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Create Session158605192022-10-30 11:16:231135 days ago1667128583IN
0xa13d5470...C25986770
0 ETH0.000207336.86797846
Create Session158605172022-10-30 11:15:591135 days ago1667128559IN
0xa13d5470...C25986770
0 ETH0.003668626.31721328
Contribute158408692022-10-27 17:21:471138 days ago1666891307IN
0xa13d5470...C25986770
0 ETH0.0035467514.04625961
Create Session158404642022-10-27 16:00:231138 days ago1666886423IN
0xa13d5470...C25986770
0 ETH0.0126688420.91417129
Contribute157836742022-10-19 17:34:111146 days ago1666200851IN
0xa13d5470...C25986770
0 ETH0.0141704256.11673393
Contribute157726952022-10-18 4:46:471148 days ago1666068407IN
0xa13d5470...C25986770
0 ETH0.0041075516.26645757
Create Session157715442022-10-18 0:55:471148 days ago1666054547IN
0xa13d5470...C25986770
0 ETH0.0102386515.92906015
Contribute157613792022-10-16 14:49:351149 days ago1665931775IN
0xa13d5470...C25986770
0 ETH0.0003748812.32966915
Contribute157613782022-10-16 14:49:231149 days ago1665931763IN
0xa13d5470...C25986770
0 ETH0.0030255413.01058367
Contribute157601142022-10-16 10:35:111149 days ago1665916511IN
0xa13d5470...C25986770
0 ETH0.0029100911.52433866
Create Session157473302022-10-14 15:45:351151 days ago1665762335IN
0xa13d5470...C25986770
0 ETH0.0128513619.99384492
Create Session157322362022-10-12 13:09:231153 days ago1665580163IN
0xa13d5470...C25986770
0 ETH0.0123580419.75182831
Contribute155690442022-09-19 17:28:591176 days ago1663608539IN
0xa13d5470...C25986770
0 ETH0.0075677429.96922982
Contribute155604232022-09-18 12:26:351177 days ago1663503995IN
0xa13d5470...C25986770
0 ETH0.001509015.97590922
Create Session155558342022-09-17 21:00:111178 days ago1663448411IN
0xa13d5470...C25986770
0 ETH0.004205236.72121301
Contribute154955852022-09-08 8:46:321187 days ago1662626792IN
0xa13d5470...C25986770
0 ETH0.0039456515.62531049
Safe Transfer Fr...154858972022-09-06 19:21:581189 days ago1662492118IN
0xa13d5470...C25986770
0 ETH0.0009974313.92439173
Mint154858372022-09-06 19:10:071189 days ago1662491407IN
0xa13d5470...C25986770
0.01 ETH0.0033727419.55510067
Create Session154842342022-09-06 13:00:231189 days ago1662469223IN
0xa13d5470...C25986770
0 ETH0.0079155712.65143823
Contribute154838872022-09-06 11:50:001189 days ago1662465000IN
0xa13d5470...C25986770
0 ETH0.001828527.86311881
Contribute154739222022-09-04 21:14:421191 days ago1662326082IN
0xa13d5470...C25986770
0 ETH0.001338085.75409377
Create Session154732012022-09-04 18:27:441191 days ago1662316064IN
0xa13d5470...C25986770
0 ETH0.00320085.09576706
Contribute154649672022-09-03 10:55:051192 days ago1662202505IN
0xa13d5470...C25986770
0 ETH0.001396226.00256222
Contribute154601512022-09-02 16:16:201193 days ago1662135380IN
0xa13d5470...C25986770
0 ETH0.0047152420.27144872
Create Session154586252022-09-02 10:32:031193 days ago1662114723IN
0xa13d5470...C25986770
0 ETH0.007279511.7401136
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Contract Source Code Verified (Exact Match)

Contract Name:
Prompt

Compiler Version
v0.8.12+commit.f00d7308

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
//SPDX-License-Identifier: MIT
pragma solidity 0.8.12;

import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/utils/Address.sol";

/// @title Prompt
/// @author Burak Arıkan & Sam Hart
/// @notice Extends the ERC721 non-fungible token standard to enable time-bound verifiable collaborative authorship

contract Prompt is ERC721 {

    /// ============ Events ============

    event SessionCreated(uint256 tokenId, address contributor, address reservedAddress);
    event MemberAdded(uint256 tokenId, address account);
    event Contributed(uint256 tokenId, string contributionURI, address creator, uint256 price);
    event PriceSet(uint256 tokenId, address contributor, uint256 price);
    event PaymentReleased(address to, uint256 amount);

    /// ============ Structs ============

    struct Contribution {
        uint256 createdAt;
        uint256 price;
        address payable creator;
        string contributionURI;
    }

    /// ============ Mutable storage ============

    using Counters for Counters.Counter;
    Counters.Counter private _tokenIds;
    mapping (uint256 => uint8) public memberCount; // memberCount[tokenId]
    mapping (uint256 => uint8) public contributionCount; // contributionCount[tokenId]
    mapping (uint256 => bool) public minted; // minted[tokenId]
    mapping (uint256 => uint256) public endsAt; // endsAt[tokenId]
    mapping (uint256 => address) public reservedFor; // reservedFor[tokenId]
    mapping (uint256 => address[]) public members; // members[tokenId]
    mapping (address => uint256[]) public createdSessions; // createdSessions[address]
    mapping (uint256 => mapping (address => bool)) public membership; // membership[tokenId][address]
    mapping (uint256 => mapping (address => Contribution)) public contributed; // contributed[tokenId][address]
    mapping (address => uint256[]) public contributedTokens; // contributedTokens[address]
    mapping (address => bool) public allowlist; // allowlist[address]
    mapping(uint256 => string) private _tokenURIs; // _tokenURIs[tokenId]

    mapping(address => uint256) private _balances; // _balances[account]
    mapping(address => uint256) private _released; // _released[account]

    /// ============ Immutable storage ============

    uint256 immutable public memberLimit;
    uint256 immutable public totalSupply;
    uint256 immutable public sessionLimitPerAccount;
    uint256 immutable public baseMintFee;
    uint256 immutable public mintFeeRate;
    address payable feeAddress;

    /// ============ Constructor ============

    /// @notice Creates a new Prompt NFT contract
    /// @param tokenName name of NFT
    /// @param tokenSymbol symbol of NFT
    /// @param _memberLimit member limit of each NFT
    /// @param _totalSupply total NFTs to mint
    /// @param _sessionLimitPerAccount max number of NFTs a member can create
    /// @param _baseMintFee in wei per NFT
    /// @param _mintFeeRate in percentage per NFT
    /// @param _feeAddress where mint fees are paid
    constructor(
        string memory tokenName,
        string memory tokenSymbol,
        uint256 _memberLimit,
        uint256 _totalSupply,
        uint256 _sessionLimitPerAccount,
        uint256 _baseMintFee,
        uint256 _mintFeeRate,
        address payable _feeAddress
    ) ERC721(
        tokenName,
        tokenSymbol
    ) {
        require(_memberLimit >= 2, "_memberLimit cannot be smaller than 2");
        require(_totalSupply > 0, "_totalSupply cannot be 0");
        require(_sessionLimitPerAccount > 0, "_sessionLimitPerAccount cannot be 0");
        require(_baseMintFee > 0, "_baseMintFee cannot be 0");
        require(_mintFeeRate > 0, "_mintFeeRate cannot be 0");
        require(_feeAddress != address(0), "feeAddress cannot be null address");

        memberLimit = _memberLimit;
        totalSupply = _totalSupply;
        sessionLimitPerAccount = _sessionLimitPerAccount;
        baseMintFee = _baseMintFee;
        mintFeeRate = _mintFeeRate;
        feeAddress = _feeAddress;
        allowlist[msg.sender] = true;
    }

    /// ============ Modifiers ============

    modifier isAllowed() {
        require (allowlist[msg.sender],
            'account is not in allowlist');
        _;
    }
    modifier onlyMemberOf(uint256 _tokenId) {
        require(membership[_tokenId][msg.sender],
            'not a session member');
        _;
    }
    modifier canCreateSession() {
        require (createdSessions[msg.sender].length < sessionLimitPerAccount,
            'account reached session limit');
        _;
    }
    modifier isNotEnded(uint256 _tokenId) {
        require(endsAt[_tokenId] > block.timestamp,
                'session has ended');
        _;
    }
    modifier isEnded(uint256 _tokenId) {
        require(endsAt[_tokenId] < block.timestamp,
                'session has not ended yet');
        _;
    }
    modifier isNotEmpty(string memory _content) {
        require(bytes(_content).length != 0,
            'URI cannot be empty');
        _;
    }
    modifier memberNotContributed(uint256 _tokenId) {
        require (contributed[_tokenId][msg.sender].creator == address(0),
            'address already contributed');
        _;
    }
    modifier memberContributed(uint256 _tokenId) {
        require (contributed[_tokenId][msg.sender].creator == msg.sender,
            'address is not the creator of this contribution');
        _;
    }
    modifier isLastContribution(uint _tokenId) {
        require(contributionCount[_tokenId] == memberLimit - 1,
            'is not the last contribution');
        _;
    }
    modifier isFinalized(uint _tokenId) {
        require(contributionCount[_tokenId] == memberLimit || (endsAt[_tokenId] != 0 && endsAt[_tokenId] < block.timestamp),
            'not all members contributed or session has not ended yet');
        _;
    }
    modifier isNotMinted(uint _tokenId) {
        require(!minted[_tokenId],
            'session already minted');
        _;
    }

    /// ============ Functions ============

    /// @notice Create a session with tokenID. A session becomes mintable when it is finalized (all members contributed or endsAt is exceeded)
    /// @param _reservedAddress If set (optional), only this address can mint. Can be used for commissioned work.
    /// @param _endsAt All contributions must be submited before this time
    /// @param _members List of addresses who can contribute
    /// @param _contributionURI The first contribution metadata to the session
    /// @param _contributionPrice The first contribution price
    function createSession(
        address _reservedAddress,
        uint256 _endsAt,
        address[] calldata _members,
        string calldata _contributionURI,
        uint256 _contributionPrice
    )
        external
        isNotEmpty(_contributionURI)
        isAllowed()
        canCreateSession()
    {
        require(_tokenIds.current() < totalSupply, "reached token supply limit");
        require(_members.length <= memberLimit, "reached member limit");
        require(_endsAt > block.timestamp, "quit living in the past");

        uint256 newTokenId = _tokenIds.current();

        uint256 length = _members.length;
        for (uint256 i=0; i < length;) {
            require(_members[i] != address(0), 'address cannot be null address');
            require(!membership[newTokenId][_members[i]], 'address is already a member of session');
            membership[newTokenId][_members[i]] = true;
            memberCount[newTokenId]++;
            members[newTokenId].push(_members[i]);
            allowlist[_members[i]] = true;
            unchecked { ++i; }
        }

        endsAt[newTokenId] = _endsAt;

        if (_reservedAddress != address(0)) {
            reservedFor[newTokenId] = _reservedAddress;
        }

        createdSessions[msg.sender].push(newTokenId);

        contributed[newTokenId][msg.sender] = Contribution(block.timestamp, _contributionPrice, payable(msg.sender), _contributionURI);
        contributedTokens[msg.sender].push(newTokenId);
        contributionCount[newTokenId]++;

        _setTokenURI(newTokenId, _contributionURI);

        _tokenIds.increment();

        emit SessionCreated(newTokenId, msg.sender, _reservedAddress);
    }

    /// @notice msg.sender contributes to a session with tokenId, contribution URI and price
    /// @param _tokenId The session to contribute
    /// @param _contributionURI Contribution metadata
    /// @param _contributionPrice Contribution price
    function contribute(
        uint256 _tokenId,
        string calldata _contributionURI,
        uint256 _contributionPrice
    )
        external
        isNotEnded(_tokenId)
        onlyMemberOf(_tokenId)
        memberNotContributed(_tokenId)
        isNotEmpty(_contributionURI)
    {
        contributed[_tokenId][msg.sender] = Contribution(block.timestamp, _contributionPrice, payable(msg.sender), _contributionURI);
        contributedTokens[msg.sender].push(_tokenId);
        contributionCount[_tokenId]++;

        _setTokenURI(_tokenId, _contributionURI);

        emit Contributed(_tokenId, _contributionURI, msg.sender, _contributionPrice);
    }

    /// @notice Set price of the msg.sender's contribution to a session, if not yet minted
    /// @param _tokenId The session of contribution
    /// @param _price New contribution price
    function setPrice(uint256 _tokenId, uint256 _price)
        external
        memberContributed(_tokenId)
        isNotMinted(_tokenId)
    {
        Contribution storage _contribution = contributed[_tokenId][msg.sender];
        _contribution.price = _price;

        emit PriceSet(_tokenId, msg.sender, _contribution.price);
    }

    /// @notice Anyone can mint paying the total
    /// @param _tokenId The session to mint
    function mint(uint256 _tokenId)
        external
        payable
        isFinalized(_tokenId)
    {
        if (reservedFor[_tokenId] != address(0)) {
            require(reservedFor[_tokenId] == msg.sender, "Mint is reserved for another address");
        }

        uint256 mintFee = baseMintFee;
        uint256 totalPrice = 0;

        Contribution[] memory contributions = getContributions(_tokenId);

        uint256 length = contributions.length;
        for (uint256 i=0; i < length;) {
            totalPrice += contributions[i].price;
            unchecked { ++i; }
        }
        if (totalPrice > 0) {
            mintFee = totalPrice * mintFeeRate / 100;
        }
        require(msg.value == totalPrice + mintFee, "Payment must be equal to listing price + mint fee");

        if (totalPrice > 0) {
            for (uint256 i=0; i < length;) {
                if (contributions[i].price > 0) {
                    _balances[contributions[i].creator] = _balances[contributions[i].creator] + contributions[i].price;
                    // contributions[i].creator.transfer(contributions[i].price);
                }
                unchecked { ++i; }
            }
        }

        minted[_tokenId] = true;

        Address.sendValue(feeAddress, mintFee);
        // feeAddress.transfer(mintFee);

        _safeMint(msg.sender, _tokenId);
    }

     /**
     * @notice Triggers a transfer to `account` of the amount of Ether they are owed,
     * according to their balance and their previous withdrawals.
     */
    function withdraw(address payable account) public virtual {
        require(balance(account) > 0, "Account has no balance");

        uint256 payment = releasable(account);

        require(payment != 0, "Account is not due payment");

        _released[account] += payment;
        // _balances[account] -= payment;

        Address.sendValue(account, payment);
        emit PaymentReleased(account, payment);
    }

    /// ============ Internal functions ============

    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        _tokenURIs[tokenId] = _tokenURI;
    }

    /// ============ Read-only functions ============

    function contractURI() public pure returns (string memory) {
        return "https://exquisitecorpse.prompts.studio/contract-metadata.json";
    }

    /**
     * @dev Get the amount of Eth held by an account.
     */
    function balance(address account) public view returns (uint256) {
        return _balances[account];
    }

    /**
     * @notice Get the amount of payee's releasable Eth.
     */
    function releasable(address account) public view returns (uint256) {
        return _balances[account] - _released[account];
    }

    /**
     * @notice Get the amount of Eth already released to a payee.
     */
    function released(address account) public view returns (uint256) {
        return _released[account];
    }

    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "URI query for nonexistent token");
        return _tokenURIs[tokenId];
    }

    /// @notice Get current count of minted tokens
    /// @return Returns number
    function tokenCount() external view virtual returns (uint256) {
        return _tokenIds.current();
    }

    /// @notice Check if an address is member of a session
    /// @return Returns true or false
    function isMember(uint256 _tokenId, address _account) external view virtual returns (bool) {
        return membership[_tokenId][_account];
    }

    /// @notice Check if all session members contributed
    /// @return Returns true or false
    function isCompleted(uint256 _tokenId) external view virtual returns (bool) {
        return contributionCount[_tokenId] == memberLimit;
    }

    /// @notice Check if account can create a new session
    /// @return Returns true or false
    function accountCanCreateSession(address _account) external view virtual returns (bool) {
        return createdSessions[_account].length < sessionLimitPerAccount;
    }

    /// @notice Get sessions initiated by an account
    /// @return Returns tokenIds
    function sessionCountByAccount(address _account)  external view virtual returns (uint256[] memory) {
        return createdSessions[_account];
    }

    /// @notice Get tokens contributed by an account
    /// @return Returns tokenIds
    function getContributedTokens(address _account) external view virtual returns (uint256[] memory) {
        return contributedTokens[_account];
    }

    /// @notice Get contributions of a token
    /// @return Returns contributions
    function getContributions(uint256 _tokenId) internal view returns (Contribution[] memory) {
        Contribution[] memory contributions_arr = new Contribution[](members[_tokenId].length);
        for (uint256 i=0; i < members[_tokenId].length; i++) {
            contributions_arr[i] = (contributed[_tokenId][members[_tokenId][i]]);
        }
        return contributions_arr;
    }

    /// @notice Get session data
    /// @return Returns (owner: address, endsAt: blocktime, tokenURI: string, members: address[], contributions: Contribution[], reserved: address)
    function getSession(uint256 _tokenId) external view virtual
        returns (
            address,
            uint256,
            string memory,
            address[] memory,
            Contribution[] memory,
            address
        )
    {
        string memory tokenuri = "";
        address sessionOwner = address(0);
        if (minted[_tokenId]) {
            tokenuri = tokenURI(_tokenId);
            sessionOwner = ownerOf(_tokenId);
        }
        return(
            sessionOwner,
            endsAt[_tokenId],
            tokenuri,
            members[_tokenId],
            getContributions(_tokenId),
            reservedFor[_tokenId]
        );
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

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

pragma solidity ^0.8.0;

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

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

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _approve(to, tokenId);
    }

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

        return _tokenApprovals[tokenId];
    }

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

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

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

        _transfer(from, to, tokenId);
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _beforeTokenTransfer(from, to, tokenId);

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

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

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId);
    }

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/extensions/ERC721URIStorage.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";

/**
 * @dev ERC721 token with storage based token URI management.
 */
abstract contract ERC721URIStorage is ERC721 {
    using Strings for uint256;

    // Optional mapping for token URIs
    mapping(uint256 => string) private _tokenURIs;

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

        string memory _tokenURI = _tokenURIs[tokenId];
        string memory base = _baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).length == 0) {
            return _tokenURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(base, _tokenURI));
        }

        return super.tokenURI(tokenId);
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        require(_exists(tokenId), "ERC721URIStorage: URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @dev See {ERC721-_burn}. This override additionally checks to see if a
     * token-specific URI was set for the token, and if so, it deletes the token URI from
     * the storage mapping.
     */
    function _burn(uint256 tokenId) internal virtual override {
        super._burn(tokenId);

        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

File 7 of 12 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

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

// 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);
}

// 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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

// 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;
    }
}

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

pragma solidity ^0.8.0;

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

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

Contract Security Audit

Contract ABI

API
[{"inputs":[{"internalType":"string","name":"tokenName","type":"string"},{"internalType":"string","name":"tokenSymbol","type":"string"},{"internalType":"uint256","name":"_memberLimit","type":"uint256"},{"internalType":"uint256","name":"_totalSupply","type":"uint256"},{"internalType":"uint256","name":"_sessionLimitPerAccount","type":"uint256"},{"internalType":"uint256","name":"_baseMintFee","type":"uint256"},{"internalType":"uint256","name":"_mintFeeRate","type":"uint256"},{"internalType":"address payable","name":"_feeAddress","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":false,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"string","name":"contributionURI","type":"string"},{"indexed":false,"internalType":"address","name":"creator","type":"address"},{"indexed":false,"internalType":"uint256","name":"price","type":"uint256"}],"name":"Contributed","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"MemberAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"PaymentReleased","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"address","name":"contributor","type":"address"},{"indexed":false,"internalType":"uint256","name":"price","type":"uint256"}],"name":"PriceSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"address","name":"contributor","type":"address"},{"indexed":false,"internalType":"address","name":"reservedAddress","type":"address"}],"name":"SessionCreated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"accountCanCreateSession","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"allowlist","outputs":[{"internalType":"bool","name":"","type":"bool"}],"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":"account","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":[],"name":"baseMintFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"contractURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"string","name":"_contributionURI","type":"string"},{"internalType":"uint256","name":"_contributionPrice","type":"uint256"}],"name":"contribute","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"address","name":"","type":"address"}],"name":"contributed","outputs":[{"internalType":"uint256","name":"createdAt","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"},{"internalType":"address payable","name":"creator","type":"address"},{"internalType":"string","name":"contributionURI","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"contributedTokens","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"contributionCount","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_reservedAddress","type":"address"},{"internalType":"uint256","name":"_endsAt","type":"uint256"},{"internalType":"address[]","name":"_members","type":"address[]"},{"internalType":"string","name":"_contributionURI","type":"string"},{"internalType":"uint256","name":"_contributionPrice","type":"uint256"}],"name":"createSession","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"createdSessions","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"endsAt","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"getContributedTokens","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"getSession","outputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"string","name":"","type":"string"},{"internalType":"address[]","name":"","type":"address[]"},{"components":[{"internalType":"uint256","name":"createdAt","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"},{"internalType":"address payable","name":"creator","type":"address"},{"internalType":"string","name":"contributionURI","type":"string"}],"internalType":"struct Prompt.Contribution[]","name":"","type":"tuple[]"},{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"isCompleted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"address","name":"_account","type":"address"}],"name":"isMember","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"memberCount","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"memberLimit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"members","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"address","name":"","type":"address"}],"name":"membership","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"mintFeeRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"minted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"releasable","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"released","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"reservedFor","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","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":[{"internalType":"address","name":"_account","type":"address"}],"name":"sessionCountByAccount","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"sessionLimitPerAccount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"uint256","name":"_price","type":"uint256"}],"name":"setPrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","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":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address payable","name":"account","type":"address"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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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] : tokenName (string): Exquisite Corpse
Arg [1] : tokenSymbol (string): EXC
Arg [2] : _memberLimit (uint256): 3
Arg [3] : _totalSupply (uint256): 1000
Arg [4] : _sessionLimitPerAccount (uint256): 1
Arg [5] : _baseMintFee (uint256): 10000000000000000
Arg [6] : _mintFeeRate (uint256): 10
Arg [7] : _feeAddress (address): 0xa8CA4cF975a4DF6194c8B30F1501f30FCd557c9C

-----Encoded View---------------
12 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000100
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000140
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [3] : 00000000000000000000000000000000000000000000000000000000000003e8
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [5] : 000000000000000000000000000000000000000000000000002386f26fc10000
Arg [6] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [7] : 000000000000000000000000a8ca4cf975a4df6194c8b30f1501f30fcd557c9c
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000010
Arg [9] : 45787175697369746520436f7270736500000000000000000000000000000000
Arg [10] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [11] : 4558430000000000000000000000000000000000000000000000000000000000


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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.