Contract 0x86C10D10ECa1Fca9DAF87a279ABCcabe0063F247 7

Token Contract 
 
 
Txn Hash
Method
Block
From
To
Value
0x5cb985c590aae0f4db58a88eb7eabf12642b24ed009ac3c8f691860d9cd018b8Safe Transfer Fr...161508682022-12-10 0:57:351 hr 45 mins ago0x3b3ac88fdfd33d8eb95d62d884ac552e46894887 IN  Cool Pets: PETS Token0 Ether0.0008797 14.51075523
0xc2d598fab2b86f75e43de4d47e8196f53fe613fd4969478023472c4811209841Set Approval For...161502992022-12-09 23:03:233 hrs 39 mins ago0xadfa1f34834037c203bf8be4e948e56460d0945e IN  Cool Pets: PETS Token0 Ether0.00072212 15.60636551
0x6b6de11cad26e3370e443cf5c8f167ae34ef549b57c840fe873cf77f11174e73Set Approval For...161502522022-12-09 22:53:473 hrs 49 mins ago0x929e85730bc34ec9d5569f105829df0b300a0059 IN  Cool Pets: PETS Token0 Ether0.00068749 14.8849715
0x95ebef3880ab5a82eb9d0c2e6bcc36566c137609693524b883e5c6ba2a3ae798Set Approval For...161501372022-12-09 22:30:234 hrs 12 mins ago0xf4bcf3962d91dd549538f76648d0234929b2d0a8 IN  Cool Pets: PETS Token0 Ether0.00075521 16.35124292
0x5593f6946ab269d5685d2bacbf95d3ef49592ca2502a9766c0121c757f0024d1Set Approval For...161494042022-12-09 20:03:116 hrs 39 mins agoENS Name plexie.eth IN  Cool Pets: PETS Token0 Ether0.00738608 159.91697333
0xdb28a3db69207866cf302a59710d0030a47d37f62a85b09e190a1dc0b05809cdSet Approval For...161477912022-12-09 14:39:1112 hrs 3 mins ago0x8c0907dfe98747573570d5e25b9e9059dda6f33a IN  Cool Pets: PETS Token0 Ether0.0015241733
0xcda515f979d60a6911bd69286c289f5fcb6eebf05c399102776cebfecaa88729Set Approval For...161477832022-12-09 14:37:3512 hrs 5 mins ago0xea02975ac761a8fe34d3a8b29ecdaa7cbf766c61 IN  Cool Pets: PETS Token0 Ether0.00098248 21.27191769
0x133a68bd9467fb612201aca510bf4910c240bd68ca808e0064c2dc26f58771bcSet Approval For...161473722022-12-09 13:14:5913 hrs 28 mins ago0xbcba66a96b330be24133fa768d94eb4deb8cfc3b IN  Cool Pets: PETS Token0 Ether0.00080835 17.49267693
0x71e9acc18f34a4e539e5bec282baeb2a99d06bacb2f9ff8ae82b3dff38218c2aSet Approval For...161470322022-12-09 12:06:1114 hrs 36 mins ago0x34c2e5e66ffc1eaf7563ad30fd03e45d98546810 IN  Cool Pets: PETS Token0 Ether0.00084773 18.35443795
0x99f485f3e6913ac2172c146968d86aaed6fa5a7004e7709c30cb9fb1b8854b88Set Approval For...161467862022-12-09 11:16:3515 hrs 26 mins agoENS Name woodbro.eth IN  Cool Pets: PETS Token0 Ether0.00060043 13
0x5c155a18ffacdd13770f921c1492a780df548054ae7db8f3e38f836f80143b4eSet Approval For...161467862022-12-09 11:16:3515 hrs 26 mins agoENS Name woodbro.eth IN  Cool Pets: PETS Token0 Ether0.00060074 13
0x30e9f99b894f7fd422085b247da030770d7d39a73e8bf733a152b88da45d4460Set Approval For...161456482022-12-09 7:25:2319 hrs 17 mins agoENS Name *mitchξll.eth IN  Cool Pets: PETS Token0 Ether0.0014232 30.79789881
0x46143c68401709b720d208a1cd99ca4e54cb840cdfaafefaf874918c1fb27846Set Approval For...161451142022-12-09 5:37:5921 hrs 5 mins agoENS Name *eth🌙🚀.eth IN  Cool Pets: PETS Token0 Ether0.00062627 13.55243257
0x7ee87ce310b28205e03c2a6f7c4b7e4c3d19d8ede652b70fa86603784810226bSafe Transfer Fr...161444312022-12-09 3:20:5923 hrs 22 mins agoENS Name mefren.eth IN  Cool Pets: PETS Token0 Ether0.00088219 14.55198593
0xe31cfa8d8fb44117d081fb599d689cb9cf7c81c1acd9fe7ab371c45d16073c67Set Approval For...161443202022-12-09 2:58:3523 hrs 44 mins ago0x9030d862d88a3dfb05af66f2acde29419e305d6a IN  Cool Pets: PETS Token0 Ether0.00065278 14.13341544
0x18312a7cc029e61071eb9fe3740320a9ee74a3f23e437281313bb9f93d724ec8Set Approval For...161441322022-12-09 2:20:471 day 22 mins ago0xa83f6bec55a100ca3402245fc1d46127889354ec IN  Cool Pets: PETS Token0 Ether0.00054915 11.86830898
0xf8bee386fab5311cbb2c2625103ffc3b448d0ae4f9118b7faf70a20aad4e6865Set Approval For...161436192022-12-09 0:37:471 day 2 hrs agoENS Name jgao.eth IN  Cool Pets: PETS Token0 Ether0.00070719 15.30366449
0x6ac8801529c51f8938d50a149ba67b69d9cffc0fd46cbb5a440d882aaa9ff57aSet Approval For...161430522022-12-08 22:43:471 day 3 hrs ago0x5af5d005f956e448dab7f00430e6f6d6ea45209c IN  Cool Pets: PETS Token0 Ether0.0006259 13.55146949
0x67c2f6fba1d75fc89c5b765464cafd64b779df3260aab4ee6d7a5e68daa19f08Set Approval For...161428222022-12-08 21:57:351 day 4 hrs ago0x265ccbb7e74a2dfa052679153d6a630be41a9a12 IN  Cool Pets: PETS Token0 Ether0.0007059 15.28362834
0xcf7370fda3db93232ebd5e790fa9496ef933600c1f8182483e1ba9332301d9b0Transfer From161426272022-12-08 21:18:231 day 5 hrs ago0xf6aafb44bc183d3083bfae12d743d947ca376562 IN  Cool Pets: PETS Token0 Ether0.0007229212.53814888
0xc1c0d11bb133c34faed76afe3706267a884b4ae0d2ad44be153827a84b28737fTransfer From161426272022-12-08 21:18:231 day 5 hrs ago0xf6aafb44bc183d3083bfae12d743d947ca376562 IN  Cool Pets: PETS Token0 Ether0.0008771614.04413397
0x0c5dbec4f1d3615d68d8f1909b0f6264e32f8a8ad3575f3314243e56b7e46269Transfer From161426272022-12-08 21:18:231 day 5 hrs ago0xf6aafb44bc183d3083bfae12d743d947ca376562 IN  Cool Pets: PETS Token0 Ether0.0007803312.49370742
0x1fe268534e0157b89307b1038a39aa6a8c98286320e80f7e87ecea38fb548aecTransfer From161425882022-12-08 21:10:351 day 5 hrs ago0xf6aafb44bc183d3083bfae12d743d947ca376562 IN  Cool Pets: PETS Token0 Ether0.0008324513.32817445
0x3ce263f4700fab1c9013b03c23b1dff4326a0e52e6923c322b07c774cff2f571Transfer From161425822022-12-08 21:09:231 day 5 hrs ago0xf6aafb44bc183d3083bfae12d743d947ca376562 IN  Cool Pets: PETS Token0 Ether0.0007691512.31468086
0x0958501942e299de1b433920bd04714e84eb1106abb2a8350de859d8e143abddTransfer From161425682022-12-08 21:06:351 day 5 hrs ago0xf6aafb44bc183d3083bfae12d743d947ca376562 IN  Cool Pets: PETS Token0 Ether0.000858413.74635105
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OVERVIEW

An NFT offering from the Cool Cats brand, Pets is a collection of 19,999 NFTs that are procedurally generated based on item interaction. All Pets start as an Egg and evolve into their final form, which represents one of four elements: Grass, Fire, Water, or Air.

Latest 9 internal transactions
Parent Txn Hash Block From To Value
0x84a0385168695ded548fb30dae7a56f5de7fe6db5feb535fb9ac1dd0cf68f873141796442022-02-10 17:29:25302 days 9 hrs ago Cool Pets: PETS TokenCool Pets: Deployer1,146.5 Ether
0x1f0c4c1cb50df173fdf75017deff414ba5038a92ab71709169440286233ea3e0141723222022-02-09 14:01:24303 days 12 hrs ago Cool Pets: PETS TokenCool Pets: Deployer113 Ether
0xa52ec94eefaed076a269a7d3cee4f3e0f080bce168c3c2a8e6d6adad0f1b269e141663652022-02-08 15:56:52304 days 10 hrs ago Cool Pets: PETS TokenCool Pets: Deployer496.5 Ether
0xe65fb8431e53e014d8f81efe0119a61e05e82ec53a73fd8b468ceac7d496b87c141619342022-02-07 23:26:27305 days 3 hrs ago Cool Pets: PETS TokenCool Pets: Deployer337 Ether
0xd38dfba7b64ecdd392cc32f5826682e625c582b74181480a3960afa9c8fc930b141609572022-02-07 19:55:49305 days 6 hrs ago Cool Pets: PETS TokenCool Pets: Deployer312 Ether
0xc11e653d31db18f8bbb69ac7c0603b0d4eded7465e7615ebebed68cc13027509141602232022-02-07 17:15:33305 days 9 hrs ago Cool Pets: PETS TokenCool Pets: Deployer678.5 Ether
0x2369f87bc5c8e0cb4963bfaf5cef248b101ffa3f353c67c130147dbbc2bf0f45141595422022-02-07 14:47:34305 days 11 hrs ago Cool Pets: PETS TokenCool Pets: Deployer785 Ether
0xe3388ec7aeab158f496f07c622632d6c8f1f7397a4189b166824947594f3f611141591592022-02-07 13:22:12305 days 13 hrs ago Cool Pets: PETS TokenCool Pets: Deployer1,010.5 Ether
0x4d02a446de68a48dbcfe629a1bd15f5fbcdf176b7961ee6432f9c6efac277188141590672022-02-07 13:02:18305 days 13 hrs ago Cool Pets: PETS TokenCool Pets: Deployer71 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
CoolPets

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 13 : CoolPets.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";

interface ICoolCats {
  function ownerOf(uint256 tokenId) external returns (address);
}

//..............................................................................
//..............................................................................
//..............................................................................
//......................................&&&&&&&.................................
//...................................&&****&&***&&&&............................
//..................................&****&....&&***&&...........................
//.................................&&***&&......&&&.............................
//..........................&&&&****&****&*******%&&&...........................
//......................&&*****************************&&.......................
//....................&&*********************************&&.....................
//..................&&***&&&&&***********&&&&&&************&....................
//.................&&**&      &&*******&&      .&**********&&...................
//.................&&*&&   &&  &&*****&&  &&    &&**********&...................
//.................&&*&&      &&*******&&      &&**********&&...................
//..................&&***&&&&***&&&&*&&***&&&&***********(&&....................
//...................&&&*******************************(%&......................
//..................&&&&#*********************************&&&...................
//...............&&&**&&**************************************&&................
//.............&&****&&***********&&****************&&**&******&&...............
//............&&**&&&&***********&&(&&*************/(((&&*******&...............
//...........&&***&&&&((********&%((((&***********(((((&********&&..............
//...........&*&&&&&&&*********&&(((((&&*************&&*******&& &..............
//...........&**&*& &&(*********&&(((&&*************&&****&&& &&&&**#&..........
//............&&&&...&&*****************************&**&& &&********&&..........
//.....................&&&******************************&&******/&&&&...........
//........................&&*******&&%/***************&&&&&&&& &.&&&............
//.........................&&******&&.......&&*******&&.........................
//...........................&&&&&&...........&&&&&&&...........................
//..............................................................................
//..............................................................................
// ........................ [ In memory of Duhtred  ] ..........................
// .............................................................................
contract CoolPets is ERC721, Ownable {
  using ECDSA for bytes32;

  // Addresses
  address public _ccAddress;
  address public _w1 = 0x1fFa3371A45C22B1284fE5a251eD64F40580a1E3;
  address public _systemAddress = address(0);

  // Token mint values
  uint256 public constant MAX_PET_ID = 19999;
  // Track minting outside of Cool Cat ids.
  uint256 public _currentPetId = 9999;
  // for giveaways, staff and partnerships
  uint256 public _reserved = 100;

  bytes32 public _merkleRoot = 0x0;
  uint256 public _price = 0.5 ether;

  bool public _claimsPaused = true;
  bool public _merkleLocked = false;
  string public _baseTokenURI;

  // For bit manipulation
  uint256[] _allowListTicketSlots;

  // Handle public mint access
  enum EPublicMintStatus {
    CLOSED,
    RESERVED_MINT,
    ALLOW_LIST,
    OPEN
  }
  EPublicMintStatus public _publicMintStatus;

  // Tracks if address has minted
  mapping(address => bool) public _minted;

  // Genetics: petId => genetics
  mapping(uint256 => bytes32) public _petGenetics;

  constructor(string memory baseURI, address ccContractAddress) ERC721("Cool Pets", "PETS") {
    _baseTokenURI = baseURI;
    _ccAddress = ccContractAddress;
  }

  /// @notice Adopt via public minting
  /// @dev Id tracking starts at 9999 to prevent id contamination
  /// @dev Signature to help avoid bot minting
  /// @param salt Some simple salting for the signature
  /// @param signature Verify that this transaction came from the desired location
  function publicAdopt(uint256 salt, bytes memory signature) external payable {
    uint256 currentPetId = _currentPetId;
    require(msg.sender == tx.origin, "CP: We like real users");
    require(_publicMintStatus == EPublicMintStatus.OPEN, "CP: Minting closed");
    require(currentPetId < MAX_PET_ID, "CP: Exceeds maximum Pet supply");
    require(msg.value == _price, "CP: Invalid Eth sent");
    require(_minted[msg.sender] == false, "CP: Address has minted a pet");

    // Mark address as minted
    _minted[msg.sender] = true;

    // verify
    require(_isValidSignature(keccak256(abi.encodePacked(msg.sender, salt)), signature), "CP: Invalid signature");

    // Pets bought by non-cat holders will have token ID increasing from 9,999 onwards, after cat and allow list holders
    _mint(msg.sender, currentPetId);

    unchecked {
      currentPetId++;
    }
    _currentPetId = currentPetId;
  }

  /// @notice Adopt via allow list with reference to a ticket number + merkle tree
  /// @dev Id tracking starts at 9999 to prevent id contamination
  /// @dev We could allow contracts to mint but saving gas for users is more important
  /// @dev Dont start ticketNumber at 0
  /// @param merkleProof Merkle proof for verifcation
  /// @param ticketNumber ticket number assigned to user's address
  function allowListAdopt(bytes32[] calldata merkleProof, uint256 ticketNumber) external payable {
    uint256 currentPetId = _currentPetId;
    require(msg.sender == tx.origin, "CP: We like real users");
    require(_publicMintStatus == EPublicMintStatus.ALLOW_LIST, "CP: Allow list closed");
    require(msg.value == _price, "CP: Invalid Eth sent");

    // Merkle magic
    bytes32 leaf = keccak256(abi.encodePacked(msg.sender, ticketNumber));
    require(MerkleProof.verify(merkleProof, _merkleRoot, leaf), "CP: Invalid merkle proof");

    // claim ticket
    _claimTicket(ticketNumber);

    // Pets bought by non-cat holders will have token ID increasing from 9,999 onwards
    _mint(msg.sender, currentPetId);

    unchecked {
      currentPetId++;
    }
    _currentPetId = currentPetId;
  }

  /// @notice To check and track ticket numbers being claimed against
  /// @dev Returns error if ticket is larger than range or has been claimed against
  /// @dev Uses bit manipulation in place of mapping
  /// @dev https://medium.com/donkeverse/hardcore-gas-savings-in-nft-minting-part-3-save-30-000-in-presale-gas-c945406e89f0
  /// @param ticketNumber ticket number assigned to user's address
  function _claimTicket(uint256 ticketNumber) internal {
    require(ticketNumber < _allowListTicketSlots.length * 256, "CP: Invalid ticket");

    uint256 storageOffset; // [][][]
    uint256 localGroup; // [][x][]
    uint256 offsetWithin256; // 0xF[x]FFF

    // We can trust the admin arent adding silly numbers - we hope :P
    unchecked {
      storageOffset = ticketNumber / 256;
      offsetWithin256 = ticketNumber % 256;
    }
    localGroup = _allowListTicketSlots[storageOffset];

    // [][x][] > 0x1111[x]1111 > 1
    require((localGroup >> offsetWithin256) & uint256(1) == 1, "CP: Ticket claimed");

    // [][x][] > 0x1111[x]1111 > (1) flip to (0)
    localGroup = localGroup & ~(uint256(1) << offsetWithin256);

    _allowListTicketSlots[storageOffset] = localGroup;
  }

  /// @notice Adopt N pets against cat Ids
  /// @dev Allows for users to select specific cats to claim against
  /// @dev Requires cat ownership to mint
  /// @dev Takes in an array of CC tokenIds to allow option for users with multiple cats to choose which to claim against
  /// @dev Checks tokenIds items against ERC721's _exist(id) function prior to mint
  /// @param tokenIds Array of CC tokenIds to be claimed against
  function adoptNPets(uint256[] memory tokenIds) external {
    require(msg.sender == tx.origin, "CP: We like real users");
    require(!_claimsPaused, "CP: Claiming paused");

    // Check if user is adopting less than 51 pets to avoid gassing out
    require(tokenIds.length < 51, "CP: Adoption limit is 50");

    ICoolCats memCats = ICoolCats(_ccAddress);

    for (uint256 i; i < tokenIds.length; i++) {
      uint256 catId = tokenIds[i];

      // Only cat owner can mint pets that dont already exist for their corresponding cat id
      // Gas loss prevention, for less careful users
      if (memCats.ownerOf(catId) == msg.sender && !_exists(catId)) {
        _mint(msg.sender, catId);
      }
    }
  }

  /// @notice Let Admin mint out 100 pets for giveaways and collabs
  function reservedMint() external onlyOwner {
    uint256 currentPetId = _currentPetId;
    uint256 reserved = _reserved;

    require(_publicMintStatus == EPublicMintStatus.RESERVED_MINT, "CP: Reserved mint closed");
    require(reserved > 0, "CP: No more reserve mints left");

    for (uint256 i; i < 20; i++) {
      _mint(msg.sender, currentPetId++);
    }

    _currentPetId = currentPetId;
    reserved -= 20;
    _reserved = reserved;
  }

  /// @notice Pause claiming of pets by cat holders
  /// @param val True or false
  function pauseClaim(bool val) external onlyOwner {
    _claimsPaused = val;
  }

  /// @notice Change the public minting status
  /// @param status Status to change to
  function setPublicMintStatus(uint256 status) external onlyOwner {
    require(status <= uint256(EPublicMintStatus.OPEN), "CP: Out of bounds");

    _publicMintStatus = EPublicMintStatus(status);
  }

  /// @notice Sets the mint data slot length that tracks the state of tickets
  /// @param num number of tickets available for allow list
  function setMintSlotLength(uint256 num) external onlyOwner {
    // Prevents us from over filling the Allow List
    require(_currentPetId + num <= MAX_PET_ID, "CP: More tickets than pets");

    // account for solidity rounding down
    uint256 slotCount = (num / 256) + 1;

    // set each element in the slot to binaries of 1
    uint256 MAX_INT = 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff;

    // create a temporary array based on number of slots required
    uint256[] memory arr = new uint256[](slotCount);

    // fill each element with MAX_INT
    for (uint256 i; i < slotCount; i++) {
      arr[i] = MAX_INT;
    }

    _allowListTicketSlots = arr;
  }

  /// @notice Set baseURI
  /// @param baseURI URI of the pet image server
  function setBaseURI(string memory baseURI) external onlyOwner {
    _baseTokenURI = baseURI;
  }

  /// @notice Get uri of tokens
  /// @return string Uri
  function _baseURI() internal view virtual override returns (string memory) {
    return _baseTokenURI;
  }

  /// @notice Set the purchase price of pets
  /// @param newPrice In wei - 10 ** 18
  function setPrice(uint256 newPrice) external onlyOwner {
    _price = newPrice;
  }

  /// @notice Set final genetics of a single pet
  /// @param id Id of the pet in question
  /// @param genes Genetics details of pet in question
  function setGenetics(uint256 id, bytes32 genes) external onlyOwner {
    _petGenetics[id] = genes;
  }

  /// @notice Set the system address
  /// @param systemAddress Address to set as systemAddress
  function setSystemAddress(address systemAddress) external onlyOwner {
    _systemAddress = systemAddress;
  }

  /// @notice Se the Cool Cats contract address
  /// @param ccAddress Address of the Cool Cats contract
  function setCoolCatsAddress(address ccAddress) external onlyOwner {
    _ccAddress = ccAddress;
  }

  /// @notice Set withdrawal address
  /// @param wallet Address of withdrawal target
  function setWithdrawalWallet(address wallet) external onlyOwner {
    _w1 = wallet;
  }

  /// @notice Set new Merkle Root
  /// @param merkleRoot Root of merkle tree
  function setMerkleRoot(bytes32 merkleRoot) external onlyOwner {
    require(!_merkleLocked, "CP: Merkle tree is locked");
    _merkleRoot = merkleRoot;
  }

  /// @notice Get genetics for this cat - future use (maybe :))
  /// @param id Id of the pet in question
  /// @return genes Genetics of the desired pet
  function getGenetics(uint256 id) external view returns (bytes32 genes) {
    return _petGenetics[id];
  }

  /// @notice Verify hashed data
  /// param hash Hashed data bundle
  /// @param signature Signature to check hash against
  /// @return bool Is verified or not
  function _isValidSignature(bytes32 hash, bytes memory signature) internal view returns (bool) {
    require(_systemAddress != address(0), "CP: Invalid system address");
    bytes32 signedHash = hash.toEthSignedMessageHash();
    return signedHash.recover(signature) == _systemAddress;
  }

  /// @notice Withdraw funds from contract
  function withdraw() external payable onlyOwner {
    payable(_w1).transfer(address(this).balance);
  }

  /// @notice Lock the merkle tree so it can not be edited
  function lockMerkle() external onlyOwner {
    _merkleLocked = true;
  }
}

File 2 of 13 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

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

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

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

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

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

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

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

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

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: 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 {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

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

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: 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 Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev 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 : ECDSA.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s;
        uint8 v;
        assembly {
            s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
            v := add(shr(255, vs), 27)
        }
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

File 4 of 13 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

    /**
     * @dev 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 {
        _transferOwnership(address(0));
    }

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

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

File 5 of 13 : MerkleProof.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Trees proofs.
 *
 * The proofs can be generated using the JavaScript library
 * https://github.com/miguelmota/merkletreejs[merkletreejs].
 * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
 *
 * See `test/utils/cryptography/MerkleProof.test.js` for some examples.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(
        bytes32[] memory proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merklee tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];
            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
            }
        }
        return computedHash;
    }
}

File 6 of 13 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, 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 7 of 13 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

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

File 8 of 13 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

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

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

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

File 9 of 13 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

File 10 of 13 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

File 11 of 13 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

File 12 of 13 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

File 13 of 13 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

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

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

00000000000000000000000000000000000000000000000000000000000000400000000000000000000000001a92f7381b9f03921564a437210bb9396471050c000000000000000000000000000000000000000000000000000000000000002e68747470733a2f2f6d657461646174612e636f6f6c636174736e66742e636f6d2f7065742f6d657461646174612f000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : baseURI (string): https://metadata.coolcatsnft.com/pet/metadata/
Arg [1] : ccContractAddress (address): 0x1A92f7381B9F03921564a437210bB9396471050C

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [1] : 0000000000000000000000001a92f7381b9f03921564a437210bb9396471050c
Arg [2] : 000000000000000000000000000000000000000000000000000000000000002e
Arg [3] : 68747470733a2f2f6d657461646174612e636f6f6c636174736e66742e636f6d
Arg [4] : 2f7065742f6d657461646174612f000000000000000000000000000000000000


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.