ETH Price: $3,678.52 (+2.16%)

Token

ERC-20: BLAME GAME OE 2 by Vexx (BLAMEGAMEOEBYVEXX)
 

Overview

Max Total Supply

0 BLAMEGAMEOEBYVEXX

Holders

69

Market

Volume (24H)

N/A

Min Price (24H)

N/A

Max Price (24H)

N/A

Other Info

Filtered by Token Holder
wuckwuck.eth
Balance
1 BLAMEGAMEOEBYVEXX
0x0b1f63aa013e8a58141c12fd325aec6521f22c59
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OVERVIEW

Vexx is one of the most recognized visual artists of his generation. A self-taught creative working out of Belgium, he started his signature doodle style at 16 years old. Now at 22, he has an Instagram following of 840K, with over 2.9M subscribers on YouTube. His clients include Porsche, Puma, Converse, Samsung, RedBull, Amazon Prime, AJ Tracey, Stormzy and he has been featured in Complex, NTWRK, and the cover of Time Out NY’s expose on NYC Street art.

# Exchange Pair Price  24H Volume % Volume

Minimal Proxy Contract for 0xc16bea34a4ae71cebe2a6b8ec1d86829fed89d4c

Contract Name:
NiftyERC721Token

Compiler Version
v0.8.9+commit.e5eed63a

Optimization Enabled:
Yes with 1500 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 33 : NiftyERC721Token.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;                                                                                                                                                                                                                                            
                                                                                
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//          ~;;;;;              .;;;;;~           '!Lx5mEEmyt|!'    ;;;~          
//
// Powered By:    @niftygateway
// Author:        @niftynathang
// Collaborators: @conviction_1 
//                @stormihoebe
//                @smatthewenglish
//                @dccockfoster
//                @blainemalone
                                                                                
                                                                                                   

import "./ERC721Omnibus.sol";
import "../interfaces/IERC2309.sol";
import "../interfaces/IERC721MetadataGenerator.sol";
import "../interfaces/IERC721DefaultOwnerCloneable.sol";
import "../structs/NiftyType.sol";
import "../utils/Signable.sol";
import "../utils/Withdrawable.sol";
import "../utils/Royalties.sol";

contract NiftyERC721Token is ERC721Omnibus, Royalties, Signable, Withdrawable, IERC2309 {    
    using Address for address;        
    
    event NiftyTypeCreated(address indexed contractAddress, uint256 niftyType, uint256 idFirst, uint256 idLast);
    
    uint256 constant internal MAX_INT = 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff;    

    // A pointer to a contract that can generate token URI/metadata
    IERC721MetadataGenerator internal metadataGenerator;

    // Used to determine next nifty type/token ids to create on a mint call
    NiftyType internal lastNiftyType;

    // Sorted array of NiftyType definitions - ordered to allow binary searching
    NiftyType[] internal niftyTypes;               

    // Mapping from Nifty type to IPFS hash of canonical artifact file.
    mapping(uint256 => string) private niftyTypeIPFSHashes;

    constructor() {
        
    }                                     

    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721Omnibus, Royalties, NiftyPermissions) returns (bool) {
        return          
        interfaceId == type(IERC2309).interfaceId ||
        super.supportsInterface(interfaceId);
    }                                     

    function setMetadataGenerator(address metadataGenerator_) external {  
        _requireOnlyValidSender();
        if(metadataGenerator_ == address(0)) {
            metadataGenerator = IERC721MetadataGenerator(metadataGenerator_);
        } else {
            require(IERC165(metadataGenerator_).supportsInterface(type(IERC721MetadataGenerator).interfaceId), "Invalid Metadata Generator");        
            metadataGenerator = IERC721MetadataGenerator(metadataGenerator_);
        }        
    }

    function finalizeContract() external {
        _requireOnlyValidSender();
        require(!collectionStatus.isContractFinalized, ERROR_CONTRACT_IS_FINALIZED);        
        collectionStatus.isContractFinalized = true;
    }

    function tokenURI(uint256 tokenId) public virtual view override returns (string memory) {
        if(address(metadataGenerator) == address(0)) {
            return super.tokenURI(tokenId);
        } else {
            require(_exists(tokenId), ERROR_QUERY_FOR_NONEXISTENT_TOKEN);        
            return metadataGenerator.tokenMetadata(tokenId, _getNiftyType(tokenId), bytes(""));
        }                
    }

    function tokenIPFSHash(uint256 tokenId) external view returns (string memory) {
        require(_exists(tokenId), ERROR_QUERY_FOR_NONEXISTENT_TOKEN);        
        return niftyTypeIPFSHashes[_getNiftyType(tokenId)];
    }    

    function setIPFSHash(uint256 niftyType, string memory ipfsHash) external {
        _requireOnlyValidSender();
        require(bytes(niftyTypeIPFSHashes[niftyType]).length == 0, "ERC721Metadata: IPFS hash already set");
        niftyTypeIPFSHashes[niftyType] = ipfsHash;        
    }

    function mint(uint256[] calldata amounts, string[] calldata ipfsHashes) external {
        _requireOnlyValidSender();
        
        require(amounts.length > 0 && ipfsHashes.length > 0, ERROR_INPUT_ARRAY_EMPTY);
        require(amounts.length == ipfsHashes.length, ERROR_INPUT_ARRAY_SIZE_MISMATCH);

        address to = collectionStatus.defaultOwner;                
        require(to != address(0), ERROR_TRANSFER_TO_ZERO_ADDRESS);                
        require(!collectionStatus.isContractFinalized, ERROR_CONTRACT_IS_FINALIZED);                
        
        uint88 initialIdLast = lastNiftyType.idLast;
        uint72 nextNiftyType = lastNiftyType.niftyType;
        uint88 nextIdCounter = initialIdLast + 1;
        uint88 firstNewTokenId = nextIdCounter;
        uint88 lastIdCounter = 0;

        for(uint256 i = 0; i < amounts.length; i++) {
            require(amounts[i] > 0, ERROR_NO_TOKENS_MINTED);            
            uint88 amount = uint88(amounts[i]);                        
            lastIdCounter = nextIdCounter + amount - 1;
            nextNiftyType++;
            
            if(bytes(ipfsHashes[i]).length > 0) {
                niftyTypeIPFSHashes[nextNiftyType] = ipfsHashes[i];
            }
            
            niftyTypes.push(NiftyType({
                isMinted: true,
                niftyType: nextNiftyType, 
                idFirst: nextIdCounter, 
                idLast: lastIdCounter
            }));

            emit NiftyTypeCreated(address(this), nextNiftyType, nextIdCounter, lastIdCounter);

            nextIdCounter += amount;            
        }
        
        uint256 newlyMinted = lastIdCounter - initialIdLast;        
                
        balances[to] += newlyMinted;

        lastNiftyType.niftyType = nextNiftyType;
        lastNiftyType.idLast = lastIdCounter;

        collectionStatus.amountCreated += uint88(newlyMinted);        

        emit ConsecutiveTransfer(firstNewTokenId, lastIdCounter, address(0), to);
    }        

    function setBaseURI(string calldata uri) external {
        _requireOnlyValidSender();
        _setBaseURI(uri);        
    }

    function exists(uint256 tokenId) public view returns (bool) {
        return _exists(tokenId);
    }    

    function burn(uint256 tokenId) public {
        _burn(tokenId);
    }

    function burnBatch(uint256[] calldata tokenIds) public {
        require(tokenIds.length > 0, ERROR_INPUT_ARRAY_EMPTY);
        for(uint256 i = 0; i < tokenIds.length; i++) {
            _burn(tokenIds[i]);
        }        
    }

    function getNiftyTypes() public view returns (NiftyType[] memory) {
        return niftyTypes;
    }

    function getNiftyTypeDetails(uint256 niftyType) public view returns (NiftyType memory) {
        uint256 niftyTypeIndex = MAX_INT;
        unchecked {
            niftyTypeIndex = niftyType - 1;
        }
        
        if(niftyTypeIndex >= niftyTypes.length) {
            revert('Nifty Type Does Not Exist');
        }
        return niftyTypes[niftyTypeIndex];
    }    
    
    function _isValidTokenId(uint256 tokenId) internal virtual view override returns (bool) {        
        return tokenId > 0 && tokenId <= collectionStatus.amountCreated;
    }    

    // Performs a binary search of the nifty types array to find which nifty type a token id is associated with
    // This is more efficient than iterating the entire nifty type array until the proper entry is found.
    // This is O(log n) instead of O(n)
    function _getNiftyType(uint256 tokenId) internal virtual override view returns (uint256) {        
        uint256 min = 0;
        uint256 max = niftyTypes.length - 1;
        uint256 guess = (max - min) / 2;
        
        while(guess < niftyTypes.length) {
            NiftyType storage guessResult = niftyTypes[guess];
            if(tokenId >= guessResult.idFirst && tokenId <= guessResult.idLast) {
                return guessResult.niftyType;
            } else if(tokenId > guessResult.idLast) {
                min = guess + 1;
                guess = min + (max - min) / 2;
            } else if(tokenId < guessResult.idFirst) {
                max = guess - 1;
                guess = min + (max - min) / 2;
            }
        }

        return 0;
    }       
}

File 2 of 33 : ERC721Omnibus.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./ERC721.sol";
import "../interfaces/IERC721DefaultOwnerCloneable.sol";

abstract contract ERC721Omnibus is ERC721, IERC721DefaultOwnerCloneable {
    
    struct TokenOwner {
        bool transferred;
        address ownerAddress;
    }

    struct CollectionStatus {
        bool isContractFinalized; // 1 byte
        uint88 amountCreated; // 11 bytes
        address defaultOwner; // 20 bytes
    }    

    // Only allow Nifty Entity to be initialized once
    bool internal initializedDefaultOwner;
    CollectionStatus internal collectionStatus;

    // Mapping from token ID to owner address    
    mapping(uint256 => TokenOwner) internal ownersOptimized;    

    function initializeDefaultOwner(address defaultOwner_) public {
        require(!initializedDefaultOwner, ERROR_REINITIALIZATION_NOT_PERMITTED);
        collectionStatus.defaultOwner = defaultOwner_;
        initializedDefaultOwner = true;
    }       

    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721, IERC165) returns (bool) {
        return         
        interfaceId == type(IERC721DefaultOwnerCloneable).interfaceId ||
        super.supportsInterface(interfaceId);
    }    

    function getCollectionStatus() public view virtual returns (CollectionStatus memory) {
        return collectionStatus;
    }
 
    function ownerOf(uint256 tokenId) public view virtual override returns (address owner) {
        require(_isValidTokenId(tokenId), ERROR_QUERY_FOR_NONEXISTENT_TOKEN);
        owner = ownersOptimized[tokenId].transferred ? ownersOptimized[tokenId].ownerAddress : collectionStatus.defaultOwner;
        require(owner != address(0), ERROR_QUERY_FOR_NONEXISTENT_TOKEN);
    }        
    
    function _exists(uint256 tokenId) internal view virtual override returns (bool) {
        if(_isValidTokenId(tokenId)) {            
            return ownersOptimized[tokenId].ownerAddress != address(0) || !ownersOptimized[tokenId].transferred;
        }
        return false;   
    }
    
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual override returns (address owner, bool isApprovedOrOwner) {
        owner = ownerOf(tokenId);
        isApprovedOrOwner = (spender == owner || tokenApprovals[tokenId] == spender || isApprovedForAll(owner, spender));
    }       

    function _clearOwnership(uint256 tokenId) internal virtual override {
        ownersOptimized[tokenId].transferred = true;
        ownersOptimized[tokenId].ownerAddress = address(0);
    }

    function _setOwnership(address to, uint256 tokenId) internal virtual override {
        ownersOptimized[tokenId].transferred = true;
        ownersOptimized[tokenId].ownerAddress = to;
    }               

    function _isValidTokenId(uint256 /*tokenId*/) internal virtual view returns (bool);    
}

File 3 of 33 : IERC2309.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

/**
 * @dev Interface of the ERC2309 standard as defined in the EIP.
 */
interface IERC2309 {
    
    /**
     * @dev Emitted when consecutive token ids in range ('fromTokenId') to ('toTokenId') are transferred from one account (`fromAddress`) to
     * another (`toAddress`).
     *
     * Note that `value` may be zero.
     */
    event ConsecutiveTransfer(uint256 indexed fromTokenId, uint256 toTokenId, address indexed fromAddress, address indexed toAddress);
}

File 4 of 33 : IERC721MetadataGenerator.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./IERC165.sol";

interface IERC721MetadataGenerator is IERC165 {    
    function tokenMetadata(uint256 tokenId, uint256 niftyType, bytes calldata data) external view returns (string memory);
}

File 5 of 33 : IERC721DefaultOwnerCloneable.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./IERC165.sol";

interface IERC721DefaultOwnerCloneable is IERC165 {
    function initializeDefaultOwner(address defaultOwner_) external;    
}

File 6 of 33 : NiftyType.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

struct NiftyType {
    bool isMinted; // 1 bytes
    uint72 niftyType; // 9 bytes
    uint88 idFirst; // 11 bytes
    uint88 idLast; // 11 bytes
}

File 7 of 33 : Signable.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./NiftyPermissions.sol";
import "../libraries/ECDSA.sol";
import "../structs/SignatureStatus.sol";

abstract contract Signable is NiftyPermissions {        

    event ContractSigned(address signer, bytes32 data, bytes signature);

    SignatureStatus public signatureStatus;
    bytes public signature;

    string internal constant ERROR_CONTRACT_ALREADY_SIGNED = "Contract already signed";
    string internal constant ERROR_CONTRACT_NOT_SALTED = "Contract not salted";
    string internal constant ERROR_INCORRECT_SECRET_SALT = "Incorrect secret salt";
    string internal constant ERROR_SALTED_HASH_SET_TO_ZERO = "Salted hash set to zero";
    string internal constant ERROR_SIGNER_SET_TO_ZERO = "Signer set to zero address";

    function setSigner(address signer_, bytes32 saltedHash_) external {
        _requireOnlyValidSender();

        require(signer_ != address(0), ERROR_SIGNER_SET_TO_ZERO);
        require(saltedHash_ != bytes32(0), ERROR_SALTED_HASH_SET_TO_ZERO);
        require(!signatureStatus.isVerified, ERROR_CONTRACT_ALREADY_SIGNED);
        
        signatureStatus.signer = signer_;
        signatureStatus.saltedHash = saltedHash_;
        signatureStatus.isSalted = true;
    }

    function sign(uint256 salt, bytes calldata signature_) external {
        require(!signatureStatus.isVerified, ERROR_CONTRACT_ALREADY_SIGNED);        
        require(signatureStatus.isSalted, ERROR_CONTRACT_NOT_SALTED);
        
        address expectedSigner = signatureStatus.signer;
        bytes32 expectedSaltedHash = signatureStatus.saltedHash;

        require(_msgSender() == expectedSigner, ERROR_INVALID_MSG_SENDER);
        require(keccak256(abi.encodePacked(salt)) == expectedSaltedHash, ERROR_INCORRECT_SECRET_SALT);
        require(ECDSA.recover(ECDSA.toEthSignedMessageHash(expectedSaltedHash), signature_) == expectedSigner, ERROR_UNEXPECTED_DATA_SIGNER);
        
        signature = signature_;        
        signatureStatus.isVerified = true;

        emit ContractSigned(expectedSigner, expectedSaltedHash, signature_);
    }
}

File 8 of 33 : Withdrawable.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./RejectEther.sol";
import "./NiftyPermissions.sol";
import "../interfaces/IERC20.sol";
import "../interfaces/IERC721.sol";

abstract contract Withdrawable is RejectEther, NiftyPermissions {

    /**
     * @dev Slither identifies an issue with sending ETH to an arbitrary destianation.
     * https://github.com/crytic/slither/wiki/Detector-Documentation#functions-that-send-ether-to-arbitrary-destinations
     * Recommended mitigation is to "Ensure that an arbitrary user cannot withdraw unauthorized funds."
     * This mitigation has been performed, as only the contract admin can call 'withdrawETH' and they should
     * verify the recipient should receive the ETH first.
     */
    function withdrawETH(address payable recipient, uint256 amount) external {
        _requireOnlyValidSender();
        require(amount > 0, ERROR_ZERO_ETH_TRANSFER);
        require(recipient != address(0), "Transfer to zero address");

        uint256 currentBalance = address(this).balance;
        require(amount <= currentBalance, ERROR_INSUFFICIENT_BALANCE);

        //slither-disable-next-line arbitrary-send        
        (bool success,) = recipient.call{value: amount}("");
        require(success, ERROR_WITHDRAW_UNSUCCESSFUL);
    }
        
    function withdrawERC20(address tokenContract, address recipient, uint256 amount) external {
        _requireOnlyValidSender();
        bool success = IERC20(tokenContract).transfer(recipient, amount);
        require(success, ERROR_WITHDRAW_UNSUCCESSFUL);
    }
    
    function withdrawERC721(address tokenContract, address recipient, uint256 tokenId) external {
        _requireOnlyValidSender();
        IERC721(tokenContract).safeTransferFrom(address(this), recipient, tokenId, "");
    }    
}

File 9 of 33 : Royalties.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./NiftyPermissions.sol";
import "../libraries/Clones.sol";
import "../interfaces/IERC20.sol";
import "../interfaces/IERC721.sol";
import "../interfaces/IERC2981.sol";
import "../interfaces/ICloneablePaymentSplitter.sol";
import "../structs/RoyaltyRecipient.sol";

abstract contract Royalties is NiftyPermissions, IERC2981 {

    event RoyaltyReceiverUpdated(uint256 indexed niftyType, address previousReceiver, address newReceiver);

    uint256 constant public BIPS_PERCENTAGE_TOTAL = 10000;

    // Royalty information mapped by nifty type
    mapping (uint256 => RoyaltyRecipient) internal royaltyRecipients;

    function supportsInterface(bytes4 interfaceId) public view virtual override(NiftyPermissions, IERC165) returns (bool) {
        return
            interfaceId == type(IERC2981).interfaceId ||            
            super.supportsInterface(interfaceId);
    }

    function getRoyaltySettings(uint256 niftyType) public view returns (RoyaltyRecipient memory) {
        return royaltyRecipients[niftyType];
    }
    
    function setRoyaltyBips(uint256 niftyType, uint256 bips) external {
        _requireOnlyValidSender();
        require(bips <= BIPS_PERCENTAGE_TOTAL, ERROR_BIPS_OVER_100_PERCENT);
        royaltyRecipients[niftyType].bips = uint16(bips);
    }
    
    function royaltyInfo(uint256 tokenId, uint256 salePrice) public virtual override view returns (address, uint256) {                        
        uint256 niftyType = _getNiftyType(tokenId); 
        return royaltyRecipients[niftyType].recipient == address(0) ? 
            (address(0), 0) :
            (royaltyRecipients[niftyType].recipient, (salePrice * royaltyRecipients[niftyType].bips) / BIPS_PERCENTAGE_TOTAL);
    }    

    function initializeRoyalties(uint256 niftyType, address splitterImplementation, address[] calldata payees, uint256[] calldata shares) external returns (address)  {
        _requireOnlyValidSender();        
        address previousReceiver = royaltyRecipients[niftyType].recipient;        
        royaltyRecipients[niftyType].isPaymentSplitter = payees.length > 1;
        royaltyRecipients[niftyType].recipient = payees.length == 1 ? payees[0] : _clonePaymentSplitter(splitterImplementation, payees, shares);        
        emit RoyaltyReceiverUpdated(niftyType, previousReceiver, royaltyRecipients[niftyType].recipient);                        
        return royaltyRecipients[niftyType].recipient;
    }      

    function getNiftyType(uint256 tokenId) public view returns (uint256) {
        return _getNiftyType(tokenId);
    }    

    function getPaymentSplitterByNiftyType(uint256 niftyType) public virtual view returns (address) {
        return _getPaymentSplitter(niftyType);
    }

    function getPaymentSplitterByTokenId(uint256 tokenId) public virtual view returns (address) {
        return _getPaymentSplitter(_getNiftyType(tokenId));
    }    

    function _getNiftyType(uint256 tokenId) internal virtual view returns (uint256) {        
        return 0;
    }

    function _clonePaymentSplitter(address splitterImplementation, address[] calldata payees, uint256[] calldata shares_) internal returns (address) {
        require(IERC165(splitterImplementation).supportsInterface(type(ICloneablePaymentSplitter).interfaceId), ERROR_UNCLONEABLE_REFERENCE_CONTRACT);
        address clone = payable (Clones.clone(splitterImplementation));
        ICloneablePaymentSplitter(clone).initialize(payees, shares_);            
        return clone;
    }

    function _getPaymentSplitter(uint256 niftyType) internal virtual view returns (address) {        
        return royaltyRecipients[niftyType].isPaymentSplitter ? royaltyRecipients[niftyType].recipient : address(0);        
    }
}

File 10 of 33 : ERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./ERC721Errors.sol";
import "../interfaces/IERC721.sol";
import "../interfaces/IERC721Receiver.sol";
import "../interfaces/IERC721Metadata.sol";
import "../interfaces/IERC721Cloneable.sol";
import "../libraries/Address.sol";
import "../libraries/Context.sol";
import "../libraries/Strings.sol";
import "../utils/ERC165.sol";
import "../utils/GenericErrors.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}.
 */
abstract contract ERC721 is Context, ERC165, ERC721Errors, GenericErrors, IERC721Metadata, IERC721Cloneable {
    using Address for address;
    using Strings for uint256;

    // Only allow ERC721 to be initialized once
    bool internal initializedERC721;

    // Token name
    string internal tokenName;

    // Token symbol
    string internal tokenSymbol;

    // Base URI For Offchain Metadata
    string internal baseMetadataURI; 

    // Mapping from token ID to owner address
    mapping(uint256 => address) internal owners;

    // Mapping owner address to token count
    mapping(address => uint256) internal balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) internal tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) internal operatorApprovals;    

    function initializeERC721(string memory name_, string memory symbol_, string memory baseURI_) public override {
        require(!initializedERC721, ERROR_REINITIALIZATION_NOT_PERMITTED);
        tokenName = name_;
        tokenSymbol = symbol_;
        _setBaseURI(baseURI_);
        initializedERC721 = true;
    }

    /**
     * @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 ||
            interfaceId == type(IERC721Cloneable).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */    
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), ERROR_QUERY_FOR_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), ERROR_QUERY_FOR_NONEXISTENT_TOKEN);
        return owner;
    }

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

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

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

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

    function baseURI() public view virtual returns (string memory) {
        return baseMetadataURI;
    }

    /**
     * @dev Internal function to set the base URI
     */
    function _setBaseURI(string memory uri) internal {
        baseMetadataURI = uri;        
    }

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

        require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()), ERROR_NOT_OWNER_NOR_APPROVED);

        _approve(owner, to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */    
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), ERROR_QUERY_FOR_NONEXISTENT_TOKEN);
        return tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */    
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), ERROR_APPROVE_TO_CALLER);
        operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);        
    }

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

    /**
     * @dev See {IERC721-transferFrom}.
     */    
    function transferFrom(address from, address to, uint256 tokenId) public virtual override {        
        (address owner, bool isApprovedOrOwner) = _isApprovedOrOwner(_msgSender(), tokenId);
        require(isApprovedOrOwner, ERROR_NOT_OWNER_NOR_APPROVED);
        _transfer(owner, 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 {
        transferFrom(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, data), ERROR_NOT_AN_ERC721_RECEIVER);
    }    

    /**
     * @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 (address owner, bool isApprovedOrOwner) {
        owner = owners[tokenId];
        require(owner != address(0), ERROR_QUERY_FOR_NONEXISTENT_TOKEN);
        isApprovedOrOwner = (spender == owner || tokenApprovals[tokenId] == spender || isApprovedForAll(owner, spender));
    }   
    
    /**
     * @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 = ownerOf(tokenId);
        bool isApprovedOrOwner = (_msgSender() == owner || tokenApprovals[tokenId] == _msgSender() || isApprovedForAll(owner, _msgSender()));
        require(isApprovedOrOwner, ERROR_NOT_OWNER_NOR_APPROVED);

        // Clear approvals        
        _clearApproval(owner, tokenId);

        balances[owner] -= 1;
        _clearOwnership(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 owner, address from, address to, uint256 tokenId) internal virtual {
        require(owner == from, ERROR_TRANSFER_FROM_INCORRECT_OWNER);
        require(to != address(0), ERROR_TRANSFER_TO_ZERO_ADDRESS);        

        // Clear approvals from the previous owner        
        _clearApproval(owner, tokenId);

        balances[from] -= 1;
        balances[to] += 1;
        _setOwnership(to, tokenId);
        
        emit Transfer(from, to, tokenId);        
    }

    /**
     * @dev Equivalent to approving address(0), but more gas efficient
     *
     * Emits a {Approval} event.
     */
    function _clearApproval(address owner, uint256 tokenId) internal virtual {
        delete tokenApprovals[tokenId];
        emit Approval(owner, address(0), tokenId);
    }

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

    function _clearOwnership(uint256 tokenId) internal virtual {
        delete owners[tokenId];
    }

    function _setOwnership(address to, uint256 tokenId) internal virtual {
        owners[tokenId] = to;
    }

    /**
     * @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
     *
     * @dev Slither identifies an issue with unused return value.
     * Reference: https://github.com/crytic/slither/wiki/Detector-Documentation#unused-return
     * This should be a non-issue.  It is the standard OpenZeppelin implementation which has been heavily used and audited.
     */     
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal 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(ERROR_NOT_AN_ERC721_RECEIVER);
                } else {                    
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }    
}

File 11 of 33 : ERC721Errors.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

abstract contract ERC721Errors {
    string internal constant ERROR_QUERY_FOR_ZERO_ADDRESS = "Query for zero address";
    string internal constant ERROR_QUERY_FOR_NONEXISTENT_TOKEN = "Token does not exist";
    string internal constant ERROR_APPROVAL_TO_CURRENT_OWNER = "Current owner approval";
    string internal constant ERROR_APPROVE_TO_CALLER = "Approve to caller";
    string internal constant ERROR_NOT_OWNER_NOR_APPROVED = "Not owner nor approved";
    string internal constant ERROR_NOT_AN_ERC721_RECEIVER = "Not an ERC721Receiver";
    string internal constant ERROR_TRANSFER_FROM_INCORRECT_OWNER = "Transfer from incorrect owner";
    string internal constant ERROR_TRANSFER_TO_ZERO_ADDRESS = "Transfer to zero address";    
    string internal constant ERROR_ALREADY_MINTED = "Token already minted";    
    string internal constant ERROR_NO_TOKENS_MINTED = "No tokens minted";    
}

File 12 of 33 : IERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./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 13 of 33 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

/**
 * @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 14 of 33 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

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 15 of 33 : IERC721Cloneable.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./IERC721.sol";

interface IERC721Cloneable is IERC721 {
    function initializeERC721(string calldata name_, string calldata symbol_, string calldata baseURI_) external;    
}

File 16 of 33 : Address.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

/**
 * @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

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

File 17 of 33 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

/**
 * @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 18 of 33 : Strings.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

/**
 * @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 19 of 33 : ERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "../interfaces/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 20 of 33 : GenericErrors.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

abstract contract GenericErrors {
    string internal constant ERROR_INPUT_ARRAY_EMPTY = "Input array empty";
    string internal constant ERROR_INPUT_ARRAY_SIZE_MISMATCH = "Input array size mismatch";
    string internal constant ERROR_INVALID_MSG_SENDER = "Invalid msg.sender";
    string internal constant ERROR_UNEXPECTED_DATA_SIGNER = "Unexpected data signer";
    string internal constant ERROR_INSUFFICIENT_BALANCE = "Insufficient balance";
    string internal constant ERROR_WITHDRAW_UNSUCCESSFUL = "Withdraw unsuccessful";
    string internal constant ERROR_CONTRACT_IS_FINALIZED = "Contract is finalized";
    string internal constant ERROR_CANNOT_CHANGE_DEFAULT_OWNER = "Cannot change default owner";
    string internal constant ERROR_UNCLONEABLE_REFERENCE_CONTRACT = "Uncloneable reference contract";
    string internal constant ERROR_BIPS_OVER_100_PERCENT = "Bips over 100%";
    string internal constant ERROR_NO_ROYALTY_RECEIVER = "No royalty receiver";
    string internal constant ERROR_REINITIALIZATION_NOT_PERMITTED = "Re-initialization not permitted";
    string internal constant ERROR_ZERO_ETH_TRANSFER = "Zero ETH Transfer";
}

File 21 of 33 : IERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

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

File 22 of 33 : NiftyPermissions.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./ERC165.sol";
import "./GenericErrors.sol";
import "../interfaces/INiftyEntityCloneable.sol";
import "../interfaces/INiftyRegistry.sol";
import "../libraries/Context.sol";

abstract contract NiftyPermissions is Context, ERC165, GenericErrors, INiftyEntityCloneable {    

    event AdminTransferred(address indexed previousAdmin, address indexed newAdmin);

    // Only allow Nifty Entity to be initialized once
    bool internal initializedNiftyEntity;

    // If address(0), use enable Nifty Gateway permissions - otherwise, specifies the address with permissions
    address public admin;

    // To prevent a mistake, transferring admin rights will be a two step process
    // First, the current admin nominates a new admin
    // Second, the nominee accepts admin
    address public nominatedAdmin;

    // Nifty Registry Contract
    INiftyRegistry internal permissionsRegistry;    

    function initializeNiftyEntity(address niftyRegistryContract_) public {
        require(!initializedNiftyEntity, ERROR_REINITIALIZATION_NOT_PERMITTED);
        permissionsRegistry = INiftyRegistry(niftyRegistryContract_);
        initializedNiftyEntity = true;
    }       
    
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return         
        interfaceId == type(INiftyEntityCloneable).interfaceId ||
        super.supportsInterface(interfaceId);
    }        

    function renounceAdmin() external {
        _requireOnlyValidSender();
        _transferAdmin(address(0));
    }    

    function nominateAdmin(address nominee) external {
        _requireOnlyValidSender();
        nominatedAdmin = nominee;
    }

    function acceptAdmin() external {
        address nominee = nominatedAdmin;
        require(_msgSender() == nominee, ERROR_INVALID_MSG_SENDER);
        _transferAdmin(nominee);
    }
    
    function _requireOnlyValidSender() internal view {       
        address currentAdmin = admin;     
        if(currentAdmin == address(0)) {
            require(permissionsRegistry.isValidNiftySender(_msgSender()), ERROR_INVALID_MSG_SENDER);
        } else {
            require(_msgSender() == currentAdmin, ERROR_INVALID_MSG_SENDER);
        }
    }        

    function _transferAdmin(address newAdmin) internal {
        address oldAdmin = admin;
        admin = newAdmin;
        delete nominatedAdmin;        
        emit AdminTransferred(oldAdmin, newAdmin);
    }
}

File 23 of 33 : ECDSA.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/ECDSA.sol)

pragma solidity 0.8.9;

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 24 of 33 : SignatureStatus.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

struct SignatureStatus {
    bool isSalted;
    bool isVerified;
    address signer;
    bytes32 saltedHash;
}

File 25 of 33 : INiftyEntityCloneable.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./IERC165.sol";

interface INiftyEntityCloneable is IERC165 {
    function initializeNiftyEntity(address niftyRegistryContract_) external;
}

File 26 of 33 : INiftyRegistry.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

interface INiftyRegistry {
   function isValidNiftySender(address sendingKey) external view returns (bool);
}

File 27 of 33 : RejectEther.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

/**
 * @title A base contract that may be inherited in order to protect a contract from having its fallback function 
 * invoked and to block the receipt of ETH by a contract.
 * @author Nathan Gang
 * @notice This contract bestows on inheritors the ability to block ETH transfers into the contract
 * @dev ETH may still be forced into the contract - it is impossible to block certain attacks, but this protects from accidental ETH deposits
 */
 // For more info, see: "https://medium.com/@alexsherbuck/two-ways-to-force-ether-into-a-contract-1543c1311c56"
abstract contract RejectEther {    

    /**
     * @dev For most contracts, it is safest to explicitly restrict the use of the fallback function
     * This would generally be invoked if sending ETH to this contract with a 'data' value provided
     */
    fallback() external payable {        
        revert("Fallback function not permitted");
    }

    /**
     * @dev This is the standard path where ETH would land if sending ETH to this contract without a 'data' value
     * In our case, we don't want our contract to receive ETH, so we restrict it here
     */
    receive() external payable {
        revert("Receiving ETH not permitted");
    }    
}

File 28 of 33 : IERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

File 29 of 33 : Clones.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

/**
 * @dev https://eips.ethereum.org/EIPS/eip-1167[EIP 1167] is a standard for
 * deploying minimal proxy contracts, also known as "clones".
 *
 * > To simply and cheaply clone contract functionality in an immutable way, this standard specifies
 * > a minimal bytecode implementation that delegates all calls to a known, fixed address.
 *
 * The library includes functions to deploy a proxy using either `create` (traditional deployment) or `create2`
 * (salted deterministic deployment). It also includes functions to predict the addresses of clones deployed using the
 * deterministic method.
 *
 */
library Clones {
    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create opcode, which should never revert.
     */
    function clone(address implementation) internal returns (address instance) {
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
            mstore(add(ptr, 0x14), shl(0x60, implementation))
            mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
            instance := create(0, ptr, 0x37)
        }
        require(instance != address(0), "ERC1167: create failed");
    }

    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create2 opcode and a `salt` to deterministically deploy
     * the clone. Using the same `implementation` and `salt` multiple time will revert, since
     * the clones cannot be deployed twice at the same address.
     */
    function cloneDeterministic(address implementation, bytes32 salt) internal returns (address instance) {
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
            mstore(add(ptr, 0x14), shl(0x60, implementation))
            mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
            instance := create2(0, ptr, 0x37, salt)
        }
        require(instance != address(0), "ERC1167: create2 failed");
    }

    /**
     * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
     */
    function predictDeterministicAddress(
        address implementation,
        bytes32 salt,
        address deployer
    ) internal pure returns (address predicted) {
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
            mstore(add(ptr, 0x14), shl(0x60, implementation))
            mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf3ff00000000000000000000000000000000)
            mstore(add(ptr, 0x38), shl(0x60, deployer))
            mstore(add(ptr, 0x4c), salt)
            mstore(add(ptr, 0x6c), keccak256(ptr, 0x37))
            predicted := keccak256(add(ptr, 0x37), 0x55)
        }
    }

    /**
     * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
     */
    function predictDeterministicAddress(address implementation, bytes32 salt)
        internal
        view
        returns (address predicted)
    {
        return predictDeterministicAddress(implementation, salt, address(this));
    }
}

File 30 of 33 : IERC2981.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./IERC165.sol";

/**
 * @dev Interface for the NFT Royalty Standard.
 *
 * A standardized way to retrieve royalty payment information for non-fungible tokens (NFTs) to enable universal
 * support for royalty payments across all NFT marketplaces and ecosystem participants.
 *
 */
interface IERC2981 is IERC165 {
    /**
     * @dev Returns how much royalty is owed and to whom, based on a sale price that may be denominated in any unit of
     * exchange. The royalty amount is denominated and should be payed in that same unit of exchange.
     */
    function royaltyInfo(uint256 tokenId, uint256 salePrice)
        external
        view
        returns (address receiver, uint256 royaltyAmount);
}

File 31 of 33 : ICloneablePaymentSplitter.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./IERC165.sol";
import "../libraries/SafeERC20.sol";

interface ICloneablePaymentSplitter is IERC165 {
    
    event PayeeAdded(address account, uint256 shares);
    event PaymentReleased(address to, uint256 amount);
    event ERC20PaymentReleased(IERC20 indexed token, address to, uint256 amount);
    event PaymentReceived(address from, uint256 amount);
    
    function initialize(address[] calldata payees, uint256[] calldata shares_) external;        
    function totalShares() external view returns (uint256);    
    function totalReleased() external view returns (uint256);
    function totalReleased(IERC20 token) external view returns (uint256);
    function shares(address account) external view returns (uint256);    
    function released(address account) external view returns (uint256);
    function released(IERC20 token, address account) external view returns (uint256);
    function payee(uint256 index) external view returns (address);    
    function release(address payable account) external;
    function release(IERC20 token, address account) external;
    function pendingPayment(address account) external view returns (uint256);
    function pendingPayment(IERC20 token, address account) external view returns (uint256);
}

File 32 of 33 : RoyaltyRecipient.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

struct RoyaltyRecipient {
    bool isPaymentSplitter; // 1 byte
    uint16 bips; // 2 bytes
    address recipient; // 20 bytes
}

File 33 of 33 : SafeERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "../interfaces/IERC20.sol";
import "./Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 1500
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract ABI

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A token is a representation of an on-chain or off-chain asset. The token page shows information such as price, total supply, holders, transfers and social links. Learn more about this page in our Knowledge Base.