Contract 0xFFc1131dDA0299b804C97c436bC8cFeA019e00a0 1

Token Contract 
 
 
Txn Hash
Method
Block
From
To
Value
0x25e235eda28ff1490a68d70214162a72174239085bbc76cb075f2f3d2fd4084cSet Approval For...(pending)2022-11-27 10:22:4018 hrs 29 mins ago0xfac82af1d16e3b940a08787afa4626a85989656b IN Looki: LOOKI Token0 Ether(Pending)(Pending)
0x8365bf56419f4025e4395fd3334af582671fddf8d44fbb734b1b19bf8bb6ccdaSet Approval For...(pending)2022-11-27 1:52:371 day 2 hrs ago0xee6f2d4d7bf30ed5261667d5e7510b36df29d186 IN Looki: LOOKI Token0 Ether(Pending)(Pending)
0x320c5ca38851c222e56a4b6040884dcb90059fabb59335b0669f76f6f376e6d2Set Approval For...(pending)2022-11-27 1:52:371 day 2 hrs ago0xee6f2d4d7bf30ed5261667d5e7510b36df29d186 IN Looki: LOOKI Token0 Ether(Pending)(Pending)
0xe9eb459cde0b6a20d6077f919ed26c64dd3303e74edd588b5ec0ffacf177f0bfSet Approval For...(pending)2022-11-27 1:52:371 day 2 hrs ago0xee6f2d4d7bf30ed5261667d5e7510b36df29d186 IN Looki: LOOKI Token0 Ether(Pending)(Pending)
0xc9db31d8c8fae6b2d85b93d1e99d80fdcf74b36db90ccc586b783cc7fe94142dSet Approval For...(pending)2022-11-27 1:52:371 day 2 hrs ago0xee6f2d4d7bf30ed5261667d5e7510b36df29d186 IN Looki: LOOKI Token0 Ether(Pending)(Pending)
0x02675bde35ae3d507acb8774b919fc1befec1bc758e224c139d0b72f353f1144Set Approval For...(pending)2022-11-27 1:52:371 day 2 hrs ago0xee6f2d4d7bf30ed5261667d5e7510b36df29d186 IN Looki: LOOKI Token0 Ether(Pending)(Pending)
0x09cf3e7b8478b001552c8599fc80d0666d029a319613fde9bd05b9a2d2ac750bSet Approval For...(pending)2022-11-27 1:52:331 day 2 hrs ago0xee6f2d4d7bf30ed5261667d5e7510b36df29d186 IN Looki: LOOKI Token0 Ether(Pending)(Pending)
0x398bb1c235f4803e7f0d0845fdfffb9439788fb1fe98af92bfa9be26e132bafaSet Approval For...160660672022-11-28 4:23:2328 mins ago0xe1f135dcbfb5c5faf809e8b6f69b5238aa1b17c4 IN  Looki: LOOKI Token0 Ether0.00050748 10.96254254
0x2f51bfe7a90433bc0ed9b114208e72ec00d49d7d9cc96502597b665204fa79b5Set Approval For...160659972022-11-28 4:09:2342 mins ago0x677a3ad9db3fbb389ec8823beba627940f9a503c IN  Looki: LOOKI Token0 Ether0.00050114 10.82557966
0x4ce42cd7dbe95833acb507e56161edafafd04aeeef81f46d1bd541d528606644Set Approval For...160656862022-11-28 3:07:111 hr 44 mins ago0x700e1f3a47fd44bf95e5299c3a2ac83d843049b2 IN  Looki: LOOKI Token0 Ether0.00059843 12.92707425
0xefcc0bd897b0907bddde7f0103fa7f1dbb82fda6ffca24de71dc8f629628f9e6Set Approval For...160655802022-11-28 2:45:472 hrs 5 mins ago0x3aed6ac5b8aa4a1c70698eb86706414d45df97fa IN  Looki: LOOKI Token0 Ether0.00051645 11.1562166
0x0424bbdec122b500d12900271a23de57cacafff154f1d807aa9414711037fe65Set Approval For...160655092022-11-28 2:31:232 hrs 20 mins ago0x66e3b762bd96095c20bca9bf3aa9b1ea2638ccd4 IN  Looki: LOOKI Token0 Ether0.00048129 10.39661518
0xf52e3509532a0d2c8871212f7d09a14440884579ba2b1434fc3017f7cbaa3659Set Approval For...160654782022-11-28 2:25:112 hrs 26 mins ago0xe8e7382df9700bffdfaf339b34622ed14044fe44 IN  Looki: LOOKI Token0 Ether0.0004783 10.33209871
0x20439b4ae842143cc7d1834f3d475796836de476e7542dc938b7c6460e7a3975Set Approval For...160652212022-11-28 1:33:353 hrs 18 mins ago0xbea9f405dcd0bc248e519e2755e89939c3373fac IN  Looki: LOOKI Token0 Ether0.00074486 16.09026792
0x14cfe82398ed594cfa094fa9171c3c1667a9c75ac130937c63c68014a13c7de2Set Approval For...160651812022-11-28 1:25:353 hrs 26 mins ago0xbaba65d064691f5bb57b28c0cea5a6d712ccdb99 IN  Looki: LOOKI Token0 Ether0.00064144 13.85625664
0xa9944de3b04c97974d953ad20587a6892b7fed22ec80e13a93600df950fbfcc4Set Approval For...160647702022-11-28 0:02:594 hrs 48 mins ago0x605785073858481ade19387150538a0cedabbe0d IN  Looki: LOOKI Token0 Ether0.00055732 12.03917854
0x9f80ded1969f0ce24f0f8697fd18c73b43c9afd08e7e8fa3dbabc609997ff192Set Approval For...160643272022-11-27 22:33:236 hrs 18 mins ago0xef58892ea50195a0d72929e8ecadbc03f33c3ce8 IN  Looki: LOOKI Token0 Ether0.00045328 9.80935816
0xe5e480d4d8e36a7656cc9c2da7ecb9692c6ecf5823966a067cafbae9a22cd064Set Approval For...160642262022-11-27 22:13:116 hrs 38 mins ago0xef58892ea50195a0d72929e8ecadbc03f33c3ce8 IN  Looki: LOOKI Token0 Ether0.00048557 10.49195706
0x7f3a6e12b1b0902c7c2baa8a724f4794a100ea196056759221d98c0f3319324dSafe Transfer Fr...160637832022-11-27 20:43:358 hrs 8 mins ago0xac58f2389d50f2695884efcad9b955ecb1e14b16 IN  Looki: LOOKI Token0 Ether0.00100228 10.21450189
0x174356f755fcebdb1baeffbc5566322b51db9c68418bd27a6075a95cf9e4a003Set Approval For...160634532022-11-27 19:37:119 hrs 14 mins ago0x91cfe50eb394be78e053ecb7233ccff45391dfe9 IN  Looki: LOOKI Token0 Ether0.00065108 14.06453779
0xd6ca9aee42339c235da55d56839d83f735cf1aeec31757d269127c95d4f135a0Safe Transfer Fr...160634462022-11-27 19:35:479 hrs 15 mins ago0x5e6bd4239fb3eda878dd8c8eeb92679e0799199c IN  Looki: LOOKI Token0 Ether0.00148856 15.17025559
0x2fcd5135b2e00239221f72d8960a8dc04b4284f4c4155ed16ea0f3f1b363550cSafe Transfer Fr...160634452022-11-27 19:35:359 hrs 16 mins ago0x5e6bd4239fb3eda878dd8c8eeb92679e0799199c IN  Looki: LOOKI Token0 Ether0.00132753 15.46810102
0x21be1bd1e087316021dac0e47dd7468d1f3125d9216e2690089fb031884e68e7Safe Transfer Fr...160634442022-11-27 19:35:239 hrs 16 mins ago0x871b67e9467e0768539f56e13d3020866c0d9738 IN  Looki: LOOKI Token0 Ether0.0014931 15.21654619
0x8c4b997636c16ff441ad63dca64b2f6c5293ab25333024abc41c4ace54955ca3Safe Transfer Fr...160634392022-11-27 19:34:239 hrs 17 mins agoENS Name yuanhai.eth IN  Looki: LOOKI Token0 Ether0.00174067 18.26062056
0x88673dbe5ffacdb644c1b54c28b43c5e5f3508c3593b39de78da87ab4c99f12dSet Approval For...160630592022-11-27 18:17:2310 hrs 34 mins ago0x9b4717647099ccaf774ec53e9fa69d578e2ba5da IN  Looki: LOOKI Token0 Ether0.00048042 10.39680088
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OVERVIEW

Looki, the Galaxy Forger, is one of the oldest celestial creatures in existence. His will is responsible for the creation of countless stars, constellations, and planets, including Mars and even the Metamon World.Total supply: ≤ 10k.

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Contract Source Code Verified (Exact Match)

Contract Name:
LOOKI

Compiler Version
v0.8.11+commit.d7f03943

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 36 : LOOKI.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import '../utils/NFT721.sol';

contract LOOKI is NFT721 {
    constructor() NFT721('Looki', 'LOOKI', 'https://racawebsource.s3.us-east-2.amazonaws.com/metadata/2d/looki/') {}
}

File 2 of 36 : NFT721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import '@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol';
import '@openzeppelin/contracts/token/ERC721/extensions/ERC721Pausable.sol';
import '@openzeppelin/contracts/token/ERC721/extensions/ERC721Royalty.sol';
import '../../lib/ERC721L/contracts/EIP5058/extensions/ERC5058Bound.sol';
import '../../lib/ERC721L/contracts/utils/ERC721Attachable.sol';
import './UriRoleBaseTokenURI.sol';
import './WithdrawerRoleWithdraw.sol';
import './PauserRolePausable.sol';

contract NFT721 is
    PauserRolePausable,
    WithdrawerRoleWithdraw,
    UriRoleBaseTokenURI,
    ERC721Enumerable,
    ERC721Pausable,
    ERC5058Bound,
    ERC721Attachable,
    ERC721Royalty
{
    bytes32 public constant MINTER_ROLE = keccak256('MINTER_ROLE');
    bytes32 public constant BURNER_ROLE = keccak256('BURNER_ROLE');
    bytes32 public constant UNBIND_ROLE = keccak256('UNBIND_ROLE');

    constructor(
        string memory _name,
        string memory _symbol,
        string memory _baseTokenURI
    ) ERC721(_name, _symbol) UriRoleBaseTokenURI(_baseTokenURI) {
        _grantRole(DEFAULT_ADMIN_ROLE, _msgSender());
        _grantRole(MINTER_ROLE, _msgSender());
        _grantRole(BURNER_ROLE, _msgSender());
        _grantRole(UNBIND_ROLE, _msgSender());
    }

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

    function safeMint(
        address to,
        uint256 tokenId,
        bytes memory data
    ) external onlyRole(MINTER_ROLE) {
        _safeMint(to, tokenId, data);
    }

    function lockMint(
        address to,
        uint256 tokenId,
        uint256 expired,
        bytes memory data
    ) external onlyRole(MINTER_ROLE) {
        _safeLockMint(to, tokenId, expired, data);
    }

    function mint(address to, uint256 tokenId) external onlyRole(MINTER_ROLE) {
        _mint(to, tokenId);
    }

    function mintBatch(address to, uint256[] calldata tokenIds) external onlyRole(MINTER_ROLE) {
        for (uint256 i; i < tokenIds.length; i++) {
            _mint(to, tokenIds[i]);
        }
    }

    function mintRange(
        address to,
        uint256 fromId,
        uint256 toId
    ) external onlyRole(MINTER_ROLE) {
        for (; fromId <= toId; fromId++) {
            _mint(to, fromId);
        }
    }

    function burn(uint256 tokenId) external {
        require(
            _isApprovedOrOwner(_msgSender(), tokenId) ||
                hasRole(BURNER_ROLE, _msgSender()) ||
                masterOf(tokenId) == _msgSender(),
            'ERC721: caller is not owner nor approved'
        );

        _burn(tokenId);
    }

    function slaveMint(
        address to,
        uint256 tokenId,
        address collection,
        uint256 hostTokenId
    ) external onlyRole(MINTER_ROLE) {
        _slaveMint(to, tokenId, collection, hostTokenId);
    }

    function removeSlave(uint256 tokenId) external {
        require(hasRole(UNBIND_ROLE, _msgSender()) || masterOf(tokenId) == _msgSender(), 'ERC721: not unbind role');

        _removeSlave(tokenId);
    }

    function removeMaster(uint256 tokenId) external onlyRole(UNBIND_ROLE) {
        _removeMaster(tokenId);
    }

    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override(ERC721, ERC721Attachable) {
        super.transferFrom(from, to, tokenId);
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override(ERC721, ERC721Attachable) {
        super.safeTransferFrom(from, to, tokenId, _data);
    }

    function setRoleAdmin(bytes32 roleId, bytes32 adminRoleId) external onlyOwner {
        _setRoleAdmin(roleId, adminRoleId);
    }

    function setFactory(address factory) external onlyOwner {
        _setFactory(factory);
    }

    function setDefaultRoyaltyInfo(address receiver, uint96 feeNumerator) external onlyOwner {
        _setDefaultRoyalty(receiver, feeNumerator);
    }

    function deleteDefaultRoyalty() external onlyOwner {
        _deleteDefaultRoyalty();
    }

    function setTokenRoyalty(
        uint256 tokenId,
        address recipient,
        uint96 fraction
    ) external onlyOwner {
        _setTokenRoyalty(tokenId, recipient, fraction);
    }

    function resetTokenRoyalty(uint256 tokenId) external onlyOwner {
        _resetTokenRoyalty(tokenId);
    }

    function _baseURI() internal view override(UriRoleBaseTokenURI, ERC721) returns (string memory) {
        return UriRoleBaseTokenURI._baseURI();
    }

    function _burn(uint256 tokenId) internal virtual override(ERC721, ERC721Royalty, ERC5058, ERC721Attachable) {
        super._burn(tokenId);
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override(ERC721, ERC721Enumerable, ERC721Pausable, ERC5058) {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(ERC721, ERC721Enumerable, ERC5058, ERC721Royalty, AccessControlEnumerable)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }
}

File 3 of 36 : ERC721Enumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @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 4 of 36 : ERC721Pausable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Pausable.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "../../../security/Pausable.sol";

/**
 * @dev ERC721 token with pausable token transfers, minting and burning.
 *
 * Useful for scenarios such as preventing trades until the end of an evaluation
 * period, or having an emergency switch for freezing all token transfers in the
 * event of a large bug.
 */
abstract contract ERC721Pausable is ERC721, Pausable {
    /**
     * @dev See {ERC721-_beforeTokenTransfer}.
     *
     * Requirements:
     *
     * - the contract must not be paused.
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        require(!paused(), "ERC721Pausable: token transfer while paused");
    }
}

File 5 of 36 : ERC721Royalty.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/ERC721Royalty.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "../../common/ERC2981.sol";
import "../../../utils/introspection/ERC165.sol";

/**
 * @dev Extension of ERC721 with the ERC2981 NFT Royalty Standard, a standardized way to retrieve royalty payment
 * information.
 *
 * Royalty information can be specified globally for all token ids via {_setDefaultRoyalty}, and/or individually for
 * specific token ids via {_setTokenRoyalty}. The latter takes precedence over the first.
 *
 * IMPORTANT: ERC-2981 only specifies a way to signal royalty information and does not enforce its payment. See
 * https://eips.ethereum.org/EIPS/eip-2981#optional-royalty-payments[Rationale] in the EIP. Marketplaces are expected to
 * voluntarily pay royalties together with sales, but note that this standard is not yet widely supported.
 *
 * _Available since v4.5._
 */
abstract contract ERC721Royalty is ERC2981, ERC721 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721, ERC2981) returns (bool) {
        return super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {ERC721-_burn}. This override additionally clears the royalty information for the token.
     */
    function _burn(uint256 tokenId) internal virtual override {
        super._burn(tokenId);
        _resetTokenRoyalty(tokenId);
    }
}

File 6 of 36 : ERC5058Bound.sol
// SPDX-License-Identifier: MIT
// Creator: [email protected]

pragma solidity ^0.8.8;

import "../factory/IERC5058Factory.sol";
import "../factory/IERC721Bound.sol";
import "../ERC5058.sol";

abstract contract ERC5058Bound is ERC5058 {
    address public bound;

    function _setFactory(address _factory) internal {
        bound = IERC5058Factory(_factory).boundOf(address(this));
    }

    function _setBoundBaseTokenURI(string memory uri) internal {
        IERC721Bound(bound).setBaseTokenURI(uri);
    }

    function _setBoundContractURI(string memory uri) internal {
        IERC721Bound(bound).setContractURI(uri);
    }

    function burnBound(uint256 tokenId) external {
        IERC721Bound(bound).burn(tokenId);
    }

    // NOTE:
    //
    // this will be called when `lockFrom` or `unlockFrom`
    function _afterTokenLock(
        address operator,
        address from,
        uint256 tokenId,
        uint256 expired
    ) internal virtual override {
        super._afterTokenLock(operator, from, tokenId, expired);

        if (bound != address(0)) {
            if (expired != 0) {
                // lock mint
                if (operator != address(0)) {
                    IERC721Bound(bound).safeMint(msg.sender, tokenId, "");
                }
            } else {
                // unlock
                if (IERC721Bound(bound).exists(tokenId)) {
                    IERC721Bound(bound).burn(tokenId);
                }
            }
        }
    }
}

File 7 of 36 : ERC721Attachable.sol
// SPDX-License-Identifier: MIT
// Creator: [email protected]

pragma solidity ^0.8.8;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";

interface IBoundERC721Receiver {
    function onBoundERC721Received(
        address operator,
        address to,
        uint256 boundTokenId,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

interface IERC721Burnable {
    function burn(uint256 tokenId) external;

    function removeSlave(uint256 tokenId) external;
}

// @dev The implementation is to bind the NFT (master) and its airdrop NFT (slave).
// The airdrop NFT cannot be transferred or sold separately.
// The slave nfts will be transferred or sold with the master nft.
abstract contract ERC721Attachable is Ownable, ERC721 {
    using EnumerableSet for EnumerableSet.AddressSet;

    struct BoundToken {
        address collection;
        uint256 tokenId;
    }

    // slave tokenId => master token
    mapping(uint256 => BoundToken) public slaveTokens;
    // master tokenId => slave token
    mapping(uint256 => BoundToken[]) private _masterTokens;
    // collection => tokenId => index
    mapping(address => mapping(uint256 => uint256)) private _slaveTokenIndex;

    EnumerableSet.AddressSet private _slaveCollections;

    // Grant the specified address the permission to transfer slave nft for airdrop NFT deposit into the game contract.
    EnumerableSet.AddressSet private _transferApprovals;

    event CollectionRemoved(address indexed collection);
    event CollectionAdded(address indexed collection);

    event TransferApprove(address indexed operator);
    event TransferDisapprove(address indexed operator);

    function allSlaveTokenLength(uint256 tokenId) public view returns (uint256) {
        return _masterTokens[tokenId].length;
    }

    function addCollection(address collection) external onlyOwner {
        require(!_slaveCollections.contains(collection), "ERC721Attachable: collection already slave");
        _slaveCollections.add(collection);

        emit CollectionAdded(collection);
    }

    function removeCollection(address collection) external onlyOwner {
        require(_slaveCollections.contains(collection), "ERC721Attachable: collection not slave");
        _slaveCollections.remove(collection);

        emit CollectionRemoved(collection);
    }

    function isSlaveCollection(address collection) public view returns (bool) {
        return _slaveCollections.contains(collection);
    }

    function addTransferApproval(address operator) external onlyOwner {
        require(!_transferApprovals.contains(operator), "ERC721Attachable: already approved");
        _transferApprovals.add(operator);

        emit TransferApprove(operator);
    }

    function removeTransferApproval(address operator) external onlyOwner {
        require(_transferApprovals.contains(operator), "ERC721Attachable: not approved");
        _transferApprovals.remove(operator);

        emit TransferDisapprove(operator);
    }

    function isTransferApproval(address operator) public view returns (bool) {
        return _transferApprovals.contains(operator);
    }

    function isSlaveToken(uint256 tokenId) public view returns (bool) {
        return slaveTokens[tokenId].collection != address(0);
    }

    function masterOf(uint256 tokenId) public view returns (address) {
        require(isSlaveToken(tokenId), "ERC721Attachable: not slave token");

        return slaveTokens[tokenId].collection;
    }

    function slaveTokenByIndex(uint256 tokenId, uint256 index) public view returns (BoundToken memory) {
        require(index < _masterTokens[tokenId].length, "ERC721Attachable: tokenId index out of bounds");
        return _masterTokens[tokenId][index];
    }

    function _slaveMint(
        address to,
        uint256 tokenId,
        address collection,
        uint256 masterTokenId
    ) internal virtual {
        BoundToken storage at = slaveTokens[tokenId];
        at.collection = collection;
        at.tokenId = masterTokenId;

        require(
            _checkOnBoundERC721Received(collection, to, tokenId, masterTokenId, ""),
            "ERC721Attachable: transfer to non BoundERC721Receiver implementer"
        );

        _mint(to, tokenId);
    }

    function _removeSlave(uint256 tokenId) internal virtual {
        require(isSlaveToken(tokenId), "ERC721Attachable: not slave token");

        BoundToken storage at = slaveTokens[tokenId];
        require(
            _checkOnBoundERC721Received(at.collection, address(0), tokenId, at.tokenId, ""),
            "ERC721Attachable: transfer to non BoundERC721Receiver implementer"
        );

        delete slaveTokens[tokenId];
    }

    function _removeMaster(uint256 tokenId) internal virtual {
        require(allSlaveTokenLength(tokenId) > 0, "ERC721Attachable: no slave token");

        uint256 slaveNum = allSlaveTokenLength(tokenId);
        for (uint256 i = 0; i < slaveNum; i++) {
            IERC721Burnable(_masterTokens[tokenId][i].collection).removeSlave(_masterTokens[tokenId][i].tokenId);
        }
        delete _masterTokens[tokenId];
    }

    /**
     * @dev See {ERC721-_burn}.
     */
    function _burn(uint256 tokenId) internal virtual override {
        super._burn(tokenId);

        BoundToken storage at = slaveTokens[tokenId];
        if (at.collection != address(0)) {
            require(
                _checkOnBoundERC721Received(at.collection, address(0), tokenId, at.tokenId, ""),
                "ERC721Attachable: transfer to non BoundERC721Receiver implementer"
            );

            delete slaveTokens[tokenId];
        }

        uint256 slaveNum = allSlaveTokenLength(tokenId);
        if (slaveNum > 0) {
            for (uint256 i = 0; i < slaveNum; i++) {
                IERC721Burnable(_masterTokens[tokenId][i].collection).burn(_masterTokens[tokenId][i].tokenId);
            }
            delete _masterTokens[tokenId];
        }
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        if (slaveTokens[tokenId].collection != address(0)) {
            if (msg.sender == slaveTokens[tokenId].collection) {
                _transfer(from, to, tokenId);
            } else {
                require(_transferApprovals.contains(msg.sender), "ERC721Attachable: slave token transfer not allowed");
                super.transferFrom(from, to, tokenId);
            }
        } else {
            super.transferFrom(from, to, tokenId);

            for (uint256 i = 0; i < _masterTokens[tokenId].length; i++) {
                IERC721(_masterTokens[tokenId][i].collection).transferFrom(from, to, _masterTokens[tokenId][i].tokenId);
            }
        }
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) public virtual override {
        if (slaveTokens[tokenId].collection != address(0)) {
            if (msg.sender == slaveTokens[tokenId].collection) {
                _safeTransfer(from, to, tokenId, data);
            } else {
                require(_transferApprovals.contains(msg.sender), "ERC721Attachable: slave token transfer not allowed");
                super.safeTransferFrom(from, to, tokenId, data);
            }
        } else {
            super.safeTransferFrom(from, to, tokenId, data);

            for (uint256 i = 0; i < _masterTokens[tokenId].length; i++) {
                IERC721(_masterTokens[tokenId][i].collection).safeTransferFrom(
                    from,
                    to,
                    _masterTokens[tokenId][i].tokenId,
                    data
                );
            }
        }
    }

    function onBoundERC721Received(
        address, /*operator*/
        address to,
        uint256 boundTokenId,
        uint256 tokenId,
        bytes calldata /*data*/
    ) external returns (bytes4) {
        require(isSlaveCollection(msg.sender), "ERC721Attachable: slave to non boundERC721 receiver");

        if (to != address(0)) {
            require(ownerOf(tokenId) == to, "ERC721Attachable: slave to incorrect owner");

            _slaveTokenIndex[msg.sender][boundTokenId] = _masterTokens[tokenId].length;

            _masterTokens[tokenId].push(BoundToken(msg.sender, boundTokenId));
        } else {
            _removeTokenFromMasterTokens(tokenId, msg.sender, boundTokenId);
        }

        return this.onBoundERC721Received.selector;
    }

    function _checkOnBoundERC721Received(
        address from,
        address to,
        uint256 tokenId,
        uint256 masterTokenId,
        bytes memory _data
    ) private returns (bool) {
        try IBoundERC721Receiver(from).onBoundERC721Received(msg.sender, to, tokenId, masterTokenId, _data) returns (
            bytes4 retval
        ) {
            return retval == IBoundERC721Receiver.onBoundERC721Received.selector;
        } catch (bytes memory reason) {
            if (reason.length == 0) {
                revert("ERC721Attachable: transfer to non BoundERC721Receiver implementer");
            } else {
                assembly {
                    revert(add(32, reason), mload(reason))
                }
            }
        }
    }

    function _removeTokenFromMasterTokens(
        uint256 tokenId,
        address collection,
        uint256 boundTokenId
    ) private {
        uint256 lastTokenIndex = _masterTokens[tokenId].length - 1;
        uint256 tokenIndex = _slaveTokenIndex[collection][boundTokenId];

        BoundToken storage bToken = _masterTokens[tokenId][lastTokenIndex];
        _masterTokens[tokenId][tokenIndex] = BoundToken(bToken.collection, bToken.tokenId);
        _slaveTokenIndex[bToken.collection][bToken.tokenId] = tokenIndex;

        delete _slaveTokenIndex[collection][boundTokenId];
        _masterTokens[tokenId].pop();
    }
}

File 8 of 36 : UriRoleBaseTokenURI.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.8;

import '@openzeppelin/contracts/security/Pausable.sol';
import '@openzeppelin/contracts/access/AccessControlEnumerable.sol';

/**
@notice ERC721 extension that overrides the OpenZeppelin _baseURI() function to
return a prefix that can be set by the contract owner.
 */
abstract contract UriRoleBaseTokenURI is AccessControlEnumerable {
    bytes32 public constant SET_BASE_TOKEN_URI_ROLE = keccak256('SET_BASE_TOKEN_URI_ROLE');
    /// @notice Base token URI used as a prefix by tokenURI().
    string public baseTokenURI;

    constructor(string memory _baseTokenURI) {
        _grantRole(SET_BASE_TOKEN_URI_ROLE, _msgSender());
        setBaseTokenURI(_baseTokenURI);
    }

    /// @notice Sets the base token URI prefix.
    function setBaseTokenURI(string memory _baseTokenURI) public onlyRole(SET_BASE_TOKEN_URI_ROLE) {
        baseTokenURI = _baseTokenURI;
    }

    /**
    @notice Concatenates and returns the base token URI and the token ID without
    any additional characters (e.g. a slash).
    @dev This requires that an inheriting contract that also inherits from OZ's
    ERC721 will have to override both contracts; although we could simply
    require that users implement their own _baseURI() as here, this can easily
    be forgotten and the current approach guides them with compiler errors. This
    favours the latter half of "APIs should be easy to use and hard to misuse"
    from https://www.infoq.com/articles/API-Design-Joshua-Bloch/.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return baseTokenURI;
    }
}

File 9 of 36 : WithdrawerRoleWithdraw.sol
// SPDX-License-Identifier: MIT
// Creator: [email protected]

pragma solidity ^0.8.8;

import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import '@openzeppelin/contracts/token/ERC721/IERC721.sol';
import '@openzeppelin/contracts/access/AccessControlEnumerable.sol';

abstract contract WithdrawerRoleWithdraw is AccessControlEnumerable {
    using SafeERC20 for IERC20;
    bytes32 public constant WITHDRAWER_ROLE = keccak256('WITHDRAWER_ROLE');

    constructor() {
        _grantRole(WITHDRAWER_ROLE, _msgSender());
    }

    function withdraw(address payable _receiver, uint256 _amount) external onlyRole(WITHDRAWER_ROLE) {
        Address.sendValue(_receiver, _amount);
    }

    function withdrawERC20(
        address _tokenAddress,
        address _receiver,
        uint256 _amount
    ) external onlyRole(WITHDRAWER_ROLE) {
        IERC20(_tokenAddress).transfer(_receiver, _amount);
    }

    function withdrawERC721(
        address _tokenAddress,
        address _receiver,
        uint256[] memory _tokenIds
    ) external onlyRole(WITHDRAWER_ROLE) {
        for (uint256 i; i < _tokenIds.length; ++i) {
            IERC721(_tokenAddress).transferFrom(address(this), _receiver, _tokenIds[i]);
        }
    }
}

File 10 of 36 : PauserRolePausable.sol
// SPDX-License-Identifier: MIT
// Creator: [email protected]

pragma solidity ^0.8.8;

import '@openzeppelin/contracts/security/Pausable.sol';
import '@openzeppelin/contracts/access/AccessControlEnumerable.sol';

abstract contract PauserRolePausable is AccessControlEnumerable, Pausable {
    bytes32 public constant PAUSER_ROLE = keccak256('PAUSER_ROLE');
    bytes32 public constant UNPAUSER_ROLE = keccak256('UNPAUSER_ROLE');

    constructor() {
        _grantRole(PAUSER_ROLE, _msgSender());
        _grantRole(UNPAUSER_ROLE, _msgSender());
    }

    function pause() public onlyRole(PAUSER_ROLE) {
        Pausable._pause();
    }

    function unpause() public onlyRole(UNPAUSER_ROLE) {
        Pausable._unpause();
    }
}

File 11 of 36 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @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: address zero is not a valid owner");
        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: invalid token ID");
        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) {
        _requireMinted(tokenId);

        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 overridden 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 token owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_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: caller is not token 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: caller is not token 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) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == 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);

        _afterTokenTransfer(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);

        _afterTokenTransfer(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 from incorrect owner");
        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);

        _afterTokenTransfer(from, to, tokenId);
    }

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

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @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 {
                    /// @solidity memory-safe-assembly
                    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 {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

File 12 of 36 : IERC721Enumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @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);

    /**
     * @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 13 of 36 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: 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 14 of 36 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// 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 15 of 36 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @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 16 of 36 : Address.sol
// SPDX-License-Identifier: MIT
// 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 17 of 36 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 18 of 36 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @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);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

File 19 of 36 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @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 20 of 36 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

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

File 21 of 36 : Pausable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

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

/**
 * @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 22 of 36 : ERC2981.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/common/ERC2981.sol)

pragma solidity ^0.8.0;

import "../../interfaces/IERC2981.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of the NFT Royalty Standard, a standardized way to retrieve royalty payment information.
 *
 * Royalty information can be specified globally for all token ids via {_setDefaultRoyalty}, and/or individually for
 * specific token ids via {_setTokenRoyalty}. The latter takes precedence over the first.
 *
 * Royalty is specified as a fraction of sale price. {_feeDenominator} is overridable but defaults to 10000, meaning the
 * fee is specified in basis points by default.
 *
 * IMPORTANT: ERC-2981 only specifies a way to signal royalty information and does not enforce its payment. See
 * https://eips.ethereum.org/EIPS/eip-2981#optional-royalty-payments[Rationale] in the EIP. Marketplaces are expected to
 * voluntarily pay royalties together with sales, but note that this standard is not yet widely supported.
 *
 * _Available since v4.5._
 */
abstract contract ERC2981 is IERC2981, ERC165 {
    struct RoyaltyInfo {
        address receiver;
        uint96 royaltyFraction;
    }

    RoyaltyInfo private _defaultRoyaltyInfo;
    mapping(uint256 => RoyaltyInfo) private _tokenRoyaltyInfo;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC165) returns (bool) {
        return interfaceId == type(IERC2981).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @inheritdoc IERC2981
     */
    function royaltyInfo(uint256 _tokenId, uint256 _salePrice) public view virtual override returns (address, uint256) {
        RoyaltyInfo memory royalty = _tokenRoyaltyInfo[_tokenId];

        if (royalty.receiver == address(0)) {
            royalty = _defaultRoyaltyInfo;
        }

        uint256 royaltyAmount = (_salePrice * royalty.royaltyFraction) / _feeDenominator();

        return (royalty.receiver, royaltyAmount);
    }

    /**
     * @dev The denominator with which to interpret the fee set in {_setTokenRoyalty} and {_setDefaultRoyalty} as a
     * fraction of the sale price. Defaults to 10000 so fees are expressed in basis points, but may be customized by an
     * override.
     */
    function _feeDenominator() internal pure virtual returns (uint96) {
        return 10000;
    }

    /**
     * @dev Sets the royalty information that all ids in this contract will default to.
     *
     * Requirements:
     *
     * - `receiver` cannot be the zero address.
     * - `feeNumerator` cannot be greater than the fee denominator.
     */
    function _setDefaultRoyalty(address receiver, uint96 feeNumerator) internal virtual {
        require(feeNumerator <= _feeDenominator(), "ERC2981: royalty fee will exceed salePrice");
        require(receiver != address(0), "ERC2981: invalid receiver");

        _defaultRoyaltyInfo = RoyaltyInfo(receiver, feeNumerator);
    }

    /**
     * @dev Removes default royalty information.
     */
    function _deleteDefaultRoyalty() internal virtual {
        delete _defaultRoyaltyInfo;
    }

    /**
     * @dev Sets the royalty information for a specific token id, overriding the global default.
     *
     * Requirements:
     *
     * - `receiver` cannot be the zero address.
     * - `feeNumerator` cannot be greater than the fee denominator.
     */
    function _setTokenRoyalty(
        uint256 tokenId,
        address receiver,
        uint96 feeNumerator
    ) internal virtual {
        require(feeNumerator <= _feeDenominator(), "ERC2981: royalty fee will exceed salePrice");
        require(receiver != address(0), "ERC2981: Invalid parameters");

        _tokenRoyaltyInfo[tokenId] = RoyaltyInfo(receiver, feeNumerator);
    }

    /**
     * @dev Resets royalty information for the token id back to the global default.
     */
    function _resetTokenRoyalty(uint256 tokenId) internal virtual {
        delete _tokenRoyaltyInfo[tokenId];
    }
}

File 23 of 36 : IERC2981.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (interfaces/IERC2981.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Interface for the NFT Royalty Standard.
 *
 * A standardized way to retrieve royalty payment information for non-fungible tokens (NFTs) to enable universal
 * support for royalty payments across all NFT marketplaces and ecosystem participants.
 *
 * _Available since v4.5._
 */
interface IERC2981 is IERC165 {
    /**
     * @dev Returns how much royalty is owed and to whom, based on a sale price that may be denominated in any unit of
     * exchange. The royalty amount is denominated and should be paid in that same unit of exchange.
     */
    function royaltyInfo(uint256 tokenId, uint256 salePrice)
        external
        view
        returns (address receiver, uint256 royaltyAmount);
}

File 24 of 36 : IERC5058Factory.sol
// SPDX-License-Identifier: MIT
// Creator: [email protected]

pragma solidity ^0.8.8;

interface IERC5058Factory {
    event DeployedBound(address indexed preimage, address bound);

    function allBoundsLength() external view returns (uint256);

    function boundByIndex(uint256 index) external view returns (address);

    function existBound(address preimage) external view returns (bool);

    function boundOf(address preimage) external view returns (address);

    function boundDeploy(address preimage) external returns (address);
}

File 25 of 36 : IERC721Bound.sol
// SPDX-License-Identifier: MIT
// Creator: [email protected]

pragma solidity ^0.8.8;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

interface IERC721Bound is IERC721 {
    function preimage() external view returns (address);

    function contractURI() external view returns (string memory);

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

    function setBaseTokenURI(string memory _baseTokenURI) external;

    function setContractURI(string memory uri) external;

    function safeMint(
        address to,
        uint256 tokenId,
        bytes memory data
    ) external;

    function burn(uint256 tokenId) external;
}

File 26 of 36 : ERC5058.sol
// SPDX-License-Identifier: MIT
// Creator: [email protected]

pragma solidity ^0.8.8;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "./IERC5058.sol";

/**
 * @dev Implementation ERC721 Lockable Token
 */
abstract contract ERC5058 is ERC721, IERC5058 {
    // Mapping from token ID to unlock time
    mapping(uint256 => uint256) public lockedTokens;

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

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

    /**
     * @dev See {IERC5058-lockApprove}.
     */
    function lockApprove(address to, uint256 tokenId) public virtual override {
        require(!isLocked(tokenId), "ERC5058: token is locked");
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC5058: lock approval to current owner");

        require(
            _msgSender() == owner || isLockApprovedForAll(owner, _msgSender()),
            "ERC5058: lock approve caller is not owner nor approved for all"
        );

        _lockApprove(owner, to, tokenId);
    }

    /**
     * @dev See {IERC5058-getLockApproved}.
     */
    function getLockApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC5058: lock approved query for nonexistent token");

        return _lockApprovals[tokenId];
    }

    /**
     * @dev See {IERC5058-lockerOf}.
     */
    function lockerOf(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC5058: locker query for nonexistent token");
        require(isLocked(tokenId), "ERC5058: locker query for non-locked token");

        return _lockApprovals[tokenId];
    }

    /**
     * @dev See {IERC5058-setLockApprovalForAll}.
     */
    function setLockApprovalForAll(address operator, bool approved) public virtual override {
        _setLockApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC5058-isLockApprovedForAll}.
     */
    function isLockApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _lockOperatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC5058-isLocked}.
     */
    function isLocked(uint256 tokenId) public view virtual override returns (bool) {
        return lockedTokens[tokenId] > block.timestamp;
    }

    /**
     * @dev See {IERC5058-lockFrom}.
     */
    function lockFrom(
        address from,
        uint256 tokenId,
        uint256 expired
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isLockApprovedOrOwner(_msgSender(), tokenId), "ERC5058: lock caller is not owner nor approved");
        require(expired > block.timestamp, "ERC5058: expired time must be greater than current block time");
        require(!isLocked(tokenId), "ERC5058: token is locked");

        _lock(_msgSender(), from, tokenId, expired);
    }

    /**
     * @dev See {IERC5058-unlockFrom}.
     */
    function unlockFrom(address from, uint256 tokenId) public virtual override {
        require(lockerOf(tokenId) == _msgSender(), "ERC5058: unlock caller is not lock operator");
        require(ERC721.ownerOf(tokenId) == from, "ERC5058: unlock from incorrect owner");

        _beforeTokenLock(_msgSender(), from, tokenId, 0);

        delete lockedTokens[tokenId];

        emit Unlocked(_msgSender(), from, tokenId);

        _afterTokenLock(_msgSender(), from, tokenId, 0);
    }

    /**
     * @dev Locks `tokenId` from `from`  until `expired`.
     *
     * Requirements:
     *
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Locked} event.
     */
    function _lock(
        address operator,
        address from,
        uint256 tokenId,
        uint256 expired
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC5058: lock from incorrect owner");

        _beforeTokenLock(operator, from, tokenId, expired);

        lockedTokens[tokenId] = expired;
        _lockApprovals[tokenId] = _msgSender();

        emit Locked(operator, from, tokenId, expired);

        _afterTokenLock(operator, from, tokenId, expired);
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`, but the `tokenId` is locked and cannot be transferred.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     *
     * Emits {Locked} and {Transfer} event.
     */
    function _safeLockMint(
        address to,
        uint256 tokenId,
        uint256 expired,
        bytes memory _data
    ) internal virtual {
        require(expired > block.timestamp, "ERC5058: lock mint for invalid lock block time");

        _safeMint(to, tokenId, _data);

        _lock(address(0), to, tokenId, expired);
    }

    /**
     * @dev See {ERC721-_burn}. This override additionally clears the lock approvals for the token.
     */
    function _burn(uint256 tokenId) internal virtual override {
        address owner = ERC721.ownerOf(tokenId);
        super._burn(tokenId);

        _beforeTokenLock(_msgSender(), owner, tokenId, 0);

        // clear lock approvals
        delete lockedTokens[tokenId];
        delete _lockApprovals[tokenId];

        _afterTokenLock(_msgSender(), owner, tokenId, 0);
    }

    /**
     * @dev Approve `to` to lock operate on `tokenId`
     *
     * Emits a {LockApproval} event.
     */
    function _lockApprove(
        address owner,
        address to,
        uint256 tokenId
    ) internal virtual {
        _lockApprovals[tokenId] = to;
        emit LockApproval(owner, to, tokenId);
    }

    /**
     * @dev Approve `operator` to lock operate on all of `owner` tokens
     *
     * Emits a {LockApprovalForAll} event.
     */
    function _setLockApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC5058: lock approve to caller");
        _lockOperatorApprovals[owner][operator] = approved;
        emit LockApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Returns whether `spender` is allowed to lock `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isLockApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC5058: lock operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isLockApprovedForAll(owner, spender) || getLockApproved(tokenId) == spender);
    }

    /**
     * @dev See {ERC721-_beforeTokenTransfer}.
     *
     * Requirements:
     *
     * - the `tokenId` must not be locked.
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        require(!isLocked(tokenId), "ERC5058: token transfer while locked");
    }

    /**
     * @dev Hook that is called before any token lock/unlock.
     *
     * Calling conditions:
     *
     * - `from` is non-zero.
     * - When `expired` is zero, `tokenId` will be unlock for `from`.
     * - When `expired` is non-zero, ``from``'s `tokenId` will be locked.
     *
     */
    function _beforeTokenLock(
        address operator,
        address from,
        uint256 tokenId,
        uint256 expired
    ) internal virtual {}

    /**
     * @dev Hook that is called after any lock/unlock of tokens.
     *
     * Calling conditions:
     *
     * - `from` is non-zero.
     * - When `expired` is zero, `tokenId` will be unlock for `from`.
     * - When `expired` is non-zero, ``from``'s `tokenId` will be locked.
     *
     */
    function _afterTokenLock(
        address operator,
        address from,
        uint256 tokenId,
        uint256 expired
    ) internal virtual {}

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC5058).interfaceId || super.supportsInterface(interfaceId);
    }
}

File 27 of 36 : IERC5058.sol
// SPDX-License-Identifier: MIT
// Creator: [email protected]

pragma solidity ^0.8.8;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

/**
 * @dev ERC-721 Non-Fungible Token Standard, optional lockable extension
 * ERC721 Token that can be locked for a certain period and cannot be transferred.
 * This is designed for a non-escrow staking contract that comes later to lock a user's NFT
 * while still letting them keep it in their wallet.
 * This extension can ensure the security of user tokens during the staking period.
 * If the nft lending protocol is compatible with this extension, the trouble caused by the NFT
 * airdrop can be avoided, because the airdrop is still in the user's wallet
 */
interface IERC5058 is IERC721 {
    /**
     * @dev Emitted when `tokenId` token is locked by `operator` from `from`.
     */
    event Locked(address indexed operator, address indexed from, uint256 indexed tokenId, uint256 expired);

    /**
     * @dev Emitted when `tokenId` token is unlocked by `operator` from `from`.
     */
    event Unlocked(address indexed operator, address indexed from, uint256 indexed tokenId);

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

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

    /**
     * @dev Returns the locker who is locking the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function lockerOf(uint256 tokenId) external view returns (address locker);

    /**
     * @dev Lock `tokenId` token until the block number is greater than `expired` to be unlocked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - `expired` must be greater than block.timestamp
     * - If the caller is not `from`, it must be approved to lock this token
     * by either {lockApprove} or {setLockApprovalForAll}.
     *
     * Emits a {Locked} event.
     */
    function lockFrom(
        address from,
        uint256 tokenId,
        uint256 expired
    ) external;

    /**
     * @dev Unlock `tokenId` token.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - the caller must be the operator who locks the token by {lockFrom}
     *
     * Emits a {Unlocked} event.
     */
    function unlockFrom(address from, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to lock `tokenId` token.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved lock operator.
     * - `tokenId` must exist.
     *
     * Emits an {LockApproval} event.
     */
    function lockApprove(address to, uint256 tokenId) external;

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

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

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

    /**
     * @dev Returns if the `tokenId` token is locked.
     */
    function isLocked(uint256 tokenId) external view returns (bool);
}

File 28 of 36 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 29 of 36 : EnumerableSet.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/structs/EnumerableSet.sol)

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.
 *
 * [WARNING]
 * ====
 *  Trying to delete such a structure from storage will likely result in data corruption, rendering the structure unusable.
 *  See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 *  In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an array of EnumerableSet.
 * ====
 */
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;

        /// @solidity memory-safe-assembly
        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;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

File 30 of 36 : AccessControlEnumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (access/AccessControlEnumerable.sol)

pragma solidity ^0.8.0;

import "./IAccessControlEnumerable.sol";
import "./AccessControl.sol";
import "../utils/structs/EnumerableSet.sol";

/**
 * @dev Extension of {AccessControl} that allows enumerating the members of each role.
 */
abstract contract AccessControlEnumerable is IAccessControlEnumerable, AccessControl {
    using EnumerableSet for EnumerableSet.AddressSet;

    mapping(bytes32 => EnumerableSet.AddressSet) private _roleMembers;

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

    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) public view virtual override returns (address) {
        return _roleMembers[role].at(index);
    }

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) public view virtual override returns (uint256) {
        return _roleMembers[role].length();
    }

    /**
     * @dev Overload {_grantRole} to track enumerable memberships
     */
    function _grantRole(bytes32 role, address account) internal virtual override {
        super._grantRole(role, account);
        _roleMembers[role].add(account);
    }

    /**
     * @dev Overload {_revokeRole} to track enumerable memberships
     */
    function _revokeRole(bytes32 role, address account) internal virtual override {
        super._revokeRole(role, account);
        _roleMembers[role].remove(account);
    }
}

File 31 of 36 : IAccessControlEnumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControlEnumerable.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";

/**
 * @dev External interface of AccessControlEnumerable declared to support ERC165 detection.
 */
interface IAccessControlEnumerable is IAccessControl {
    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) external view returns (address);

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) external view returns (uint256);
}

File 32 of 36 : AccessControl.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

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

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(uint160(account), 20),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

File 33 of 36 : IAccessControl.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

File 34 of 36 : SafeERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @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 35 of 36 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

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

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

File 36 of 36 : draft-IERC20Permit.sol
// SPDX-License-Identifier: MIT
// 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);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

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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.