Contract 0x895a6f444be4ba9d124f61df736605792b35d66b

 

Contract Overview

Balance:
63.543571826906789976 ETH

ETH Value:
$77,296.94 (@ $1,216.44/ETH)
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x6ba6c2805814a9fdd6feb59a06155f04d315d53b823826ace956935d8e6ff02fMint410682972022-11-25 10:50:262 days 5 hrs ago0x81ccc9b9deb1c4c4c2e386fa372112b1b3488e2a IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0715 ETH0.00002941
0xd3fa70d212e3ec3004afc5e05c9e0ecdf22fb444368752d7111e71ac187af4e6Mint401163262022-11-22 2:34:565 days 13 hrs ago0x4e51a06e4643197e1be2f050b6af60f9ad3cef06 IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0715 ETH0.00002981
0xc9ba061d0de36d7ae71ae33346ba35f7c6e9e728102b215fdaa9c2986074485fSet Approval For...401128242022-11-22 2:15:245 days 13 hrs ago0x8791c9057566af6f55f18fdbea4465e1b1ee2f8e IN  0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH0.00001879
0xbe359246a06ecab0f3f143e5f2c46870faf5427645d6a1bf996ca82f08e5ee42Mint400545402022-11-21 20:51:585 days 19 hrs ago0xed9a912182745fe101ecb4291d00b802d982ba0f IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0714 ETH0.00003381
0xf18576aef309670ba5f913dddad4aaff4a6fe01e14b5168ba1e474ec3e31629cSet Approval For...396797752022-11-20 16:05:397 days 5 mins ago0xe10cd9b7ba4fe128245ba03746946a2a4da315d4 IN  0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH0.00002171
0x5b6057afc6686da367361145f624d187e147f8caf7e6cac8f64fdfff506f0a73Mint394824572022-11-20 1:27:467 days 14 hrs ago0x81ccc9b9deb1c4c4c2e386fa372112b1b3488e2a IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0713 ETH0.00002984
0x520c55277b6e7c9fa49f637e597293b4dc1b6b64bbf835e0f1e674a821e7c2f9Mint393566592022-11-19 15:33:258 days 38 mins ago0xcd69bcd0ee9de0e349881e245eb3e01a30199289 IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0712 ETH0.00003649
0x8e7538053b3494ccf8ab5cf0ab16f5bd60b1852a7b9a12ef91f0f58b23a643c8Mint387181382022-11-17 4:36:2010 days 11 hrs ago0x81ccc9b9deb1c4c4c2e386fa372112b1b3488e2a IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0711 ETH0.00003181
0x30d14ecb633e7590635199e4b01779e2e32e183747c3bd9f1d9f5c3bfc24cf8fMint371612292022-11-11 8:51:0916 days 7 hrs ago0x51ea8b46cb7c78fc5ebf0413b1f35d4b450e938a IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0711 ETH0.00003256
0x5c0e3dc0e8d8f7d0bee3e80f90d6462b60c127b03fd3678691515974e9c0e24bSet Approval For...369384872022-11-10 14:22:2117 days 1 hr ago0x4f1238728b6a046158b473a508f1da0847ba61f0 IN  0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH0.00005994
0x6fbdebcf3fc37fe3f4cd88efb55a678e43df1909e89ab3e18de97d01b6f4e922Set Approval For...366907102022-11-09 18:21:3517 days 21 hrs ago0xb630abd9a5367763b7cba316e870c4a54064cc9f IN  0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH0.00006922
0xfc8ce46d3d7a61385198e21c007d84ba3a7d900eb010033af8f80557580f2802Mint366364762022-11-09 14:18:3918 days 1 hr ago0x3ba5b492e2aac328f10d753350ac8ecffbe2294a IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.071 ETH0.00004412
0x3c89ecfd489837831ba56a49b2b9256f31439cef404ccb675d581566d5c48cc9Mint362761532022-11-08 10:17:4519 days 5 hrs ago0xd48b17b111579360d1465ccc470144967505c053 IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0709 ETH0.00003307
0xae5e7e18ef7bff34bf1052d7e374f5e5fe0e3ac506e4b5159ae90f975af6546eMint357066482022-11-06 11:25:3121 days 4 hrs ago0x81ccc9b9deb1c4c4c2e386fa372112b1b3488e2a IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0708 ETH0.00002892
0x7fe229533ffc657d631dc6c032c393efd11eeb3a1039638ee7b45a63a91538cbMint355294392022-11-05 18:19:1921 days 21 hrs ago0x85140917c4aba6627a824a252426cf25a6d338ad IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0707 ETH0.0000312
0x3fe603b72d62dee396b10145b2e15cd1fedcd8c050bc1ca1bffa5ed25ea361b5Mint352635342022-11-04 18:43:4822 days 21 hrs ago0x81ccc9b9deb1c4c4c2e386fa372112b1b3488e2a IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0707 ETH0.00004196
0x2567ea40446e21f32482e3fb6de03e33cd233d663db3e5fe12f454cf87646ce0Mint351160202022-11-04 4:33:5123 days 11 hrs ago0x85140917c4aba6627a824a252426cf25a6d338ad IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0705 ETH0.00003373
0x38fea1fdf1acf75a8d913609a2f7c9c9ec1ef297cb26d3b26bb9a845335cfc32Mint350942152022-11-04 2:15:5723 days 13 hrs ago0x81ccc9b9deb1c4c4c2e386fa372112b1b3488e2a IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0704 ETH0.0000313
0x9f5d8707ba1f41e34177fce16e8659d45aad33332edd414850ee3401dcbe05f5Mint350797932022-11-04 0:38:1823 days 15 hrs ago0x81ccc9b9deb1c4c4c2e386fa372112b1b3488e2a IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0704 ETH0.00003312
0x99eda83ed94757ebb2217693f7c7b5961754be12e8586af4296e8fde5adfd895Mint350797392022-11-04 0:37:5423 days 15 hrs ago0x81ccc9b9deb1c4c4c2e386fa372112b1b3488e2a IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0703 ETH0.00003312
0xdf080c301ede9639e9049afa5d5ac125e1575e4be3af601d97f6a5c48dda53f7Mint349230842022-11-03 9:23:5624 days 6 hrs ago0x81ccc9b9deb1c4c4c2e386fa372112b1b3488e2a IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0702 ETH0.00004815
0xfff2109731b25c30c4ab2e12e9fd03993948d182e4d7a7e4d7091190dbd5a63aMint348671182022-11-03 4:21:0824 days 11 hrs ago0x85140917c4aba6627a824a252426cf25a6d338ad IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0701 ETH0.00003326
0xa9f9d04b614007f929b77c7de1ffc1b089f161f3e3359acddfb680d27c1d900bMint348146162022-11-02 22:59:0124 days 17 hrs ago0x85140917c4aba6627a824a252426cf25a6d338ad IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0701 ETH0.00003803
0x3523db04062fbdaac0de2d6694f3a0914368d0e71555fa295124d8069065e0cfMint347500852022-11-02 17:00:3924 days 23 hrs ago0x81ccc9b9deb1c4c4c2e386fa372112b1b3488e2a IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.07 ETH0.00005105
0x34a2b393e23bc72654154c6e6d034b12e17b1291c9bab4fb80ab38d62830e408Mint347120962022-11-02 13:50:4825 days 2 hrs ago0xf1a67d67cc97e9755e2c8b13a6ee3e538bf830d9 IN  0x895a6f444be4ba9d124f61df736605792b35d66b0.0699 ETH0.00002967
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Latest 25 internal transaction
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0x6ba6c2805814a9fdd6feb59a06155f04d315d53b823826ace956935d8e6ff02f410682972022-11-25 10:50:262 days 5 hrs ago 0x895a6f444be4ba9d124f61df736605792b35d66b0x81ccc9b9deb1c4c4c2e386fa372112b1b3488e2a0.000678874228752859 ETH
0x1bfdb989199ee20cb2d1ddfd321c6f2291cf6dec8c88a20c8b4159b94c9d7a88405628302022-11-23 13:58:384 days 2 hrs ago 0x47ef85dfb775ace0934fba9eed09d22e6ec0cc08 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0xa041f9e360a1f94c26d56344e02ef49eee755ea639f160fb9aa28dcd178e5f18403462472022-11-22 20:02:114 days 20 hrs ago 0x895a6f444be4ba9d124f61df736605792b35d66b 0x47ef85dfb775ace0934fba9eed09d22e6ec0cc080 ETH
0xa041f9e360a1f94c26d56344e02ef49eee755ea639f160fb9aa28dcd178e5f18403462472022-11-22 20:02:114 days 20 hrs ago 0x47ef85dfb775ace0934fba9eed09d22e6ec0cc08 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x2d6f3812fda3b7d4953315ee1be906e701d55305a20a6866b202c54b8aec0672403459882022-11-22 20:00:574 days 20 hrs ago 0x47ef85dfb775ace0934fba9eed09d22e6ec0cc08 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x13d1c585b65db4cb2d0232fad479c7e0fb9b88b60f1b288df791ce0fc5e0291e401540112022-11-22 5:52:365 days 10 hrs ago 0x47ef85dfb775ace0934fba9eed09d22e6ec0cc08 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0xd3fa70d212e3ec3004afc5e05c9e0ecdf22fb444368752d7111e71ac187af4e6401163262022-11-22 2:34:565 days 13 hrs ago 0x895a6f444be4ba9d124f61df736605792b35d66b0x4e51a06e4643197e1be2f050b6af60f9ad3cef060.00075669186769839 ETH
0x239a9bbe5a5092b00a988cc3ee050d61bea0aec86826e502426d447949305cb5401125662022-11-22 2:13:565 days 13 hrs ago 0x2069cb988d5b17bab70d73076d6f1a9757a4f963 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x239a9bbe5a5092b00a988cc3ee050d61bea0aec86826e502426d447949305cb5401125662022-11-22 2:13:565 days 13 hrs ago 0x2069cb988d5b17bab70d73076d6f1a9757a4f963 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x239a9bbe5a5092b00a988cc3ee050d61bea0aec86826e502426d447949305cb5401125662022-11-22 2:13:565 days 13 hrs ago 0x2069cb988d5b17bab70d73076d6f1a9757a4f963 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x239a9bbe5a5092b00a988cc3ee050d61bea0aec86826e502426d447949305cb5401125662022-11-22 2:13:565 days 13 hrs ago 0x2069cb988d5b17bab70d73076d6f1a9757a4f963 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x239a9bbe5a5092b00a988cc3ee050d61bea0aec86826e502426d447949305cb5401125662022-11-22 2:13:565 days 13 hrs ago 0x2069cb988d5b17bab70d73076d6f1a9757a4f963 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x239a9bbe5a5092b00a988cc3ee050d61bea0aec86826e502426d447949305cb5401125662022-11-22 2:13:565 days 13 hrs ago 0x2069cb988d5b17bab70d73076d6f1a9757a4f963 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x239a9bbe5a5092b00a988cc3ee050d61bea0aec86826e502426d447949305cb5401125662022-11-22 2:13:565 days 13 hrs ago 0x2069cb988d5b17bab70d73076d6f1a9757a4f963 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x239a9bbe5a5092b00a988cc3ee050d61bea0aec86826e502426d447949305cb5401125662022-11-22 2:13:565 days 13 hrs ago 0x2069cb988d5b17bab70d73076d6f1a9757a4f963 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x239a9bbe5a5092b00a988cc3ee050d61bea0aec86826e502426d447949305cb5401125662022-11-22 2:13:565 days 13 hrs ago 0x2069cb988d5b17bab70d73076d6f1a9757a4f963 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x239a9bbe5a5092b00a988cc3ee050d61bea0aec86826e502426d447949305cb5401125662022-11-22 2:13:565 days 13 hrs ago 0x2069cb988d5b17bab70d73076d6f1a9757a4f963 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x239a9bbe5a5092b00a988cc3ee050d61bea0aec86826e502426d447949305cb5401125662022-11-22 2:13:565 days 13 hrs ago 0x2069cb988d5b17bab70d73076d6f1a9757a4f963 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x239a9bbe5a5092b00a988cc3ee050d61bea0aec86826e502426d447949305cb5401125662022-11-22 2:13:565 days 13 hrs ago 0x2069cb988d5b17bab70d73076d6f1a9757a4f963 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0xbe359246a06ecab0f3f143e5f2c46870faf5427645d6a1bf996ca82f08e5ee42400545402022-11-21 20:51:585 days 19 hrs ago 0x895a6f444be4ba9d124f61df736605792b35d66b0xed9a912182745fe101ecb4291d00b802d982ba0f0.000734424001296963 ETH
0x1b63769e4b0b78ac5907d6b4dce6ac36192300cb3238472cb6fff4e73bc43d19399791832022-11-21 15:12:336 days 58 mins ago 0x47ef85dfb775ace0934fba9eed09d22e6ec0cc08 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x2b3c6eb770ff29cf7fbf73f44d2dfb61309cc4552cee394500ac76a2fc9d63f4399791522022-11-21 15:12:246 days 59 mins ago 0x47ef85dfb775ace0934fba9eed09d22e6ec0cc08 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x66edd200cf84d921044307a505cc913cbee9f42e68812c53387d15d32395c6c1399791082022-11-21 15:12:126 days 59 mins ago 0x47ef85dfb775ace0934fba9eed09d22e6ec0cc08 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x64cb0c81e2cf1f75ddf006166b594f1f63607b6ed94d4137036634ebdbd05d46398867512022-11-21 8:39:026 days 7 hrs ago 0x2069cb988d5b17bab70d73076d6f1a9757a4f963 0x895a6f444be4ba9d124f61df736605792b35d66b0 ETH
0x99ab041920928cff2ddbb8c2ca501192691a22725d217eafa7f242f1e4ffff86398063892022-11-21 2:23:266 days 13 hrs ago 0x895a6f444be4ba9d124f61df736605792b35d66b 0x47ef85dfb775ace0934fba9eed09d22e6ec0cc080 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
RandomWalkNFT

Compiler Version
v0.8.9+commit.e5eed63a

Optimization Enabled:
Yes with 20000 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 13 : randomWalkNFT.sol
// SPDX-License-Identifier: MIT

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

pragma solidity ^0.8.9;

contract RandomWalkNFT is ERC721Enumerable, Ownable {

    uint256 public saleTime = 1636675200; // November 11 2021 19:00 New York Time
    uint256 public price = 10**15; // Price starts at .001 eth

    // How long to wait until the last minter can withdraw
    uint256 public withdrawalWaitSeconds = 3600 * 24 * 30; // 1 month

    // Seeds
    mapping(uint256 => bytes32) public seeds;

    mapping(uint256 => string) public tokenNames;

    uint256 public numWithdrawals = 0;
    mapping(uint256 => uint256) public withdrawalNums;
    mapping(uint256 => uint256) public withdrawalAmounts;

    // Entropy
    bytes32 public entropy;

    address public lastMinter = address(0);
    uint256 public lastMintTime = saleTime;
    uint256 public nextTokenId = 0;

    string private _baseTokenURI;

    event TokenNameEvent(uint256 tokenId, string newName);
    event MintEvent(uint256 indexed tokenId, address indexed owner, bytes32 seed, uint256 price);
    event WithdrawalEvent(uint256 indexed tokenId, address destination, uint256 amount);

    // IPFS link to the Python script that generates images and videos for each NFT based on seed.
    string public tokenGenerationScript = "ipfs://QmP7Z8VbQLpytzXnceeAAc4D5tX39XVzoEeUZwEK8aPk8W";

    constructor() ERC721("RandomWalkNFT", "RWLK") {
        entropy = keccak256(abi.encode(
            "A two-dimensional random walk will return to the point where it started, but a three-dimensional one may not.",
            block.timestamp, blockhash(block.number)));
    }

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

    function setTokenName(uint256 tokenId, string memory name) public {
        require(
            _isApprovedOrOwner(_msgSender(), tokenId),
            "setTokenName caller is not owner nor approved"
        );
        require(bytes(name).length <= 32, "Token name is too long.");
        tokenNames[tokenId] = name;
        emit TokenNameEvent(tokenId, name);
    }

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

    function getMintPrice() public view returns (uint256) {
        return (price * 10011) / 10000;
    }

    function timeUntilSale() public view returns (uint256) {
        if (saleTime < block.timestamp) return 0;
        return saleTime - block.timestamp;
    }

    function timeUntilWithdrawal() public view returns (uint256) {
        uint256 withdrawalTime = lastMintTime + withdrawalWaitSeconds;
        if (withdrawalTime < block.timestamp) return 0;
        return withdrawalTime - block.timestamp;
    }

    function withdrawalAmount() public view returns (uint256) {
        return address(this).balance / 2;
    }

    /**
     * If there was no mint for withdrawalWaitSeconds, then the last minter can withdraw
     * half of the balance in the smart contract.
     */
    function withdraw() public {
        require(_msgSender() == lastMinter, "Only last minter can withdraw.");
        require(timeUntilWithdrawal() == 0, "Not enough time has elapsed.");

        address destination = lastMinter;
        // Someone will need to mint again to become the last minter.
        lastMinter = address(0);

        // Token that trigerred the withdrawal
        uint256 tokenId = nextTokenId - 1;
        uint256 amount = withdrawalAmount();

        numWithdrawals += 1;
        withdrawalNums[tokenId] = numWithdrawals;
        withdrawalAmounts[tokenId] = amount;

        // Transfer half of the balance to the last minter.
        (bool success, ) = destination.call{value: amount}("");
        require(success, "Transfer failed.");

        emit WithdrawalEvent(tokenId, destination, amount);
    }

    function mint() public payable {
        uint256 newPrice = getMintPrice();
        require(
            msg.value >= newPrice,
            "The value submitted with this transaction is too low."
        );
        require(
            block.timestamp >= saleTime,
            "The sale is not open yet."
        );

        lastMinter = _msgSender();
        lastMintTime = block.timestamp;

        price = newPrice;
        uint256 tokenId = nextTokenId;
        nextTokenId += 1;

        entropy = keccak256(abi.encode(
            entropy,
            block.timestamp,
            blockhash(block.number),
            tokenId,
            lastMinter));
        seeds[tokenId] = entropy;
        _safeMint(lastMinter, tokenId);

        if (msg.value > price) {
            // Return the extra money to the minter.
            (bool success, ) = lastMinter.call{value: msg.value - price}("");
            require(success, "Transfer failed.");
        }

        emit MintEvent(tokenId, lastMinter, entropy, price);
    }

    // Returns a list of token Ids owned by _owner.
    function walletOfOwner(address _owner)
        public
        view
        returns (uint256[] memory)
    {
        uint256 tokenCount = balanceOf(_owner);

        if (tokenCount == 0) {
            // Return an empty array
            return new uint256[](0);
        }

        uint256[] memory result = new uint256[](tokenCount);
        for (uint256 i; i < tokenCount; i++) {
            result[i] = tokenOfOwnerByIndex(_owner, i);
        }
        return result;
    }

    // Returns a list of seeds owned by _owner.
    function seedsOfOwner(address _owner)
        public
        view
        returns (bytes32[] memory)
    {
        uint256 tokenCount = balanceOf(_owner);

        if (tokenCount == 0) {
            // Return an empty array
            return new bytes32[](0);
        }

        bytes32[] memory result = new bytes32[](tokenCount);
        for (uint256 i; i < tokenCount; i++) {
            uint256 tokenId = tokenOfOwnerByIndex(_owner, i);
            result[i] = seeds[tokenId];
        }
        return result;
    }
}

File 2 of 13 : ERC721.sol
// SPDX-License-Identifier: MIT

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: 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 3 of 13 : ERC721Enumerable.sol
// SPDX-License-Identifier: MIT

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 13 : Ownable.sol
// SPDX-License-Identifier: MIT

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() {
        _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);
    }
}

File 5 of 13 : IERC721.sol
// SPDX-License-Identifier: MIT

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`, 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 6 of 13 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT

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 7 of 13 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT

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 8 of 13 : Address.sol
// SPDX-License-Identifier: MIT

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 9 of 13 : Context.sol
// SPDX-License-Identifier: MIT

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 10 of 13 : Strings.sol
// SPDX-License-Identifier: MIT

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 11 of 13 : ERC165.sol
// SPDX-License-Identifier: MIT

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 12 of 13 : IERC165.sol
// SPDX-License-Identifier: MIT

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 13 of 13 : IERC721Enumerable.sol
// SPDX-License-Identifier: MIT

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 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);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 20000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract ABI

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