Contract 0x3151b7dd9f6e806d2709153765925c373af47089 2

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

/*
 * Crypto stamp 3.1 (Layer 2)
 * digital-physical collectible postage stamp
 *
 * 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/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 {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

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

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

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

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

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

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

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

        return (signer, RecoverError.NoError);
    }

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

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

    /**
     * @dev Returns an Ethereum Signed 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/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/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;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// File: @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) {
        return msg.data;
    }
}

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

/**
 * @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

/**
 * @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}. 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.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

/**
 * @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: contracts/ERC721EnumerableSimple.sol

/*
 * This is a simplified (and cheaper) version of OpenZeppelin's ERC721Enumerable.
 * ERC721Enumerable's allTokens array and allTokensIndex mapping are eliminated.
 * Side effects: _burn cannot be used any more with this, and creation needs to be
 * in ascending order, starting with 0, and have no holes in the sequence of IDs.
 */

/**
 * @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 ERC721EnumerableSimple 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;

    uint256 internal totalSupply_;

    /**
     * @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 totalSupply_;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < totalSupply(), "Index is out of bounds.");
        return 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 {
        totalSupply_++;
    }

    /**
     * @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 is not possible with this variant.
     * param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 /*tokenId*/) private pure {
        revert("This token cannot be burned.");
    }
}

// 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/ERC721ExistsI.sol

/*
 * Interface for an ERC721 compliant contract with an exists() function.
 */

/**
 * @dev ERC721 compliant contract with an exists() function.
 */
interface ERC721ExistsI is IERC721 {

    // Returns whether the specified token exists
    function exists(uint256 tokenId) external view returns (bool);

}

// 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/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/CS3_1PropertiesI.sol

/*
 * Interface for CS3.1 properties.
 */

interface CS3_1PropertiesI {

    enum AssetType {
        Rhino,
        Kitty
    }

    enum SColors {
        Sleeping,
        Black,
        Green,
        Blue,
        Yellow,
        Red
    }

    function getType(uint256 tokenId) external view returns (AssetType);
    function getSColor(uint256 tokenId) external view returns (SColors);

}

// File: contracts/Cryptostamp3_1L2.sol

/*
 * Implements ERC 721 NFT standard: https://github.com/ethereum/EIPs/issues/721.
 */

contract Cryptostamp3_1L2 is ERC721EnumerableSimple, ERC721ExistsI, ERC721SignedTransferI, CS3_1PropertiesI {

    BridgeDataI public bridgeData;

    uint256 immutable finalSupply;
    uint256 immutable type1Supply;
    uint256 immutable type2Supply;
    uint256 constant maxSupportedSupply = 2 ** 24;
    uint8[maxSupportedSupply] private properties;
    mapping(uint256 => uint256) public colorRevealBlock;
    uint256[] public revealList;
    uint256 public revealFinishedCount;
    uint256[5][2] public unrevealedColorCount;
    bool public transferCanFinishPendingReveal;

    uint256 public upgradesDone = 0;
    uint256 public upgradeMaximum;
    uint256[5][2] public colorSupply;
    mapping(uint256 => bool) public usedInUpgrade;

    mapping(address => uint256) public override signedTransferNonce;

    event BridgeDataChanged(address indexed previousBridgeData, address indexed newBridgeData);
    event UpgradeMaximumChanged(uint256 previousUpgradeMaximum, uint256 newUpgradeMaximum);
    event TransferCanFinishPendingRevealSet(bool newTransferCanFinishPendingReveal);
    event ColorRevealStarted(uint256 indexed tokenId);
    event ColorRevealed(uint256 indexed tokenId, SColors indexed newColor);
    event StampUpgraded(uint256 indexed changedTokenId, SColors previousColor, SColors newColor, uint256 usedTokedId1, uint256 usedTokenId2);

    constructor(address _bridgeDataAddress, uint256 _finalSupply, uint256[2] memory _typeSupplies, uint256[5][2] memory _totalColorSupply)
    ERC721("Crypto stamp Edition 3.1", "CS3.1")
    {
        bridgeData = BridgeDataI(_bridgeDataAddress);
        require(address(bridgeData) != address(0x0), "You need to provide an actual bridge data contract.");
        require(_finalSupply <= maxSupportedSupply, "The final supply is too high.");
        finalSupply = _finalSupply;
        require(_finalSupply == _typeSupplies[0] + _typeSupplies[1], "Final supply needs to match the type supplies.");
        type1Supply = _typeSupplies[0];
        type2Supply = _typeSupplies[1];
        for (uint256 i = 0; i < 2; i++) {
            require(_totalColorSupply[i][0] + _totalColorSupply[i][1] + _totalColorSupply[i][2] + _totalColorSupply[i][3] + _totalColorSupply[i][4] == _typeSupplies[i],
                    "The total color supplies need to match the type supplies.");
        }
        colorSupply = _totalColorSupply;
        unrevealedColorCount = _totalColorSupply;
        transferCanFinishPendingReveal = true;
    }

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

    modifier onlyBridgeControl() {
        require(msg.sender == bridgeData.getAddress("bridgeControl"), "bridgeControl 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.");
        _;
    }

    modifier requireMinting() {
        require(mintingFinished() == false, "This call only works when minting is not finished.");
        _;
    }

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

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

    function setTransferCanFinishPendingReveal(bool _newTransferCanFinishPendingReveal)
    external
    onlyBridgeControl
    {
        transferCanFinishPendingReveal = _newTransferCanFinishPendingReveal;
        emit TransferCanFinishPendingRevealSet(transferCanFinishPendingReveal);
    }

    function setUpgradeMaximum(uint256 _newUpgradeMaximum)
    public
    onlyBridgeControl
    {
        require(upgradesDone <= _newUpgradeMaximum, "Already more upgrades done than the requested limit.");
        emit UpgradeMaximumChanged(upgradeMaximum, _newUpgradeMaximum);
        upgradeMaximum = _newUpgradeMaximum;
    }

    // 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);
    }

    /*** Base functionality: minting, URI, property getters, etc. ***/

    /**
     * @dev Gets the actually minted amount of tokens in the contract.
     * @return uint256 representing the minted amount of tokens
     */
    function mintedSupply()
    public view
    returns (uint256)
    {
        return super.totalSupply();
    }

    // Issue a new crypto stamp asset, giving it to a specific owner address.
    function create(uint256 _tokenId, address _owner)
    public
    onlyCreateControl
    requireMinting
    {
        // _mint already ends up checking if owner != 0 and that tokenId doesn't exist yet.
        _mint(_owner, _tokenId);
    }

    // Batch-issue multiple crypto stamps with adjacent IDs.
    function createMulti(uint256 _tokenIdStart, address[] memory _owners)
    public
    onlyCreateControl
    requireMinting
    {
        uint256 addrcount = _owners.length;
        for (uint256 i = 0; i < addrcount; i++) {
            // Make sure this is in sync with what create() does.
            _mint(_owners[i], _tokenIdStart + i);
        }
    }

    // Determine if the creation/minting process is done.
    function mintingFinished()
    public view
    returns (bool)
    {
        return (super.totalSupply() >= finalSupply);
    }

    // Get type of the given token.
    function getType(uint256 _tokenId)
    public view override
    returns (AssetType)
    {
        require(_exists(_tokenId), "Token ID needs to exist.");
        if (_tokenId < type1Supply) {
            return AssetType.Rhino;
        }
        return AssetType.Kitty;
    }

    // Get sleeping or color of the given token.
    function getSColor(uint256 _tokenId)
    public view override
    returns (SColors)
    {
        require(_exists(_tokenId), "Token ID needs to exist.");
        return SColors(properties[_tokenId]);
    }

    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/"));
    }

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

    /*** Color reveal functionality: "sleeping" stamps get a random actual color via a two-step process ***/

    // Start color reveal of of the given token.
    function startColorReveal(uint256 _tokenId, bool _finishOnePending)
    public
    {
        require(msg.sender == bridgeData.getAddress("colorRevealAPI") || msg.sender == ownerOf(_tokenId), "You cannot start color reveal for this token.");
        require(SColors(properties[_tokenId]) == SColors.Sleeping, "Color needs to be unrevealed.");
        require(colorRevealBlock[_tokenId] == 0, "Color reveal already started.");
        _startColorReveal(_tokenId, _finishOnePending);
    }

    // Start color reveal of of the given token.
    function _startColorReveal(uint256 _tokenId, bool _finishOnePending)
    internal
    {
        colorRevealBlock[_tokenId] = block.number;
        revealList.push(_tokenId);
        emit ColorRevealStarted(_tokenId);
        if (_finishOnePending) {
            _finishNextColorReveal(false);
        }
    }

    // Finish color reveal of potentially multiple tokens, doing fewer if fewer are in process.
    function finishColorReveals(uint256 _maxCount)
    public
    {
        for (uint256 i = 0; i < _maxCount; i++) {
            _finishNextColorReveal(false);
        }
    }

    // Finish color reveal of the next token in the list.
    function finishNextColorReveal()
    public
    {
        _finishNextColorReveal(true);
    }

    // Finish color reveal of the next token in the list.
    function _finishNextColorReveal(bool _revertForFailures)
    internal
    {
        if (revealPendingCount() == 0) {
            if (_revertForFailures) {
                revert("No pending color reveals.");
            }
            return; // We could revert here but we do not want to fail when called by other contract functions.
        }
        uint256 tokenId = revealList[revealFinishedCount]; // The list index of the next reveal to finish equals the number of already finished reveals.
        if (colorRevealBlock[tokenId] == block.number || colorRevealBlock[tokenId] == 0 || SColors(properties[tokenId]) != SColors.Sleeping) {
            if (_revertForFailures) {
                revert("Cannot reveal this token.");
            }
            return; // We could revert here but we do not want to fail when called by other contract functions.
        }
        uint256 aTypeNum = uint256(getType(tokenId));
        uint256 allUnrevealedCount = unrevealedColorCount[aTypeNum][0] + unrevealedColorCount[aTypeNum][1] + unrevealedColorCount[aTypeNum][2] + unrevealedColorCount[aTypeNum][3] + unrevealedColorCount[aTypeNum][4];
        uint256 colorIndex = _getSemiRandomNumber(colorRevealBlock[tokenId], tokenId, allUnrevealedCount);
        SColors newColor;
        if (colorIndex < unrevealedColorCount[aTypeNum][0]) {
            newColor = SColors.Black;
        }
        else if (colorIndex < unrevealedColorCount[aTypeNum][0] + unrevealedColorCount[aTypeNum][1]) {
            newColor = SColors.Green;
        }
        else if (colorIndex < unrevealedColorCount[aTypeNum][0] + unrevealedColorCount[aTypeNum][1] + unrevealedColorCount[aTypeNum][2]) {
            newColor = SColors.Blue;
        }
        else if (colorIndex < unrevealedColorCount[aTypeNum][0] + unrevealedColorCount[aTypeNum][1] + unrevealedColorCount[aTypeNum][2] + unrevealedColorCount[aTypeNum][3]) {
            newColor = SColors.Yellow;
        }
        else {
            newColor = SColors.Red;
        }
        colorRevealBlock[tokenId] = 0; // Set to 0 again for state hygiene.
        properties[tokenId] = uint8(newColor);
        unrevealedColorCount[aTypeNum][uint8(newColor) - 1] = unrevealedColorCount[aTypeNum][uint8(newColor) - 1] - 1;
        emit ColorRevealed(tokenId, newColor);
        revealFinishedCount = revealFinishedCount + 1;
    }

    // Get a semi-random number based on the block has of the given block number, a salt and an exclusive max value.
    function _getSemiRandomNumber(uint256 _blockNumber, uint256 _salt, uint256 _maxValueExclusive)
    internal view
    returns (uint256)
    {
        // Get block hash. As this only works for the last 256 blocks, fall back to the empty keccak256 hash to keep getting stable results.
        bytes32 bhash;
        if (_blockNumber == block.number) {
          revert("Wait for next block please.");
        }
        else if (block.number < 256 || _blockNumber >= block.number - 256) {
          bhash = blockhash(_blockNumber);
        }
        else {
          bhash = keccak256("");
        }
        return uint256(keccak256(abi.encodePacked(_salt, bhash))) % _maxValueExclusive;
    }

    // Indicate if a color reveal is pending for the given token.
    function colorRevealPending(uint256 _tokenId)
    public view
    returns (bool)
    {
        // User getSColor() so this reverts on non-existing tokens.
        return getSColor(_tokenId) == SColors.Sleeping && colorRevealBlock[_tokenId] > 0;
    }

    // Get number of started reveal processes.
    function revealStartedCount()
    public view
    returns (uint256)
    {
        return revealList.length;
    }

    // Get number of pendiung reveal processes.
    function revealPendingCount()
    public view
    returns (uint256)
    {
        return revealList.length - revealFinishedCount;
    }

    /*** Upgrading functionality: upgrade color of the stamp using other stamps of the same color ***/

    // Returns whether upgrading is possible at this time.
    function upgradesAllowed() public view returns (bool) {
        return upgradesDone < upgradeMaximum;
    }

    // Upgrade 1 CS3 stamp by "upgrading" with 2 other CS3 of same type and color.
    function upgradeStamp(uint256 _upgradeTokenId, uint256 _helperTokenId1, uint256 _helperTokenId2)
    public
    {
        require(upgradesDone < upgradeMaximum, "Maximum upgrades reached");
        require(_upgradeTokenId != _helperTokenId1 &&
                _upgradeTokenId != _helperTokenId2 &&
                _helperTokenId1 != _helperTokenId2,
                "You actually need to use 3 different tokens to upgrade");
        require(msg.sender == ownerOf(_upgradeTokenId) &&
                msg.sender == ownerOf(_helperTokenId1) &&
                msg.sender == ownerOf(_helperTokenId2),
                "Caller has to be owner of all tokens.");
        require(usedInUpgrade[_upgradeTokenId] == false &&
                usedInUpgrade[_helperTokenId1] == false &&
                usedInUpgrade[_helperTokenId2] == false,
                "Cannot used stamps already used in a upgrade.");
        SColors previousColor = getSColor(_upgradeTokenId);
        require(previousColor != SColors.Sleeping, "Sleeping stamps cannot be upgraded.");
        AssetType aType = getType(_upgradeTokenId);
        require(getType(_helperTokenId1) == aType && getSColor(_helperTokenId1) == previousColor &&
                getType(_helperTokenId2) == aType && getSColor(_helperTokenId2) == previousColor,
                "All tokens involved must have the same type and color");
        usedInUpgrade[_helperTokenId1] = true;
        usedInUpgrade[_helperTokenId2] = true;
        // Now, actually upgrade the color and notify the achievements contract.
        SColors newColor = _upgradeColor(_upgradeTokenId, previousColor);
        emit StampUpgraded(_upgradeTokenId, previousColor, newColor, _helperTokenId1, _helperTokenId2);
    }

    function _upgradeColor(uint256 _upgradeTokenId, SColors _previousColor)
    private
    returns(SColors)
    {
        SColors newColor = SColors(uint256(_previousColor) + 1);
        properties[_upgradeTokenId] = uint8(newColor);
        uint256 aTypeNum = uint256(getType(_upgradeTokenId));
        colorSupply[aTypeNum][uint256(_previousColor) - 1] = colorSupply[aTypeNum][uint256(_previousColor) - 1] - 1;
        colorSupply[aTypeNum][uint256(newColor) - 1] = colorSupply[aTypeNum][uint256(newColor) - 1] + 1;
        upgradesDone++;
        return newColor;
    }

    /*** 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
    {
        if (_to == bridgeData.getAddress("tokenHolder") && SColors(properties[_tokenId]) == SColors.Sleeping) {
            revert("Reveal color before depositing!");
        }
        if (_from != address(0) && SColors(properties[_tokenId]) == SColors.Sleeping && colorRevealBlock[_tokenId] == 0) {
            _startColorReveal(_tokenId, transferCanFinishPendingReveal);
        }
        super._beforeTokenTransfer(_from, _to, _tokenId);
    }

    // Override totalSupply() so it reports the target final supply.
    function totalSupply()
    public view override
    returns (uint256)
    {
        return finalSupply;
    }

    /*** Allows any user to initiate a transfer with the signature of the current stamp 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 respective network and the ENS name to register.
    // The reverse registrar can be found as the owner of 'addr.reverse' in the ENS system.
    // For Mainnet, the address needed is 0x9062c0a6dbd6108336bcbe4593a3d1ce05512069
    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 or NFT 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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CS3_1PropertiesI.SColors","name":"newColor","type":"uint8"}],"name":"ColorRevealed","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"operator","type":"address"},{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"signedTransferNonce","type":"uint256"}],"name":"SignedTransfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"changedTokenId","type":"uint256"},{"indexed":false,"internalType":"enum CS3_1PropertiesI.SColors","name":"previousColor","type":"uint8"},{"indexed":false,"internalType":"enum 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-----Encoded View---------------
14 Constructor Arguments found :
Arg [0] : 0000000000000000000000000884fc15e31b1b634732e140cb3f94b3cbfdd1c5
Arg [1] : 00000000000000000000000000000000000000000000000000000000000222e0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000011170
Arg [3] : 0000000000000000000000000000000000000000000000000000000000011170
Arg [4] : 0000000000000000000000000000000000000000000000000000000000008f19
Arg [5] : 00000000000000000000000000000000000000000000000000000000000048eb
Arg [6] : 0000000000000000000000000000000000000000000000000000000000002475
Arg [7] : 000000000000000000000000000000000000000000000000000000000000123b
Arg [8] : 00000000000000000000000000000000000000000000000000000000000002bc
Arg [9] : 0000000000000000000000000000000000000000000000000000000000008f19
Arg [10] : 00000000000000000000000000000000000000000000000000000000000048eb
Arg [11] : 0000000000000000000000000000000000000000000000000000000000002475
Arg [12] : 000000000000000000000000000000000000000000000000000000000000123b
Arg [13] : 00000000000000000000000000000000000000000000000000000000000002bc