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/**
 *Submitted for verification at gnosisscan.io on 2022-08-04
*/

/*
 * Crypto stamp Collections Factory (Layer 2)
 * Factory and core ERC721 contract for the Collections of ERC721 and ERC1155 assets,
 * for example digital-physical collectible postage stamps
 *
 * Developed by Capacity Blockchain Solutions GmbH <capacity.at>
 * for Österreichische Post AG <post.at>
 *
 * Any usage of or interaction with this set of contracts is subject to the
 * Terms & Conditions available at https://crypto.post.at/
 */

// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.0;

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol

/**
 * @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

/**
 * @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: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol

/**
 * @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

/**
 * @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/token/ERC721/extensions/IERC721Enumerable.sol

/**
 * @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/utils/Address.sol

/**
 * @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;
        // solhint-disable-next-line no-inline-assembly
        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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/utils/Context.sol

/*
 * @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) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: @openzeppelin/contracts/utils/Strings.sol

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant alphabet = "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] = alphabet[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

}

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol

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

// File: @openzeppelin/contracts/token/ERC721/ERC721.sol

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

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Base URI for computing {tokenURI}. 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 || ERC721.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 || ERC721.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 {
                    // solhint-disable-next-line no-inline-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` 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 { }
}

// File: @openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol

/**
 * @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/utils/cryptography/ECDSA.sol

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        // Check the signature length
        if (signature.length != 65) {
            revert("ECDSA: invalid signature length");
        }

        // Divide the signature in r, s and v variables
        bytes32 r;
        bytes32 s;
        uint8 v;

        // ecrecover takes the signature parameters, and the only way to get them
        // currently is to use assembly.
        // solhint-disable-next-line no-inline-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);
    }

    /**
     * @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/proxy/Clones.sol

/**
 * @dev https://eips.ethereum.org/EIPS/eip-1167[EIP 1167] is a standard for
 * deploying minimal proxy contracts, also known as "clones".
 *
 * > To simply and cheaply clone contract functionality in an immutable way, this standard specifies
 * > a minimal bytecode implementation that delegates all calls to a known, fixed address.
 *
 * The library includes functions to deploy a proxy using either `create` (traditional deployment) or `create2`
 * (salted deterministic deployment). It also includes functions to predict the addresses of clones deployed using the
 * deterministic method.
 *
 * _Available since v3.4._
 */
library Clones {
    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create opcode, which should never revert.
     */
    function clone(address implementation) internal returns (address instance) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
            mstore(add(ptr, 0x14), shl(0x60, implementation))
            mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
            instance := create(0, ptr, 0x37)
        }
        require(instance != address(0), "ERC1167: create failed");
    }

    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create2 opcode and a `salt` to deterministically deploy
     * the clone. Using the same `implementation` and `salt` multiple time will revert, since
     * the clones cannot be deployed twice at the same address.
     */
    function cloneDeterministic(address implementation, bytes32 salt) internal returns (address instance) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
            mstore(add(ptr, 0x14), shl(0x60, implementation))
            mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
            instance := create2(0, ptr, 0x37, salt)
        }
        require(instance != address(0), "ERC1167: create2 failed");
    }

    /**
     * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
     */
    function predictDeterministicAddress(address implementation, bytes32 salt, address deployer) internal pure returns (address predicted) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
            mstore(add(ptr, 0x14), shl(0x60, implementation))
            mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf3ff00000000000000000000000000000000)
            mstore(add(ptr, 0x38), shl(0x60, deployer))
            mstore(add(ptr, 0x4c), salt)
            mstore(add(ptr, 0x6c), keccak256(ptr, 0x37))
            predicted := keccak256(add(ptr, 0x37), 0x55)
        }
    }

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

// File: contracts/ENSReverseRegistrarI.sol

/*
 * Interfaces for ENS Reverse Registrar
 * See https://github.com/ensdomains/ens/blob/master/contracts/ReverseRegistrar.sol for full impl
 * Also see https://github.com/wealdtech/wealdtech-solidity/blob/master/contracts/ens/ENSReverseRegister.sol
 *
 * Use this as follows (registryAddress is the address of the ENS registry to use):
 * -----
 * // This hex value is caclulated by namehash('addr.reverse')
 * bytes32 public constant ENS_ADDR_REVERSE_NODE = 0x91d1777781884d03a6757a803996e38de2a42967fb37eeaca72729271025a9e2;
 * function registerReverseENS(address registryAddress, string memory calldata) external {
 *     require(registryAddress != address(0), "need a valid registry");
 *     address reverseRegistrarAddress = ENSRegistryOwnerI(registryAddress).owner(ENS_ADDR_REVERSE_NODE)
 *     require(reverseRegistrarAddress != address(0), "need a valid reverse registrar");
 *     ENSReverseRegistrarI(reverseRegistrarAddress).setName(name);
 * }
 * -----
 * or
 * -----
 * function registerReverseENS(address reverseRegistrarAddress, string memory calldata) external {
 *    require(reverseRegistrarAddress != address(0), "need a valid reverse registrar");
 *     ENSReverseRegistrarI(reverseRegistrarAddress).setName(name);
 * }
 * -----
 * ENS deployments can be found at https://docs.ens.domains/ens-deployments
 * E.g. Etherscan can be used to look up that owner on those contracts.
 * namehash.hash("addr.reverse") == "0x91d1777781884d03a6757a803996e38de2a42967fb37eeaca72729271025a9e2"
 * Ropsten: ens.owner(namehash.hash("addr.reverse")) == "0x6F628b68b30Dc3c17f345c9dbBb1E483c2b7aE5c"
 * Mainnet: ens.owner(namehash.hash("addr.reverse")) == "0x084b1c3C81545d370f3634392De611CaaBFf8148"
 */

interface ENSRegistryOwnerI {
    function owner(bytes32 node) external view returns (address);
}

interface ENSReverseRegistrarI {
    event NameChanged(bytes32 indexed node, string name);
    /**
     * @dev Sets the `name()` record for the reverse ENS record associated with
     * the calling account.
     * @param name The name to set for this address.
     * @return The ENS node hash of the reverse record.
     */
    function setName(string calldata name) external returns (bytes32);
}

// File: contracts/ERC721SignedTransferI.sol

/*
 * Interface for ERC721 Signed Transfers.
 */

/**
 * @dev Outward-facing interface of a Collections contract.
 */
interface ERC721SignedTransferI is IERC721 {

    /**
     * @dev Emitted when a signed transfer is being executed.
     */
    event SignedTransfer(address operator, address indexed from, address indexed to, uint256 indexed tokenId, uint256 signedTransferNonce);

    /**
     * @dev The signed transfer nonce for an account.
     */
    function signedTransferNonce(address account) external view returns (uint256);

    /**
     * @dev Outward-facing function for signed transfer: assembles the expected data and then calls the internal function to do the rest.
     * Can called by anyone knowing about the right signature, but can only transfer to the given specific target.
     */
    function signedTransfer(uint256 tokenId, address to, bytes memory signature) external;

    /**
     * @dev Outward-facing function for operator-driven signed transfer: assembles the expected data and then calls the internal function to do the rest.
     * Can transfer to any target, but only be called by the trusted operator contained in the signature.
     */
    function signedTransferWithOperator(uint256 tokenId, address to, bytes memory signature) external;

}

// File: contracts/CollectionsI.sol

/*
 * Interface for the Collections factory.
 */

/**
 * @dev Outward-facing interface of a Collections contract.
 */
interface CollectionsI is IERC721 {

    /**
     * @dev Emitted when a new collection is created.
     */
    event NewCollection(address indexed owner, address collectionAddress);

    /**
     * @dev Emitted when a collection is destroyed.
     */
    event KilledCollection(address indexed owner, address collectionAddress);

    /**
     * @dev Creates a new Collection. For calling from other contracts,
     * returns the address of the new Collection.
     */
    function create(address _notificationContract,
                    string calldata _ensName,
                    string calldata _ensSubdomainName,
                    address _ensSubdomainRegistrarAddress,
                    address _ensReverseRegistrarAddress)
    external payable
    returns (address);

    /**
     * @dev Create a collection for a different owner. Only callable by a
     * create controller role. For calling from other contracts, returns the
     * address of the new Collection.
     */
    function createFor(address payable _newOwner,
                       address _notificationContract,
                       string calldata _ensName,
                       string calldata _ensSubdomainName,
                       address _ensSubdomainRegistrarAddress,
                       address _ensReverseRegistrarAddress)
    external payable
    returns (address);

    /**
     * @dev Removes (burns) an empty Collection. Only the Collection contract itself can call this.
     */
    function burn(uint256 tokenId) external;

    /**
     * @dev Returns if a Collection NFT exists for the specified `tokenId`.
     */
    function exists(uint256 tokenId) external view returns (bool);

    /**
     * @dev Returns whether the given spender can transfer a given `collectionAddr`.
     */
    function isApprovedOrOwnerOnCollection(address spender, address collectionAddr) external view returns (bool);

    /**
     * @dev Returns the Collection address for a token ID.
     */
    function collectionAddress(uint256 tokenId) external view returns (address);

    /**
     * @dev Returns the token ID for a Collection address.
     */
    function tokenIdForCollection(address collectionAddr) external view returns (uint256);

    /**
     * @dev Returns true if a Collection exists at this address, false if not.
     */
    function collectionExists(address collectionAddr) external view returns (bool);

    /**
     * @dev Returns the owner of the Collection with the given address.
     */
    function collectionOwner(address collectionAddr) external view returns (address);

    /**
     * @dev Returns a Collection address owned by `owner` at a given `index` of
     * its Collections list. Mirrors `tokenOfOwnerByIndex` in ERC721Enumerable.
     */
    function collectionOfOwnerByIndex(address owner, uint256 index) external view returns (address);

}

// File: @openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol

/**
 * _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {

    /**
        @dev Handles the receipt of a single ERC1155 token type. This function is
        called at the end of a `safeTransferFrom` after the balance has been updated.
        To accept the transfer, this must return
        `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
        (i.e. 0xf23a6e61, or its own function selector).
        @param operator The address which initiated the transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param id The ID of the token being transferred
        @param value The amount of tokens being transferred
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
    */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    )
        external
        returns(bytes4);

    /**
        @dev Handles the receipt of a multiple ERC1155 token types. This function
        is called at the end of a `safeBatchTransferFrom` after the balances have
        been updated. To accept the transfer(s), this must return
        `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
        (i.e. 0xbc197c81, or its own function selector).
        @param operator The address which initiated the batch transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param ids An array containing ids of each token being transferred (order and length must match values array)
        @param values An array containing amounts of each token being transferred (order and length must match ids array)
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
    */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    )
        external
        returns(bytes4);
}

// File: contracts/CollectionI.sol

/*
 * Interface for a single Collection, which is a very lightweight contract that can be the owner of ERC721 tokens.
 */

interface CollectionI is IERC165, IERC721Receiver, IERC1155Receiver  {

    /**
     * @dev Emitted when the notification conmtract is changed.
     */
    event NotificationContractTransferred(address indexed previousNotificationContract, address indexed newNotificationContract);

    /**
     * @dev Emitted when an asset is added to the collection.
     */
    event AssetAdded(address tokenAddress, uint256 tokenId);

    /**
     * @dev Emitted when an asset is removed to the collection.
     */
    event AssetRemoved(address tokenAddress, uint256 tokenId);

    /**
     * @dev Emitted when the Collection is destroyed.
     */
    event CollectionDestroyed(address operator);

    /**
     * @dev True is this is the prototype, false if this is an active
     * (clone/proxy) collection contract.
     */
    function isPrototype() external view returns (bool);

    /**
     * @dev The linked Collections factory (the ERC721 contract).
     */
    function collections() external view returns (CollectionsI);

    /**
     * @dev The linked notification contract (e.g. achievements).
     */
    function notificationContract() external view returns (address);

    /**
     * @dev Initializes a new Collection. Needs to be called by the Collections
     * factory.
     */
    function initialRegister(address _notificationContract,
                             string calldata _ensName,
                             string calldata _ensSubdomainName,
                             address _ensSubdomainRegistrarAddress,
                             address _ensReverseRegistrarAddress)
    external;

    /**
     * @dev Switch the notification contract to a different address. Set to the
     * zero address to disable notifications. Can only be called by owner.
     */
    function transferNotificationContract(address _newNotificationContract) external;

    /**
     * @dev Get collection owner from ERC 721 parent (Collections factory).
     */
    function ownerAddress() external view returns (address);

    /**
     * @dev Determine if the Collection owns a specific asset.
     */
    function ownsAsset(address _tokenAddress, uint256 _tokenId) external view returns(bool);

    /**
     * @dev Get count of owned assets.
     */
    function ownedAssetsCount() external view returns (uint256);

    /**
     * @dev Make sure ownership of a certain asset is recorded correctly (added
     * if the collection owns it or removed if it doesn't).
     */
    function syncAssetOwnership(address _tokenAddress, uint256 _tokenId) external;

    /**
     * @dev Transfer an owned asset to a new owner (for ERC1155, a single item
     * of that asset).
     */
    function safeTransferTo(address _tokenAddress, uint256 _tokenId, address _to) external;

    /**
     * @dev Transfer a certain amount of an owned asset to a new owner (for
     * ERC721, _value is ignored).
     */
    function safeTransferTo(address _tokenAddress, uint256 _tokenId, address _to, uint256 _value) external;

    /**
     * @dev Destroy and burn an empty Collection. Can only be called by owner
     * and only on empty collections.
     */
    function destroy() external;

    /**
     * @dev Forward calls to external contracts. Can only be called by owner.
     * Given a contract address and an already-encoded payload (with a function
     * call etc.), we call that contract with this payload, e.g. to trigger
     * actions in the name of the collection.
     */
    function externalCall(address payable _remoteAddress, bytes calldata _callPayload) external payable;

    /**
     * @dev Register ENS name. Can only be called by owner.
     */
    function registerENS(string calldata _name, address _registrarAddress) external;

    /**
     * @dev Register Reverse ENS name. Can only be called by owner.
     */
    function registerReverseENS(address _reverseRegistrarAddress, string calldata _name) external;
}

// File: contracts/MultiOracleRequestI.sol

/*
 * Interface for requests to the multi-rate oracle (for EUR/ETH and ERC20)
 * Copy this to projects that need to access the oracle.
 * This is a strict superset of OracleRequestI to ensure compatibility.
 * See rate-oracle project for implementation.
 */

interface MultiOracleRequestI {

    /**
     * @dev Number of wei per EUR
     */
    function EUR_WEI() external view returns (uint256); // solhint-disable func-name-mixedcase

    /**
     * @dev Timestamp of when the last update for the ETH rate occurred
     */
    function lastUpdate() external view returns (uint256);

    /**
     * @dev Number of EUR per ETH (rounded down!)
     */
    function ETH_EUR() external view returns (uint256); // solhint-disable func-name-mixedcase

    /**
     * @dev Number of EUR cent per ETH (rounded down!)
     */
    function ETH_EURCENT() external view returns (uint256); // solhint-disable func-name-mixedcase

    /**
     * @dev True for ERC20 tokens that are supported by this oracle, false otherwise
     */
    function tokenSupported(address tokenAddress) external view returns(bool);

    /**
     * @dev Number of token units per EUR
     */
    function eurRate(address tokenAddress) external view returns(uint256);

    /**
     * @dev Timestamp of when the last update for the specific ERC20 token rate occurred
     */
    function lastRateUpdate(address tokenAddress) external view returns (uint256);

    /**
     * @dev Emitted on rate update - using address(0) as tokenAddress for ETH updates
     */
    event RateUpdated(address indexed tokenAddress, uint256 indexed eurRate);

}

// File: contracts/BridgeDataI.sol

/*
 * Interface for data storage of the bridge.
 */

interface BridgeDataI {

    event AddressChanged(string name, address previousAddress, address newAddress);
    event ConnectedChainChanged(string previousConnectedChainName, string newConnectedChainName);
    event TokenURIBaseChanged(string previousTokenURIBase, string newTokenURIBase);
    event TokenSunsetAnnounced(uint256 indexed timestamp);

    /**
     * @dev The name of the chain connected to / on the other side of this bridge head.
     */
    function connectedChainName() external view returns (string memory);

    /**
     * @dev The name of our own chain, used in token URIs handed to deployed tokens.
     */
    function ownChainName() external view returns (string memory);

    /**
     * @dev The base of ALL token URIs, e.g. https://example.com/
     */
    function tokenURIBase() external view returns (string memory);

    /**
     * @dev The sunset timestamp for all deployed tokens.
     * If 0, no sunset is in place. Otherwise, if older than block timestamp,
     * all transfers of the tokens are frozen.
     */
    function tokenSunsetTimestamp() external view returns (uint256);

    /**
     * @dev Set a token sunset timestamp.
     */
    function setTokenSunsetTimestamp(uint256 _timestamp) external;

    /**
     * @dev Set an address for a name.
     */
    function setAddress(string memory name, address newAddress) external;

    /**
     * @dev Get an address for a name.
     */
    function getAddress(string memory name) external view returns (address);
}

// File: contracts/Collections.sol

/*
 * Implements Collections of ERC 721 tokens, exposed as yet another ERC721 token.
 */

contract Collections is ERC721Enumerable, CollectionsI, ERC721SignedTransferI {
    using Address for address payable;

    BridgeDataI public bridgeData;

    uint256 public priceEurCent;
    mapping(address => bool) public freeCreator;

    address public collectionPrototypeAddress;

    mapping(address => uint256) public override signedTransferNonce;

    event BridgeDataChanged(address indexed previousBridgeData, address indexed newBridgeData);
    event FreeCreatorSet(address indexed freeAddress, bool enabled);
    event PriceChanged(uint256 previousPriceEurCent, uint256 newPriceEurCent);
    // Collection event - never emitted in this contract but helpful for running our tests.
    event NotificationContractTransferred(address indexed previousNotificationContract, address indexed newNotificationContract);
    // TestTracker event - never emitted in this contract but helpful for running our tests.
    event SeenContractAdded(bool initial);

    constructor(address _bridgeDataAddress, uint256 _priceEurCent, address _collectionPrototypeAddress)
    ERC721("Crypto stamp Collections", "CSC")
    {
        bridgeData = BridgeDataI(_bridgeDataAddress);
        require(address(bridgeData) != address(0x0), "You need to provide an actual bridge data contract.");
        priceEurCent = _priceEurCent;
        require(priceEurCent > 0, "You need to provide a non-zero price.");
        require(CollectionI(_collectionPrototypeAddress).isPrototype(), "_collectionPrototypeAddress needs to be a prototype.");
        collectionPrototypeAddress = _collectionPrototypeAddress;
    }

    modifier onlyShopControl()
    {
        require(msg.sender == bridgeData.getAddress("shopControl"), "shopControl key required for this function.");
        _;
    }

    modifier onlyTokenAssignmentControl() {
        require(msg.sender == bridgeData.getAddress("tokenAssignmentControl"), "tokenAssignmentControl key required for this function.");
        _;
    }

    modifier requireTransferEnabled() {
        require(transferEnabled() == true, "This call only works when transfers are enabled.");
        _;
    }

    /*** Enable adjusting variables after deployment ***/

    function setBridgeData(BridgeDataI _newBridgeData)
    external
    onlyShopControl
    {
        require(address(_newBridgeData) != address(0x0), "You need to provide an actual bridge data contract.");
        emit BridgeDataChanged(address(bridgeData), address(_newBridgeData));
        bridgeData = _newBridgeData;
    }

    function setFreeCreators(address[] memory _freeAddresses, bool _enabled)
    public
    onlyShopControl
    {
        uint256 addrcount = _freeAddresses.length;
        for (uint256 i = 0; i < addrcount; i++) {
            freeCreator[_freeAddresses[i]] = _enabled;
            emit FreeCreatorSet(_freeAddresses[i], _enabled);
        }
    }

    function setPrice(uint256 _newPriceEurCent)
    public
    onlyShopControl
    {
        require(_newPriceEurCent > 0, "You need to provide a non-zero price.");
        emit PriceChanged(priceEurCent, _newPriceEurCent);
        priceEurCent = _newPriceEurCent;
    }

    // Calculate current asset price in "wei" (subunits of the native chain currency).
    // Note: Price in EUR cent is available from public var getter priceEurCent().
    function priceWei()
    public view
    returns (uint256)
    {
        return priceEurCent * MultiOracleRequestI(bridgeData.getAddress("Oracle")).eurRate(address(0)) / 100;
    }

    function baseURI() public view returns (string memory) {
        return _baseURI();
    }
    function _baseURI() internal view override returns (string memory) {
        return string(abi.encodePacked(bridgeData.tokenURIBase(), symbol(), "/meta/"));
    }

    // Return true if transfers are possible.
    // This can have additional conditions to just the sunset variable.
    function transferEnabled()
    public view
    returns (bool)
    {
        uint256 tokenSunsetTimestamp = bridgeData.tokenSunsetTimestamp();
        // solhint-disable-next-line not-rely-on-time
        return (tokenSunsetTimestamp == 0 || tokenSunsetTimestamp > block.timestamp);
    }

    /*** Override internal functionality for special rules on approvals and transfers ***/

    // When the bridge is sunset, all token actions will be blocked.
    function _beforeTokenTransfer(address _from, address _to, uint256 _tokenId)
    internal override
    requireTransferEnabled
    {
        super._beforeTokenTransfer(_from, _to, _tokenId);
    }

    /*** Manage collections ***/

    // Issue a new collection, which will be owned by whoever calls this function.
    function create(address _notificationContract,
                    string memory _ensName,
                    string memory _ensSubdomainName,
                    address _ensSubdomainRegistrarAddress,
                    address _ensReverseRegistrarAddress)
    public override payable
    returns (address)
    {
        return createFor(payable(msg.sender), _notificationContract, _ensName, _ensSubdomainName, _ensSubdomainRegistrarAddress, _ensReverseRegistrarAddress);
    }

    // Create a collection for a different owner.
    function createFor(address payable _newOwner,
                       address _notificationContract,
                       string memory _ensName,
                       string memory _ensSubdomainName,
                       address _ensSubdomainRegistrarAddress,
                       address _ensReverseRegistrarAddress)
    public override payable
    returns (address)
    {
        uint256 curPriceWei = priceWei();
        if (freeCreator[msg.sender] || msg.sender == bridgeData.getAddress("tokenHolder")) {
            // The bridge and create control do not need to pay for creating collections.
            curPriceWei = 0;
        }
        require(msg.value >= curPriceWei, "You need to send money to create a collection.");
        address newCollectionAddress = _createCollection(_newOwner, _notificationContract, _ensName, _ensSubdomainName, _ensSubdomainRegistrarAddress, _ensReverseRegistrarAddress);
        // Transfer the actual payment amount to the beneficiary.
        // Our own account so no reentrancy here but put at end to be sure.
        payable(bridgeData.getAddress("beneficiary")).sendValue(curPriceWei);
        // Send back change money. Do this last.
        if (msg.value > curPriceWei) {
            _newOwner.sendValue(msg.value - curPriceWei);
        }
        return newCollectionAddress;
    }

    function _createCollection(address _newOwner,
                               address _notificationContract,
                               string memory _ensName,
                               string memory _ensSubdomainName,
                               address _ensSubdomainRegistrarAddress,
                               address _ensReverseRegistrarAddress)
    internal
    returns (address)
    {
        require(collectionPrototypeAddress != address(0), "Set a collection prototype first!");
        address newCollectionAddress;
        if (bytes(_ensName).length > 0) {
            // If we have a name, clone with predictable address based on it,
            // and use the same strategy as for an ENS "label" to generate the salt for cloning.
            bytes32 cloneSalt = keccak256(bytes(_ensName));
            newCollectionAddress = Clones.cloneDeterministic(collectionPrototypeAddress, cloneSalt);
        }
        else {
            // If a Collection may be created without name, use "classic" cloning.
            newCollectionAddress = Clones.clone(collectionPrototypeAddress);
        }
        emit NewCollection(_newOwner, newCollectionAddress);
        // _safeMint() checks if the recipient can actually receive ERC721 tokens.
        _safeMint(_newOwner, addr2id(newCollectionAddress));
        // Now, register notification and ENS.
        CollectionI(newCollectionAddress).initialRegister(_notificationContract, _ensName, _ensSubdomainName, _ensSubdomainRegistrarAddress, _ensReverseRegistrarAddress);
        return newCollectionAddress;
    }

    // Removes (burns) an empty Collection.
    function burn(uint256 tokenId)
    public override
    {
        address payable collAddress = payable(id2addr(tokenId));
        require(msg.sender == collAddress, "Only the collection itself can burn the token.");
        // The contract itself checks this, but let's check again to be really sure.
        require(CollectionI(collAddress).ownedAssetsCount() == 0, "Only empty collections can be burned.");
        address owner = ownerOf(tokenId);
        _burn(tokenId);
        emit KilledCollection(owner, collAddress);
    }

    // Returns whether the specified token exists
    function exists(uint256 tokenId)
    public view override
    returns (bool)
    {
        return _exists(tokenId);
    }

    // Returns whether the given spender can transfer a given token ID.
    function isApprovedOrOwnerOnCollection(address spender, address collectionAddr)
    public view override
    returns (bool)
    {
        return _isApprovedOrOwner(spender, addr2id(collectionAddr));
    }

    /*** Convert token IDs to Collection addresses and the other way round ***/

    // Returns the Collection address for a token ID.
    function collectionAddress(uint256 tokenId)
    public view override
    returns (address)
    {
        require(_exists(tokenId), "Collection needs to exist.");
        return id2addr(tokenId);
    }

    // Returns the token ID for a Collection address.
    function tokenIdForCollection(address collectionAddr)
    public view override
    returns (uint256)
    {
        uint256 tokenId = addr2id(collectionAddr);
        require(_exists(tokenId), "Collection needs to exist.");
        return tokenId;
    }

    function id2addr(uint256 tokenId)
    internal pure
    returns (address)
    {
        return address(uint160(tokenId));
    }

    function addr2id(address collectionAddr)
    internal pure
    returns (uint256)
    {
        return uint256(uint160(collectionAddr));
    }

    /*** Functions that mirror ERC721 but use addresses instead ***/

    // Returns whether the specified token exists
    function collectionExists(address collectionAddr)
    public view override
    returns (bool)
    {
        return _exists(addr2id(collectionAddr));
    }

    function collectionOwner(address collectionAddr)
    public view override
    returns (address)
    {
        return ownerOf(addr2id(collectionAddr));
    }

    function collectionOfOwnerByIndex(address owner, uint256 index)
    public view override
    returns (address)
    {
        return id2addr(tokenOfOwnerByIndex(owner, index));
    }

    /*** Allows any user to initiate a transfer with the signature of the current collection owner  ***/

    // Outward-facing function for signed transfer: assembles the expected data and then calls the internal function to do the rest.
    // Can called by anyone knowing about the right signature, but can only transfer to the given specific target.
    function signedTransfer(uint256 _tokenId, address _to, bytes memory _signature)
    public override
    requireTransferEnabled
    {
        address currentOwner = ownerOf(_tokenId);
        // The signed data contains the token ID, the transfer target and a nonce.
        bytes32 data = keccak256(abi.encodePacked(address(this), this.signedTransfer.selector, currentOwner, _to, _tokenId, signedTransferNonce[currentOwner]));
        _signedTransferInternal(currentOwner, data, _tokenId, _to, _signature);
    }

    // Outward-facing function for operator-driven signed transfer: assembles the expected data and then calls the internal function to do the rest.
    // Can transfer to any target, but only be called by the trusted operator contained in the signature.
    function signedTransferWithOperator(uint256 _tokenId, address _to, bytes memory _signature)
    public override
    requireTransferEnabled
    {
        address currentOwner = ownerOf(_tokenId);
        // The signed data contains the operator, the token ID, and a nonce. Note that we use the selector of the external function here!
        bytes32 data = keccak256(abi.encodePacked(address(this), this.signedTransferWithOperator.selector, msg.sender, currentOwner, _tokenId, signedTransferNonce[currentOwner]));
        _signedTransferInternal(currentOwner, data, _tokenId, _to, _signature);
    }

    // Actually check the signature and perform a signed transfer.
    function _signedTransferInternal(address _currentOwner, bytes32 _data, uint256 _tokenId, address _to, bytes memory _signature)
    internal
    {
        bytes32 hash = ECDSA.toEthSignedMessageHash(_data);
        address signer = ECDSA.recover(hash, _signature);
        require(signer == _currentOwner, "Signature needs to match parameters, nonce, and current owner.");
        // Now that we checked that the signature is correct, do the actual transfer and increase the nonce.
        emit SignedTransfer(msg.sender, _currentOwner, _to, _tokenId, signedTransferNonce[_currentOwner]);
        signedTransferNonce[_currentOwner]++;
        _safeTransfer(_currentOwner, _to, _tokenId, "");
    }

    /*** Enable reverse ENS registration ***/

    // Call this with the address of the reverse registrar for the respecitve network and the ENS name to register.
    // The reverse registrar can be found as the owner of 'addr.reverse' in the ENS system.
    // See https://docs.ens.domains/ens-deployments for address of ENS deployments, e.g. Etherscan can be used to look up that owner on those.
    // namehash.hash("addr.reverse") == "0x91d1777781884d03a6757a803996e38de2a42967fb37eeaca72729271025a9e2"
    // Ropsten: ens.owner(namehash.hash("addr.reverse")) == "0x6F628b68b30Dc3c17f345c9dbBb1E483c2b7aE5c"
    // Mainnet: ens.owner(namehash.hash("addr.reverse")) == "0x084b1c3C81545d370f3634392De611CaaBFf8148"
    function registerReverseENS(address _reverseRegistrarAddress, string calldata _name)
    external
    onlyTokenAssignmentControl
    {
       require(_reverseRegistrarAddress != address(0), "need a valid reverse registrar");
       ENSReverseRegistrarI(_reverseRegistrarAddress).setName(_name);
    }

    /*** Make sure currency doesn't get stranded in this contract ***/

    // If this contract gets a balance in some ERC20 contract after it's finished, then we can rescue it.
    function rescueToken(IERC20 _foreignToken, address _to)
    external
    onlyTokenAssignmentControl
    {
        _foreignToken.transfer(_to, _foreignToken.balanceOf(address(this)));
    }

    // If this contract gets a balance in some ERC721 contract after it's finished, then we can rescue it.
    function approveNFTrescue(IERC721 _foreignNFT, address _to)
    external
    onlyTokenAssignmentControl
    {
        _foreignNFT.setApprovalForAll(_to, true);
    }

}

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0000000000000000000000000884fc15e31b1b634732e140cb3f94b3cbfdd1c50000000000000000000000000000000000000000000000000000000000000064000000000000000000000000a86949e286bf3c2ffd2327b2ffc5a12b63c1ccb9

-----Decoded View---------------
Arg [0] : _bridgeDataAddress (address): 0x0884fc15E31B1B634732e140cb3F94b3cbFdD1c5
Arg [1] : _priceEurCent (uint256): 100
Arg [2] : _collectionPrototypeAddress (address): 0xa86949e286BF3c2FFD2327b2ffC5A12B63c1CcB9

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000000884fc15e31b1b634732e140cb3f94b3cbfdd1c5
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000064
Arg [2] : 000000000000000000000000a86949e286bf3c2ffd2327b2ffc5a12b63c1ccb9