ETH Price: $3,374.06 (+0.07%)
Gas: 4 Gwei

Contract

0xE42caD6fC883877A76A26A16ed92444ab177E306
 

Overview

ETH Balance

0 ETH

Eth Value

$0.00
Transaction Hash
Method
Block
From
To
Value
0xdd136d7625b73d67c133ee04c778d7b30ef388fe147fa63a3b09640ede5db17c Set Approval For...(pending)2024-06-23 18:44:3635 hrs ago1719168276IN
ConsenSys: MERGE Token
0 ETH(Pending)(Pending)
0x7e3cb2afc1dc5a64f188aa7e3cbd1df5d0093b8152c768b9e1af9334198dcd06 Public Mint(pending)2024-06-23 8:49:5745 hrs ago1719132597IN
ConsenSys: MERGE Token
0 ETH(Pending)(Pending)
0x941229e8ac8f16c3914a1a51f1e297cd775b1f622d412d62ae9f49de7e02fafe Set Approval For...(pending)2024-06-23 5:16:362 days ago1719119796IN
ConsenSys: MERGE Token
0 ETH(Pending)(Pending)
0xd830fe3c2d3cd97566b39ce875112594de36060a5f9fe93a612fc5250798b513 Set Approval For...(pending)2024-06-23 4:15:322 days ago1719116132IN
ConsenSys: MERGE Token
0 ETH(Pending)(Pending)
0xd2dab8ae682702cef9f5f908834839c6b77347268497855126d6b6b6569035e5 Public Mint(pending)2024-06-23 3:29:592 days ago1719113399IN
ConsenSys: MERGE Token
0 ETH(Pending)(Pending)
0x88f801dd07b4ed82462f37d06321c1a5413d060266621f4f0285e4401d987a78 Public Mint(pending)2024-06-23 3:16:212 days ago1719112581IN
ConsenSys: MERGE Token
0 ETH(Pending)(Pending)
0xcc45a829772e1fbc80fc7745b4aa14a1f2d07affdc462c84ef438031dc640507 Public Mint(pending)2024-06-23 2:37:202 days ago1719110240IN
ConsenSys: MERGE Token
0 ETH(Pending)(Pending)
0x57ffb99d49daabc5c620cbf14a1808414ef9760fced6d16b822802a0b4477763 Public Mint(pending)2024-06-23 2:12:512 days ago1719108771IN
ConsenSys: MERGE Token
0 ETH(Pending)(Pending)
0xaa70aff5058b298109a4b9e8a05d599723064b90dc621489f99ade3a1ebeb349 Public Mint(pending)2024-06-23 1:40:082 days ago1719106808IN
ConsenSys: MERGE Token
0 ETH(Pending)(Pending)
Set Approval For...201666492024-06-25 5:35:591 hr ago1719293759IN
ConsenSys: MERGE Token
0 ETH0.0001423.07626261
Transfer From201661572024-06-25 3:57:232 hrs ago1719287843IN
ConsenSys: MERGE Token
0 ETH0.000392116.82157013
Set Approval For...201562452024-06-23 18:41:4736 hrs ago1719168107IN
ConsenSys: MERGE Token
0 ETH0.000077242.94005839
Set Approval For...201562442024-06-23 18:41:3536 hrs ago1719168095IN
ConsenSys: MERGE Token
0 ETH0.000069072.84586966
Set Approval For...201550152024-06-23 14:34:1140 hrs ago1719153251IN
ConsenSys: MERGE Token
0 ETH0.000077833.19881838
Set Approval For...201548532024-06-23 14:01:4740 hrs ago1719151307IN
ConsenSys: MERGE Token
0 ETH0.000171853.7229245
Set Approval For...201547122024-06-23 13:33:2341 hrs ago1719149603IN
ConsenSys: MERGE Token
0 ETH0.000120552.60684961
Set Approval For...201545752024-06-23 13:05:5941 hrs ago1719147959IN
ConsenSys: MERGE Token
0 ETH0.000087943.62328099
Set Approval For...201542632024-06-23 12:02:5942 hrs ago1719144179IN
ConsenSys: MERGE Token
0 ETH0.000058492.40986509
Set Approval For...201539842024-06-23 11:06:4743 hrs ago1719140807IN
ConsenSys: MERGE Token
0 ETH0.000056592.33386079
Set Approval For...201534582024-06-23 9:20:5945 hrs ago1719134459IN
ConsenSys: MERGE Token
0 ETH0.000159863.46327529
Set Approval For...201534182024-06-23 9:12:5945 hrs ago1719133979IN
ConsenSys: MERGE Token
0 ETH0.000187624.06476821
Set Approval For...201529242024-06-23 7:31:3547 hrs ago1719127895IN
ConsenSys: MERGE Token
0 ETH0.000176443.82251998
Set Approval For...201512112024-06-23 1:47:112 days ago1719107231IN
ConsenSys: MERGE Token
0 ETH0.000099082.14259643
Set Approval For...201507752024-06-23 0:19:472 days ago1719101987IN
ConsenSys: MERGE Token
0 ETH0.000058412.40090581
Set Approval For...201504662024-06-22 23:17:472 days ago1719098267IN
ConsenSys: MERGE Token
0 ETH0.000093142.01410979
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Latest 7 internal transactions

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Parent Transaction Hash Block From To Value
155575162022-09-18 2:40:11646 days ago1663468811
ConsenSys: MERGE Token
0.00687654 ETH
155503432022-09-17 2:30:23647 days ago1663381823
ConsenSys: MERGE Token
0.001 ETH
155498402022-09-17 0:49:23647 days ago1663375763
ConsenSys: MERGE Token
0.00100261 ETH
155450532022-09-16 8:39:23647 days ago1663317563
ConsenSys: MERGE Token
0.00685986 ETH
155405512022-09-15 17:23:11648 days ago1663262591
ConsenSys: MERGE Token
0.05 ETH
155396492022-09-15 14:20:11648 days ago1663251611
ConsenSys: MERGE Token
0.03153241 ETH
155382842022-09-15 9:43:11648 days ago1663234991
ConsenSys: MERGE Token
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Contract Source Code Verified (Exact Match)

Contract Name:
TheMergeNFT

Compiler Version
v0.8.16+commit.07a7930e

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 11 : TheMerge.sol
/*******************************************************************************

  ██████╗░███████╗░██████╗░███████╗███╗░░██╗███████╗░██████╗██╗░██████╗
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  ██████╔╝█████╗░░██║░░██╗░█████╗░░██╔██╗██║█████╗░░╚█████╗░██║╚█████╗░
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  ╚═╝░░╚═╝╚══════╝░╚═════╝░╚══════╝╚═╝░░╚══╝╚══════╝╚═════╝░╚═╝╚═════╝░



  ▀█▀ █░█ █▀▀   █▀▄▀█ █▀▀ █▀█ █▀▀ █▀▀   █▄░█ █▀▀ ▀█▀
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  A special thanks to the ETH2 contributors

donations.0xSplits.eth,  Artem Vorotnikov,   Parithosh Jayanthi,   Rafael Matias,
Guillaume Ballet,    Jared Wasinger,     Marius van der Wijden,     Matt Garnett,
Peter Szilagyi,  Andrei Maiboroda,   Jose Hugo de la cruz Romero,   Paweł Bylica,
Andrew Day,   Gabriel,   Holger Drewes,   Jochem,   Scotty Poi,   Jacob Kaufmann,
Jason Carver, Mike Ferris, Ognyan Genev,  Piper Merriam,  Danny Ryan,  Tim Beiko,
Trenton Van Epps, Aditya Asgaonkar, Alex Stokes, Ansgar Dietrichs, Antonio Sanso,
Carl Beekhuizen,    Dankrad Feist,    Dmitry Khovratovich,     Francesco d’Amato,
George Kadianakis,    Hsiao Wei Wang,    Justin Drake,    Mark Simkin,     Proto,
Zhenfei Zhang, Anders, Barnabé Monnot, Caspar Schwarz-Schilling,  David Theodore,
Fredrik Svantes,  Justin Traglia,  Tyler Holmes,  Yoav Weiss,   Alex Beregszaszi,
Harikrishnan Mulackal,    Kaan Uzdogan,     Kamil Sliwak,     Leonardo de Sa Alt,
Mario Vega,     Andrey Ashikhmin,     Enrique Avila Asapche,      Giulio rebuffo,
Michelangelo Riccobene,     Tullio Canepa,     Pooja Ranjan,      Daniel Lehrner,
Danno Ferrin, Gary Schulte, Jiri Peinlich, Justin Florentine,  Karim Taam,  Guru,
Jim mcDonald,   Peter Davies,    Adrian Manning,    Diva Martínez,    Mac Ladson,
Mark Mackey, Mehdi Zerouali, Michael Sproul,  Paul Hauner,  Pawan Dhananjay Ravi,
Sean Anderson, Cayman Nava, Dadepo Aderemi, dapplion,  Gajinder Singh,  Phil Ngo,
Tuyen Nguyen,  Daniel Caleda,   Jorge Mederos,   Łukasz Rozmej,   Marcin Sobczak,
Marek Moraczyński,  Mateusz Jędrzejewski,  Tanishq,  Tomasz Stanzeck,   James He,
Kasey Kirkham, Nishant Das, potuz, Preston Van Loon, Radosław Kapka, Raul Jordan,
Taran Singh,    Terence Tsao,    Sam Wilson,     Dustin Brody,     Etan Kissling,
Eugene Kabanov,   Jacek Sieka,   Jordan Hrycaj,    Kim De Mey,    Konrad Staniec,
Mamy Ratsimbazafy,      Zahary Karadzhov,      Adrian Sutton,      Ben Edgington,
Courtney Hunter,  Dmitry Shmatko,  Enrico Del Fante,  Paul Harris,   Alex Vlasov,
Anton Nashatyrev, Mikhail Kalinin

*******************************************************************************/

pragma solidity 0.8.16;

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

/**
 * @dev Revert with an error when the mint is not active
 */
error MintNotActive();

/**
 * @dev Revert with an error mint to recipients count does not match supply
 */
error RecipientLengthDoesNotMatchSupply();

/**
 * @dev Revert with an error when trying to set the mint active when it was already set active
 */
error AlreadySetActive();

/**
 * @dev Revert with an error when trying to mint an invalid token
 */
error InvalidToken();

/**
 * @dev Revert with an error if PoS is not yet active
 */
error PoSNotActive();

/**
 * @dev Revert if we've minted all the tokens
 */
error SoldOut();

/**
 * @dev Revert if we have frozen setting URIs
 */
error TokenUrisFrozen();

contract TheMergeNFT is ERC721, Ownable {
    string private TIER_1_TOKEN_URI;

    string private TIER_2A_TOKEN_URI;
    string private TIER_2B_TOKEN_URI;
    string private TIER_2C_TOKEN_URI;

    string private OPEN_EDITION_TOKEN_URI;
    uint64 private constant OPEN_EDITION_LENGTH = 3 days;

    address private constant TIER_1_RECIPIENT = 0xDa12b368a93007Ef2446717765917933cEBC6080;

    // supply of 1
    uint256 private constant TIER_1_TOKEN_ID = 1;
    // supply of 119
    uint256 private constant TIER_2A_STARTING_TOKEN_ID = 2;
    // supply of 119
    uint256 private constant TIER_2B_STARTING_TOKEN_ID = 121;
    // supply of 119
    uint256 private constant TIER_2C_STARTING_TOKEN_ID = 240;

    // Supply of 119
    uint256 private constant TIER_2_SUPPLY = 119;

    // difficulty threshold at which PoS is active
    uint256 private constant POW_MAX_DIFFICULTY = 2**64;

    uint128 private constant OPEN_EDITION_STARTING_TOKEN_ID = 359;

    uint128 private nextTokenId = OPEN_EDITION_STARTING_TOKEN_ID;
    uint64 public mintOpenUntil;

    // Override in case PoS check doesn't trigger (as this is harder to test)
    bool private isPoSOverrideEnabled = false;

    // Until true, admins can set token URIs
    bool public isFrozen = false;

    constructor(
        string memory tier1TokenUri,
        string memory tier2ATokenUri,
        string memory tier2BTokenUri,
        string memory tier2CTokenUri,
        string memory openEditionTokenUri
    ) ERC721("TheMerge", "MERGE") {
        TIER_1_TOKEN_URI = tier1TokenUri;
        TIER_2A_TOKEN_URI = tier2ATokenUri;
        TIER_2B_TOKEN_URI = tier2BTokenUri;
        TIER_2C_TOKEN_URI = tier2CTokenUri;
        OPEN_EDITION_TOKEN_URI = openEditionTokenUri;
    }

    modifier onlyPoS() {
        if (!isPoS() && !isPoSOverrideEnabled) {
            revert PoSNotActive();
        }
        _;
    }

    /**
     * @notice Returns whether Proof of Stake is active
     */
    function isPoS() internal returns (bool) {
        return block.difficulty > POW_MAX_DIFFICULTY || block.difficulty == 0;
    }

    /**
     * @notice Mint an open edition NFT - restricted to a specific time window
     */
    function publicMint() external {
        if (block.timestamp > mintOpenUntil) {
            revert MintNotActive();
        }
        if (nextTokenId == type(uint128).max) {
            revert SoldOut();
        }
        _mint(_msgSender(), nextTokenId++);
    }

    /**
     * @notice See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        if (tokenId == TIER_1_TOKEN_ID) {
            return TIER_1_TOKEN_URI;
        }

        if (tokenId < TIER_2B_STARTING_TOKEN_ID) {
            return TIER_2A_TOKEN_URI;
        }

        if (tokenId < TIER_2C_STARTING_TOKEN_ID) {
            return TIER_2B_TOKEN_URI;
        }

        if (tokenId < OPEN_EDITION_STARTING_TOKEN_ID) {
            return TIER_2C_TOKEN_URI;
        }

        _requireMinted(tokenId);
        return OPEN_EDITION_TOKEN_URI;
    }

    /**
     * @notice Set the open edition mint to active
     * @dev Restricted to admins. Cannot set active more than once.
     */
    function setActive() external onlyPoS {
        if (mintOpenUntil != 0) {
            revert AlreadySetActive();
        }

        mintOpenUntil = uint64(block.timestamp) + OPEN_EDITION_LENGTH;
    }

    /**
     * @notice Mint the tier 1 token to contract owner
     * @dev Open to public calls but requires PoS active
     */
    function publicTier1MintToOwner() external {
        if (!isPoS()) {
            revert PoSNotActive();
        }

        _mint(TIER_1_RECIPIENT, TIER_1_TOKEN_ID);
    }

    /**
     * @notice Mint a token
     * @dev Restricted to admins.
     * @param tokenId The token to mint
     * @param recipient The address to mint the token to
     */
    function adminMintTo(uint256 tokenId, address recipient) external onlyOwner onlyPoS {
        if (tokenId >= OPEN_EDITION_STARTING_TOKEN_ID) {
            revert InvalidToken();
        }
        _mint(recipient, tokenId);
    }

    /**
     * @notice Mint all Tier2A NFTs to the msg sender
     * @dev Restricted to admins
     * @param recipients The recipient addresses to mint the tokens to
     */
    function adminMintAllTier2ATo(address[] memory recipients) external onlyOwner onlyPoS {
        uint256 tier2Supply = TIER_2_SUPPLY;

        if (recipients.length != tier2Supply) {
            revert RecipientLengthDoesNotMatchSupply();
        }

        for (uint256 i = 0; i < tier2Supply; i++) {
            _mint(recipients[i], TIER_2A_STARTING_TOKEN_ID + i);
        }
    }

    /**
     * @notice Mint all Tier2B NFTs to the msg sender
     * @dev Restricted to admins
     * @param recipients The recipient addresses to mint the tokens to
     */
    function adminMintAllTier2BTo(address[] memory recipients) external onlyOwner onlyPoS {
        uint256 tier2Supply = TIER_2_SUPPLY;

        if (recipients.length != tier2Supply) {
            revert RecipientLengthDoesNotMatchSupply();
        }

        for (uint256 i = 0; i < tier2Supply; i++) {
            _mint(recipients[i], TIER_2B_STARTING_TOKEN_ID + i);
        }
    }

    /**
     * @notice Mint all Tier2C NFTs to the msg sender
     * @dev Restricted to admins
     * @param recipients The recipient addresses to mint the tokens to
     */
    function adminMintAllTier2CTo(address[] memory recipients) external onlyOwner onlyPoS {
        uint256 tier2Supply = TIER_2_SUPPLY;

        if (recipients.length != tier2Supply) {
            revert RecipientLengthDoesNotMatchSupply();
        }

        for (uint256 i = 0; i < tier2Supply; i++) {
            _mint(recipients[i], TIER_2C_STARTING_TOKEN_ID + i);
        }
    }

    /**
     * @notice Function to override the PoS check
     * @dev Restricted to admins
     */
    function adminSetPoSOverride() external onlyOwner {
        isPoSOverrideEnabled = true;
    }

    /**
     * @notice Set token URIs
     * @dev Restricted to admins
     * @param tier1TokenUri TIER_1_TOKEN_URI value
     * @param tier2ATokenUri TIER_2A_TOKEN_URI value
     * @param tier2BTokenUri TIER_2B_TOKEN_URI value
     * @param tier2CTokenUri TIER_2C_TOKEN_URI value
     * @param openEditionTokenUri OPEN_EDITION_TOKEN_URI value
     */
    function adminSetTokenUris(
        string memory tier1TokenUri,
        string memory tier2ATokenUri,
        string memory tier2BTokenUri,
        string memory tier2CTokenUri,
        string memory openEditionTokenUri
    ) external onlyOwner {
        if (isFrozen == true) {
            revert TokenUrisFrozen();
        }
        TIER_1_TOKEN_URI = tier1TokenUri;
        TIER_2A_TOKEN_URI = tier2ATokenUri;
        TIER_2B_TOKEN_URI = tier2BTokenUri;
        TIER_2C_TOKEN_URI = tier2CTokenUri;
        OPEN_EDITION_TOKEN_URI = openEditionTokenUri;
    }

    /**
     * @notice Sets isFrozen flag to true
     * @dev Restricted to admins; cannot be undone
     */
    function adminSetFrozen() external onlyOwner {
        isFrozen = true;
    }
}

File 2 of 11 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

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

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

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

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

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

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

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

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

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: address zero is not a valid owner");
        return _balances[owner];
    }

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

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

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

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

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

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

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

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

        _approve(to, tokenId);
    }

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

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

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

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

        _transfer(from, to, tokenId);
    }

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

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

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

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

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

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

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

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

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

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

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

        _afterTokenTransfer(address(0), to, tokenId);
    }

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

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

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

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

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

        _afterTokenTransfer(owner, address(0), tokenId);
    }

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

        _beforeTokenTransfer(from, to, tokenId);

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

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

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId);
    }

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

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

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

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

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

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

File 3 of 11 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

File 4 of 11 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

File 5 of 11 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

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

File 6 of 11 : 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 7 of 11 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 8 of 11 : 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 9 of 11 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

File 10 of 11 : 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 11 of 11 : 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

[{"inputs":[{"internalType":"string","name":"tier1TokenUri","type":"string"},{"internalType":"string","name":"tier2ATokenUri","type":"string"},{"internalType":"string","name":"tier2BTokenUri","type":"string"},{"internalType":"string","name":"tier2CTokenUri","type":"string"},{"internalType":"string","name":"openEditionTokenUri","type":"string"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"AlreadySetActive","type":"error"},{"inputs":[],"name":"InvalidToken","type":"error"},{"inputs":[],"name":"MintNotActive","type":"error"},{"inputs":[],"name":"PoSNotActive","type":"error"},{"inputs":[],"name":"RecipientLengthDoesNotMatchSupply","type":"error"},{"inputs":[],"name":"SoldOut","type":"error"},{"inputs":[],"name":"TokenUrisFrozen","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address[]","name":"recipients","type":"address[]"}],"name":"adminMintAllTier2ATo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"recipients","type":"address[]"}],"name":"adminMintAllTier2BTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"recipients","type":"address[]"}],"name":"adminMintAllTier2CTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"}],"name":"adminMintTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"adminSetFrozen","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"adminSetPoSOverride","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"tier1TokenUri","type":"string"},{"internalType":"string","name":"tier2ATokenUri","type":"string"},{"internalType":"string","name":"tier2BTokenUri","type":"string"},{"internalType":"string","name":"tier2CTokenUri","type":"string"},{"internalType":"string","name":"openEditionTokenUri","type":"string"}],"name":"adminSetTokenUris","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isFrozen","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mintOpenUntil","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"publicMint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"publicTier1MintToOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"setActive","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

00000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000016000000000000000000000000000000000000000000000000000000000000001a000000000000000000000000000000000000000000000000000000000000000076e6f742d7365740000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000076e6f742d7365740000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000076e6f742d7365740000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000076e6f742d7365740000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000076e6f742d73657400000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : tier1TokenUri (string): not-set
Arg [1] : tier2ATokenUri (string): not-set
Arg [2] : tier2BTokenUri (string): not-set
Arg [3] : tier2CTokenUri (string): not-set
Arg [4] : openEditionTokenUri (string): not-set

-----Encoded View---------------
15 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000120
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000160
Arg [4] : 00000000000000000000000000000000000000000000000000000000000001a0
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [6] : 6e6f742d73657400000000000000000000000000000000000000000000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [8] : 6e6f742d73657400000000000000000000000000000000000000000000000000
Arg [9] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [10] : 6e6f742d73657400000000000000000000000000000000000000000000000000
Arg [11] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [12] : 6e6f742d73657400000000000000000000000000000000000000000000000000
Arg [13] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [14] : 6e6f742d73657400000000000000000000000000000000000000000000000000


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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.