ETH Price: $3,392.80 (+1.39%)

Pi Protocol - ETH Silver (PiSilver)
 

Overview

TokenID

19

Total Transfers

-

Market

Onchain Market Cap

$0.00

Circulating Supply Market Cap

-

Other Info

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Contract Source Code Verified (Exact Match)

Contract Name:
NFTSales

Compiler Version
v0.8.11+commit.d7f03943

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 14 : NFTSales.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.11;

import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "./ERC721Min.sol";

contract OwnableDelegateProxy {}

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

contract NFTSales is Ownable, ERC721Min, ReentrancyGuard {
    using Strings for uint256;
    using SafeERC20 for IERC20;

    address public immutable proxyRegistryAddress; // opensea proxy
    mapping(address => bool) proxyToApproved; // proxy allowance for interaction with future contract
    string private _contractURI;
    string private _tokenBaseURI = ""; // SET TO THE METADATA URI
    address public treasuryAddress; 
    bool public useBaseUriOnly = true;
    mapping(uint256 => string) public TokenURIMap; // allows for assigning individual/unique metada per token

    uint16 public maxPerAddress;
    uint16 public maxPerMint;
    uint16 maxPerAddressForThree;
    uint16 maxMint;
    uint16 public maxMintForOne;
    uint16 maxMintForThree;
    bool public saleActive;
    uint256 public price;
    uint256 priceForThree;
    //string uri; 

    address public paymentToken;
    uint256 public priceWithToken;
    uint256 public priceForThreeWithToken;

    bool public disableSalesWithETH;
    bool public disableSalesWithToken;

    struct FeeRecipient {
        address recipient;
        uint256 basisPoints;
    }

    mapping(uint256 => FeeRecipient) public FeeRecipients;
    uint256 feeRecipientCount;
    uint256 totalFeeBasisPoints;
    bool public transferDisabled;

    constructor(string memory name_, string memory symbol_, address treasury_) ERC721Min(name_, symbol_) {
        proxyRegistryAddress = 0xa5409ec958C83C3f309868babACA7c86DCB077c1;
        treasuryAddress = treasury_;
    }

    function totalSupply() external view returns(uint256) {
        return _owners.length;
    }

    // ** - CORE - ** //

    function buyOne() external payable {
        require(saleActive, "SALE_CLOSED");
        require(!disableSalesWithETH, "NO_ETH_SALES");
        require(price == msg.value, "INCORRECT_ETH");
        require(maxMintForOne > _owners.length, "EXCEED_MAX_SALE_SUPPLY");
        require(maxPerAddress == 0 || balanceOf(_msgSender()) < maxPerAddress, "EXCEED_MAX_PER_USER");
        _mintMin();
    }     

    function buyThree() external payable {
        require(saleActive, "SALE_CLOSED");
        require(!disableSalesWithETH, "NO_ETH_SALES");
        require(priceForThree == msg.value, "INCORRECT_ETH");
        require(maxMintForThree > _owners.length, "EXCEED_MAX_SALE_SUPPLY");
        require(maxPerAddress == 0 || balanceOf(_msgSender()) < maxPerAddressForThree, "EXCEED_MAX_PER_USER");
        _mintMin();
        _mintMin();
        _mintMin();
    }

    function buy(uint8 amount) external payable {
        require(saleActive, "SALE_CLOSED");
        require(!disableSalesWithETH, "NO_ETH_SALES");
        require(price * amount == msg.value, "INCORRECT_ETH");
        require(maxMint > _owners.length + amount, "EXCEED_MAX_SALE_SUPPLY");
        require(amount < maxPerMint, "EXCEED_MAX_PER_MINT");
        require(maxPerAddress == 0 || balanceOf(_msgSender()) + amount - 1 < maxPerAddress, "EXCEED_MAX_PER_USER");
        for (uint256 i = 0; i < amount; i++) {
            _mintMin();
        }
    }

    function buyOneWithToken() external payable {
        require(saleActive, "SALE_CLOSED");
        require(!disableSalesWithToken, "NO_TOKEN_SALES");
        IERC20(paymentToken).transferFrom(msg.sender, address(this), priceWithToken);
        require(maxMintForOne > _owners.length, "EXCEED_MAX_SALE_SUPPLY");
        require(maxPerAddress == 0 || balanceOf(_msgSender()) < maxPerAddress, "EXCEED_MAX_PER_USER");
        _mintMin();
    }     

    function buyThreeWithToken() external payable {
        require(saleActive, "SALE_CLOSED");
        require(!disableSalesWithToken, "NO_TOKEN_SALES");
        IERC20(paymentToken).transferFrom(msg.sender, address(this), priceForThreeWithToken);
        require(maxMintForThree > _owners.length, "EXCEED_MAX_SALE_SUPPLY");
        require(maxPerAddress == 0 || balanceOf(_msgSender()) < maxPerAddressForThree, "EXCEED_MAX_PER_USER");
        _mintMin();
        _mintMin();
        _mintMin();
    }

    function buyWithToken(uint16 amount) external payable {
        require(saleActive, "SALE_CLOSED");
        require(!disableSalesWithToken, "NO_TOKEN_SALES");
        IERC20(paymentToken).transferFrom(msg.sender, address(this), priceWithToken * amount);
        require(maxMint > _owners.length + amount, "EXCEED_MAX_SALE_SUPPLY");
        require(amount < maxPerMint, "EXCEED_MAX_PER_MINT");
        require(maxPerAddress == 0 || balanceOf(_msgSender()) + amount - 1 < maxPerAddress, "EXCEED_MAX_PER_USER");
        for (uint256 i = 0; i < amount; i++) {
            _mintMin();
        }
    }

    // ** - PROXY - ** //

    function mintOne(address receiver) external onlyProxy {
        _mintMin2(receiver);
    }

    function mintThree(address receiver) external onlyProxy {
        _mintMin2(receiver);
        _mintMin2(receiver);
        _mintMin2(receiver);
    }   

    function mint(address receiver, uint16 amount) external onlyProxy {
        for (uint256 i = 0; i < amount; i++) {
            _mintMin2(receiver);
        }
    }    

    // ** - ADMIN - ** //

    function addFeeRecipient(address recipient, uint256 basisPoints) external onlyOwner {
        feeRecipientCount++;
        FeeRecipients[feeRecipientCount].recipient = recipient;
        FeeRecipients[feeRecipientCount].basisPoints = basisPoints;
        totalFeeBasisPoints += basisPoints;
    }

    function editFeeRecipient(uint256 id, address recipient, uint256 basisPoints) external onlyOwner {
        require(id <= feeRecipientCount, "INVALID_ID");
        totalFeeBasisPoints = totalFeeBasisPoints - FeeRecipients[feeRecipientCount].basisPoints + basisPoints;
        FeeRecipients[feeRecipientCount].recipient = recipient;
        FeeRecipients[feeRecipientCount].basisPoints = basisPoints;
    }

    function distributeETH() public {
        require(feeRecipientCount > 0, "RECIPIENTS_NOT_SET");
        uint256 bal = address(this).balance;
        for(uint256 x = 1; x <= feeRecipientCount; x++) {
            uint256 amount = bal * FeeRecipients[x].basisPoints / totalFeeBasisPoints;
            amount = amount > address(this).balance ? address(this).balance : amount;
            (bool sent, ) = FeeRecipients[x].recipient.call{value: amount}("");
            require(sent, "FAILED_SENDING_FUNDS");
        }
        emit DistributeETH(_msgSender(), bal);
    }

    function distributeTokens() public {
        require(feeRecipientCount > 0, "RECIPIENTS_NOT_SET");
        uint256 bal = IERC20(paymentToken).balanceOf(address(this));
        for(uint256 x = 1; x <= feeRecipientCount; x++) {
            uint256 amount = bal * FeeRecipients[x].basisPoints / totalFeeBasisPoints;
            amount = amount > address(this).balance ? address(this).balance : amount;
            IERC20(paymentToken).transfer(FeeRecipients[x].recipient, amount);
        }
        emit DistributeTokens(_msgSender(), bal);
    }

    function withdrawETH() public {
        require(_msgSender() == owner() || _msgSender() == treasuryAddress || proxyToApproved[_msgSender()], "NOT_ALLOWED");
        require(treasuryAddress != address(0), "TREASURY_NOT_SET");
        uint256 bal = address(this).balance;
        (bool sent, ) = treasuryAddress.call{value: bal}("");
        require(sent, "FAILED_SENDING_FUNDS");
        emit WithdrawETH(_msgSender(), bal);
    }

    function withdrawTokens(address _token) external nonReentrant {
        require(_msgSender() == owner() || _msgSender() == treasuryAddress || proxyToApproved[_msgSender()], "NOT_ALLOWED");
        require(treasuryAddress != address(0), "TREASURY_NOT_SET");
        IERC20(_token).safeTransfer(
            treasuryAddress,
            IERC20(_token).balanceOf(address(this))
        );
    }

    function gift(address[] calldata receivers, uint256[] memory amounts) external onlyOwner {
        for (uint256 x = 0; x < receivers.length; x++) {
            for (uint256 i = 0; i < amounts[x]; i++) {
                _mintMin2(receivers[x]);
            }
        }
    }

    function setDisableSalesWithETH(bool value) external onlyOwner {
        disableSalesWithETH = value;
    }

    function setDisableSalesWithToken(bool value) external onlyOwner {
        disableSalesWithToken = value;
    }

    function updateConfig(uint16 _maxMint, uint16 _maxPerMint, uint256 _price, 
        uint16 _maxPerAddress, bool _saleActive, string calldata _uri,
        address _paymentToken, uint256 _priceWithToken) external onlyOwner
    {
        maxMint = _maxMint+1;
        maxMintForOne = _maxMint;
        maxMintForThree = _maxMint-2;
        maxPerMint = _maxPerMint + 1;
        price = _price;
        priceForThree = _price * 3;
        maxPerAddress = _maxPerAddress > 0 ? _maxPerAddress : 0;
        maxPerAddressForThree = _maxPerAddress > 1 ? _maxPerAddress - 2 : 0;
        saleActive = _saleActive;
        _tokenBaseURI = _uri;
        paymentToken = _paymentToken;
        priceWithToken = _priceWithToken;
        priceForThreeWithToken = _priceWithToken * 3;        
    }

    function updateToken(address _paymentToken, uint256 _priceWithToken) external onlyOwner {
        paymentToken = _paymentToken;
        priceWithToken = _priceWithToken;
        priceForThreeWithToken = _priceWithToken * 3;
    }

    function toggleSaleActive() external onlyOwner {
        saleActive = !saleActive;
    }    

    function setMaxPerMint(uint16 _maxPerMint) external onlyOwner {
        maxPerMint = _maxPerMint;
    }

    function setMaxMint(uint16 maxMint_) external onlyOwner {
        maxMint = maxMint_ + 1;
        maxMintForOne = maxMint_;
        maxMintForThree = maxMint_ - 2;
    }

    function setMaxPerAddress(uint16 _maxPerAddress) external onlyOwner {
        maxPerAddress = _maxPerAddress > 0 ? _maxPerAddress : 0;
        maxPerAddressForThree = _maxPerAddress > 1 ? _maxPerAddress - 2 : maxPerAddress;
    }

    function setPrice(uint256 _price) external onlyOwner {
        price = _price;
        priceForThree = _price * 3;
    }    

    // to avoid opensea listing costs
    function isApprovedForAll(address _owner, address operator) public view override returns (bool) {
        OpenSeaProxyRegistry proxyRegistry = OpenSeaProxyRegistry(proxyRegistryAddress);
        if (
            address(proxyRegistry.proxies(_owner)) == operator ||
            proxyToApproved[operator]
        ) return true;
        return super.isApprovedForAll(_owner, operator);
    }

    function flipProxyState(address proxyAddress) public onlyOwner {
        proxyToApproved[proxyAddress] = !proxyToApproved[proxyAddress];
    }

    function isProxyToApproved(address proxyAddress) external view onlyOwner returns(bool) {
        return proxyToApproved[proxyAddress];
    }

    // ** - SETTERS - ** //

    function setVaultAddress(address addr) external onlyOwner {
        treasuryAddress = addr;
    }

    function setContractURI(string calldata URI) external onlyOwner {
        _contractURI = URI;
    }

    function setBaseURI(string calldata URI) external onlyOwner {
        _tokenBaseURI = URI;
    }

    // ** - MISC - ** //

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

    function toggleUseBaseUri() external onlyOwner {
        useBaseUriOnly = !useBaseUriOnly;
    }

    function tokenURI(uint256 tokenId) external view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
        if (bytes(TokenURIMap[tokenId]).length > 0) return TokenURIMap[tokenId];        
        if (useBaseUriOnly) return _tokenBaseURI;
        return bytes(_tokenBaseURI).length > 0
                ? string(abi.encodePacked(_tokenBaseURI, tokenId.toString()))
                : "";
    }

    function setTokenUri(uint256 tokenId, string calldata _uri) external onlyOwner {
        TokenURIMap[tokenId] = _uri;
    }

    function isOwnerOf(address account, uint256[] calldata _tokenIds) external view returns (bool) {
        for (uint256 i; i < _tokenIds.length; ++i) {
            if (_owners[_tokenIds[i]] != account) return false;
        }
        return true;
    }

    function setTransferDisabled(bool _transferDisabled) external onlyOwner {
        transferDisabled = _transferDisabled;
    }

    function setStakingContract(address stakingContract) external onlyOwner {
        _setStakingContract(stakingContract);
    }

    function unStake(uint256 tokenId) external onlyOwner {
        _unstake(tokenId);
    } 

    function batchSafeTransferFrom(address _from, address _to, uint256[] memory _tokenIds, bytes memory data_) public override {
        require(!transferDisabled || _msgSender() == owner() || proxyToApproved[_msgSender()], "TRANSFER_DISABLED");
        super.batchSafeTransferFrom(_from, _to, _tokenIds, data_);
    }   

    function batchTransferFrom(address _from, address _to, uint256[] memory _tokenIds) public override {
        require(!transferDisabled || _msgSender() == owner() || proxyToApproved[_msgSender()], "TRANSFER_DISABLED");
        super.batchTransferFrom(_from, _to, _tokenIds);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public override {
        require(!transferDisabled || _msgSender() == owner() || proxyToApproved[_msgSender()], "TRANSFER_DISABLED");
        super.safeTransferFrom(from, to, tokenId, _data);
    }

    function transferFrom(address from, address to, uint256 tokenId) public override {
        require(!transferDisabled || _msgSender() == owner() || proxyToApproved[_msgSender()], "TRANSFER_DISABLED");
        super.transferFrom(from, to, tokenId);
    }    

    modifier onlyProxy() {
        require(proxyToApproved[_msgSender()] == true, "onlyProxy");
        _;
    }    

    event DistributeETH(address indexed sender, uint256 indexed balance);
    event DistributeTokens(address indexed sender, uint256 indexed balance);
    event WithdrawETH(address indexed sender, uint256 indexed balance);
}

File 2 of 14 : 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 3 of 14 : 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 4 of 14 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

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

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

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

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

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

        _;

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

File 5 of 14 : SafeERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../utils/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 Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @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");
        }
    }
}

File 6 of 14 : ERC721Min.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.11;

import "@openzeppelin/contracts/utils/introspection/ERC165.sol";
import "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
import "@openzeppelin/contracts/utils/Address.sol";

abstract contract ERC721Min is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    address[] internal _owners;

    // 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"
        );

        uint256 count = 0;
        uint256 length = _owners.length;
        for (uint256 i = 0; i < length; ++i) {
            if (owner == _owners[i]) {
                ++count;
            }
        }

        delete length;
        return count;
    }

    function getOwnerCount() external view returns(uint256) {
        return _owners.length;
    }    

    /**
     * @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 {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721Min.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
    {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

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

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

        _transfer(from, to, tokenId);
    }

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

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

    function batchTransferFrom(
        address _from,
        address _to,
        uint256[] memory _tokenIds
    ) public virtual {
        for (uint256 i = 0; i < _tokenIds.length; i++) {
            transferFrom(_from, _to, _tokenIds[i]);
        }
    }

    function batchSafeTransferFrom(
        address _from,
        address _to,
        uint256[] memory _tokenIds,
        bytes memory data_
    ) public virtual {
        for (uint256 i = 0; i < _tokenIds.length; i++) {
            safeTransferFrom(_from, _to, _tokenIds[i], 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 tokenId < _owners.length && _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 = ERC721Min.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), "MINT_TO_ZERO");
        require(!_exists(tokenId), "TOKEN_MINTED");
        _owners.push(to);
        emit Transfer(address(0), to, tokenId);
    }

    function _mintMin() internal virtual {
        _owners.push(_msgSender());
        emit Transfer(address(0), _msgSender(), _owners.length - 1);
    }

    // check to != address(0) in calling function
    function _mintMin2(address to) internal virtual {
        _owners.push(to);
        emit Transfer(address(0), to, _owners.length - 1);
    }

    /**
     * @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 = ERC721Min.ownerOf(tokenId);

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

        // Clear approvals
        _approve(address(0), tokenId);
        _owners[tokenId] = address(0);

        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(
            ERC721Min.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);
        _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(ERC721Min.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try
                IERC721Receiver(to).onERC721Received(
                    _msgSender(),
                    from,
                    tokenId,
                    _data
                )
            returns (bytes4 retval) {
                return retval == IERC721Receiver.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 {}

    mapping(uint256 => bool) _isStaked;
    address internal stakingContract;

    function _setStakingContract(address _stakingContract) internal virtual {
        stakingContract = _stakingContract;
    }

    modifier onlyStakingContract() {
        require(
            _msgSender() == stakingContract,
            "ONLY_STAKING_CONTRACT"
        );
        _;
    }

    function isStaked(uint256 tokenId) external view returns(bool) {
        return _isStaked[tokenId];
    }

    function stake(address user, uint256 tokenId) external onlyStakingContract {
        require(ownerOf(tokenId) == user, "NOT_OWNER");
        require(!_isStaked[tokenId], "ALREADY_STAKED");
        _isStaked[tokenId] = !_isStaked[tokenId];
    }

    /* should only be called by contract owner */
    function _unstake(uint256 tokenId) internal virtual {
        _isStaked[tokenId] = false;
    }

    function unstake(address user, uint256 tokenId) external onlyStakingContract {
        require(ownerOf(tokenId) == user, "NOT_OWNER");
        _isStaked[tokenId] = false;
    }

    function tokenOfOwnerByIndex(address account, uint256 index) public view returns (uint256) {
        uint256 foundCount;
        for (uint256 i; i < _owners.length; ++i) {
            if (_owners[i] == account) {
                if (foundCount == index) return i;
                foundCount++;
            }
        }
        require(foundCount > 0, "NONE_FOUND");
        revert("OUT_OF_INDEX");
    }        
}

File 7 of 14 : 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 8 of 14 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from,
        address to,
        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 9 of 14 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

File 10 of 14 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

File 11 of 14 : 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 12 of 14 : 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 13 of 14 : 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 14 of 14 : 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);
}

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

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"string","name":"name_","type":"string"},{"internalType":"string","name":"symbol_","type":"string"},{"internalType":"address","name":"treasury_","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":"sender","type":"address"},{"indexed":true,"internalType":"uint256","name":"balance","type":"uint256"}],"name":"DistributeETH","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"uint256","name":"balance","type":"uint256"}],"name":"DistributeTokens","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"uint256","name":"balance","type":"uint256"}],"name":"WithdrawETH","type":"event"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"FeeRecipients","outputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"basisPoints","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"TokenURIMap","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"basisPoints","type":"uint256"}],"name":"addFeeRecipient","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_from","type":"address"},{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256[]","name":"_tokenIds","type":"uint256[]"},{"internalType":"bytes","name":"data_","type":"bytes"}],"name":"batchSafeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_from","type":"address"},{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256[]","name":"_tokenIds","type":"uint256[]"}],"name":"batchTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint8","name":"amount","type":"uint8"}],"name":"buy","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"buyOne","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"buyOneWithToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"buyThree","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"buyThreeWithToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint16","name":"amount","type":"uint16"}],"name":"buyWithToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"contractURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"disableSalesWithETH","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"disableSalesWithToken","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"distributeETH","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"distributeTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"basisPoints","type":"uint256"}],"name":"editFeeRecipient","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"proxyAddress","type":"address"}],"name":"flipProxyState","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getOwnerCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"receivers","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"name":"gift","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256[]","name":"_tokenIds","type":"uint256[]"}],"name":"isOwnerOf","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"proxyAddress","type":"address"}],"name":"isProxyToApproved","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"isStaked","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxMintForOne","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxPerAddress","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxPerMint","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"receiver","type":"address"},{"internalType":"uint16","name":"amount","type":"uint16"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"receiver","type":"address"}],"name":"mintOne","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"receiver","type":"address"}],"name":"mintThree","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"paymentToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"priceForThreeWithToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"priceWithToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"proxyRegistryAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"saleActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"fu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string","name":"_uri","type":"string"},{"internalType":"address","name":"_paymentToken","type":"address"},{"internalType":"uint256","name":"_priceWithToken","type":"uint256"}],"name":"updateConfig","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_paymentToken","type":"address"},{"internalType":"uint256","name":"_priceWithToken","type":"uint256"}],"name":"updateToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"useBaseUriOnly","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdrawETH","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"withdrawTokens","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000046cf71f924c035c3242d6afb61af4eadfe0bdcd5000000000000000000000000000000000000000000000000000000000000001850692050726f746f636f6c202d204554482053696c76657200000000000000000000000000000000000000000000000000000000000000000000000000000008506953696c766572000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : name_ (string): Pi Protocol - ETH Silver
Arg [1] : symbol_ (string): PiSilver
Arg [2] : treasury_ (address): 0x46CF71F924c035C3242D6afb61aF4eaDFE0bDCd5

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 00000000000000000000000046cf71f924c035c3242d6afb61af4eadfe0bdcd5
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000018
Arg [4] : 50692050726f746f636f6c202d204554482053696c7665720000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000008
Arg [6] : 506953696c766572000000000000000000000000000000000000000000000000


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