Contract 0x70aE45F70983e2F7ea95328Bc6740C7E03F00EaF 1

 

Contract Overview

PolyFriendsClub: PFC Token
Balance:
0 MATIC

MATIC Value:
$0.00
 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x525fc9a856bf1062fc692ff8e9b5f2bdb5a4ac1be978e1864218602f0a473721Set Approval For...336766382022-09-28 15:34:3720 hrs 10 mins ago0xed7e4c3adc2b1d58881cea42a1e8ec1e860c1beb IN  PolyFriendsClub: PFC Token0 MATIC0.001388448825 30.012079318
0x2977e51f7730eca32b8db9bfa0926fe1fcccead710b0bed2022c15e2147460e0Set Approval For...336338792022-09-27 14:47:541 day 20 hrs ago0x683cd5431342aa52cf202f254164bddcc6581ed5 IN  PolyFriendsClub: PFC Token0 MATIC0.001387367194 30.043248986
0x609fbad417823d128de6df8293be75a7cab4fef9bd10601aaebd34bf2fa8ea00Set Approval For...334517022022-09-23 4:09:376 days 7 hrs ago0x50e7f1347f646ad89cb0863438095b5a2454379e IN  PolyFriendsClub: PFC Token0 MATIC0.0023131550
0x409ebcb494035622f6f2fee0d3041e07408e9ff0b759bd2b32eaaef128ce81e6Set Approval For...334319562022-09-22 16:44:056 days 19 hrs ago0x80d40ad01886ac58886edd71fc930184390125e6 IN  PolyFriendsClub: PFC Token0 MATIC0.00147818979 32.010000021
0xab283b3b22d1e6c815d3ab9f43dfcf6ec708c9009e267328ea6b41c5a2cf1eacSet Approval For...333826012022-09-21 12:07:067 days 23 hrs ago0xa87be5dd8a913ef37d59122a738fc609224b5b29 IN  PolyFriendsClub: PFC Token0 MATIC0.0023131550
0x10cc6c40796292df81081c006d47b29e63bc6dc981464a6487b843467d1c7632Set Approval For...333823532022-09-21 11:58:347 days 23 hrs ago0xafb011715e6e22dcad48e7ae78f52dbbc34233c5 IN  PolyFriendsClub: PFC Token0 MATIC0.0023125550
0x84a67841bfadb52d2a812b56b3678f7d96c8b62a904b305fb2f243914ab044bfSet Approval For...331855092022-09-16 16:49:1112 days 18 hrs ago0x194b58b4aaa256912357cd076a0e93bfbe61626d IN  PolyFriendsClub: PFC Token0 MATIC0.0023125550
0x5ce60746431ed592b0f1bcfad1287778fc9d02d9cfb40e578b086dc3dd46cb88Set Approval For...331837022022-09-16 15:47:0112 days 19 hrs ago0x9ed4c77f74eaaa3c595d8bae40de5d592edfb39b IN  PolyFriendsClub: PFC Token0 MATIC0.001697016374 36.681935345
0x5615cd122ba0ba718aa832ead148a4dc2f596446a2fa73e3d62afc7f13422280Set Approval For...331198292022-09-15 2:56:5314 days 8 hrs ago0xda6490e97dfe43ea63f459ad62fe11a446f5e04a IN  PolyFriendsClub: PFC Token0 MATIC0.00148087863 32.010000021
0x568fb86bcfd457e6d587652b2bd8db78b864e2e414a3dff7f6ac3eb87b36aa50Set Approval For...331055972022-09-14 18:44:5114 days 17 hrs ago0x091fbb806d2b4ed31e0f0b7d82534e4489e05588 IN  PolyFriendsClub: PFC Token0 MATIC0.00152390733.000000017
0x094a050b230d52eac42a53c1211b32e9d9d6bafe16d4428ebafa7d07bbc27494Set Approval For...329416752022-09-10 19:59:2418 days 15 hrs ago0x444b0edf8042446455667d8481a5950dc24f7230 IN  PolyFriendsClub: PFC Token0 MATIC0.00165310891535.79785
0x7561a3218a64b78669740d34ba53847cf14eec5ca0b257fcc74f444b98d7e68dSet Approval For...328948302022-09-09 16:48:2619 days 18 hrs ago0xdbadfdead4e9f9c68101375acead49a1e0df7351 IN  PolyFriendsClub: PFC Token0 MATIC0.001686376248 36.518249603
0xf0fb8bc6b09335d7cd76997545dbde06c41b1556e18d50392f9a24673575fa4fSet Approval For...328179732022-09-07 20:26:2121 days 15 hrs ago0xed7625cf642e37d563cc615f0eecb23aa863b69b IN  PolyFriendsClub: PFC Token0 MATIC0.006048193004 130.972801594
0xa53ae71e04665fc1582545cea540948018a985b1ee9422a0f816efd50d8ded53Set Approval For...327650512022-09-06 13:38:5722 days 22 hrs ago0xeea6fd68d24e9069bd75ae9711b689e699017800 IN  PolyFriendsClub: PFC Token0 MATIC0.00143154931
0x00f37f24638fb0eed35201c67a33b48df5acfeaa20cec6a386416921d5a1f6e5Set Approval For...326125322022-09-02 21:31:4626 days 14 hrs ago0xd04dc6ab7535f696381c9caf09ecb249a271778f IN  PolyFriendsClub: PFC Token0 MATIC0.0023131550
0xcc2014411fc7d41f0af2a0b46b6d7f9145d59d145fbad5d2bd9f8eb3cd334322Set Approval For...326043512022-09-02 16:50:0026 days 18 hrs ago0xe0b474d754c20d5316ac0885325cea84a61b0495 IN  PolyFriendsClub: PFC Token0 MATIC0.001656942367 35.815713801
0x27861751c6b407dc20e15a342961e910207cd2f0f0c97402ee160d3a954711c3Set Approval For...326012462022-09-02 15:03:0826 days 20 hrs ago0xe0b474d754c20d5316ac0885325cea84a61b0495 IN  PolyFriendsClub: PFC Token0 MATIC0.001385370001 30.000000024
0x29316d8ed521333b9101ccc518552a46e94f755e41a0146c8ef7d991b52dbb1cSet Approval For...325016812022-08-31 1:50:3329 days 9 hrs ago0x648102f4e0c3b96b78989132ace2f30669e9839c IN  PolyFriendsClub: PFC Token0 MATIC0.001628364458 35.262012147
0xb8a56d5f81afcb3bba89d55c34030e406b9d0efccda220bcdd0db18e252bffc1Set Approval For...324725322022-08-30 6:32:5230 days 5 hrs ago0x22f8ab973e6813482e027b851e361cc41f183da5 IN  PolyFriendsClub: PFC Token0 MATIC0.001433844116 31.049700444
0x151f44ba1853791c38b22c68d3d1e19be478338244f9e39e183f9f7db10f337eSet Approval For...324648602022-08-30 1:12:3830 days 10 hrs ago0x18a61009ec25deddc6508393c97fe93ca2c9ab0a IN  PolyFriendsClub: PFC Token0 MATIC0.001321749017 50.296777562
0xc9bc086b469bafae4441ec59794707eebaf60cb6b97d8ccc7f7e72687d8eee93Set Approval For...324648602022-08-30 1:12:3830 days 10 hrs ago0x18a61009ec25deddc6508393c97fe93ca2c9ab0a IN  PolyFriendsClub: PFC Token0 MATIC0.002322654891 50.296777562
0x64241d1adc70748df476246a3ad72050a5f833e40dfedfb286b17a8015a373b7Set Approval For...324571642022-08-29 18:48:1830 days 16 hrs ago0xfd102928b94a5fc780e8493d7ba22829cf0d0eba IN  PolyFriendsClub: PFC Token0 MATIC0.0023131550
0x324002ee395222294d3f24021feb9402273ca64a20c8d3929cb7c5027fdfec96Set Approval For...324258572022-08-28 21:19:2631 days 14 hrs ago0x17e0bfcedc0993c81c85fbc62ec36cc16cfd6fea IN  PolyFriendsClub: PFC Token0 MATIC0.0023131550
0x4416f9982ad544ade71dad6af7f4730ec95bb9c37fe1273e1710b0613d9a4d22Set Approval For...322495512022-08-24 1:11:4736 days 10 hrs ago0x0621a2f93e8aac8b45d72586d1c63fd936bd9d87 IN  PolyFriendsClub: PFC Token0 MATIC0.00139112841 30.07
0x2123464178d71ba18cc82255467a6d889953681654996c9d83e229fb01594dffSet Approval For...321408082022-08-21 6:01:1539 days 5 hrs ago0x9ed4c77f74eaaa3c595d8bae40de5d592edfb39b IN  PolyFriendsClub: PFC Token0 MATIC0.00138789 30.000000014
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OVERVIEW

The PolyFriends Club (PFC) is a unique and programmatically generated non-fungible token from 100+ possible traits, levels, and attributes. A limited collection of 8888 hand-drawn doodle friends. stored forever on hosted ipfs servers and are secured in Polygon blockchain as ERC-721 tokens.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x06c547f712d0b1caa8fffaff47b1bbf73004147cad10ed23d60f764452976f73316288972022-08-07 16:18:0552 days 19 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c15 MATIC
0x5770e300496d4cd11da85c4f1524d05eb85574189ca846580951e36963a718fd315839942022-08-06 10:36:4254 days 1 hr ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c12 MATIC
0xe03c7546ea81f4ad224212d4ef1c15a09796bc5bc7cb735f492712fa513ad3ab315541962022-08-05 16:17:2054 days 19 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c12 MATIC
0xcaf385f8a972aef5671cd64f50f52bc742bd348260541b944ab24400e00be9b7315275712022-08-04 23:15:3955 days 12 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c9 MATIC
0x1908143629c41d86f40147b27b34dce75dd8bf1ec9444af306f7b3d49fc1d4e3315077552022-08-04 10:47:3256 days 57 mins ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c3 MATIC
0x810dfd72035203b300f367c5f7ef96a2a2aa1fee5fe03ab43af8dfa5e5b84543310228952022-07-22 19:48:1868 days 15 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c3 MATIC
0x1615f2f13b77132430bd2853d14ddc69b050c5d2dc0faff40494c76d98bed324308354142022-07-17 20:17:3573 days 15 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c15 MATIC
0xdf4934df0986981a9d75e16f9c3d3eb517e4f7b48b103c8a25f00a941cfac767299899742022-06-25 18:24:0995 days 17 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c3 MATIC
0x0a07cfe92816faac7e9b7296e1ea65e7e4797455420c07abdf4d6502393eff15294746492022-06-12 11:12:28109 days 32 mins ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c30 MATIC
0x13ce49e9f39a874d86c602eb3ce994bcecf904aa6e53407fbda3ce36bce04c52291586562022-06-04 14:54:38116 days 20 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c3 MATIC
0x21cdef281e9a90015785d4972aa5debdef84a27895e5af8a502a16019065cb03290853912022-06-02 19:21:47118 days 16 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c3 MATIC
0xff0cf2439d3300891370d921a0667b4372d0c23ddbbd95acca41ec5d8c23dbc4288926452022-05-29 0:52:55123 days 10 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c18 MATIC
0x72571b42edd7f1815fa62b1db45cabcfe75f61022d39c5c9ad3ff49e1504a69c286866122022-05-23 21:47:47128 days 13 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c9 MATIC
0xd7ab256c4bc405c0c8b6c6c968dcf7a758356c12ca699cbd9d3903ae5a21346e285464962022-05-20 11:25:56132 days 19 mins ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c9 MATIC
0x56fb7fd62293e0523b39069336088d15cc788c3303e4c64722e1daf1630a5852285241732022-05-19 22:04:45132 days 13 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c9 MATIC
0x1bd1344616ee37d095d625729e5ad28b3e8debef6494ee0a34d30ec96d8ca963283161062022-05-14 17:35:39137 days 18 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c3 MATIC
0x43689d976b64168490107cf3161e452cb06861e3828ab2ea6cb59575cc587448281872042022-05-11 10:31:29141 days 1 hr ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c3 MATIC
0x1362ab81628590c2f4601fe1362f645238396c49061b7d6b7f5a7102a2ffbb6e280110322022-05-07 0:15:24145 days 11 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c9 MATIC
0x4e2d54e4507ead4dabbb1a29ec5338e51731d71e8469fcec65cffc15a4077f50279530242022-05-05 12:46:56146 days 22 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c12 MATIC
0x9b5027d6646f785c890e1d87f73d01dcd3dc66add5df3d58ba118f3b3e63080b279345342022-05-05 1:16:08147 days 10 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c3 MATIC
0xe23d83271c2b27ae1aa02bdf7b31c71866d87506a8736372311ad359ee634b0c279173672022-05-04 14:39:12147 days 21 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c3 MATIC
0xaebe4df6cd1bfb59eacb2a53f962b4ab7cab16392d2555aaee760e8306445f7b277633422022-04-30 17:26:18151 days 18 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c6 MATIC
0xbcd34de457c78e1c8c7405f0e00b8cb47e951893b9574c68869f1f32f734e232276852712022-04-28 17:36:50153 days 18 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c45 MATIC
0xda6a23fa449d380506bd2f4642d975baacbefdd49b98303062c142e4d7c3810b276372322022-04-27 12:40:45154 days 23 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c15 MATIC
0xe14eb01a3a692b4dba87f94b6c586c739edd1ff5fed10bc7f631f94ae80583dc275924132022-04-26 9:28:31156 days 2 hrs ago PolyFriendsClub: PFC Token0x06e14b037650e6d7c5e6a8eb329e1b44e2d7650c9 MATIC
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Loading

Contract Source Code Verified (Exact Match)

Contract Name:
PolyFriendsClub

Compiler Version
v0.8.7+commit.e28d00a7

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at polygonscan.com on 2022-01-23
*/

// SPDX-License-Identifier: MIT

/*

PPPPPPPPPPPPPPPPP     FFFFFFFFFFFFFFFFFFF       CCCCCCCCCCCCC
PP::::::::::::::PP    FF:::::::::::::::FF    CC::::::::::::::CC
PP:::PPPPPPPP::::PP   FF:::FFFFFFFFFFFFFF   CC::::CCCCCCCC::::CC
PP:::PP     PP:::PP   FF:::FF              CC:::CC        CC:::CC
PP:::PP     PP:::PP   FF:::FFFFFFFFFFFFFF  CC:::CC        CCCCCCC
PP:::PPPPPPPP:::PP    FF:::::::::::::::FF  CC:::CC
PP:::::::::::::PP     FF:::FFFFFFFFFFFFFF  CC:::CC
PP:::PPPPPPPPPPP      FF:::FF              CC:::CC 
PP:::PP               FF:::FF              CC:::CC        CCCCCCC
PP:::PP               FF:::FF              CC:::CC        CC:::CC
PP:::PP               FF:::FF               CC::::CCCCCCCC::::CC
PP:::PP               FF:::FF                CC::::::::::::::CC
PPPPPPP               FFFFFFF                  CCCCCCCCCCCCC


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// PolyFriends Club

/*
PolyFriends Club is a randomly generated provably uniqe non funglible token art collectibles.
8888 NFT Friend Collectibles. Polygon Blockchain Non-funglibe tokens.
**/

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol
pragma solidity ^0.8.0;
/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

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

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

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

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

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

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

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

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

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

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

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


// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol
pragma solidity ^0.8.0;
/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

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

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


// File: @openzeppelin/contracts/utils/introspection/ERC165.sol
pragma solidity ^0.8.0;
/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

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



pragma solidity ^0.8.0;

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

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

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

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

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

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



pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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



pragma solidity ^0.8.0;


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

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

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

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol



pragma solidity ^0.8.0;

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

// File: @openzeppelin/contracts/utils/Context.sol
pragma solidity ^0.8.0;
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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


// File: @openzeppelin/contracts/token/ERC721/ERC721.sol
pragma solidity ^0.8.0;
/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _approve(to, tokenId);
    }

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

        return _tokenApprovals[tokenId];
    }

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

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

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

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

        _transfer(from, to, tokenId);
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _beforeTokenTransfer(from, to, tokenId);

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

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

        emit Transfer(from, to, tokenId);
    }

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

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

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

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



pragma solidity ^0.8.0;



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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


// File: @openzeppelin/contracts/access/Ownable.sol
pragma solidity ^0.8.0;
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

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

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

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

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

pragma solidity >=0.7.0 <0.9.0;

contract PolyFriendsClub is ERC721Enumerable, Ownable {
  using Strings for uint256;

  string baseURI;
  string public baseExtension = ".json";
  uint256 public cost = 0.05 ether;
  uint256 public maxSupply = 8888;
  uint256 public maxMintAmount = 5;
  bool public paused = false;
  bool public revealed = false;
  string public notRevealedUri;

  constructor(
    string memory _name,
    string memory _symbol,
    string memory _initBaseURI,
    string memory _initNotRevealedUri
  ) ERC721(_name, _symbol) {
    setBaseURI(_initBaseURI);
    setNotRevealedURI(_initNotRevealedUri);
  }

  // internal
  function _baseURI() internal view virtual override returns (string memory) {
    return baseURI;
  }

  // public
  function mint(uint256 _mintAmount) public payable {
    uint256 supply = totalSupply();
    require(!paused);
    require(_mintAmount > 0);
    require(_mintAmount <= maxMintAmount);
    require(supply + _mintAmount <= maxSupply);

    if (msg.sender != owner()) {
      require(msg.value >= cost * _mintAmount);
    }

    for (uint256 i = 1; i <= _mintAmount; i++) {
      _safeMint(msg.sender, supply + i);
    }
  }

  function walletOfOwner(address _owner)
    public
    view
    returns (uint256[] memory)
  {
    uint256 ownerTokenCount = balanceOf(_owner);
    uint256[] memory tokenIds = new uint256[](ownerTokenCount);
    for (uint256 i; i < ownerTokenCount; i++) {
      tokenIds[i] = tokenOfOwnerByIndex(_owner, i);
    }
    return tokenIds;
  }

  function tokenURI(uint256 tokenId)
    public
    view
    virtual
    override
    returns (string memory)
  {
    require(
      _exists(tokenId),
      "ERC721Metadata: URI query for nonexistent token"
    );
    
    if(revealed == false) {
        return notRevealedUri;
    }

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

  //only owner
  function reveal() public onlyOwner() {
      revealed = true;
  }
  
  function setCost(uint256 _newCost) public onlyOwner() {
    cost = _newCost;
  }

  function setmaxMintAmount(uint256 _newmaxMintAmount) public onlyOwner() {
    maxMintAmount = _newmaxMintAmount;
  }
  
  function setNotRevealedURI(string memory _notRevealedURI) public onlyOwner {
    notRevealedUri = _notRevealedURI;
  }

  function setBaseURI(string memory _newBaseURI) public onlyOwner {
    baseURI = _newBaseURI;
  }

  function setBaseExtension(string memory _newBaseExtension) public onlyOwner {
    baseExtension = _newBaseExtension;
  }

  function pause(bool _state) public onlyOwner {
    paused = _state;
  }
 
  function withdraw() public payable onlyOwner {
    (bool success, ) = payable(msg.sender).call{value: address(this).balance}("");
    require(success);
  }
}

Contract Security Audit

Contract ABI

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

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

-----Decoded View---------------
Arg [0] : _name (string): PolyFriendsClub
Arg [1] : _symbol (string): PFC
Arg [2] : _initBaseURI (string): ipfs://QmZb4YYw4WH9htrATVe55rfjz9VFpGVaNBK3k1DH77RF4h/
Arg [3] : _initNotRevealedUri (string): ipfs://QmNVBpbpB2AmD3pjpLdPb4yyRjoC8bnGUJx5zZWZA5LMWL/Hidden.json

-----Encoded View---------------
15 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000100
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000160
Arg [4] : 000000000000000000000000000000000000000000000000000000000000000f
Arg [5] : 506f6c79467269656e6473436c75620000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [7] : 5046430000000000000000000000000000000000000000000000000000000000
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000036
Arg [9] : 697066733a2f2f516d5a62345959773457483968747241545665353572666a7a
Arg [10] : 395646704756614e424b336b3144483737524634682f00000000000000000000
Arg [11] : 0000000000000000000000000000000000000000000000000000000000000041
Arg [12] : 697066733a2f2f516d4e56427062704232416d4433706a704c64506234797952
Arg [13] : 6a6f4338626e47554a78357a5a575a41354c4d574c2f48696464656e2e6a736f
Arg [14] : 6e00000000000000000000000000000000000000000000000000000000000000


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Swarm Source

ipfs://23e6c12c4224b59bd0a93753b7e07333505cd8373724852b61343450d848de11
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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