Contract 0x99B9791D1580BF504a1709d310923A46237c8f2C

 
Txn Hash
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From
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0x07973e8d0f975b2d4b124f1c0e41ebd8ba2825a55700e3e3062bf40348de7357Set Approval For...152382462022-07-29 15:42:4418 days 16 hrs agoENS Name uyumtu.eth IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00082183 17.‍57228867
0xcbc11452d30a4c333011e8b5757d9c55c0ef48b5c6e3362599ca1fc375be21d8Safe Transfer Fr...152216252022-07-27 1:33:5721 days 6 hrs ago0x76a8375e791f5cda8fb8528cdd92090527fe7af5 IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00054439 6.‍96638947
0x9d59b9ebac0d09fa5d629791a6b6c69d806f20240d3cfd0b96ee95238888136fSafe Transfer Fr...152216202022-07-27 1:33:1721 days 6 hrs ago0x76a8375e791f5cda8fb8528cdd92090527fe7af5 IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00077607 8.‍75923435
0xf705a2a9f1b303705fb8f2d71968fafc3eb0c4614cf9bb1b255ec1a732006e55Set Approval For...151829992022-07-21 1:30:5927 days 6 hrs agoENS Name delistdelist.eth IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00102306 21.‍88055229
0x5fde9c2e16eb4fe9527c2cb7414654a9c0d8c0ae473f9aadcf3aba12e9b42facSet Approval For...151829952022-07-21 1:29:5927 days 6 hrs agoENS Name comfyaf.eth IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00096927 20.‍72994573
0xa77500ce589d080eb3ca54640a17502c31ac0709352f3865d9e754557f380a69Set Approval For...151788462022-07-20 10:04:0327 days 21 hrs agoENS Name primordial33.eth IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00098726 21.‍10931763
0xc63d7c27bb27ef3f3f3978ee93546b10cebaea30aed08e36b0f4eae89c94564aSet Approval For...151788382022-07-20 10:01:2927 days 22 hrs agoENS Name primordial33.eth IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00092759 19.‍86919731
0x65d155034de69fa4d65d26386bd07bfb059eba00e551fcf7be29d78c3cd481b6Set Approval For...151788372022-07-20 10:01:1427 days 22 hrs agoENS Name primordial33.eth IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00086749 18.‍54845833
0x83aa62148001351d41398511bd9c24d948dc20626257d0c8f7ee3bf2a7f1a6ccSet Approval For...151146152022-07-10 11:22:2337 days 20 hrs ago0x75937b727957f4899ee83789294ed9d11d3f6982 IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00041929 8.‍96518036
0x5d867d31a93fc05510ef68050a05e0d4d48e31ad4fed6f86f8e06de873b1ebaaSet Approval For...150455052022-06-29 14:48:1048 days 17 hrs ago0xa08044305a1cc53cc90e445ae72bc18d70eca7d8 IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00156748 33.‍5154936
0xa03f7ad908efc2a5930985325772350e62433c3ec9815a2982cae6ff8adb8d17Set Approval For...149955282022-06-20 8:20:1157 days 23 hrs agoENS Name 0xb2f1.eth IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00103065 22.‍03717504
0x6554bf4c298e253ba94da9f26c588cd153fa8111526b36fed91e91cfa6255236Set Approval For...149447122022-06-11 14:14:5766 days 17 hrs agoENS Name ijackie.eth IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00138266 29.‍56376926
0x8720aab45875d6b47bb2ad0131dc552bb668f996b20f2bdf9d051d5da0ec582fSet Approval For...149403532022-06-10 20:19:2767 days 11 hrs agoENS Name ibrosend.eth IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00222889 47.‍66965625
0x023d5475e4f2e6882d931ebbc6c6e656787c0c74aeff0c95680d3bfcd0b8186bTransfer From149030192022-06-04 11:33:5173 days 20 hrs ago0xe2676c4e714dd8e75d58fda88146292345cf1125 IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00259847 30.‍58035416
0x45f0291585484dbab5d6ef61786efb94915f983e6857fd6013c4f3edaabbbdbdSet Approval For...148909802022-06-02 12:28:4775 days 19 hrs ago0x9bcd41f0fc58d6b18a81baa557110de0231b80cf IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00252734 54.‍03885175
0xd11c75fd88a91a66b89a6f27e6b486426dec3a4bcfc157edcc26e97b0113237aSet Approval For...146854552022-04-30 12:01:17108 days 20 hrs ago0x9a0c5730ddbe34cf636f18fe352f1046243a3481 IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00082892 33.‍34781432
0x3ac8e9d7f350a5f6103173799b67198615360a9d377cf1e603598d8eb845317fSet Approval For...146854482022-04-30 11:58:37108 days 20 hrs ago0x9a0c5730ddbe34cf636f18fe352f1046243a3481 IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00094166 37.‍88317684
0x79d0b8e6a2ce829735fea9e2f3f8e31e53eee9505a344fb58f2cbbdc7348bea8Set Approval For...146269152022-04-21 7:12:28118 days 50 mins ago0xa8bdf47db9062b0a8aa283da4d48d40735079778 IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00093739 37.‍71148931
0x961ccec252365614d590edfad711bd1687d3dc1f99ccf13d8287efabb3a75a51Set Approval For...146130322022-04-19 2:52:52120 days 5 hrs agoENS Name akcli.eth IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00091068 36.‍63708403
0x9bfa495a2bca867d6d8489f51ad615d1d854a2220a40955d277103a68b0b856cSet Approval For...145575312022-04-10 10:50:03128 days 21 hrs agoENS Name kishu.eth IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00079757 17.‍05345091
0x07543c8b478678d22179aaedc7f1cc6d9642585db21ae0737cf30a4c5dd4f25bSet Approval For...144788142022-03-29 3:57:30141 days 4 hrs agoENS Name baker3x.eth IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00086224 34.‍6883355
0x59057dbc6dd09e34a70914974fb4faa21d4b3fba76d654364b58215b2cb78c7eSet Approval For...144777402022-03-28 23:52:56141 days 8 hrs agoENS Name whiskyvault.eth IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00226946 48.‍52499012
0xb4b9c2198d6d2998a276fd373eefaeb1dbc0872d0c99c4039cdbd480d4cd8b08Set Approval For...144280662022-03-21 6:17:13149 days 1 hr ago0xc9f8775d3013e02b831bbabe6815c98fe7c23742 IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00104534 22.‍35119881
0x86396de5d948f466ccc41508241b1da75fc9ccb48cd3d404e43a9575d292eab6Set Approval For...144129262022-03-18 21:47:38151 days 10 hrs agoENS Name bubbletrouble.eth IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍0009517 38.‍28714636
0x6e00d6d02bda3669ed3e4881e50ab642ea15c2d5d4a36b82ac95f073e0b585afSet Approval For...143492862022-03-09 0:09:39161 days 7 hrs agoENS Name akcli.eth IN  0x99b9791d1580bf504a1709d310923a46237c8f2c0 Ether0.‍00168766 36.‍08501888
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0x7b585af67b4921ab7f11d790de2224f0f7ecc892d7816dc358ca8503f739e501131710772021-09-06 8:23:49344 days 23 hrs ago 0x99b9791d1580bf504a1709d310923a46237c8f2c0x742426d09d9a566a651c2c2019087b2819fa426b300 Ether
0xa391e306fb4598d27884f182762e9124dcaf8768cdcdf4f6ea892bfb1fd6f3d6131710362021-09-06 8:14:21344 days 23 hrs ago 0x99b9791d1580bf504a1709d310923a46237c8f2c 0xbb2911e08a0d9543034fa660968353e52fad18ac435 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
MillionDollarRat

Compiler Version
v0.8.3+commit.8d00100c

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
File 1 of 14 : MillionDollarRat.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.3;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/Strings.sol";

contract MillionDollarRat is ERC721Enumerable, Ownable, ReentrancyGuard {
    using Strings for uint256;

    // emitted by {depositGoldenRatToSewer} on success
    event GoldenRatDeposited(address indexed owner, address indexed sewer);

    // This is the provenance record of all artwork in existence
    string public constant RATS_PROVENANCE = "60f27f7b882a5c8f31453d36f99fa1cc67b3c254934e4f327f66059599cf10e0";

    // opens Apr 29 3pm EST | 1619722800
    uint256 public constant SALE_START_TIMESTAMP = 1619722800;

    // The sale lasts for 21 days
    uint256 public constant REVEAL_TIMESTAMP = SALE_START_TIMESTAMP + 3 weeks;

    // Sale price tiers
    uint256 private constant TIER_1_PRICE = 50000000000000000; // 0.05 ETH
    uint256 private constant TIER_2_SUPPLY_THRESHOLD = 51;
    uint256 private constant TIER_2_PRICE = 150000000000000000; // 0.15 ETH
    uint256 private constant TIER_3_SUPPLY_THRESHOLD = 251;
    uint256 private constant TIER_3_PRICE = 180000000000000000; // 0.18 ETH
    uint256 private constant TIER_4_SUPPLY_THRESHOLD = 1251;
    uint256 private constant TIER_4_PRICE = 200000000000000000; // 0.20 ETH
    uint256 private constant TIER_5_SUPPLY_THRESHOLD = 2051;
    uint256 private constant TIER_5_PRICE = 220000000000000000; // 0.22 ETH
    uint256 private constant TIER_6_SUPPLY_THRESHOLD = 2851;
    uint256 private constant TIER_6_PRICE = 400000000000000000; //  0.4 ETH
    uint256 private constant TIER_7_SUPPLY_THRESHOLD = 3251;
    uint256 private constant TIER_7_PRICE = 450000000000000000; // 0.45 ETH
    uint256 private constant TIER_8_SUPPLY_THRESHOLD = 3301;
    uint256 private constant TIER_8_PRICE = 500000000000000000; // 0.5 ETH

    // ETH-USD price at deployment: $2300
    uint256 private constant GOLDEN_RAT_PRIZE = 435 ether;
    uint256 private constant GOLDEN_RAT_THRESHOLD = GOLDEN_RAT_PRIZE + 50 ether;

    uint256 public constant MAX_RAT_SUPPLY = 3311;
    uint256 private constant RAT_PACK_LIMIT = 10;
    uint256 private constant GOLDEN_RAT_TOKEN_ID = 0;
    string private constant PLACEHOLDER_SUFFIX = "placeholder.json";
    string private constant METADATA_INFIX = "/metadata/";

    uint256 public startingIndexBlock;
    uint256 public startingIndex;
    address private _sewer;

    // current metadata base prefix
    string private _baseTokenUri;

    // ===============================================================

    /*
     * @dev MillionDollarRat must be deployed after Sewer, and expects to receive
     *  its address in the constructor.
     */
    constructor(address sewer) ERC721("Million Dollar Rat", "MDRAT") {
        require(sewer != address(0), "Sewer not specified");

        // store Sewer address
        _sewer = sewer;

        // mint the Golden Rat
        _safeMint(address(this), totalSupply());
    }

    /**
     * @dev Returns rat price in the current tier.
     */
    function getRatPrice() public view returns (uint256) {
        require(
            block.timestamp >= SALE_START_TIMESTAMP,
            "Sale has not started"
        );
        require(totalSupply() < MAX_RAT_SUPPLY, "Sale has ended");

        uint256 currentSupply = totalSupply();

        if (currentSupply >= TIER_8_SUPPLY_THRESHOLD) {
            return TIER_8_PRICE;
        } else if (currentSupply >= TIER_7_SUPPLY_THRESHOLD) {
            return TIER_7_PRICE;
        } else if (currentSupply >= TIER_6_SUPPLY_THRESHOLD) {
            return TIER_6_PRICE;
        } else if (currentSupply >= TIER_5_SUPPLY_THRESHOLD) {
            return TIER_5_PRICE;
        } else if (currentSupply >= TIER_4_SUPPLY_THRESHOLD) {
            return TIER_4_PRICE;
        } else if (currentSupply >= TIER_3_SUPPLY_THRESHOLD) {
            return TIER_3_PRICE;
        } else if (currentSupply >= TIER_2_SUPPLY_THRESHOLD) {
            return TIER_2_PRICE;
        } else {
            return TIER_1_PRICE;
        }
    }

    /**
     * @dev Mint `numberOfRats` rats. Price slippage is okay between tiers.
     *  It's a feature.
     *
     *  - Only mints until `MAX_RAT_SUPPLY` is reached.
     *  - Mints up to `RAT_PACK_LIMIT` per request.
     *  - Reverts if minting will exceed MAX_RAT_SUPPLY.
     *
     *  `msg.value` must equal number of rats to be minted multiplied by
     *  the current price.
     */
    function mintRats(uint256 numberOfRats) public payable nonReentrant {
        require(totalSupply() < MAX_RAT_SUPPLY, "Sale has ended");
        require(numberOfRats > 0, "Cannot sell 0 Rats");
        require(numberOfRats <= RAT_PACK_LIMIT, "Buy limit exceeded");
        require(
            (totalSupply() + numberOfRats) <= MAX_RAT_SUPPLY,
            "Exceeds MAX_RAT_SUPPLY"
        );
        require(
            (getRatPrice() * numberOfRats) == msg.value,
            "ETH sent is not correct"
        );

        for (uint256 i = 0; i < numberOfRats; i++) {
            _safeMint(msg.sender, totalSupply());
        }

        /**
         * Source of "randomness". Theoretically miners could influence this but
         * not worried for the scope of this project
         */
        /**
         * [Stuck]
         * If not all rats have been minted, block.timestamp > REVEAL_TIMESTAMP,
         * and no one is calling {mintRats} past that point, the code below is not
         * executed, and thus startingIndexBlock is not set. We fix that in {reveal}.
         */
        if (
            startingIndexBlock == 0 &&
            (totalSupply() == MAX_RAT_SUPPLY ||
                block.timestamp >= REVEAL_TIMESTAMP)
        ) {
            startingIndexBlock = block.number;
        }
    }

    /**
     * @dev Call after the sale ends or when reveal period begins. This sets
     *  `startingIndex` for rats.
     */
    function reveal() public {
        require(startingIndex == 0, "Starting index is already set");
        require(
            block.timestamp >= REVEAL_TIMESTAMP ||
                totalSupply() == MAX_RAT_SUPPLY,
            "Before reveal OR full drop"
        );

        // account for the [Stuck] scenario, see {mintRats}
        if (startingIndexBlock == 0) {
            startingIndexBlock = block.number;
        }

        uint256 _start =
            uint256(blockhash(startingIndexBlock)) % MAX_RAT_SUPPLY;

        if (
            (_start > block.number)
                ? ((_start - block.number) > 255)
                : ((block.number - _start) > 255)
        ) {
            _start = uint256(blockhash(block.number - 1)) % MAX_RAT_SUPPLY;
        }

        if (_start == 0) {
            _start = _start + 1;
        }

        startingIndex = _start;
    }

    /*
     * @dev Award Golden Rat (tokenId = 0) to the owner of `tokenId`.
     *  Only callable after {reveal} has been explicitly called.
     *
     *  Reverts if `tokenId` has not been minted.
     *  Prevents duplicate transfer.
     *  Reverts if transfer is to contract owner or contract address.
     */
    function awardGoldenRat(uint256 tokenId) public onlyOwner nonReentrant {
        require(startingIndex > 0, "Golden Rat not yet revealed");
        require(_exists(tokenId), "Unknown winner rat, tokenId");
        require(
            ownerOf(GOLDEN_RAT_TOKEN_ID) == address(this),
            "Already awarded"
        );
        require(
            (ownerOf(tokenId) != owner()) &&
                (ownerOf(tokenId) != address(this)) &&
                (tokenId > 0),
            "Cannot award to self"
        );
        require(
            address(this).balance >= GOLDEN_RAT_THRESHOLD,
            "Prize threshold not reached"
        );

        _safeTransfer(
            ownerOf(GOLDEN_RAT_TOKEN_ID),
            ownerOf(tokenId),
            GOLDEN_RAT_TOKEN_ID,
            ""
        );

        //payable(_sewer).transfer(GOLDEN_RAT_PRIZE);
        (bool sent, ) = payable(_sewer).call{value: GOLDEN_RAT_PRIZE}("");

        require(sent, "ETH Transfer Failed");
    }

    /**
     * @dev Withdraw owner's ETH from this contract. This is only
     *  callable after {reveal} has been explicitly called.
     */
    function withdraw(uint256 amount) public onlyOwner nonReentrant {
        require(startingIndex > 0, "Golden Rat not yet revealed");

        require(
            !_exists(GOLDEN_RAT_TOKEN_ID) ||
                ownerOf(GOLDEN_RAT_TOKEN_ID) != address(this),
            "Award Golden Rat first"
        );

        require(
            (amount > 0) && (amount <= address(this).balance),
            "Invalid amount"
        );

        //payable(msg.sender).transfer(amount);
        (bool sent, ) = payable(msg.sender).call{value: amount}("");

        require(sent, "ETH Transfer Failed");
    }

    /*
     * @dev After the Golden Rat has been awarded, the owner can send it to
     *  the Sewer contract by calling this.
     */
    function depositGoldenRatToSewer() public {
        require(msg.sender != owner(), "Owner not allowed to do that");
        require(msg.sender != address(this), "Contract not allowed to do that");

        require(
            ownerOf(GOLDEN_RAT_TOKEN_ID) == msg.sender,
            "Not the owner of Golden Rat"
        );

        safeTransferFrom(msg.sender, _sewer, GOLDEN_RAT_TOKEN_ID);

        _burn(GOLDEN_RAT_TOKEN_ID);

        emit GoldenRatDeposited(msg.sender, _sewer);
    }

    // no trailing slash, please
    function setTokenURI(string memory newUri) public onlyOwner {
        _baseTokenUri = newUri;
    }

    function placeholderURI() internal view returns (string memory) {
        return
            string(
                abi.encodePacked(
                    _baseTokenUri,
                    METADATA_INFIX,
                    PLACEHOLDER_SUFFIX
                )
            );
    }

    function indexedTokenURI(uint256 tokenId)
        internal
        view
        returns (string memory)
    {
        return
            string(
                abi.encodePacked(
                    _baseTokenUri,
                    METADATA_INFIX,
                    tokenId.toString(),
                    ".json"
                )
            );
    }

    function ratTokenURI() public view returns (string memory) {
        require(startingIndex > 0, "Before reveal");
        require(msg.sender == _sewer, "And you are?");

        return
            string(abi.encodePacked(_baseTokenUri, METADATA_INFIX, "0.json"));
    }

    /**
     * @dev Golden Rat is minted first, and its tokenId is 0. The URI for the
     *   Golden Rat always points to 0.json.  Before reveal this function returns
     *   placeholder URI for all tokens; after the reveal it returns adjusted
     *   URIs based on `startingIndex` transform for all tokens except Golden Rat.
     */
    function tokenURI(uint256 tokenId)
        public
        view
        virtual
        override
        returns (string memory)
    {
        require(_exists(tokenId), "Unknown tokenId");

        string memory result;

        if (startingIndex > 0) {
            uint256 mappedTokenId =
                (tokenId == GOLDEN_RAT_TOKEN_ID)
                    ? GOLDEN_RAT_TOKEN_ID
                    : ((tokenId + startingIndex) >= MAX_RAT_SUPPLY)
                    ? ((tokenId + startingIndex) % MAX_RAT_SUPPLY) + 1
                    : (tokenId + startingIndex) % MAX_RAT_SUPPLY;

            result = indexedTokenURI(mappedTokenId);
        } else {
            result = placeholderURI();
        }

        return result;
    }
}

File 2 of 14 : 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 () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

File 3 of 14 : 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 14 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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

File 5 of 14 : Strings.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant alphabet = "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] = alphabet[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

}

File 6 of 14 : 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) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

File 7 of 14 : ERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "./extensions/IERC721Enumerable.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}. 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 || ERC721.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 || ERC721.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(to).onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    // solhint-disable-next-line no-inline-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` 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 { }
}

File 8 of 14 : 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);
}

File 9 of 14 : 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 10 of 14 : 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 11 of 14 : 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 12 of 14 : 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;
        // solhint-disable-next-line no-inline-assembly
        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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 13 of 14 : 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 14 of 14 : 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);
}

Settings
{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

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

000000000000000000000000bb2911e08a0d9543034fa660968353e52fad18ac

-----Decoded View---------------
Arg [0] : sewer (address): 0xbb2911e08a0d9543034fa660968353e52fad18ac

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000bb2911e08a0d9543034fa660968353e52fad18ac


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