ETH Price: $3,727.35 (+4.85%)

Transaction Decoder

Block:
14138987 at Feb-04-2022 10:34:31 AM +UTC
Transaction Fee:
0.024361884397413999 ETH $90.81
Gas Used:
457,137 Gas / 53.292304927 Gwei

Emitted Events:

226 HuxleyComics.Transfer( from=0x00000000...000000000, to=[Sender] 0x3f32613fd7f10f47469e344de162d72e619fd94e, tokenId=14388 )
227 HuxleyComics.Transfer( from=0x00000000...000000000, to=[Sender] 0x3f32613fd7f10f47469e344de162d72e619fd94e, tokenId=14389 )
228 HuxleyComicsOps.FundsTransfered( _wallet=0xe4588f51e8785700645d5624b6f21f79a19d0c17, _amount=170000000000000000 )
229 HuxleyComicsOps.FundsTransfered( _wallet=0xeb3cfd3127d41ed7dcf4eb51f374c59dec0e6066, _amount=30000000000000000 )

Account State Difference:

  Address   Before After State Difference Code
0x3F32613F...e619fD94E
0.332907137473987439 Eth
Nonce: 178
0.10854525307657344 Eth
Nonce: 179
0.224361884397413999
(F2Pool Old)
5,899.498184014974812776 Eth5,899.499326857474812776 Eth0.0011428425
0x9Ca8887D...e2c97957f
0xd5c32400...3B3744baB
(HUXLEY Comics: Ops)
0xe4588f51...9A19d0c17 0.001402753522527 Eth0.171402753522527 Eth0.17
0xEb3cFd31...DEC0E6066 101.191182524352603053 Eth101.221182524352603053 Eth0.03

Execution Trace

ETH 0.2 HuxleyComicsOps.payableMintBatch( _amountToMint=2 )
  • HuxleyComics.CALL( )
  • HuxleyComics.CALL( )
  • HuxleyComics.CALL( )
  • HuxleyComics.CALL( )
  • HuxleyComics.safeMint( to=0x3F32613Fd7f10F47469e344dE162d72e619fD94E ) => ( _tokenId=14388 )
  • HuxleyComics.setTokenDetails( _tokenId=14388, _tokenType=0 )
  • HuxleyComics.CALL( )
  • HuxleyComics.CALL( )
  • HuxleyComics.safeMint( to=0x3F32613Fd7f10F47469e344dE162d72e619fD94E ) => ( _tokenId=14389 )
  • HuxleyComics.setTokenDetails( _tokenId=14389, _tokenType=0 )
  • ETH 0.17 0xe4588f51e8785700645d5624b6f21f79a19d0c17.CALL( )
  • ETH 0.03 0xeb3cfd3127d41ed7dcf4eb51f374c59dec0e6066.CALL( )
    File 1 of 2: HuxleyComicsOps
    // File: @openzeppelin/contracts/utils/introspection/IERC165.sol
    
    // SPDX-License-Identifier: MIT
    
    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: @openzeppelin/contracts/token/ERC721/IERC721.sol
    
    
    pragma solidity ^0.8.0;
    
    
    /**
     * @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: contracts/interfaces/IHuxleyComics.sol
    
    pragma solidity 0.8.6;
    
     
    interface IHuxleyComics is IERC721 {
        struct Issue {
            uint256 price;
            uint256 goldSupplyLeft;
            uint256 firstEditionSupplyLeft;
            uint256 holographicSupplyLeft;
            uint256 serialNumberToMintGold;
            uint256 serialNumberToMintFirstEdition;
            uint256 serialNumberToMintHolographic;
            uint256 maxPayableMintBatch;
            string uri;
            bool exist;
        }
    
        struct Token {
            uint256 serialNumber;
            uint256 issueNumber;
            TokenType tokenType;
        }
    
        enum TokenType {FirstEdition, Gold, Holographic}
    
        function safeMint(address _to) external returns (uint256);
    
        function getCurrentIssue() external returns (uint256 _currentIssue);
        function getCurrentPrice() external returns (uint256 _currentPrice);
        function getCurrentMaxPayableMintBatch() external returns (uint256 _currentMaxPayableMintBatch);
    
        function createNewIssue(
            uint256 _price,
            uint256 _goldSupply,
            uint256 _firstEditionSupply,
            uint256 _holographicSupply,
            uint256 _startSerialNumberGold,
            uint256 _startSerialNumberFirstEdition,
            uint256 _startSerialNumberHolographic,
            uint256 _maxPaybleMintBatch,
            string memory _uri
        ) external;
    
        function getIssue(uint256 _issueNumber) external returns (Issue memory _issue);
    
        function getToken(uint256 _tokenId) external returns (Token memory _token);
    
        function setTokenDetails(uint256 _tokenId, TokenType _tokenType) external;
    
        function setBaseURI(uint256 _issueNumber, string memory _uri) external;
    
        function setCanBurn(bool _canBurn) external;
    }
    
    // File: @openzeppelin/contracts/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: @openzeppelin/contracts/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: @openzeppelin/contracts/utils/introspection/ERC165.sol
    
    
    pragma solidity ^0.8.0;
    
    
    /**
     * @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: @openzeppelin/contracts/access/AccessControl.sol
    
    
    pragma solidity ^0.8.0;
    
    
    
    
    /**
     * @dev External interface of AccessControl declared to support ERC165 detection.
     */
    interface IAccessControl {
        function hasRole(bytes32 role, address account) external view returns (bool);
    
        function getRoleAdmin(bytes32 role) external view returns (bytes32);
    
        function grantRole(bytes32 role, address account) external;
    
        function revokeRole(bytes32 role, address account) external;
    
        function renounceRole(bytes32 role, address account) external;
    }
    
    /**
     * @dev Contract module that allows children to implement role-based access
     * control mechanisms. This is a lightweight version that doesn't allow enumerating role
     * members except through off-chain means by accessing the contract event logs. Some
     * applications may benefit from on-chain enumerability, for those cases see
     * {AccessControlEnumerable}.
     *
     * Roles are referred to by their `bytes32` identifier. These should be exposed
     * in the external API and be unique. The best way to achieve this is by
     * using `public constant` hash digests:
     *
     * ```
     * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
     * ```
     *
     * Roles can be used to represent a set of permissions. To restrict access to a
     * function call, use {hasRole}:
     *
     * ```
     * function foo() public {
     *     require(hasRole(MY_ROLE, msg.sender));
     *     ...
     * }
     * ```
     *
     * Roles can be granted and revoked dynamically via the {grantRole} and
     * {revokeRole} functions. Each role has an associated admin role, and only
     * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
     *
     * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
     * that only accounts with this role will be able to grant or revoke other
     * roles. More complex role relationships can be created by using
     * {_setRoleAdmin}.
     *
     * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
     * grant and revoke this role. Extra precautions should be taken to secure
     * accounts that have been granted it.
     */
    abstract contract AccessControl is Context, IAccessControl, ERC165 {
        struct RoleData {
            mapping(address => bool) members;
            bytes32 adminRole;
        }
    
        mapping(bytes32 => RoleData) private _roles;
    
        bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;
    
        /**
         * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
         *
         * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
         * {RoleAdminChanged} not being emitted signaling this.
         *
         * _Available since v3.1._
         */
        event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);
    
        /**
         * @dev Emitted when `account` is granted `role`.
         *
         * `sender` is the account that originated the contract call, an admin role
         * bearer except when using {_setupRole}.
         */
        event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);
    
        /**
         * @dev Emitted when `account` is revoked `role`.
         *
         * `sender` is the account that originated the contract call:
         *   - if using `revokeRole`, it is the admin role bearer
         *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
         */
        event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);
    
        /**
         * @dev Modifier that checks that an account has a specific role. Reverts
         * with a standardized message including the required role.
         *
         * The format of the revert reason is given by the following regular expression:
         *
         *  /^AccessControl: account (0x[0-9a-f]{20}) is missing role (0x[0-9a-f]{32})$/
         *
         * _Available since v4.1._
         */
        modifier onlyRole(bytes32 role) {
            _checkRole(role, _msgSender());
            _;
        }
    
        /**
         * @dev See {IERC165-supportsInterface}.
         */
        function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
            return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
        }
    
        /**
         * @dev Returns `true` if `account` has been granted `role`.
         */
        function hasRole(bytes32 role, address account) public view override returns (bool) {
            return _roles[role].members[account];
        }
    
        /**
         * @dev Revert with a standard message if `account` is missing `role`.
         *
         * The format of the revert reason is given by the following regular expression:
         *
         *  /^AccessControl: account (0x[0-9a-f]{20}) is missing role (0x[0-9a-f]{32})$/
         */
        function _checkRole(bytes32 role, address account) internal view {
            if (!hasRole(role, account)) {
                revert(
                    string(
                        abi.encodePacked(
                            "AccessControl: account ",
                            Strings.toHexString(uint160(account), 20),
                            " is missing role ",
                            Strings.toHexString(uint256(role), 32)
                        )
                    )
                );
            }
        }
    
        /**
         * @dev Returns the admin role that controls `role`. See {grantRole} and
         * {revokeRole}.
         *
         * To change a role's admin, use {_setRoleAdmin}.
         */
        function getRoleAdmin(bytes32 role) public view override returns (bytes32) {
            return _roles[role].adminRole;
        }
    
        /**
         * @dev Grants `role` to `account`.
         *
         * If `account` had not been already granted `role`, emits a {RoleGranted}
         * event.
         *
         * Requirements:
         *
         * - the caller must have ``role``'s admin role.
         */
        function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
            _grantRole(role, account);
        }
    
        /**
         * @dev Revokes `role` from `account`.
         *
         * If `account` had been granted `role`, emits a {RoleRevoked} event.
         *
         * Requirements:
         *
         * - the caller must have ``role``'s admin role.
         */
        function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
            _revokeRole(role, account);
        }
    
        /**
         * @dev Revokes `role` from the calling account.
         *
         * Roles are often managed via {grantRole} and {revokeRole}: this function's
         * purpose is to provide a mechanism for accounts to lose their privileges
         * if they are compromised (such as when a trusted device is misplaced).
         *
         * If the calling account had been granted `role`, emits a {RoleRevoked}
         * event.
         *
         * Requirements:
         *
         * - the caller must be `account`.
         */
        function renounceRole(bytes32 role, address account) public virtual override {
            require(account == _msgSender(), "AccessControl: can only renounce roles for self");
    
            _revokeRole(role, account);
        }
    
        /**
         * @dev Grants `role` to `account`.
         *
         * If `account` had not been already granted `role`, emits a {RoleGranted}
         * event. Note that unlike {grantRole}, this function doesn't perform any
         * checks on the calling account.
         *
         * [WARNING]
         * ====
         * This function should only be called from the constructor when setting
         * up the initial roles for the system.
         *
         * Using this function in any other way is effectively circumventing the admin
         * system imposed by {AccessControl}.
         * ====
         */
        function _setupRole(bytes32 role, address account) internal virtual {
            _grantRole(role, account);
        }
    
        /**
         * @dev Sets `adminRole` as ``role``'s admin role.
         *
         * Emits a {RoleAdminChanged} event.
         */
        function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
            emit RoleAdminChanged(role, getRoleAdmin(role), adminRole);
            _roles[role].adminRole = adminRole;
        }
    
        function _grantRole(bytes32 role, address account) private {
            if (!hasRole(role, account)) {
                _roles[role].members[account] = true;
                emit RoleGranted(role, account, _msgSender());
            }
        }
    
        function _revokeRole(bytes32 role, address account) private {
            if (hasRole(role, account)) {
                _roles[role].members[account] = false;
                emit RoleRevoked(role, account, _msgSender());
            }
        }
    }
    
    // File: @openzeppelin/contracts/security/Pausable.sol
    
    
    pragma solidity ^0.8.0;
    
    
    /**
     * @dev Contract module which allows children to implement an emergency stop
     * mechanism that can be triggered by an authorized account.
     *
     * This module is used through inheritance. It will make available the
     * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
     * the functions of your contract. Note that they will not be pausable by
     * simply including this module, only once the modifiers are put in place.
     */
    abstract contract Pausable is Context {
        /**
         * @dev Emitted when the pause is triggered by `account`.
         */
        event Paused(address account);
    
        /**
         * @dev Emitted when the pause is lifted by `account`.
         */
        event Unpaused(address account);
    
        bool private _paused;
    
        /**
         * @dev Initializes the contract in unpaused state.
         */
        constructor() {
            _paused = false;
        }
    
        /**
         * @dev Returns true if the contract is paused, and false otherwise.
         */
        function paused() public view virtual returns (bool) {
            return _paused;
        }
    
        /**
         * @dev Modifier to make a function callable only when the contract is not paused.
         *
         * Requirements:
         *
         * - The contract must not be paused.
         */
        modifier whenNotPaused() {
            require(!paused(), "Pausable: paused");
            _;
        }
    
        /**
         * @dev Modifier to make a function callable only when the contract is paused.
         *
         * Requirements:
         *
         * - The contract must be paused.
         */
        modifier whenPaused() {
            require(paused(), "Pausable: not paused");
            _;
        }
    
        /**
         * @dev Triggers stopped state.
         *
         * Requirements:
         *
         * - The contract must not be paused.
         */
        function _pause() internal virtual whenNotPaused {
            _paused = true;
            emit Paused(_msgSender());
        }
    
        /**
         * @dev Returns to normal state.
         *
         * Requirements:
         *
         * - The contract must be paused.
         */
        function _unpause() internal virtual whenPaused {
            _paused = false;
            emit Unpaused(_msgSender());
        }
    }
    
    // File: @openzeppelin/contracts/utils/cryptography/ECDSA.sol
    
    
    pragma solidity ^0.8.0;
    
    /**
     * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
     *
     * These functions can be used to verify that a message was signed by the holder
     * of the private keys of a given address.
     */
    library ECDSA {
        /**
         * @dev Returns the address that signed a hashed message (`hash`) with
         * `signature`. This address can then be used for verification purposes.
         *
         * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
         * this function rejects them by requiring the `s` value to be in the lower
         * half order, and the `v` value to be either 27 or 28.
         *
         * IMPORTANT: `hash` _must_ be the result of a hash operation for the
         * verification to be secure: it is possible to craft signatures that
         * recover to arbitrary addresses for non-hashed data. A safe way to ensure
         * this is by receiving a hash of the original message (which may otherwise
         * be too long), and then calling {toEthSignedMessageHash} on it.
         *
         * Documentation for signature generation:
         * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
         * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
         */
        function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
            // Check the signature length
            // - case 65: r,s,v signature (standard)
            // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
            if (signature.length == 65) {
                bytes32 r;
                bytes32 s;
                uint8 v;
                // ecrecover takes the signature parameters, and the only way to get them
                // currently is to use assembly.
                assembly {
                    r := mload(add(signature, 0x20))
                    s := mload(add(signature, 0x40))
                    v := byte(0, mload(add(signature, 0x60)))
                }
                return recover(hash, v, r, s);
            } else if (signature.length == 64) {
                bytes32 r;
                bytes32 vs;
                // ecrecover takes the signature parameters, and the only way to get them
                // currently is to use assembly.
                assembly {
                    r := mload(add(signature, 0x20))
                    vs := mload(add(signature, 0x40))
                }
                return recover(hash, r, vs);
            } else {
                revert("ECDSA: invalid signature length");
            }
        }
    
        /**
         * @dev Overload of {ECDSA-recover} that receives the `r` and `vs` short-signature fields separately.
         *
         * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
         *
         * _Available since v4.2._
         */
        function recover(
            bytes32 hash,
            bytes32 r,
            bytes32 vs
        ) internal pure returns (address) {
            bytes32 s;
            uint8 v;
            assembly {
                s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
                v := add(shr(255, vs), 27)
            }
            return recover(hash, v, r, s);
        }
    
        /**
         * @dev Overload of {ECDSA-recover} that receives the `v`, `r` and `s` signature fields separately.
         */
        function recover(
            bytes32 hash,
            uint8 v,
            bytes32 r,
            bytes32 s
        ) internal pure returns (address) {
            // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
            // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
            // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
            // signatures from current libraries generate a unique signature with an s-value in the lower half order.
            //
            // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
            // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
            // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
            // these malleable signatures as well.
            require(
                uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0,
                "ECDSA: invalid signature 's' value"
            );
            require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value");
    
            // If the signature is valid (and not malleable), return the signer address
            address signer = ecrecover(hash, v, r, s);
            require(signer != address(0), "ECDSA: invalid signature");
    
            return signer;
        }
    
        /**
         * @dev Returns an Ethereum Signed Message, created from a `hash`. This
         * produces hash corresponding to the one signed with the
         * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
         * JSON-RPC method as part of EIP-191.
         *
         * See {recover}.
         */
        function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
            // 32 is the length in bytes of hash,
            // enforced by the type signature above
            return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
        }
    
        /**
         * @dev Returns an Ethereum Signed Typed Data, created from a
         * `domainSeparator` and a `structHash`. This produces hash corresponding
         * to the one signed with the
         * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
         * JSON-RPC method as part of EIP-712.
         *
         * See {recover}.
         */
        function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
            return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
        }
    }
    
    // File: @openzeppelin/contracts/utils/Address.sol
    
    
    pragma solidity ^0.8.0;
    
    /**
     * @dev Collection of functions related to the address type
     */
    library Address {
        /**
         * @dev Returns true if `account` is a contract.
         *
         * [IMPORTANT]
         * ====
         * It is unsafe to assume that an address for which this function returns
         * false is an externally-owned account (EOA) and not a contract.
         *
         * Among others, `isContract` will return false for the following
         * types of addresses:
         *
         *  - an externally-owned account
         *  - a contract in construction
         *  - an address where a contract will be created
         *  - an address where a contract lived, but was destroyed
         * ====
         */
        function isContract(address account) internal view returns (bool) {
            // This method relies on extcodesize, which returns 0 for contracts in
            // construction, since the code is only stored at the end of the
            // constructor execution.
    
            uint256 size;
            assembly {
                size := extcodesize(account)
            }
            return size > 0;
        }
    
        /**
         * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
         * `recipient`, forwarding all available gas and reverting on errors.
         *
         * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
         * of certain opcodes, possibly making contracts go over the 2300 gas limit
         * imposed by `transfer`, making them unable to receive funds via
         * `transfer`. {sendValue} removes this limitation.
         *
         * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
         *
         * IMPORTANT: because control is transferred to `recipient`, care must be
         * taken to not create reentrancy vulnerabilities. Consider using
         * {ReentrancyGuard} or the
         * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
         */
        function sendValue(address payable recipient, uint256 amount) internal {
            require(address(this).balance >= amount, "Address: insufficient balance");
    
            (bool success, ) = recipient.call{value: amount}("");
            require(success, "Address: unable to send value, recipient may have reverted");
        }
    
        /**
         * @dev Performs a Solidity function call using a low level `call`. A
         * plain `call` is an unsafe replacement for a function call: use this
         * function instead.
         *
         * If `target` reverts with a revert reason, it is bubbled up by this
         * function (like regular Solidity function calls).
         *
         * Returns the raw returned data. To convert to the expected return value,
         * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
         *
         * Requirements:
         *
         * - `target` must be a contract.
         * - calling `target` with `data` must not revert.
         *
         * _Available since v3.1._
         */
        function functionCall(address target, bytes memory data) internal returns (bytes memory) {
            return functionCall(target, data, "Address: low-level call failed");
        }
    
        /**
         * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
         * `errorMessage` as a fallback revert reason when `target` reverts.
         *
         * _Available since v3.1._
         */
        function functionCall(
            address target,
            bytes memory data,
            string memory errorMessage
        ) internal returns (bytes memory) {
            return functionCallWithValue(target, data, 0, errorMessage);
        }
    
        /**
         * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
         * but also transferring `value` wei to `target`.
         *
         * Requirements:
         *
         * - the calling contract must have an ETH balance of at least `value`.
         * - the called Solidity function must be `payable`.
         *
         * _Available since v3.1._
         */
        function functionCallWithValue(
            address target,
            bytes memory data,
            uint256 value
        ) internal returns (bytes memory) {
            return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
        }
    
        /**
         * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
         * with `errorMessage` as a fallback revert reason when `target` reverts.
         *
         * _Available since v3.1._
         */
        function functionCallWithValue(
            address target,
            bytes memory data,
            uint256 value,
            string memory errorMessage
        ) internal returns (bytes memory) {
            require(address(this).balance >= value, "Address: insufficient balance for call");
            require(isContract(target), "Address: call to non-contract");
    
            (bool success, bytes memory returndata) = target.call{value: value}(data);
            return _verifyCallResult(success, returndata, errorMessage);
        }
    
        /**
         * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
         * but performing a static call.
         *
         * _Available since v3.3._
         */
        function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
            return functionStaticCall(target, data, "Address: low-level static call failed");
        }
    
        /**
         * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
         * but performing a static call.
         *
         * _Available since v3.3._
         */
        function functionStaticCall(
            address target,
            bytes memory data,
            string memory errorMessage
        ) internal view returns (bytes memory) {
            require(isContract(target), "Address: static call to non-contract");
    
            (bool success, bytes memory returndata) = target.staticcall(data);
            return _verifyCallResult(success, returndata, errorMessage);
        }
    
        /**
         * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
         * but performing a delegate call.
         *
         * _Available since v3.4._
         */
        function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
            return functionDelegateCall(target, data, "Address: low-level delegate call failed");
        }
    
        /**
         * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
         * but performing a delegate call.
         *
         * _Available since v3.4._
         */
        function functionDelegateCall(
            address target,
            bytes memory data,
            string memory errorMessage
        ) internal returns (bytes memory) {
            require(isContract(target), "Address: delegate call to non-contract");
    
            (bool success, bytes memory returndata) = target.delegatecall(data);
            return _verifyCallResult(success, returndata, errorMessage);
        }
    
        function _verifyCallResult(
            bool success,
            bytes memory returndata,
            string memory errorMessage
        ) private 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: @openzeppelin/contracts/interfaces/IERC1271.sol
    
    
    pragma solidity ^0.8.0;
    
    /**
     * @dev Interface of the ERC1271 standard signature validation method for
     * contracts as defined in https://eips.ethereum.org/EIPS/eip-1271[ERC-1271].
     *
     * _Available since v4.1._
     */
    interface IERC1271 {
        /**
         * @dev Should return whether the signature provided is valid for the provided data
         * @param hash      Hash of the data to be signed
         * @param signature Signature byte array associated with _data
         */
        function isValidSignature(bytes32 hash, bytes memory signature) external view returns (bytes4 magicValue);
    }
    
    // File: @openzeppelin/contracts/utils/cryptography/SignatureChecker.sol
    
    
    pragma solidity ^0.8.0;
    
    
    
    
    /**
     * @dev Signature verification helper: Provide a single mechanism to verify both private-key (EOA) ECDSA signature and
     * ERC1271 contract sigantures. Using this instead of ECDSA.recover in your contract will make them compatible with
     * smart contract wallets such as Argent and Gnosis.
     *
     * Note: unlike ECDSA signatures, contract signature's are revocable, and the outcome of this function can thus change
     * through time. It could return true at block N and false at block N+1 (or the opposite).
     *
     * _Available since v4.1._
     */
    library SignatureChecker {
        function isValidSignatureNow(
            address signer,
            bytes32 hash,
            bytes memory signature
        ) internal view returns (bool) {
            if (Address.isContract(signer)) {
                try IERC1271(signer).isValidSignature(hash, signature) returns (bytes4 magicValue) {
                    return magicValue == IERC1271(signer).isValidSignature.selector;
                } catch {
                    return false;
                }
            } else {
                return ECDSA.recover(hash, signature) == signer;
            }
        }
    }
    
    // File: contracts/HuxleyComicsOps.sol
    
    pragma solidity 0.8.6;
    
    
    
    
    
    /**
     * @title HuxleyComicsOps
     * @dev This contract allows minting HuxleyComics tokens.
     * Users can pay to mint tokens when not paused.
     *
     */
    contract HuxleyComicsOps is Pausable, AccessControl {
        using SignatureChecker for address;
    
        address public trustedWallet_A;
        address public trustedWallet_B;
    
        // address used to sign whitelisted addresses
        address public signer;
    
        // ER721 Huxley Comics Token
        IHuxleyComics public huxleyComics;
    
        // Mapping from blacklisted addresses
        mapping(address => bool) public blacklisted;
    
        // Mapping from address to amount of tokens purchased per issue number
        mapping(address => mapping(uint256 => uint256)) public purchased;
    
        // Role that can call createIssue(), setBaseURI(), privateMint...Batch() and setBlacklisted()
        bytes32 public constant OPERATIONS_ROLE = keccak256("OPERATIONS_ROLE");
    
        event FundsTransfered(address _wallet, uint256 _amount);
        event IssueCreated(address _sender, uint256 _newIssue);
        event StartedBurn(address _sender);
        event StoppedBurn(address _sender);
        event IssueBaseURIUpdated(address _sender, string _uri);
        event FreeMintExecuted(address _sender);
        event FirstEditionMintExecuted(address _sender, uint256 _paid);
    
        /**
         * @dev Creates an instance of `HuxleyComicsOps`.
         *
         * 'msg.sender' gets the Admin role. '_trustedWallet_A' and '_trustedWallet_B' are wallets that will receive
         * funds. '_huxLeyComics' is the address of the HuxleyComics Token smart contract.
         *
         * Also sets contract to 'paused' state.
         */
        constructor(
            address _operationAddress,
            address _trustedWallet_A,
            address _trustedWallet_B,
            address _huxLeyComics
        ) {
            _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
            _setupRole(OPERATIONS_ROLE, _operationAddress);
    
            trustedWallet_A = _trustedWallet_A;
            trustedWallet_B = _trustedWallet_B;
    
            huxleyComics = IHuxleyComics(_huxLeyComics);
    
            signer = msg.sender;
    
            _pause();
        }
    
        /**
         * @dev It creates a new Issue. Checks if contract is 'paused' and pauses it otherwise.
         * It calls 'createNewIssue' from the HuxleyComics contract.
         * Only an address with Operations Role can call this function.
         *
         * Emits a {IssueCreated} event.
         *
         * @param _price Price for each token to be minted in wei
         * @param _goldSupply Total supply of Gold token
         * @param _firstEditionSupply Total supply of First Edition token
         * @param _holographicSupply Total supply of Holographic token
         * @param _startSerialNumberGold Initial serial number for Gold token
         * @param _startSerialNumberFirstEdition Initial serial number for First Edition token
         * @param _startSerialNumberHolographic Initial serial number for Holographic token
         * @param _maxPayableMintBatch Max amount of tokens that can be minted when calling batch functions (should not be greater than 100 so it won't run out of gas)
         * @param _uri Uri for the tokens of the issue
         */
        function createIssue(
            uint256 _price,
            uint256 _goldSupply,
            uint256 _firstEditionSupply,
            uint256 _holographicSupply,
            uint256 _startSerialNumberGold,
            uint256 _startSerialNumberFirstEdition,
            uint256 _startSerialNumberHolographic,
            uint256 _maxPayableMintBatch,
            string memory _uri
        ) external onlyRole(OPERATIONS_ROLE) {
            if (!paused()) {
                _pause();
            }
    
            huxleyComics.createNewIssue(
                _price,
                _goldSupply,
                _firstEditionSupply,
                _holographicSupply,
                _startSerialNumberGold,
                _startSerialNumberFirstEdition,
                _startSerialNumberHolographic,
                _maxPayableMintBatch,
                _uri
            );
    
            emit IssueCreated(msg.sender, huxleyComics.getCurrentIssue());
        }
    
        /**
         * @dev Sets a new uri for an Issue. Only an address with Operations Role can call this function.
         *      Emits a {IssueBaseURIUpdated} event.
         * @param _issueNumber issueNumber
         * @param _uri uri
         */
        function setBaseURI(uint256 _issueNumber, string memory _uri)
            external
            onlyRole(OPERATIONS_ROLE)
        {
            huxleyComics.setBaseURI(_issueNumber, _uri);
    
            emit IssueBaseURIUpdated(msg.sender, _uri);
        }
    
        /**
         * @dev Mint a free token of type First Edition for Issue #1. Whitelisted addresses can free mint one token.
         *      Emits a {FreeMintExecuted} event.
         * @param signature Message signed by 'signer' adddress to allow a wallet to free mint.
         */
        function freeMint(bytes memory signature) external {
            require(huxleyComics.getCurrentIssue() == 1, "Huxley: not issue 1");
            require(!blacklisted[msg.sender], "Huxley: blacklisted");
            require(isWhitelisted(signature), "Huxley: not whtl");
            require(isFirstToken(), "Huxley: not first");
    
            _mint(IHuxleyComics.TokenType.FirstEdition, 1);
    
            emit FreeMintExecuted(msg.sender);
        }
    
        /// @dev Mint a FirstEdition token for a price
        /// Emits a {FirstEditionMintExecuted} event.
        function payableMint() external payable whenNotPaused {
            uint256 price = huxleyComics.getCurrentPrice();
            require(price == msg.value, "Huxley: invalid price");
    
            uint256 maxPayableMintBatch = huxleyComics.getCurrentMaxPayableMintBatch();
    
            _mint(IHuxleyComics.TokenType.FirstEdition, maxPayableMintBatch);
    
            payment();
    
            emit FirstEditionMintExecuted(msg.sender, msg.value);
        }
    
        /**
         *  @dev Batch mint tokens for a price. Value should be equal to '_amountToMint1' x 'Issue.price'.
         *  @param _amountToMint Amount of tokens to be minted. 
                                 It should be greater than 0 and less or equal than 'Issue.maxPayableMintBatch'
         */
        function payableMintBatch(uint256 _amountToMint) external payable whenNotPaused {
            require(_amountToMint > 0, "Huxley: batch is 0");
    
            uint256 maxPayableMintBatch = huxleyComics.getCurrentMaxPayableMintBatch();
            require(_amountToMint <= maxPayableMintBatch, "Huxley: max batch");
    
            uint256 price = huxleyComics.getCurrentPrice();
            price = price * _amountToMint;
    
            require(price == msg.value, "Huxley: invalid price");
    
            for (uint256 i = 1; i <= _amountToMint; i++) {
                _mint(IHuxleyComics.TokenType.FirstEdition, maxPayableMintBatch);
            }
    
            payment();
        }
    
        /// @dev Split value paid for a token
        /// Emits two {FundsTransfered} events.
        function payment() internal {
            uint256 amount = (msg.value * 85) / 100;
            (bool success, ) = trustedWallet_A.call{value: amount}("");
            require(success, "HV: Transfer A failed");
            emit FundsTransfered(trustedWallet_A, amount);
    
            amount = msg.value - amount;
            (success, ) = trustedWallet_B.call{value: amount}("");
            require(success, "HV: Transfer B failed");
            emit FundsTransfered(trustedWallet_B, amount);
        }
    
        /// @dev Allows team to mint FirstEdition token
        function privateMintFirstEditionBatch(uint256 _amountToMint)
            external
            onlyRole(OPERATIONS_ROLE)
        {
            privateMintBatch(_amountToMint, IHuxleyComics.TokenType.FirstEdition);
        }
    
        /// @dev Allows team to mint Gold token
        function privateMintGoldBatch(uint256 _amountToMint) external onlyRole(OPERATIONS_ROLE) {
            privateMintBatch(_amountToMint, IHuxleyComics.TokenType.Gold);
        }
    
        /// @dev Allows team to mint Holographic token
        function privateMintHolographicBatch(uint256 _amountToMint)
            external
            onlyRole(OPERATIONS_ROLE)
        {
            privateMintBatch(_amountToMint, IHuxleyComics.TokenType.Holographic);
        }
    
        /// @dev Batch mint tokens. It should not be greater than 100 to avoid running out of gas
        function privateMintBatch(uint256 _amountToMint, IHuxleyComics.TokenType _tokenType) internal {
            require(_amountToMint > 0, "Huxley: amount is 0");
            for (uint256 i = 1; i <= _amountToMint; i++) {
                _privateMint(_tokenType, true, 0);
            }
        }
    
        /**
         * @dev Mints a token of an specific 'Token.Type'. It can be 'FirstEdition', 'Gold' or 'Holographic'
         * @param _tokenType Token Type that will be minted
         */
        function _mint(IHuxleyComics.TokenType _tokenType, uint256 _maxAmount) internal {
            _privateMint(_tokenType, false, _maxAmount);
        }
    
        /**
         * @dev Mints a token of a specific 'Token.Type'. It can be 'FirstEdition', 'Gold' or ' 'Holographic'
         * @param _tokenType Token Type that will be minted
         */
        function _privateMint(IHuxleyComics.TokenType _tokenType, bool _isPrivateMint, uint256 _maxAmount) internal {
            if(!_isPrivateMint){
                uint256 totalTokenspurchased = purchased[msg.sender][huxleyComics.getCurrentIssue()];
                require(totalTokenspurchased < _maxAmount, "Huxley: over max amount");
                
                // update total amount of tokens purchased for current issue
                purchased[msg.sender][huxleyComics.getCurrentIssue()] = totalTokenspurchased + 1;
            }
    
            // mint and get token id
            uint256 tokenId = huxleyComics.safeMint(msg.sender);
            huxleyComics.setTokenDetails(tokenId, _tokenType);
        }
    
        // Setup functions
    
        /**
         * @dev Updates address of 'trustedWallet_A'
         * @param _trustedWallet  New address for 'trustedWallet_A'
         */
        function setTrustedWallet_A(address _trustedWallet) external onlyRole(DEFAULT_ADMIN_ROLE) {
            trustedWallet_A = _trustedWallet;
        }
    
        /**
         * @dev Updates address of 'trustedWallet_B'
         * @param _trustedWallet  New address for 'trustedWallet_B'
         */
        function setTrustedWallet_B(address _trustedWallet) external onlyRole(DEFAULT_ADMIN_ROLE) {
            trustedWallet_B = _trustedWallet;
        }
    
        /**
         * @dev Updates address of 'signer'
         * @param _signer  New address for 'signer'
         */
        function setSigner(address _signer) external onlyRole(DEFAULT_ADMIN_ROLE) {
            signer = _signer;
        }
    
        /// @dev Returns if user already has a token
        function isFirstToken() internal view returns (bool) {
            uint256 balance = huxleyComics.balanceOf(msg.sender);
            return balance == 0;
        }
    
        /// @dev Returns if user is whitelisted to free mint 1 token.
        function isWhitelisted(bytes memory signature) internal view returns (bool) {
            bytes32 result = keccak256(abi.encodePacked(msg.sender));
            bytes32 hash = keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", result));
            return signer.isValidSignatureNow(hash, signature);
        }
    
        /**
         * @dev Sets if an address is blacklist or not
         * @param _addr Address to update in the blacklist list
         * @param _value Use 'True' to blacklist '_addr', 'False' otherwise
         */
        function setBlacklisted(address _addr, bool _value) external onlyRole(OPERATIONS_ROLE) {
            blacklisted[_addr] = _value;
        }
    
        /// @dev Pause payableMint()
        function pause() external onlyRole(DEFAULT_ADMIN_ROLE) {
            _pause();
        }
    
        /// @dev Unpause payableMint()
        function unpause() external onlyRole(DEFAULT_ADMIN_ROLE) {
            _unpause();
        }
    
        /// @dev Start the possibility to burn tokens
        /// Emits {StartedBurn} event.
        function startBurn() external onlyRole(DEFAULT_ADMIN_ROLE) {
            huxleyComics.setCanBurn(true);
            emit StartedBurn(msg.sender);
        }
    
        /// @dev Stop the possibility to burn tokens
        /// Emits {StoppedBurn} event.
        function stopBurn() external onlyRole(DEFAULT_ADMIN_ROLE) {
            huxleyComics.setCanBurn(false);
            emit StoppedBurn(msg.sender);
        }
        // End Burn Requirement
    }

    File 2 of 2: HuxleyComics
    // File: @openzeppelin/contracts/utils/introspection/IERC165.sol
    
    // SPDX-License-Identifier: MIT
    
    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: @openzeppelin/contracts/token/ERC721/IERC721.sol
    
    
    pragma solidity ^0.8.0;
    
    
    /**
     * @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: contracts/interfaces/IHuxleyComics.sol
    
    pragma solidity 0.8.6;
    
     
    interface IHuxleyComics is IERC721 {
        struct Issue {
            uint256 price;
            uint256 goldSupplyLeft;
            uint256 firstEditionSupplyLeft;
            uint256 holographicSupplyLeft;
            uint256 serialNumberToMintGold;
            uint256 serialNumberToMintFirstEdition;
            uint256 serialNumberToMintHolographic;
            uint256 maxPayableMintBatch;
            string uri;
            bool exist;
        }
    
        struct Token {
            uint256 serialNumber;
            uint256 issueNumber;
            TokenType tokenType;
        }
    
        enum TokenType {FirstEdition, Gold, Holographic}
    
        function safeMint(address _to) external returns (uint256);
    
        function getCurrentIssue() external returns (uint256 _currentIssue);
        function getCurrentPrice() external returns (uint256 _currentPrice);
        function getCurrentMaxPayableMintBatch() external returns (uint256 _currentMaxPayableMintBatch);
    
        function createNewIssue(
            uint256 _price,
            uint256 _goldSupply,
            uint256 _firstEditionSupply,
            uint256 _holographicSupply,
            uint256 _startSerialNumberGold,
            uint256 _startSerialNumberFirstEdition,
            uint256 _startSerialNumberHolographic,
            uint256 _maxPaybleMintBatch,
            string memory _uri
        ) external;
    
        function getIssue(uint256 _issueNumber) external returns (Issue memory _issue);
    
        function getToken(uint256 _tokenId) external returns (Token memory _token);
    
        function setTokenDetails(uint256 _tokenId, TokenType _tokenType) external;
    
        function setBaseURI(uint256 _issueNumber, string memory _uri) external;
    
        function setCanBurn(bool _canBurn) external;
    }
    
    // File: @openzeppelin/contracts/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: @openzeppelin/contracts/access/Ownable.sol
    
    
    pragma solidity ^0.8.0;
    
    
    /**
     * @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() {
            _setOwner(_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 {
            _setOwner(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");
            _setOwner(newOwner);
        }
    
        function _setOwner(address newOwner) private {
            address oldOwner = _owner;
            _owner = newOwner;
            emit OwnershipTransferred(oldOwner, newOwner);
        }
    }
    
    // File: @openzeppelin/contracts/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: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol
    
    
    pragma solidity ^0.8.0;
    
    
    /**
     * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
     * @dev See https://eips.ethereum.org/EIPS/eip-721
     */
    interface IERC721Metadata is IERC721 {
        /**
         * @dev Returns the token collection name.
         */
        function name() external view returns (string memory);
    
        /**
         * @dev Returns the token collection symbol.
         */
        function symbol() external view returns (string memory);
    
        /**
         * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
         */
        function tokenURI(uint256 tokenId) external view returns (string memory);
    }
    
    // File: @openzeppelin/contracts/utils/Address.sol
    
    
    pragma solidity ^0.8.0;
    
    /**
     * @dev Collection of functions related to the address type
     */
    library Address {
        /**
         * @dev Returns true if `account` is a contract.
         *
         * [IMPORTANT]
         * ====
         * It is unsafe to assume that an address for which this function returns
         * false is an externally-owned account (EOA) and not a contract.
         *
         * Among others, `isContract` will return false for the following
         * types of addresses:
         *
         *  - an externally-owned account
         *  - a contract in construction
         *  - an address where a contract will be created
         *  - an address where a contract lived, but was destroyed
         * ====
         */
        function isContract(address account) internal view returns (bool) {
            // This method relies on extcodesize, which returns 0 for contracts in
            // construction, since the code is only stored at the end of the
            // constructor execution.
    
            uint256 size;
            assembly {
                size := extcodesize(account)
            }
            return size > 0;
        }
    
        /**
         * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
         * `recipient`, forwarding all available gas and reverting on errors.
         *
         * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
         * of certain opcodes, possibly making contracts go over the 2300 gas limit
         * imposed by `transfer`, making them unable to receive funds via
         * `transfer`. {sendValue} removes this limitation.
         *
         * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
         *
         * IMPORTANT: because control is transferred to `recipient`, care must be
         * taken to not create reentrancy vulnerabilities. Consider using
         * {ReentrancyGuard} or the
         * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
         */
        function sendValue(address payable recipient, uint256 amount) internal {
            require(address(this).balance >= amount, "Address: insufficient balance");
    
            (bool success, ) = recipient.call{value: amount}("");
            require(success, "Address: unable to send value, recipient may have reverted");
        }
    
        /**
         * @dev Performs a Solidity function call using a low level `call`. A
         * plain `call` is an unsafe replacement for a function call: use this
         * function instead.
         *
         * If `target` reverts with a revert reason, it is bubbled up by this
         * function (like regular Solidity function calls).
         *
         * Returns the raw returned data. To convert to the expected return value,
         * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
         *
         * Requirements:
         *
         * - `target` must be a contract.
         * - calling `target` with `data` must not revert.
         *
         * _Available since v3.1._
         */
        function functionCall(address target, bytes memory data) internal returns (bytes memory) {
            return functionCall(target, data, "Address: low-level call failed");
        }
    
        /**
         * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
         * `errorMessage` as a fallback revert reason when `target` reverts.
         *
         * _Available since v3.1._
         */
        function functionCall(
            address target,
            bytes memory data,
            string memory errorMessage
        ) internal returns (bytes memory) {
            return functionCallWithValue(target, data, 0, errorMessage);
        }
    
        /**
         * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
         * but also transferring `value` wei to `target`.
         *
         * Requirements:
         *
         * - the calling contract must have an ETH balance of at least `value`.
         * - the called Solidity function must be `payable`.
         *
         * _Available since v3.1._
         */
        function functionCallWithValue(
            address target,
            bytes memory data,
            uint256 value
        ) internal returns (bytes memory) {
            return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
        }
    
        /**
         * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
         * with `errorMessage` as a fallback revert reason when `target` reverts.
         *
         * _Available since v3.1._
         */
        function functionCallWithValue(
            address target,
            bytes memory data,
            uint256 value,
            string memory errorMessage
        ) internal returns (bytes memory) {
            require(address(this).balance >= value, "Address: insufficient balance for call");
            require(isContract(target), "Address: call to non-contract");
    
            (bool success, bytes memory returndata) = target.call{value: value}(data);
            return _verifyCallResult(success, returndata, errorMessage);
        }
    
        /**
         * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
         * but performing a static call.
         *
         * _Available since v3.3._
         */
        function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
            return functionStaticCall(target, data, "Address: low-level static call failed");
        }
    
        /**
         * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
         * but performing a static call.
         *
         * _Available since v3.3._
         */
        function functionStaticCall(
            address target,
            bytes memory data,
            string memory errorMessage
        ) internal view returns (bytes memory) {
            require(isContract(target), "Address: static call to non-contract");
    
            (bool success, bytes memory returndata) = target.staticcall(data);
            return _verifyCallResult(success, returndata, errorMessage);
        }
    
        /**
         * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
         * but performing a delegate call.
         *
         * _Available since v3.4._
         */
        function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
            return functionDelegateCall(target, data, "Address: low-level delegate call failed");
        }
    
        /**
         * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
         * but performing a delegate call.
         *
         * _Available since v3.4._
         */
        function functionDelegateCall(
            address target,
            bytes memory data,
            string memory errorMessage
        ) internal returns (bytes memory) {
            require(isContract(target), "Address: delegate call to non-contract");
    
            (bool success, bytes memory returndata) = target.delegatecall(data);
            return _verifyCallResult(success, returndata, errorMessage);
        }
    
        function _verifyCallResult(
            bool success,
            bytes memory returndata,
            string memory errorMessage
        ) private 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: @openzeppelin/contracts/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: @openzeppelin/contracts/utils/introspection/ERC165.sol
    
    
    pragma solidity ^0.8.0;
    
    
    /**
     * @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: @openzeppelin/contracts/token/ERC721/ERC721.sol
    
    
    pragma solidity ^0.8.0;
    
    
    
    
    
    
    
    
    /**
     * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
     * the Metadata extension, but not including the Enumerable extension, which is available separately as
     * {ERC721Enumerable}.
     */
    contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
        using Address for address;
        using Strings for uint256;
    
        // Token name
        string private _name;
    
        // Token symbol
        string private _symbol;
    
        // Mapping from token ID to owner address
        mapping(uint256 => address) private _owners;
    
        // Mapping owner address to token count
        mapping(address => uint256) private _balances;
    
        // Mapping from token ID to approved address
        mapping(uint256 => address) private _tokenApprovals;
    
        // Mapping from owner to operator approvals
        mapping(address => mapping(address => bool)) private _operatorApprovals;
    
        /**
         * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
         */
        constructor(string memory name_, string memory symbol_) {
            _name = name_;
            _symbol = symbol_;
        }
    
        /**
         * @dev See {IERC165-supportsInterface}.
         */
        function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
            return
                interfaceId == type(IERC721).interfaceId ||
                interfaceId == type(IERC721Metadata).interfaceId ||
                super.supportsInterface(interfaceId);
        }
    
        /**
         * @dev See {IERC721-balanceOf}.
         */
        function balanceOf(address owner) public view virtual override returns (uint256) {
            require(owner != address(0), "ERC721: balance query for the zero address");
            return _balances[owner];
        }
    
        /**
         * @dev See {IERC721-ownerOf}.
         */
        function ownerOf(uint256 tokenId) public view virtual override returns (address) {
            address owner = _owners[tokenId];
            require(owner != address(0), "ERC721: owner query for nonexistent token");
            return owner;
        }
    
        /**
         * @dev See {IERC721Metadata-name}.
         */
        function name() public view virtual override returns (string memory) {
            return _name;
        }
    
        /**
         * @dev See {IERC721Metadata-symbol}.
         */
        function symbol() public view virtual override returns (string memory) {
            return _symbol;
        }
    
        /**
         * @dev See {IERC721Metadata-tokenURI}.
         */
        function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
            require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
    
            string memory baseURI = _baseURI();
            return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
        }
    
        /**
         * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
         * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
         * by default, can be overriden in child contracts.
         */
        function _baseURI() internal view virtual returns (string memory) {
            return "";
        }
    
        /**
         * @dev See {IERC721-approve}.
         */
        function approve(address to, uint256 tokenId) public virtual override {
            address owner = ERC721.ownerOf(tokenId);
            require(to != owner, "ERC721: approval to current owner");
    
            require(
                _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
                "ERC721: approve caller is not owner nor approved for all"
            );
    
            _approve(to, tokenId);
        }
    
        /**
         * @dev See {IERC721-getApproved}.
         */
        function getApproved(uint256 tokenId) public view virtual override returns (address) {
            require(_exists(tokenId), "ERC721: approved query for nonexistent token");
    
            return _tokenApprovals[tokenId];
        }
    
        /**
         * @dev See {IERC721-setApprovalForAll}.
         */
        function setApprovalForAll(address operator, bool approved) public virtual override {
            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);
        }
    
        /**
         * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
         * are aware of the ERC721 protocol to prevent tokens from being forever locked.
         *
         * `_data` is additional data, it has no specified format and it is sent in call to `to`.
         *
         * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
         * implement alternative mechanisms to perform token transfer, such as signature-based.
         *
         * Requirements:
         *
         * - `from` cannot be the zero address.
         * - `to` cannot be the zero address.
         * - `tokenId` token must exist and be owned by `from`.
         * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
         *
         * Emits a {Transfer} event.
         */
        function _safeTransfer(
            address from,
            address to,
            uint256 tokenId,
            bytes memory _data
        ) internal virtual {
            _transfer(from, to, tokenId);
            require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
        }
    
        /**
         * @dev Returns whether `tokenId` exists.
         *
         * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
         *
         * Tokens start existing when they are minted (`_mint`),
         * and stop existing when they are burned (`_burn`).
         */
        function _exists(uint256 tokenId) internal view virtual returns (bool) {
            return _owners[tokenId] != address(0);
        }
    
        /**
         * @dev Returns whether `spender` is allowed to manage `tokenId`.
         *
         * Requirements:
         *
         * - `tokenId` must exist.
         */
        function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
            require(_exists(tokenId), "ERC721: operator query for nonexistent token");
            address owner = ERC721.ownerOf(tokenId);
            return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
        }
    
        /**
         * @dev Safely mints `tokenId` and transfers it to `to`.
         *
         * Requirements:
         *
         * - `tokenId` must not exist.
         * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
         *
         * Emits a {Transfer} event.
         */
        function _safeMint(address to, uint256 tokenId) internal virtual {
            _safeMint(to, tokenId, "");
        }
    
        /**
         * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
         * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
         */
        function _safeMint(
            address to,
            uint256 tokenId,
            bytes memory _data
        ) internal virtual {
            _mint(to, tokenId);
            require(
                _checkOnERC721Received(address(0), to, tokenId, _data),
                "ERC721: transfer to non ERC721Receiver implementer"
            );
        }
    
        /**
         * @dev Mints `tokenId` and transfers it to `to`.
         *
         * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
         *
         * Requirements:
         *
         * - `tokenId` must not exist.
         * - `to` cannot be the zero address.
         *
         * Emits a {Transfer} event.
         */
        function _mint(address to, uint256 tokenId) internal virtual {
            require(to != address(0), "ERC721: mint to the zero address");
            require(!_exists(tokenId), "ERC721: token already minted");
    
            _beforeTokenTransfer(address(0), to, tokenId);
    
            _balances[to] += 1;
            _owners[tokenId] = to;
    
            emit Transfer(address(0), to, tokenId);
        }
    
        /**
         * @dev Destroys `tokenId`.
         * The approval is cleared when the token is burned.
         *
         * Requirements:
         *
         * - `tokenId` must exist.
         *
         * Emits a {Transfer} event.
         */
        function _burn(uint256 tokenId) internal virtual {
            address owner = ERC721.ownerOf(tokenId);
    
            _beforeTokenTransfer(owner, address(0), tokenId);
    
            // Clear approvals
            _approve(address(0), tokenId);
    
            _balances[owner] -= 1;
            delete _owners[tokenId];
    
            emit Transfer(owner, address(0), tokenId);
        }
    
        /**
         * @dev Transfers `tokenId` from `from` to `to`.
         *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
         *
         * Requirements:
         *
         * - `to` cannot be the zero address.
         * - `tokenId` token must be owned by `from`.
         *
         * Emits a {Transfer} event.
         */
        function _transfer(
            address from,
            address to,
            uint256 tokenId
        ) internal virtual {
            require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
            require(to != address(0), "ERC721: transfer to the zero address");
    
            _beforeTokenTransfer(from, to, tokenId);
    
            // Clear approvals from the previous owner
            _approve(address(0), tokenId);
    
            _balances[from] -= 1;
            _balances[to] += 1;
            _owners[tokenId] = to;
    
            emit Transfer(from, to, tokenId);
        }
    
        /**
         * @dev Approve `to` to operate on `tokenId`
         *
         * Emits a {Approval} event.
         */
        function _approve(address to, uint256 tokenId) internal virtual {
            _tokenApprovals[tokenId] = to;
            emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
        }
    
        /**
         * @dev 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(to).onERC721Received.selector;
                } catch (bytes memory reason) {
                    if (reason.length == 0) {
                        revert("ERC721: transfer to non ERC721Receiver implementer");
                    } else {
                        assembly {
                            revert(add(32, reason), mload(reason))
                        }
                    }
                }
            } else {
                return true;
            }
        }
    
        /**
         * @dev Hook that is called before any token transfer. This includes minting
         * and burning.
         *
         * Calling conditions:
         *
         * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
         * transferred to `to`.
         * - When `from` is zero, `tokenId` will be minted for `to`.
         * - When `to` is zero, ``from``'s `tokenId` will be burned.
         * - `from` and `to` are never both zero.
         *
         * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
         */
        function _beforeTokenTransfer(
            address from,
            address to,
            uint256 tokenId
        ) internal virtual {}
    }
    
    // File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol
    
    
    pragma solidity ^0.8.0;
    
    
    /**
     * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
     * @dev See https://eips.ethereum.org/EIPS/eip-721
     */
    interface IERC721Enumerable is IERC721 {
        /**
         * @dev Returns the total amount of tokens stored by the contract.
         */
        function totalSupply() external view returns (uint256);
    
        /**
         * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
         * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
         */
        function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);
    
        /**
         * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
         * Use along with {totalSupply} to enumerate all tokens.
         */
        function tokenByIndex(uint256 index) external view returns (uint256);
    }
    
    // File: @openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol
    
    
    pragma solidity ^0.8.0;
    
    
    
    /**
     * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
     * enumerability of all the token ids in the contract as well as all token ids owned by each
     * account.
     */
    abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
        // Mapping from owner to list of owned token IDs
        mapping(address => mapping(uint256 => uint256)) private _ownedTokens;
    
        // Mapping from token ID to index of the owner tokens list
        mapping(uint256 => uint256) private _ownedTokensIndex;
    
        // Array with all token ids, used for enumeration
        uint256[] private _allTokens;
    
        // Mapping from token id to position in the allTokens array
        mapping(uint256 => uint256) private _allTokensIndex;
    
        /**
         * @dev See {IERC165-supportsInterface}.
         */
        function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
            return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
        }
    
        /**
         * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
         */
        function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
            require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
            return _ownedTokens[owner][index];
        }
    
        /**
         * @dev See {IERC721Enumerable-totalSupply}.
         */
        function totalSupply() public view virtual override returns (uint256) {
            return _allTokens.length;
        }
    
        /**
         * @dev See {IERC721Enumerable-tokenByIndex}.
         */
        function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
            require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
            return _allTokens[index];
        }
    
        /**
         * @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` cannot be the zero address.
         * - `to` cannot be the zero address.
         *
         * 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 override {
            super._beforeTokenTransfer(from, to, tokenId);
    
            if (from == address(0)) {
                _addTokenToAllTokensEnumeration(tokenId);
            } else if (from != to) {
                _removeTokenFromOwnerEnumeration(from, tokenId);
            }
            if (to == address(0)) {
                _removeTokenFromAllTokensEnumeration(tokenId);
            } else if (to != from) {
                _addTokenToOwnerEnumeration(to, tokenId);
            }
        }
    
        /**
         * @dev Private function to add a token to this extension's ownership-tracking data structures.
         * @param to address representing the new owner of the given token ID
         * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
         */
        function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
            uint256 length = ERC721.balanceOf(to);
            _ownedTokens[to][length] = tokenId;
            _ownedTokensIndex[tokenId] = length;
        }
    
        /**
         * @dev Private function to add a token to this extension's token tracking data structures.
         * @param tokenId uint256 ID of the token to be added to the tokens list
         */
        function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
            _allTokensIndex[tokenId] = _allTokens.length;
            _allTokens.push(tokenId);
        }
    
        /**
         * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
         * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
         * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
         * This has O(1) time complexity, but alters the order of the _ownedTokens array.
         * @param from address representing the previous owner of the given token ID
         * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
         */
        function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
            // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
            // then delete the last slot (swap and pop).
    
            uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
            uint256 tokenIndex = _ownedTokensIndex[tokenId];
    
            // When the token to delete is the last token, the swap operation is unnecessary
            if (tokenIndex != lastTokenIndex) {
                uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
    
                _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
                _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
            }
    
            // This also deletes the contents at the last position of the array
            delete _ownedTokensIndex[tokenId];
            delete _ownedTokens[from][lastTokenIndex];
        }
    
        /**
         * @dev Private function to remove a token from this extension's token tracking data structures.
         * This has O(1) time complexity, but alters the order of the _allTokens array.
         * @param tokenId uint256 ID of the token to be removed from the tokens list
         */
        function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
            // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
            // then delete the last slot (swap and pop).
    
            uint256 lastTokenIndex = _allTokens.length - 1;
            uint256 tokenIndex = _allTokensIndex[tokenId];
    
            // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
            // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
            // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
            uint256 lastTokenId = _allTokens[lastTokenIndex];
    
            _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
    
            // This also deletes the contents at the last position of the array
            delete _allTokensIndex[tokenId];
            _allTokens.pop();
        }
    }
    
    // File: @openzeppelin/contracts/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 make 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: contracts/HuxleyComics.sol
    
    pragma solidity 0.8.6;
    
    
    
    
    
    
    contract HuxleyComics is ERC721Enumerable, IHuxleyComics, ReentrancyGuard, Ownable {
        using Strings for uint256;
    
        // address of the HuxleyComicsOps contract that can mint tokens
        address public minter;
    
        // control if tokens can be burned or not. Default is false
        bool public canBurn;
    
        // Last token id minted
        uint256 public tokenId;
    
        //Issue being minted
        uint256 private currentIssue;
    
        //Price of token to be minted
        uint256 private currentPrice;
    
        //Max amount of tokens that can be mined from current issue
        uint256 private currentMaxPayableMintBatch;
    
        // mapping of Issues - issue number -> Isssue
        mapping(uint256 => Issue) private issues;
    
        // mapping of redemptions - tokenId -> true/false
        mapping(uint256 => bool) public redemptions;
    
        // mapping of Tokens - tokenId -> Token
        mapping(uint256 => Token) private tokens;
    
        /**
         * @dev Modifier that checks that address is minter. Reverts
         * if sender is not the minter
         */
        modifier onlyMinter() {
            require(msg.sender == minter, "HT: Only minter");
            _;
        }
    
        /**
         * @dev Initializes the contract by setting a `name` and a `symbol` to the token.
         */
        constructor() ERC721("HUXLEY Comics", "HUXLEY") {}
    
        /**
         * @dev Safely mints a token. Increments 'tokenId' by 1 and calls super._safeMint()
         *
         * @param to Address that will be the owner of the token
         */
        function safeMint(address to) external override onlyMinter() nonReentrant returns (uint256 _tokenId) {
            tokenId++;
            super._safeMint(to, tokenId);
            return tokenId;
        }
    
        /**
         * @dev Burns a token. Can only be called by token Owner
         *
         * @param _tokenId Token that will be burned
         */
        function burn(uint256 _tokenId) external {
            require(canBurn, "HT: is not burnable");
            require(ownerOf(_tokenId) == msg.sender, "HT: Not owner");
            super._burn(_tokenId);
        }
    
        /**
         * @dev It creates a new Issue. Only 'minter' can call this function.
         *
         * @param _price Price for each token to be minted in wei
         * @param _goldSupply Total supply of Gold token
         * @param _firstEditionSupply Total supply of First Edition token
         * @param _holographicSupply Total supply of Holographic token
         * @param _startSerialNumberGold Initial serial number for Gold token
         * @param _startSerialNumberFirstEdition Initial serial number for First Edition token
         * @param _startSerialNumberHolographic Initial serial number for Holographic token
         * @param _maxPayableMintBatch Max amount of tokens that can be minted when calling batch functions (should not be greater than 100 so it won't run out of gas)
         * @param _uri Uri for the tokens of the issue
         */
        function createNewIssue(
            uint256 _price,
            uint256 _goldSupply,
            uint256 _firstEditionSupply,
            uint256 _holographicSupply,
            uint256 _startSerialNumberGold,
            uint256 _startSerialNumberFirstEdition,
            uint256 _startSerialNumberHolographic,
            uint256 _maxPayableMintBatch,
            string memory _uri
        ) external override onlyMinter {
            currentIssue = currentIssue + 1;
            currentPrice = _price;
            currentMaxPayableMintBatch = _maxPayableMintBatch;
    
            Issue storage issue = issues[currentIssue];
    
            issue.price = _price;
            issue.goldSupplyLeft = _goldSupply;
            issue.firstEditionSupplyLeft = _firstEditionSupply;
            issue.holographicSupplyLeft = _holographicSupply;
            issue.serialNumberToMintGold = _startSerialNumberGold;
            issue.serialNumberToMintFirstEdition = _startSerialNumberFirstEdition;
            issue.serialNumberToMintHolographic = _startSerialNumberHolographic;
            issue.maxPayableMintBatch = _maxPayableMintBatch;
            issue.uri = _uri;
            issue.exist = true;
        }
    
        /**
         * @dev Returns whether `issueNumber` exists.
         *
         * Issue can be created via {createNewIssue}.
         *
         */
        function _issueExists(uint256 _issueNumber) internal view virtual returns (bool) {
            return issues[_issueNumber].exist ? true : false;
        }
    
        /**
         * @dev It sets details for the token. It sets the issue number, serial number and token type.
         *     It also updates supply left of the token.
         *
         * Emits a {IssueCreated} event.
         *
         * @param _tokenId tokenID
         * @param _tokenType tokenType
         */
        function setTokenDetails(uint256 _tokenId, TokenType _tokenType) external override onlyMinter {
            Token storage token = tokens[_tokenId];
            token.issueNumber = currentIssue;
    
            Issue storage issue = issues[currentIssue];
            // can mint Gold, FirstEdition and Holographic
            if (_tokenType == TokenType.Gold) {
                uint256 goldSupplyLeft = issue.goldSupplyLeft;
                require(goldSupplyLeft > 0, "HT: no gold");
    
                issue.goldSupplyLeft = goldSupplyLeft - 1;
                uint256 serialNumberGold = issue.serialNumberToMintGold;
                issue.serialNumberToMintGold = serialNumberGold + 1; //next mint
    
                token.tokenType = TokenType.Gold;
                token.serialNumber = serialNumberGold;
            } else if (_tokenType == TokenType.FirstEdition) {
                uint256 firstEditionSupplyLeft = issue.firstEditionSupplyLeft;
                require(firstEditionSupplyLeft > 0, "HT: no firstEdition");
    
                issue.firstEditionSupplyLeft = firstEditionSupplyLeft - 1;
                uint256 serialNumberFirstEdition = issue.serialNumberToMintFirstEdition;
                issue.serialNumberToMintFirstEdition = serialNumberFirstEdition + 1; //next mint
    
                token.tokenType = TokenType.FirstEdition;
                token.serialNumber = serialNumberFirstEdition;
            } else if (_tokenType == TokenType.Holographic) {
                uint256 holographicSupplyLeft = issue.holographicSupplyLeft;
                require(holographicSupplyLeft > 0, "HT: no holographic");
    
                issue.holographicSupplyLeft = holographicSupplyLeft - 1;
                uint256 serialNumberHolographic = issue.serialNumberToMintHolographic;
                issue.serialNumberToMintHolographic = serialNumberHolographic + 1; //next mint
    
                token.tokenType = TokenType.Holographic;
                token.serialNumber = serialNumberHolographic;
            } else {
                revert();
            }
        }
    
        /// @dev Returns URI for the token. Each Issue number has a base uri.
        function tokenURI(uint256 _tokenId) public view virtual override returns (string memory) {
            require(_exists(_tokenId), "UT: invalid token");
    
            Token memory token = tokens[_tokenId];
            uint256 issueNumber = token.issueNumber;
            require(issueNumber > 0, "HT: invalid issue");
    
            Issue memory issue = issues[issueNumber];
            string memory baseURI = issue.uri;
    
            return
                bytes(baseURI).length > 0
                    ? string(abi.encodePacked(baseURI, _tokenId.toString()))
                    : "";
        }
    
        /**
         * @dev Sets URI for an Issue.
         *
         * Issue can be created via {createNewIssue} by the Minter.
         *
         */
        function setBaseURI(uint256 _issueNumber, string memory _uri) external override onlyMinter {
            require(_issueExists(_issueNumber), "UT: invalid issue");
    
            Issue storage issue = issues[_issueNumber];
            issue.uri = _uri;
        }
    
        /// @dev Returns Issue that can be minted.
        function getCurrentIssue() external view override returns (uint256 _currentIssue) {
            return currentIssue;
        }
    
        /// @dev Returns Price of token that can be minted.
        function getCurrentPrice() external view override returns (uint256 _currentPrice) {
            return currentPrice;
        }
    
        /// @dev Returns Max Amount of First Edition tokens an address can pay to mint.
        function getCurrentMaxPayableMintBatch() external view override returns (uint256 _currentMaxaPaybleMintBatch) {
            return currentMaxPayableMintBatch;
        }
    
        /**
         * @dev Returns details of an Issue: 'price', 'goldSupplyLeft', 'firstEditionSupplyLeft,
         *   'holographicSupplyLeft', 'serialNumberToMintGold', 'serialNumberToMintFirstEdition',
         *   'serialNumberToMintHolographic', 'MaxPayableMintBatch', 'uri' and 'exist'.
         *
         */
        function getIssue(uint256 _issueNumber) external view override returns (Issue memory _issue) {
            return issues[_issueNumber];
        }
    
        /// @dev Returns token details: 'serialNumber', 'issueNumber' and 'TokenType'
        function getToken(uint256 _tokenId) external view override returns (Token memory _token) {
            return tokens[_tokenId];
        }
    
        /// @dev User can redeem a copy
        function redeemCopy(uint256 _tokenId) external {
            require(ownerOf(_tokenId) == msg.sender, "HT: Not owner");
            require(redemptions[_tokenId] == false, "HT: already redeemed");
    
            redemptions[_tokenId] = true;
        }
    
        // Setup functions
        /// @dev Sets new minter address. Only Owner can call this function.
        function updateMinter(address _minter) external onlyOwner {
            minter = _minter;
        }
    
        /// @dev Sets if it is allowed to burn tokens. Default is 'false'. Only Minter can call this function.
        function setCanBurn(bool _canBurn) external override onlyMinter {
            canBurn = _canBurn;
        }
        // End setup functions
    }