwnership(address _pendingOwner) public onlyOwner {
        emit NewPendingOwner(pendingOwner, _pendingOwner);
        pendingOwner = _pendingOwner;
    }

    function renounceOwnership() public virtual onlyOwner {
        emit NewOwner(owner, address(0));
        emit NewAdmin(admin, address(0));
        emit NewPendingOwner(pendingOwner, address(0));

        owner = address(0);
        pendingOwner = address(0);
        admin = address(0);
    }
    
    function acceptOwner() public onlyPendingOwner {
        emit NewOwner(owner, pendingOwner);
        owner = pendingOwner;

        address newPendingOwner = address(0);
        emit NewPendingOwner(pendingOwner, newPendingOwner);
        pendingOwner = newPendingOwner;
    }    
    
    function setAdmin(address newAdmin) public onlyOwner {
        emit NewAdmin(admin, newAdmin);
        admin = newAdmin;
    }




}

// File: contracts/IWrapDoNFT.sol


pragma solidity 0.8.10;




interface IWrapDoNFT {

    event Redeem(uint256 oid,uint256 tokenId);

    function couldRedeem(uint256 tokenId,uint256[] calldata durationIds) external view returns(bool);

    function redeem(uint256 tokenId,uint256[] calldata durationIds) external;

}

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

    /**
     * @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 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);

    /**
     * @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;
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol



pragma solidity ^0.8.0;


/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

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



pragma solidity ^0.8.0;

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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



pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol



pragma solidity ^0.8.0;


/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// File: @openzeppelin/contracts/token/ERC721/ERC721.sol



pragma solidity ^0.8.0;








/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @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.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol



pragma solidity ^0.8.0;


/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// File: @openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol



pragma solidity ^0.8.0;



/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

// File: @openzeppelin/contracts/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 make 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: contracts/IBaseDoNFT.sol


pragma solidity 0.8.10;



interface IBaseDoNFT is IERC721Receiver {
    struct Duration{
        uint64 start; 
        uint64 end;
    }

    struct DoNftInfo {
        uint256 oid;
        uint64 nonce;
        EnumerableSet.UintSet durationList;
    }

    event MetadataUpdate(uint256 tokenId);

    event DurationUpdate(uint256 durationId,uint256 tokenId,uint64 start,uint64 end);

    event DurationBurn(uint256[] durationIdList);

    event CheckIn(address opreator,address to,uint256 tokenId,uint256 durationId);

    function init(address address_,string memory name_, string memory symbol_) external;

    function isWrap() external pure returns(bool);

    function mintXNft(uint256 oid) external returns(uint256 tid);

    function mint(uint256 tokenId,uint256 durationId,uint64 start,uint64 end,address to) external returns(uint256 tid);

    function setMaxDuration(uint64 v) external;

    function getDurationIdList(uint256 tokenId) external view returns(uint256[] memory);

    function getDurationListLength(uint256 tokenId) external view returns(uint256);

    function getDoNftInfo(uint256 tokenId) external view returns(uint256 oid, uint256[] memory durationIds,uint64[] memory starts,uint64[] memory ends,uint64 nonce);

    function getNonce(uint256 tokenId) external view returns(uint64);

    function getDuration(uint256 durationId) external view returns(uint64 start, uint64 end);

    function getDurationByIndex(uint256 tokenId,uint256 index) external view returns(uint256 durationId,uint64 start, uint64 end);

    function getXNftId(uint256 originalNftId) external view returns(uint256);

    function isXNft(uint256 tokenId) external view returns(bool);

    function isValidNow(uint256 tokenId) external view returns(bool isValid);

    function getOriginalNftAddress() external view returns(address);

    function getOriginalNftId(uint256 tokenId) external view returns(uint256);

    function checkIn(address to,uint256 tokenId,uint256 durationId) external;

    function getUser(uint256 orignalNftId) external returns(address);

    function exists(uint256 tokenId) external view returns (bool);

    
}

// File: contracts/BaseDoNFT.sol


pragma solidity 0.8.10;





abstract contract BaseDoNFT is OwnableContract,ReentrancyGuard,ERC721Enumerable,IBaseDoNFT {
    using EnumerableSet for EnumerableSet.UintSet;
    address internal oNftAddress;
    uint256 public curDoid;
    uint256 public curDurationId;
    uint64 private maxDuration = 31536000;
    mapping(uint256 => DoNftInfo) internal doNftMapping;
    mapping(uint256 => Duration) internal durationMapping;
    mapping(uint256 => uint256) internal oid2xid;
    mapping(uint256 => address) internal checkInUserMapping;

    bool private isOnlyNow = true;
    string private _doName;
    string private _doSymbol;
    string private _dclURI;
    
    constructor()ERC721("DoNFT","DoNFT"){
        initOwnableContract();
    }

    modifier onlyNow(uint64 start) {
        if(isOnlyNow){
            require(start <= block.timestamp, "must from now");
        }
        _;
    }

    function onlyApprovedOrOwner(address spender,address nftAddress,uint256 tokenId) internal view returns(bool){
        address owner = ERC721(nftAddress).ownerOf(tokenId);
        require(owner != address(0),"ERC721: operator query for nonexistent token");
        return (spender == owner || ERC721(nftAddress).getApproved(tokenId) == spender || ERC721(nftAddress).isApprovedForAll(owner, spender));
    }

    function init(address address_,string memory name_, string memory symbol_) public {
        require(oNftAddress==address(0),"already inited");
        oNftAddress = address_;
        _doName = name_;
        _doSymbol = symbol_;
    }
    function name() public view virtual override returns (string memory) {
        return _doName;
    }
    function symbol() public view virtual override returns (string memory) {
        return _doSymbol;
    }

    function setIsOnlyNow(bool v) public onlyAdmin {
        isOnlyNow = v;
    }

    function contains(uint256 tokenId,uint256 durationId) public view returns(bool){
        return doNftMapping[tokenId].durationList.contains(durationId);
    }

    function getDurationIdList(uint256 tokenId) external view returns(uint256[] memory){
        DoNftInfo storage info = doNftMapping[tokenId];
        return info.durationList.values();
    }
    function getDuration(uint256 durationId) public view returns(uint64, uint64){
        Duration storage duration = durationMapping[durationId];
        return (duration.start,duration.end);
    }

    function getDurationByIndex(uint256 tokenId,uint256 index) public view returns(uint256 durationId,uint64 start, uint64 end){
        DoNftInfo storage info = doNftMapping[tokenId];
        require(index < info.durationList.length(),"out of range");
        durationId = info.durationList.at(index);
        (start,end) = getDuration(durationId);
        return(durationId,start,end);
    }

    function isValidNow(uint256 tokenId) public view returns(bool isValid){
        DoNftInfo storage info = doNftMapping[tokenId];
        uint256 length = info.durationList.length();
        uint256 durationId;
        for (uint256 index = 0; index < length; index++) {
            durationId = info.durationList.at(index);
            if(durationMapping[durationId].start <= block.timestamp && block.timestamp <= durationMapping[durationId].end){
                return true;
            }
        }
        return false;
    }

    function getDurationListLength(uint256 tokenId) external view returns(uint256){
        return doNftMapping[tokenId].durationList.length();
    }

    function getDoNftInfo(uint256 tokenId) public view returns(uint256 oid, uint256[] memory durationIds, uint64[] memory starts,uint64[] memory ends,uint64 nonce){
        DoNftInfo storage info = doNftMapping[tokenId];
        oid = info.oid;
        nonce = info.nonce;
        uint256 length = info.durationList.length();
        uint256 durationId;
        starts = new uint64[](length);
        ends = new uint64[](length);
        durationIds = info.durationList.values();
        for (uint256 index = 0; index < length; index++) {
            durationId = info.durationList.at(index);
            starts[index] = durationMapping[durationId].start;
            ends[index] = durationMapping[durationId].end;
        }
        
    }

    function getNonce(uint256 tokenId) external view returns(uint64){
       return doNftMapping[tokenId].nonce;
    }

    function mint(
        uint256 tokenId,
        uint256 durationId,
        uint64 start,
        uint64 end,
        address to
    ) public onlyNow(start) nonReentrant returns(uint256 tid){
        if(start < block.timestamp){
            start = uint64(block.timestamp);
        }
        require(_isApprovedOrOwner(_msgSender(), tokenId) || _isApprovedOrOwner(tx.origin, tokenId), "not owner nor approved");
        require(end > start && end <= block.timestamp + maxDuration, "invalid start or end");
        DoNftInfo storage info = doNftMapping[tokenId];
        require(contains(tokenId,durationId), "not contains durationId");
        Duration storage duration = durationMapping[durationId];
        require(start >= duration.start && end <= duration.end, "invalid duration");
        uint256 tDurationId;
        if (start == duration.start && end == duration.end) {
            tid = mintDoNft(to,info.oid,start,end);
            tDurationId = curDurationId;
            _burnDuration(tokenId, durationId);
            if(info.durationList.length() == 0){
                _burn(tokenId);
            }
        } else {
            if(start == duration.start && end != duration.end){
                duration.start = end + 1;
            }else if(start != duration.start && end == duration.end){
                duration.end = start - 1;
            }else{
                if (start > block.timestamp) {
                    newDuration(tokenId, duration.start, start-1);
                }
                duration.start = end + 1;
            }

            tid = mintDoNft(to, info.oid,start,end);
            tDurationId = curDurationId;
        }
        
        if(start==block.timestamp){
            checkIn(to, tid, tDurationId);
        }
        emit MetadataUpdate(tokenId);
        
    }
    
    function setMaxDuration(uint64 v) public onlyAdmin{
        maxDuration = v;
    }
    function newDoNft(uint256 oid_,uint64 start,uint64 end) internal returns (uint256)
    {
        curDoid++;
        DoNftInfo storage info = doNftMapping[curDoid];
        info.oid = oid_;
        info.nonce = 0;
        newDuration(curDoid,start,end);
        return curDoid;
    }
    
    function newDuration(uint256 tokenId,uint64 start,uint64 end) private{
        curDurationId++;
        durationMapping[curDurationId] = Duration(start,end);
        doNftMapping[tokenId].durationList.add(curDurationId);
        emit DurationUpdate(curDurationId,tokenId,start,end);
    }

    function mintDoNft(address to, uint256 oid_,uint64 start,uint64 end)
        internal
        returns (uint256)
    {
        newDoNft(oid_,start,end);
        _safeMint(to, curDoid);
        return curDoid;
    }

    function concat(uint256 tokenId,uint256 durationId,uint256 targetTokenId,uint256 targetDurationId) public {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        require(contains(tokenId,durationId),"not contains");
        require(ownerOf(tokenId) == ownerOf(targetTokenId), "diff owner");
        require(doNftMapping[tokenId].oid == doNftMapping[targetTokenId].oid , "diff oid");
        require(contains(targetTokenId,targetDurationId),"not contains");
        
        Duration storage duration = durationMapping[durationId];
        Duration storage targetDuration = durationMapping[targetDurationId];
        if(duration.end < targetDuration.start){
            require(duration.end+1==targetDuration.start);
            targetDuration.start = duration.start;
            _burnDuration(tokenId,durationId);
        }
        else if(targetDuration.end < duration.start){
            require(targetDuration.end+1 == duration.start);
            targetDuration.end = duration.end;
            _burnDuration(tokenId,durationId);
        }

        if(doNftMapping[tokenId].durationList.length() == 0){
            _burn(tokenId);
        }

    }

    function _burnDuration(uint256 tokenId,uint256 durationId) private{
        delete durationMapping[durationId];
        doNftMapping[tokenId].durationList.remove(durationId);
        uint256[] memory arr = new uint256[](1);
        arr[0] = durationId;
        emit DurationBurn(arr);
    }
   
    function _burnXNft(uint256 wid) internal {
        DoNftInfo storage info = doNftMapping[wid];
        uint256 length = info.durationList.length();
        for (uint256 index = 0; index < length; index++) {
            delete durationMapping[info.durationList.at(index)];
        }
        emit DurationBurn(info.durationList.values());
        delete info.durationList;
        delete oid2xid[info.oid];
        _burn(wid);
    }

    function _burn(uint256 tokenId) internal override virtual {
        ERC721._burn(tokenId);
        delete doNftMapping[tokenId];
    }

    function checkIn(address to,uint256 tokenId,uint256 durationId) public virtual{
        require(_isApprovedOrOwner(_msgSender(), tokenId) || _isApprovedOrOwner(tx.origin, tokenId), "not owner nor approved");
        DoNftInfo storage info = doNftMapping[tokenId];
        Duration storage duration = durationMapping[durationId];
        require(duration.end >= block.timestamp,"invalid end");
        require(duration.start <= block.timestamp,"invalid start");
        require(info.durationList.contains(durationId),"not contains");
        checkInUserMapping[info.oid] = to;
        emit CheckIn(tx.origin,to,tokenId,durationId);
    }

    function getUser(uint256 originalNftId) public view returns(address){
        return checkInUserMapping[originalNftId];
    }

    function gc(uint256 tokenId,uint256[] calldata durationIds) public {
        DoNftInfo storage info = doNftMapping[tokenId];
        uint256 durationId;
        Duration storage duration;
        for (uint256 index = 0; index < durationIds.length; index++) {
            durationId = durationIds[index];
            if(contains(tokenId, durationId)){
                duration = durationMapping[durationId];
                if(duration.end <= block.timestamp){
                    _burnDuration(tokenId,durationId);
                }
            }
        }
        
        if(info.durationList.length() == 0){
            require(!isXNft(tokenId),"can not burn xNFT");
            _burn(tokenId);
        }
    }

    function getFingerprint(uint256 tokenId) public view returns(bytes32 print){
        (uint256 oid, uint256[] memory durationIds,uint64[] memory starts,uint64[] memory ends,uint64 nonce) = getDoNftInfo(tokenId);
        print = keccak256(abi.encodePacked(oid,durationIds,starts,ends,nonce));
    }

    function isXNft(uint256 tokenId) public view returns(bool) {
        if(tokenId == 0) return false;
        
        return oid2xid[doNftMapping[tokenId].oid] == tokenId ;
    }

    function isWrap() public pure virtual returns(bool){
        return false;
    }

    function getOriginalNftAddress() external view returns(address){
        return oNftAddress;
    }
    function getOriginalNftId(uint256 tokenId) external view returns(uint256){
        DoNftInfo storage info = doNftMapping[tokenId];
        return info.oid;
    }

    function getXNftId(uint256 originalNftId) public view returns(uint256) {
        return oid2xid[originalNftId] ;
    }

    function onERC721Received(address operator,address from,uint256 tokenId,bytes calldata data
    ) external override virtual pure returns (bytes4) {
        bytes4 received = 0x150b7a02;
        return received;
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override{
        ERC721Enumerable._beforeTokenTransfer(from, to, tokenId);
        doNftMapping[tokenId].nonce++;
    }

    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return
            interfaceId == type(IBaseDoNFT).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    function setBaseURI(string memory newBaseURI) public onlyAdmin {
        _dclURI = newBaseURI;
    }

    function tokenURI(uint256 tokenId) public view virtual override returns (string memory){
        return string(abi.encodePacked(_dclURI, Strings.toString(tokenId)));
    }

    function exists(uint256 tokenId) public view virtual returns (bool) {
        return _exists(tokenId);
    }

    
}

// File: contracts/WrapDoNFT.sol


pragma solidity 0.8.10;




contract WrapDoNFT is BaseDoNFT,IWrapDoNFT{
    using EnumerableSet for EnumerableSet.UintSet;

    function mintXNft(uint256 oid) public nonReentrant override returns(uint256 tid){
        require(oid2xid[oid] == 0, "already warped");
        require(onlyApprovedOrOwner(tx.origin,oNftAddress,oid) || onlyApprovedOrOwner(msg.sender,oNftAddress,oid),"only approved or owner");
        address lastOwner = ERC721(oNftAddress).ownerOf(oid);
        ERC721(oNftAddress).safeTransferFrom(lastOwner, address(this), oid);
        tid = mintDoNft(lastOwner,oid,uint64(block.timestamp),type(uint64).max);
        oid2xid[oid] = tid;
    }

    function isWNft(uint256 tokenId)public view returns (bool){
        return isXNft(tokenId);
    }

    function getWNftId(uint256 oid) public view returns(uint256){
        return getXNftId(oid);
    }

    function mintWNft(uint256 oid) public returns(uint256 tid){
        tid = mintXNft(oid);
    }
    
    function couldRedeem(uint256 tokenId,uint256[] calldata durationIds) public view returns(bool) {
        require(isXNft(tokenId) , "not xNFT") ;
        DoNftInfo storage info = doNftMapping[tokenId];
        Duration storage duration = durationMapping[durationIds[0]];
        if(duration.start > block.timestamp){
            return false;
        }
        uint64 lastEndTime = duration.end;
        for (uint256 index = 1; index < durationIds.length; index++) {
            require(info.durationList.contains(durationIds[index]),"out of bundle");
            duration = durationMapping[durationIds[index]];
            if(lastEndTime+1 == duration.start){
                lastEndTime = duration.end;
            }
        }
        return lastEndTime == type(uint64).max;
        
        
    }
    
    function redeem(uint256 tokenId,uint256[] calldata durationIds) public{
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        require(couldRedeem(tokenId, durationIds),"cannot redeem");
        DoNftInfo storage info = doNftMapping[tokenId];
        ERC721(oNftAddress).safeTransferFrom(address(this), ownerOf(tokenId), info.oid);
        _burnXNft(tokenId);
        emit Redeem(info.oid,tokenId);
    }

    function isWrap() public pure override returns(bool){
        return true;
    }


}

// File: contracts/dcl/IDCL.sol


pragma solidity 0.8.10;

interface IDCL{
    function setUpdateOperator(uint256 assetId,address operator) external;
}

// File: contracts/dcl/DclDoNFT.sol


pragma solidity 0.8.10;




contract DclDoNFT is WrapDoNFT{
    using EnumerableSet for EnumerableSet.UintSet;
    constructor(address address_,string memory name_, string memory symbol_) {
        super.init(address_, name_, symbol_);
    }
    
    function checkIn(address to,uint256 tokenId,uint256 durationId) public override virtual{
        BaseDoNFT.checkIn(to,tokenId,durationId);
        DoNftInfo storage info = doNftMapping[tokenId];
        IDCL(oNftAddress).setUpdateOperator(info.oid, to);
    }

    

}

Contract Security Audit

Contract ABI

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ame":"curDurationId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"exists","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256[]","name":"durationIds","type":"uint256[]"}],"name":"gc","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getDoNftInfo","outputs":[{"internalType":"uint256","name":"oid","type":"uint256"},{"internalType":"uint256[]","name":"durationIds","type":"uint256[]"},{"internalType":"uint64[]","name":"starts","type":"uint64[]"},{"internalType":"uint64[]","name":"ends","type":"uint64[]"},{"internalType":"uint64","name":"nonce","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"durationId","type":"uint256"}],"name":"getDuration","outputs":[{"internalType":"uint64","name":"","type":"uint64"},{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"getDurationByIndex","outputs":[{"internalType":"uint256","name":"durationId","type":"uint256"},{"internalType":"uint64","name":"start","type":"uint64"},{"internalType":"uint64","name":"end","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getDurationIdList","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getDurationListLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getFingerprint","outputs":[{"internalType":"bytes32","name":"print","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getNonce","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getOriginalNftAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getOriginalNftId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"originalNftId","type":"uint256"}],"name":"getUser","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"oid","type":"uint256"}],"name":"getWNftId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"originalNftId","type":"uint256"}],"name":"getXNftId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"address_","type":"address"},{"internalType":"string","name":"name_","type":"string"},{"internalType":"string","name":"symbol_","type":"string"}],"name":"init","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"isValidNow","outputs":[{"internalType":"bool","name":"isValid","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"isWNft","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isWrap","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"isXNft","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalT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:"_pendingOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

000000000000000000000000f87e31492faf9a91b02ee0deaad50d51d56d5d4d000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000018446f75626c6520446563656e7472616c616e64204c414e4400000000000000000000000000000000000000000000000000000000000000000000000000000006646f4c414e440000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : address_ (address): 0xF87E31492Faf9A91B02Ee0dEAAd50d51d56D5d4d
Arg [1] : name_ (string): Double Decentraland LAND
Arg [2] : symbol_ (string): doLAND

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 000000000000000000000000f87e31492faf9a91b02ee0deaad50d51d56d5d4d
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000018
Arg [4] : 446f75626c6520446563656e7472616c616e64204c414e440000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [6] : 646f4c414e440000000000000000000000000000000000000000000000000000


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://73d06d89b45fdcf72ee629030357568ecaa339891eb6c987b26004b01beb218f
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.