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0xb4a7d131436ed8EC06aD696FA3BF8d23C0aB3Acf
 

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TokenTracker

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Set Approval For...208489812024-09-28 11:57:3512 hrs ago1727524655IN
Mongs: MONG Token
0 ETH0.000291856.31702001
Transfer From208470622024-09-28 5:32:4719 hrs ago1727501567IN
Mongs: MONG Token
0 ETH0.000382758.04890741
Transfer From208470592024-09-28 5:32:1119 hrs ago1727501531IN
Mongs: MONG Token
0 ETH0.000380998.01177105
Transfer From208470552024-09-28 5:31:2319 hrs ago1727501483IN
Mongs: MONG Token
0 ETH0.000392918.26251132
Transfer From208468752024-09-28 4:54:4719 hrs ago1727499287IN
Mongs: MONG Token
0 ETH0.000361097.59334846
Transfer From208468712024-09-28 4:53:5919 hrs ago1727499239IN
Mongs: MONG Token
0 ETH0.000344957.25400335
Transfer From208468452024-09-28 4:48:4719 hrs ago1727498927IN
Mongs: MONG Token
0 ETH0.000500457.74046518
Set Approval For...208393272024-09-27 3:39:4744 hrs ago1727408387IN
Mongs: MONG Token
0 ETH0.0006068913.13572534
Set Approval For...208378242024-09-26 22:37:592 days ago1727390279IN
Mongs: MONG Token
0 ETH0.0005900712.74856233
Set Approval For...208378222024-09-26 22:37:352 days ago1727390255IN
Mongs: MONG Token
0 ETH0.0006519414.11068595
Safe Transfer Fr...208371522024-09-26 20:22:112 days ago1727382131IN
Mongs: MONG Token
0 ETH0.0013004328.4734604
Set Approval For...208351032024-09-26 13:31:112 days ago1727357471IN
Mongs: MONG Token
0 ETH0.0016152534.89736755
Set Approval For...208331902024-09-26 7:07:472 days ago1727334467IN
Mongs: MONG Token
0 ETH0.0016938636.66217442
Set Approval For...208327322024-09-26 5:35:472 days ago1727328947IN
Mongs: MONG Token
0 ETH0.0006450713.96204498
Set Approval For...208086812024-09-22 21:03:116 days ago1727038991IN
Mongs: MONG Token
0 ETH0.000493510.68153157
Set Approval For...207722102024-09-17 18:47:3511 days ago1726598855IN
Mongs: MONG Token
0 ETH0.000671814.54059363
Safe Transfer Fr...207692412024-09-17 8:49:3511 days ago1726562975IN
Mongs: MONG Token
0 ETH0.00009542.08778462
Safe Transfer Fr...207600792024-09-16 2:03:2312 days ago1726452203IN
Mongs: MONG Token
0 ETH0.000143572.12408645
Set Approval For...207243392024-09-11 2:18:4717 days ago1726021127IN
Mongs: MONG Token
0 ETH0.000180253.90144985
Set Approval For...207027762024-09-08 2:02:2320 days ago1725760943IN
Mongs: MONG Token
0 ETH0.000059911.29622353
Set Approval For...207027712024-09-08 2:01:2320 days ago1725760883IN
Mongs: MONG Token
0 ETH0.000062681.35421894
Safe Transfer Fr...206768152024-09-04 11:07:1124 days ago1725448031IN
Mongs: MONG Token
0 ETH0.000261213.8643784
Transfer From206698932024-09-03 11:56:3525 days ago1725364595IN
Mongs: MONG Token
0 ETH0.00013093.06179554
Safe Transfer Fr...206666492024-09-03 1:04:4725 days ago1725325487IN
Mongs: MONG Token
0 ETH0.000106411.57431967
Set Approval For...206645062024-09-02 17:54:3526 days ago1725299675IN
Mongs: MONG Token
0 ETH0.0004793210.37461448
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139738082022-01-09 21:39:01993 days ago1641764341
Mongs: MONG Token
193.38 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
MongsToken

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
Yes with 300 runs

Other Settings:
default evmVersion
File 1 of 15 : MongsToken.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Pausable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";

contract OwnableDelegateProxy {}

contract ProxyRegistry {
    mapping(address => OwnableDelegateProxy) public proxies;
}

contract MongsToken is
    Context,
    Ownable,
    ERC721Burnable,
    ERC721Pausable
{
    using Strings for uint256;
    event Blend(address indexed operator, uint256 indexed tokenId, uint256 indexed burnTokenId);

    struct WhitelistSettings {
        uint256[] startTime;
        uint256[] limitPerAddress;        
        uint256[] whitelistIds;
    }

    uint24 private constant PROJECT_SCALE = 1e6;
    uint24 private constant MAX_MINT_ID = 999999;

    string private _baseTokenURI;
    string private _contractURI;
    address private _proxyRegistryAddress;

    address private _payoutAddress;
    uint256 private _projectFee;
    uint256 private _supplyTracker;

    // Mapping from address to balance
    mapping(address => uint256) private _balances;

    // Mapping from project id to current mint number
    mapping(uint256 => uint256) private _projectMints;

    // Mapping from project id to project upgrades
    mapping(uint256 => string) private _projectURIs;

    // Mapping from project id to address or token
    mapping(uint256 => mapping(address => uint256)) private _addressClaims;
    mapping(uint256 => mapping(uint256 => uint256)) private _tokenClaims;

    // Mapping to nonce used
    mapping(uint256 => mapping(uint256 => bool)) private _nonces;

    // Mapping from project id to project settings
    mapping(uint256 => address) public _projectOwner;
    
    // Mapping from project id to project settings
    mapping(uint256 => uint256) private _projectSettings;

    // Mapping from project id to project upgrades
    mapping(uint256 => uint256) private _projectUpgrades;

    // Mapping from project id to project blends
    mapping(uint256 => uint256) private _projectBlends;

    // Mapping from project id to project perks
    mapping(uint256 => mapping(uint256 => uint256)) private _projectPerks;

    // Mapping from whitelist id to address approved
    mapping(uint256 => mapping(address => bool)) private _whitelist;

    // Mapping from project id whitelist array
    mapping(uint256 => WhitelistSettings) private _projectWhitelist;

    constructor(
        string memory name,
        string memory symbol,
        string memory baseTokenURI,
        string memory initContractURI,
        address payoutAddress,
        address proxyAddress
    ) ERC721(name, symbol) {
        _proxyRegistryAddress = proxyAddress;
        _baseTokenURI = baseTokenURI;
        _contractURI = initContractURI;
        _payoutAddress = payoutAddress;
        _projectFee = 100;        
    }

    //view functions
    function balance(address owner) public view returns (uint256) {
        return _balances[owner];
    }

    function totalSupply() public view returns (uint256) {
        return _supplyTracker;
    }

    function contractURI() public view returns (string memory) {
        return _contractURI;
    }

    function projectSupply(uint256 projectId) public view returns (uint256) {
        return _projectMints[projectId];
    }

    function addressClaims(address owner, uint256 projectId) public view returns(uint256) {
        return _addressClaims[projectId][owner];
    }

    function tokenClaims(uint256 tokenId, uint256 projectId) public view returns(uint256) {
        return _tokenClaims[projectId][tokenId];
    }

    function projectSettings(uint256 projectId) public view returns (
        uint256 maxSupply,
        uint256 costEach,
        uint256 startTime, 
        uint256 limitPerTx, 
        uint256 limitPerAddress
    ) {
        uint256 settings = _projectSettings[projectId];
        maxSupply = uint256(uint64(settings));
        costEach = uint256(uint64(settings>>64));
        startTime = uint256(uint64(settings>>128));
        limitPerTx = uint256(uint32(settings>>192));
        limitPerAddress = uint256(uint32(settings>>224));
    }

    function projectPerks(uint256 projectId, uint256 perkProjectId) public view returns (        
        uint256 costEach,
        uint256 startTime, 
        uint256 limitPerTx, 
        uint256 limitPerAddress,
        uint256 limitPerToken
    ) {
        uint256 settings = _projectPerks[projectId][perkProjectId];
        costEach = uint256(uint64(settings));
        startTime = uint256(uint64(settings>>64));
        limitPerTx = uint256(uint64(settings>>128));
        limitPerAddress = uint256(uint32(settings>>192));
        limitPerToken = uint256(uint32(settings>>224));
    }

    function projectUpgrades(uint256 projectId) public view returns (        
        uint256 outputProjectId,
        uint256 inputQuantity
    ) {
        uint256 settings = _projectUpgrades[projectId];
        outputProjectId = uint256(uint128(settings));
        inputQuantity = uint256(uint128(settings>>128));
    }

    function projectBlends(uint256 projectId) public view returns (        
        uint256 burnProjectId
    ) {
        burnProjectId = _projectBlends[projectId];
    }

    function checkSignature(
        uint256 projectId, 
        uint256 nonce, 
        bytes memory signature
    ) public view returns (
        uint256 maxSupply
    ) {
        address signer = ECDSA.recover(ECDSA.toEthSignedMessageHash(keccak256(abi.encode(projectId,nonce))), signature);
        require(signer == _projectOwner[projectId], "BADSIG");
        (maxSupply, , , , ) = projectSettings(projectId); 
    }

    function checkWhitelist(address owner, uint256 whitelistId) public view returns (
        bool approved
    ) {
        approved = _whitelist[whitelistId][owner];
    }

    function checkProjectWhitelist(uint256 projectId) public view returns (
        uint256[] memory startTime,
        uint256[] memory limitPerAddress,        
        uint256[] memory whitelistIds
    ) {
        startTime = _projectWhitelist[projectId].startTime;
        limitPerAddress = _projectWhitelist[projectId].limitPerAddress;
        whitelistIds = _projectWhitelist[projectId].whitelistIds;
    }

    //admin functions 

    function setProxy(address proxyRegistryAddress) public onlyOwner {
        _proxyRegistryAddress = proxyRegistryAddress;
    }

    function setProjectFee(uint256 projectFee) public onlyOwner {
        _projectFee = projectFee;
    } 
    
    function setPayoutAddress(address payoutAddress) public onlyOwner {
        _payoutAddress = payoutAddress;
    }   

    function setContractURI(string memory initContractURI) public onlyOwner {
        _contractURI = initContractURI;
    } 

    function setProjectURI(uint256 projectId, string memory projectURI) public onlyOwner {
        _projectURIs[projectId] = projectURI;
    } 

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

    function addProject(address owner, uint256 projectId) public onlyOwner {
        _projectOwner[projectId] = owner;
    }

    function transferProject(address newOwner, uint256 projectId) public {
        require(_projectOwner[projectId] == _msgSender(), "NOTOWNER");
        _projectOwner[projectId] = newOwner;
    }

    function configProject(
        uint256 projectId,
        uint256 maxSupply,
        uint256 costEach,
        uint256 startTime, 
        uint256 limitPerTx, 
        uint256 limitPerAddress
    ) public {
        require(_projectOwner[projectId] == _msgSender(), "NOTOWNER");        
        require(maxSupply > 0 && maxSupply <= MAX_MINT_ID, "SUPPLY");
        require(costEach <= 18 ether, "COST");
        require(startTime < 2e64 && limitPerTx < 2e32 && limitPerAddress < 2e32, "OOB");

        uint256 settings = maxSupply;
        settings |= costEach<<64;
        settings |= startTime<<128;
        settings |= limitPerTx<<192;
        settings |= limitPerAddress<<224;
        _projectSettings[projectId] = settings;
    }

    function configPerk(
        uint256 projectId,
        uint256 perkProjectId,
        uint256 costEach,
        uint256 startTime,
        uint256 limitPerTx,
        uint256 limitPerAddress,
        uint256 limitPerToken       
    ) public {
        require(_projectOwner[projectId] == _msgSender(), "NOTOWNER");
        require(_projectOwner[perkProjectId] != address(0), "NOPERK");
        require(costEach <= 18 ether, "COST");
        require(startTime < 2e64 && limitPerTx < 2e32 && limitPerAddress < 2e32 && limitPerToken < 2e32, "OOB");

        uint256 settings = costEach;
        settings |= startTime<<64;
        settings |= limitPerTx<<128;
        settings |= limitPerAddress<<192;
        settings |= limitPerToken<<224;
        _projectPerks[projectId][perkProjectId] = settings;  
    }

    function configUpgrade(
        uint256 projectId,
        uint256 outputProjectId,
        uint256 quantity       
    ) public {
        require(_projectOwner[projectId] == _msgSender(), "NOTOWNER");
        require(_projectOwner[outputProjectId] == _msgSender(), "NOTOWNER");

        uint256 settings = outputProjectId;
        settings |= quantity<<128;
        _projectUpgrades[projectId] = settings;  
    }

    function configBlend(
        uint256 projectId,
        uint256 burnProjectId      
    ) public {
        require(_projectOwner[projectId] == _msgSender(), "NOTOWNER");
        _projectBlends[projectId] = burnProjectId;  
    }

    function pushWhitelist(uint256 whitelistId, address[] memory addresses) public onlyOwner {
        for (uint256 i = 0; i < addresses.length; ++i) {
            _whitelist[whitelistId][addresses[i]] = true;
        }
    }

    function popWhitelist(uint256 whitelistId, address[] memory addresses) public onlyOwner {
        for (uint256 i = 0; i < addresses.length; ++i) {
            delete _whitelist[whitelistId][addresses[i]];
        }
    }

    function configWhitelist(uint256 projectId, uint256[] memory startTime, uint256[] memory limitPerAddress, uint256[] memory whitelistIds) public onlyOwner {
        require(startTime.length == limitPerAddress.length, "LENGTH");
        require(limitPerAddress.length == whitelistIds.length, "LENGTH");
        _projectWhitelist[projectId] = WhitelistSettings(startTime, limitPerAddress, whitelistIds);
    }

    //user functions

    function withdraw(address payable account) public {
        require(account == _msgSender(), "AUTH");
        uint256 payment = _balances[account]; 
        require(payment > 0, "NOFUNDS"); 
        _balances[account] = 0;
        Address.sendValue(account, payment);
    }

    function mint(address to, uint256 projectId, uint256 quantity) public payable {
        address owner;
        uint256 maxSupply;
        uint256 totalCost;
        uint256 limitPerAddress;
        (owner, maxSupply, totalCost, limitPerAddress) = _checkProject(_msgSender(), projectId, quantity);
        _internalMint(owner,to,projectId,maxSupply,totalCost,quantity,limitPerAddress);
    }

    function mintWhitelist(address to, uint256 projectId, uint256 quantity) external {
        uint256 maxSupply;
        uint256 mints = _projectMints[projectId];
        (maxSupply, , , , ) = projectSettings(projectId);

        bool eligible = false;
        for (uint256 i = 0; i < _projectWhitelist[projectId].whitelistIds.length; ++i) {
            if(_whitelist[_projectWhitelist[projectId].whitelistIds[i]][_msgSender()]) {
                eligible = true;

                if(_projectWhitelist[projectId].limitPerAddress[i] > 0) {
                    require(_addressClaims[projectId][_msgSender()] + quantity <= _projectWhitelist[projectId].limitPerAddress[i], "ADDRESS LIMIT");
                    _addressClaims[projectId][_msgSender()] += quantity;
                }

                if(_projectWhitelist[projectId].startTime[i] > 0) {
                    require(_projectWhitelist[projectId].startTime[i] <= block.timestamp, "TOO EARLY");
                }

                break;
            }
        }
        
        require(eligible, "NOTWHITELISTED");
        require(mints + quantity <= maxSupply, "COMPLETE");

        _projectMints[projectId] += quantity;
        _supplyTracker += quantity;

        for (uint256 i = 0; i < quantity; ++i) {
            _safeMint(to, (projectId * PROJECT_SCALE) + mints + i + 1);
        }    
    }

    function promo(address to, uint256 projectId, uint256 claimId, bytes memory signature) external {
        require(_nonces[projectId][claimId] == false, "CLAIMED");
        uint256 maxSupply = checkSignature(projectId, claimId, signature);
        uint256 mintNumber = _projectMints[projectId] + 1;
        require(mintNumber <= maxSupply, "COMPLETE");
        _projectMints[projectId] += 1;
        _supplyTracker += 1;
        _nonces[projectId][claimId] = true;
        _safeMint(to, (projectId * PROJECT_SCALE) + mintNumber);
    }

    function claim(address to, uint256 projectId, uint256 quantity, uint256 tokenId) public payable {
        address owner;
        uint256 maxSupply;
        uint256 totalCost;
        uint256 limitPerAddress;
        uint256 limitPerToken;
        uint256 perkProjectId = tokenId / PROJECT_SCALE;

        require(ERC721.ownerOf(tokenId) == _msgSender(), "TOKENID");

        (owner, maxSupply, totalCost, limitPerAddress, limitPerToken) = _checkPerk(projectId, perkProjectId, quantity);
        
        if(limitPerToken > 0) {
            require(_tokenClaims[projectId][tokenId] + quantity <= limitPerToken, "TOKEN LIMIT");
            _tokenClaims[projectId][tokenId] += quantity;
        }

        _internalMint(owner,to,projectId,maxSupply,totalCost,quantity,limitPerAddress);
    }

    function upgrade(address to, uint256[] memory tokenIds) public {
        require(tokenIds.length > 0, "NOTOKENS");
        uint256 maxSupply;
        uint256 outputProjectId;
        uint256 projectId = tokenIds[0] / PROJECT_SCALE;
        (maxSupply, outputProjectId) = _checkUpgrade(projectId, tokenIds.length);

        for (uint256 i = 0; i < tokenIds.length; ++i) {
            require((tokenIds[i] / PROJECT_SCALE) == projectId, "NOTMATCH");
            burn(tokenIds[i]);
        }

        uint256 mintNumber = _projectMints[outputProjectId] + 1;
        require(mintNumber <= maxSupply, "COMPLETE");
        _projectMints[outputProjectId] += 1;
        _supplyTracker += 1;
        _safeMint(to, (outputProjectId * PROJECT_SCALE) + mintNumber);
    }

    function blend(uint256 tokenId, uint256 burnTokenId) public {
        uint256 projectId = tokenId / PROJECT_SCALE;
        uint256 burnProjectId = burnTokenId / PROJECT_SCALE;
        uint256 compareProjectId = _projectBlends[projectId];
        require(burnProjectId == compareProjectId, "INVALID");
        require(ERC721.ownerOf(tokenId) == _msgSender(), "TOKENID");
        burn(burnTokenId);
        emit Blend(_msgSender(), tokenId, burnTokenId);
    }
    
    function pause() public onlyOwner {
        _pause();
    }
    
    function unpause() public onlyOwner {
        _unpause();
    }

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

    function tokenURI(uint256 tokenId)
        public
        view
        override(ERC721)
        returns (string memory)
    {
        require(_exists(tokenId), "NOTOKEN");
        uint256 projectId = tokenId / PROJECT_SCALE;        
        string memory _projectURI = _projectURIs[projectId];

        if (bytes(_projectURI).length > 0) {
            return string(abi.encodePacked(_projectURI, tokenId.toString()));
        }

        return super.tokenURI(tokenId);
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override(ERC721, ERC721Pausable) {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(ERC721)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }

    /**
     * Override isApprovedForAll to whitelist user's OpenSea proxy accounts to enable gas-less listings.
     */
    function isApprovedForAll(address owner, address operator)
        override
        public
        view
        returns (bool)
    {
        // Whitelist OpenSea proxy contract for easy trading.
        if(_proxyRegistryAddress != address(0)) {
            ProxyRegistry proxyRegistry = ProxyRegistry(_proxyRegistryAddress);
            if (address(proxyRegistry.proxies(owner)) == operator) {
                return true;
            }
        }

        return super.isApprovedForAll(owner, operator);
    }

    //internal functions

    function _internalMint(
        address projectOwner,
        address destination,
        uint256 projectId,
        uint256 maxSupply,
        uint256 totalCost,
        uint256 quantity,
        uint256 limitPerAddress
    ) internal {
        if(projectOwner != _msgSender()) {
            require(totalCost == msg.value, "FUNDS");        

            if(limitPerAddress > 0) {
                require(_addressClaims[projectId][_msgSender()] + quantity <= limitPerAddress, "ADDRESS LIMIT");
                _addressClaims[projectId][_msgSender()] += quantity;
            }

            uint256 projectFee = (msg.value * _projectFee) / 1000;
            uint256 projectPayout = msg.value - projectFee;

            _balances[_payoutAddress] += projectFee;        
            _balances[projectOwner] += projectPayout;
        }        

        uint256 mints = _projectMints[projectId];
        require(mints + quantity <= maxSupply, "COMPLETE");

        _projectMints[projectId] += quantity;
        _supplyTracker += quantity;

        for (uint256 i = 0; i < quantity; ++i) {
            _safeMint(destination, (projectId * PROJECT_SCALE) + mints + i + 1);
        }    
    }

    function _checkProject(address operator, uint256 projectId, uint256 quantity) internal view returns (
        address owner,
        uint256 maxSupply,
        uint256 totalCost,
        uint256 limitPerAddress
    ) {        
        uint256 costEach;
        uint256 startTime;
        uint256 limitPerTx;
        (maxSupply, costEach, startTime, limitPerTx, limitPerAddress) = projectSettings(projectId);
        owner = _projectOwner[projectId];

        if(operator != owner) {
            require(startTime > 0, "DISABLED");
            require(startTime <= block.timestamp, "TOO EARLY");
            require(quantity <= limitPerTx, "TX LIMIT");
        }
        
        totalCost = quantity * costEach;        
    }

    function _checkPerk(uint256 projectId, uint256 perkProjectId, uint256 quantity) internal view returns (
        address owner,
        uint256 maxSupply,
        uint256 totalCost,
        uint256 limitPerAddress,
        uint256 limitPerToken
    ) {        
        uint256 costEach;
        uint256 startTime;
        uint256 limitPerTx;
        (maxSupply, , , , ) = projectSettings(projectId);
        (costEach, startTime, limitPerTx, limitPerAddress, limitPerToken) = projectPerks(projectId, perkProjectId);
        require(startTime > 0, "DISABLED");
        require(startTime <= block.timestamp, "TOO EARLY");
        require(quantity <= limitPerTx, "TX LIMIT");
        totalCost = quantity * costEach;
        owner = _projectOwner[projectId];
    }

    function _checkUpgrade(uint256 projectId, uint256 quantity) internal view returns (
        uint256 maxSupply,
        uint256 outputProjectId
    ) {        
        uint256 inputQuantity;
        (outputProjectId, inputQuantity) = projectUpgrades(projectId);
        (maxSupply, , , , ) = projectSettings(outputProjectId);  
        require(inputQuantity > 0, "DISABLED");      
        require(quantity == inputQuantity, "QUANTITY");
    }

    

}

File 2 of 15 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

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

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

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

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

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

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

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

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

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

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

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

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

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

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

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

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

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

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

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

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

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

        _transfer(from, to, tokenId);
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _beforeTokenTransfer(from, to, tokenId);

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

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

        emit Transfer(from, to, tokenId);
    }

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

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

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

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

File 3 of 15 : ERC721Burnable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Burnable.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "../../../utils/Context.sol";

/**
 * @title ERC721 Burnable Token
 * @dev ERC721 Token that can be irreversibly burned (destroyed).
 */
abstract contract ERC721Burnable is Context, ERC721 {
    /**
     * @dev Burns `tokenId`. See {ERC721-_burn}.
     *
     * Requirements:
     *
     * - The caller must own `tokenId` or be an approved operator.
     */
    function burn(uint256 tokenId) public virtual {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721Burnable: caller is not owner nor approved");
        _burn(tokenId);
    }
}

File 4 of 15 : ERC721Pausable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Pausable.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "../../../security/Pausable.sol";

/**
 * @dev ERC721 token with pausable token transfers, minting and burning.
 *
 * Useful for scenarios such as preventing trades until the end of an evaluation
 * period, or having an emergency switch for freezing all token transfers in the
 * event of a large bug.
 */
abstract contract ERC721Pausable is ERC721, Pausable {
    /**
     * @dev See {ERC721-_beforeTokenTransfer}.
     *
     * Requirements:
     *
     * - the contract must not be paused.
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        require(!paused(), "ERC721Pausable: token transfer while paused");
    }
}

File 5 of 15 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

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

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

File 6 of 15 : 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 7 of 15 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

File 8 of 15 : ECDSA.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

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

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

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

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

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

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

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

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

        return (signer, RecoverError.NoError);
    }

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

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

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

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

File 9 of 15 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

File 10 of 15 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

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

File 11 of 15 : 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 12 of 15 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

File 13 of 15 : 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 14 of 15 : 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);
}

File 15 of 15 : Pausable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 300
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"string","name":"symbol","type":"string"},{"internalType":"string","name":"baseTokenURI","type":"string"},{"internalType":"string","name":"initContractURI","type":"string"},{"internalType":"address","name":"payoutAddress","type":"address"},{"internalType":"address","name":"proxyAddress","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"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":"operator","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"burnTokenId","type":"uint256"}],"name":"Blend","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":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","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"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"_projectOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"projectId","type":"uint256"}],"name":"addProject","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"projectId","type":"uint256"}],"name":"addressClaims","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","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":"balance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","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"},{"internalType":"uint256","name":"burnTokenId","type":"uint256"}],"name":"blend","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"projectId","type":"uint256"}],"name":"checkProjectWhitelist","outputs":[{"internalType":"uint256[]","name":"startTime","type":"uint256[]"},{"internalType":"uint256[]","name":"limitPerAddress","type":"uint256[]"},{"internalType":"uint256[]","name":"whitelistIds","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"projectId","type":"uint256"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"checkSignature","outputs":[{"internalType":"uint256","name":"maxSupply","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"whitelistId","type":"uint256"}],"name":"checkWhitelist","outputs":[{"internalType":"bool","name":"approved","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"projectId","type":"uint256"},{"internalType":"uint256","name":"quantity","type":"uint256"},{"internalType":"uint256","name":"tokenId","type":"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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

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

-----Decoded View---------------
Arg [0] : name (string): MONGS
Arg [1] : symbol (string): MONG
Arg [2] : baseTokenURI (string): https://meta.mongs.io/token/
Arg [3] : initContractURI (string): https://meta.mongs.io/contract
Arg [4] : payoutAddress (address): 0x02e4B80Ad58de2CDB32Db1afdF9eEd888cF3B92e
Arg [5] : proxyAddress (address): 0xa5409ec958C83C3f309868babACA7c86DCB077c1

-----Encoded View---------------
14 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000100
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000140
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000180
Arg [4] : 00000000000000000000000002e4b80ad58de2cdb32db1afdf9eed888cf3b92e
Arg [5] : 000000000000000000000000a5409ec958c83c3f309868babaca7c86dcb077c1
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [7] : 4d4f4e4753000000000000000000000000000000000000000000000000000000
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [9] : 4d4f4e4700000000000000000000000000000000000000000000000000000000
Arg [10] : 000000000000000000000000000000000000000000000000000000000000001c
Arg [11] : 68747470733a2f2f6d6574612e6d6f6e67732e696f2f746f6b656e2f00000000
Arg [12] : 000000000000000000000000000000000000000000000000000000000000001e
Arg [13] : 68747470733a2f2f6d6574612e6d6f6e67732e696f2f636f6e74726163740000


Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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OVERVIEW

MONGS are a culture, a vibe.They believe that somehow this is new, and hip, and an attack on the powers of society.

Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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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.