Contract 0xbccaa7acb552a2c7eb27c7eb77c2cc99580735b9 2

/**
 *Submitted for verification at polygonscan.com on 2021-06-30
*/

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN 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 payable) {
		return msg.sender;
	}

	function _msgData() internal view virtual returns (bytes memory) {
		this;
		// silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
		return msg.data;
	}
}

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;


/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
	/**
	 * @dev Emitted when `tokenId` token is transfered 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/IERC721Metadata.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;


/**
 * @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/IERC721Enumerable.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;


/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {

	/**
	 * @dev Returns the total amount of tokens stored by the contract.
	 */
	function totalSupply() external view returns (uint256);

	/**
	 * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
	 * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
	 */
	function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

	/**
	 * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
	 * Use along with {totalSupply} to enumerate all tokens.
	 */
	function tokenByIndex(uint256 index) external view returns (uint256);
}

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;


/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
contract ERC165 is IERC165 {
	/*
	 * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
	 */
	bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

	/**
	 * @dev Mapping of interface ids to whether or not it's supported.
	 */
	mapping(bytes4 => bool) private _supportedInterfaces;

	constructor () internal {
		// Derived contracts need only register support for their own interfaces,
		// we register support for ERC165 itself here
		_registerInterface(_INTERFACE_ID_ERC165);
	}

	/**
	 * @dev See {IERC165-supportsInterface}.
	 *
	 * Time complexity O(1), guaranteed to always use less than 30 000 gas.
	 */
	function supportsInterface(bytes4 interfaceId) public view override returns (bool) {
		return _supportedInterfaces[interfaceId];
	}

	/**
	 * @dev Registers the contract as an implementer of the interface defined by
	 * `interfaceId`. Support of the actual ERC165 interface is automatic and
	 * registering its interface id is not required.
	 *
	 * See {IERC165-supportsInterface}.
	 *
	 * Requirements:
	 *
	 * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
	 */
	function _registerInterface(bytes4 interfaceId) internal virtual {
		require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
		_supportedInterfaces[interfaceId] = true;
	}
}

// File: @openzeppelin/contracts/math/SafeMath.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
	/**
	 * @dev Returns the addition of two unsigned integers, reverting on
	 * overflow.
	 *
	 * Counterpart to Solidity's `+` operator.
	 *
	 * Requirements:
	 *
	 * - Addition cannot overflow.
	 */
	function add(uint256 a, uint256 b) internal pure returns (uint256) {
		uint256 c = a + b;
		require(c >= a, "SafeMath: addition overflow");

		return c;
	}

	/**
	 * @dev Returns the subtraction of two unsigned integers, reverting on
	 * overflow (when the result is negative).
	 *
	 * Counterpart to Solidity's `-` operator.
	 *
	 * Requirements:
	 *
	 * - Subtraction cannot overflow.
	 */
	function sub(uint256 a, uint256 b) internal pure returns (uint256) {
		return sub(a, b, "SafeMath: subtraction overflow");
	}

	/**
	 * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
	 * overflow (when the result is negative).
	 *
	 * Counterpart to Solidity's `-` operator.
	 *
	 * Requirements:
	 *
	 * - Subtraction cannot overflow.
	 */
	function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
		require(b <= a, errorMessage);
		uint256 c = a - b;

		return c;
	}

	/**
	 * @dev Returns the multiplication of two unsigned integers, reverting on
	 * overflow.
	 *
	 * Counterpart to Solidity's `*` operator.
	 *
	 * Requirements:
	 *
	 * - Multiplication cannot overflow.
	 */
	function mul(uint256 a, uint256 b) internal pure returns (uint256) {
		// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
		// benefit is lost if 'b' is also tested.
		// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
		if (a == 0) {
			return 0;
		}

		uint256 c = a * b;
		require(c / a == b, "SafeMath: multiplication overflow");

		return c;
	}

	/**
	 * @dev Returns the integer division of two unsigned integers. Reverts on
	 * division by zero. The result is rounded towards zero.
	 *
	 * Counterpart to Solidity's `/` operator. Note: this function uses a
	 * `revert` opcode (which leaves remaining gas untouched) while Solidity
	 * uses an invalid opcode to revert (consuming all remaining gas).
	 *
	 * Requirements:
	 *
	 * - The divisor cannot be zero.
	 */
	function div(uint256 a, uint256 b) internal pure returns (uint256) {
		return div(a, b, "SafeMath: division by zero");
	}

	/**
	 * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
	 * division by zero. The result is rounded towards zero.
	 *
	 * Counterpart to Solidity's `/` operator. Note: this function uses a
	 * `revert` opcode (which leaves remaining gas untouched) while Solidity
	 * uses an invalid opcode to revert (consuming all remaining gas).
	 *
	 * Requirements:
	 *
	 * - The divisor cannot be zero.
	 */
	function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
		require(b > 0, errorMessage);
		uint256 c = a / b;
		// assert(a == b * c + a % b); // There is no case in which this doesn't hold

		return c;
	}

	/**
	 * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
	 * Reverts when dividing by zero.
	 *
	 * Counterpart to Solidity's `%` operator. This function uses a `revert`
	 * opcode (which leaves remaining gas untouched) while Solidity uses an
	 * invalid opcode to revert (consuming all remaining gas).
	 *
	 * Requirements:
	 *
	 * - The divisor cannot be zero.
	 */
	function mod(uint256 a, uint256 b) internal pure returns (uint256) {
		return mod(a, b, "SafeMath: modulo by zero");
	}

	/**
	 * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
	 * Reverts with custom message when dividing by zero.
	 *
	 * Counterpart to Solidity's `%` operator. This function uses a `revert`
	 * opcode (which leaves remaining gas untouched) while Solidity uses an
	 * invalid opcode to revert (consuming all remaining gas).
	 *
	 * Requirements:
	 *
	 * - The divisor cannot be zero.
	 */
	function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
		require(b != 0, errorMessage);
		return a % b;
	}
}

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

/**
 * @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) {
		// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
		// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
		// for accounts without code, i.e. `keccak256('')`
		bytes32 codehash;
		bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
		// solhint-disable-next-line no-inline-assembly
		assembly {codehash := extcodehash(account)}
		return (codehash != accountHash && codehash != 0x0);
	}

	/**
	 * @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");
		return _functionCallWithValue(target, data, value, errorMessage);
	}

	function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
		require(isContract(target), "Address: call to non-contract");

		// solhint-disable-next-line avoid-low-level-calls
		(bool success, bytes memory returndata) = target.call{value : weiValue}(data);
		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/EnumerableSet.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`
 * (`UintSet`) are supported.
 */
library EnumerableSet {
	// To implement this library for multiple types with as little code
	// repetition as possible, we write it in terms of a generic Set type with
	// bytes32 values.
	// The Set implementation uses private functions, and user-facing
	// implementations (such as AddressSet) are just wrappers around the
	// underlying Set.
	// This means that we can only create new EnumerableSets for types that fit
	// in bytes32.

	struct Set {
		// Storage of set values
		bytes32[] _values;

		// Position of the value in the `values` array, plus 1 because index 0
		// means a value is not in the set.
		mapping(bytes32 => uint256) _indexes;
	}

	/**
	 * @dev Add a value to a set. O(1).
	 *
	 * Returns true if the value was added to the set, that is if it was not
	 * already present.
	 */
	function _add(Set storage set, bytes32 value) private returns (bool) {
		if (!_contains(set, value)) {
			set._values.push(value);
			// The value is stored at length-1, but we add 1 to all indexes
			// and use 0 as a sentinel value
			set._indexes[value] = set._values.length;
			return true;
		} else {
			return false;
		}
	}

	/**
	 * @dev Removes a value from a set. O(1).
	 *
	 * Returns true if the value was removed from the set, that is if it was
	 * present.
	 */
	function _remove(Set storage set, bytes32 value) private returns (bool) {
		// We read and store the value's index to prevent multiple reads from the same storage slot
		uint256 valueIndex = set._indexes[value];

		if (valueIndex != 0) {// Equivalent to contains(set, value)
			// To delete an element from the _values array in O(1), we swap the element to delete with the last one in
			// the array, and then remove the last element (sometimes called as 'swap and pop').
			// This modifies the order of the array, as noted in {at}.

			uint256 toDeleteIndex = valueIndex - 1;
			uint256 lastIndex = set._values.length - 1;

			// When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
			// so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

			bytes32 lastvalue = set._values[lastIndex];

			// Move the last value to the index where the value to delete is
			set._values[toDeleteIndex] = lastvalue;
			// Update the index for the moved value
			set._indexes[lastvalue] = toDeleteIndex + 1;
			// All indexes are 1-based

			// Delete the slot where the moved value was stored
			set._values.pop();

			// Delete the index for the deleted slot
			delete set._indexes[value];

			return true;
		} else {
			return false;
		}
	}

	/**
	 * @dev Returns true if the value is in the set. O(1).
	 */
	function _contains(Set storage set, bytes32 value) private view returns (bool) {
		return set._indexes[value] != 0;
	}

	/**
	 * @dev Returns the number of values on the set. O(1).
	 */
	function _length(Set storage set) private view returns (uint256) {
		return set._values.length;
	}

	/**
	 * @dev Returns the value stored at position `index` in the set. O(1).
	 *
	 * Note that there are no guarantees on the ordering of values inside the
	 * array, and it may change when more values are added or removed.
	 *
	 * Requirements:
	 *
	 * - `index` must be strictly less than {length}.
	 */
	function _at(Set storage set, uint256 index) private view returns (bytes32) {
		require(set._values.length > index, "EnumerableSet: index out of bounds");
		return set._values[index];
	}

	// AddressSet

	struct AddressSet {
		Set _inner;
	}

	/**
	 * @dev Add a value to a set. O(1).
	 *
	 * Returns true if the value was added to the set, that is if it was not
	 * already present.
	 */
	function add(AddressSet storage set, address value) internal returns (bool) {
		return _add(set._inner, bytes32(uint256(value)));
	}

	/**
	 * @dev Removes a value from a set. O(1).
	 *
	 * Returns true if the value was removed from the set, that is if it was
	 * present.
	 */
	function remove(AddressSet storage set, address value) internal returns (bool) {
		return _remove(set._inner, bytes32(uint256(value)));
	}

	/**
	 * @dev Returns true if the value is in the set. O(1).
	 */
	function contains(AddressSet storage set, address value) internal view returns (bool) {
		return _contains(set._inner, bytes32(uint256(value)));
	}

	/**
	 * @dev Returns the number of values in the set. O(1).
	 */
	function length(AddressSet storage set) internal view returns (uint256) {
		return _length(set._inner);
	}

	/**
	 * @dev Returns the value stored at position `index` in the set. O(1).
	 *
	 * Note that there are no guarantees on the ordering of values inside the
	 * array, and it may change when more values are added or removed.
	 *
	 * Requirements:
	 *
	 * - `index` must be strictly less than {length}.
	 */
	function at(AddressSet storage set, uint256 index) internal view returns (address) {
		return address(uint256(_at(set._inner, index)));
	}


	// UintSet

	struct UintSet {
		Set _inner;
	}

	/**
	 * @dev Add a value to a set. O(1).
	 *
	 * Returns true if the value was added to the set, that is if it was not
	 * already present.
	 */
	function add(UintSet storage set, uint256 value) internal returns (bool) {
		return _add(set._inner, bytes32(value));
	}

	/**
	 * @dev Removes a value from a set. O(1).
	 *
	 * Returns true if the value was removed from the set, that is if it was
	 * present.
	 */
	function remove(UintSet storage set, uint256 value) internal returns (bool) {
		return _remove(set._inner, bytes32(value));
	}

	/**
	 * @dev Returns true if the value is in the set. O(1).
	 */
	function contains(UintSet storage set, uint256 value) internal view returns (bool) {
		return _contains(set._inner, bytes32(value));
	}

	/**
	 * @dev Returns the number of values on the set. O(1).
	 */
	function length(UintSet storage set) internal view returns (uint256) {
		return _length(set._inner);
	}

	/**
	 * @dev Returns the value stored at position `index` in the set. O(1).
	 *
	 * Note that there are no guarantees on the ordering of values inside the
	 * array, and it may change when more values are added or removed.
	 *
	 * Requirements:
	 *
	 * - `index` must be strictly less than {length}.
	 */
	function at(UintSet storage set, uint256 index) internal view returns (uint256) {
		return uint256(_at(set._inner, index));
	}
}

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Library for managing an enumerable variant of Solidity's
 * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]
 * type.
 *
 * Maps have the following properties:
 *
 * - Entries are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Entries are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableMap for EnumerableMap.UintToAddressMap;
 *
 *     // Declare a set state variable
 *     EnumerableMap.UintToAddressMap private myMap;
 * }
 * ```
 *
 * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are
 * supported.
 */
library EnumerableMap {
	// To implement this library for multiple types with as little code
	// repetition as possible, we write it in terms of a generic Map type with
	// bytes32 keys and values.
	// The Map implementation uses private functions, and user-facing
	// implementations (such as Uint256ToAddressMap) are just wrappers around
	// the underlying Map.
	// This means that we can only create new EnumerableMaps for types that fit
	// in bytes32.

	struct MapEntry {
		bytes32 _key;
		bytes32 _value;
	}

	struct Map {
		// Storage of map keys and values
		MapEntry[] _entries;

		// Position of the entry defined by a key in the `entries` array, plus 1
		// because index 0 means a key is not in the map.
		mapping(bytes32 => uint256) _indexes;
	}

	/**
	 * @dev Adds a key-value pair to a map, or updates the value for an existing
	 * key. O(1).
	 *
	 * Returns true if the key was added to the map, that is if it was not
	 * already present.
	 */
	function _set(Map storage map, bytes32 key, bytes32 value) private returns (bool) {
		// We read and store the key's index to prevent multiple reads from the same storage slot
		uint256 keyIndex = map._indexes[key];

		if (keyIndex == 0) {// Equivalent to !contains(map, key)
			map._entries.push(MapEntry({_key : key, _value : value}));
			// The entry is stored at length-1, but we add 1 to all indexes
			// and use 0 as a sentinel value
			map._indexes[key] = map._entries.length;
			return true;
		} else {
			map._entries[keyIndex - 1]._value = value;
			return false;
		}
	}

	/**
	 * @dev Removes a key-value pair from a map. O(1).
	 *
	 * Returns true if the key was removed from the map, that is if it was present.
	 */
	function _remove(Map storage map, bytes32 key) private returns (bool) {
		// We read and store the key's index to prevent multiple reads from the same storage slot
		uint256 keyIndex = map._indexes[key];

		if (keyIndex != 0) {// Equivalent to contains(map, key)
			// To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one
			// in the array, and then remove the last entry (sometimes called as 'swap and pop').
			// This modifies the order of the array, as noted in {at}.

			uint256 toDeleteIndex = keyIndex - 1;
			uint256 lastIndex = map._entries.length - 1;

			// When the entry to delete is the last one, the swap operation is unnecessary. However, since this occurs
			// so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

			MapEntry storage lastEntry = map._entries[lastIndex];

			// Move the last entry to the index where the entry to delete is
			map._entries[toDeleteIndex] = lastEntry;
			// Update the index for the moved entry
			map._indexes[lastEntry._key] = toDeleteIndex + 1;
			// All indexes are 1-based

			// Delete the slot where the moved entry was stored
			map._entries.pop();

			// Delete the index for the deleted slot
			delete map._indexes[key];

			return true;
		} else {
			return false;
		}
	}

	/**
	 * @dev Returns true if the key is in the map. O(1).
	 */
	function _contains(Map storage map, bytes32 key) private view returns (bool) {
		return map._indexes[key] != 0;
	}

	/**
	 * @dev Returns the number of key-value pairs in the map. O(1).
	 */
	function _length(Map storage map) private view returns (uint256) {
		return map._entries.length;
	}

	/**
	 * @dev Returns the key-value pair stored at position `index` in the map. O(1).
	 *
	 * Note that there are no guarantees on the ordering of entries inside the
	 * array, and it may change when more entries are added or removed.
	 *
	 * Requirements:
	 *
	 * - `index` must be strictly less than {length}.
	 */
	function _at(Map storage map, uint256 index) private view returns (bytes32, bytes32) {
		require(map._entries.length > index, "EnumerableMap: index out of bounds");

		MapEntry storage entry = map._entries[index];
		return (entry._key, entry._value);
	}

	/**
	 * @dev Returns the value associated with `key`.  O(1).
	 *
	 * Requirements:
	 *
	 * - `key` must be in the map.
	 */
	function _get(Map storage map, bytes32 key) private view returns (bytes32) {
		return _get(map, key, "EnumerableMap: nonexistent key");
	}

	/**
	 * @dev Same as {_get}, with a custom error message when `key` is not in the map.
	 */
	function _get(Map storage map, bytes32 key, string memory errorMessage) private view returns (bytes32) {
		uint256 keyIndex = map._indexes[key];
		require(keyIndex != 0, errorMessage);
		// Equivalent to contains(map, key)
		return map._entries[keyIndex - 1]._value;
		// All indexes are 1-based
	}

	// UintToAddressMap

	struct UintToAddressMap {
		Map _inner;
	}

	/**
	 * @dev Adds a key-value pair to a map, or updates the value for an existing
	 * key. O(1).
	 *
	 * Returns true if the key was added to the map, that is if it was not
	 * already present.
	 */
	function set(UintToAddressMap storage map, uint256 key, address value) internal returns (bool) {
		return _set(map._inner, bytes32(key), bytes32(uint256(value)));
	}

	/**
	 * @dev Removes a value from a set. O(1).
	 *
	 * Returns true if the key was removed from the map, that is if it was present.
	 */
	function remove(UintToAddressMap storage map, uint256 key) internal returns (bool) {
		return _remove(map._inner, bytes32(key));
	}

	/**
	 * @dev Returns true if the key is in the map. O(1).
	 */
	function contains(UintToAddressMap storage map, uint256 key) internal view returns (bool) {
		return _contains(map._inner, bytes32(key));
	}

	/**
	 * @dev Returns the number of elements in the map. O(1).
	 */
	function length(UintToAddressMap storage map) internal view returns (uint256) {
		return _length(map._inner);
	}

	/**
	 * @dev Returns the element stored at position `index` in the set. O(1).
	 * Note that there are no guarantees on the ordering of values inside the
	 * array, and it may change when more values are added or removed.
	 *
	 * Requirements:
	 *
	 * - `index` must be strictly less than {length}.
	 */
	function at(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) {
		(bytes32 key, bytes32 value) = _at(map._inner, index);
		return (uint256(key), address(uint256(value)));
	}

	/**
	 * @dev Returns the value associated with `key`.  O(1).
	 *
	 * Requirements:
	 *
	 * - `key` must be in the map.
	 */
	function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {
		return address(uint256(_get(map._inner, bytes32(key))));
	}

	/**
	 * @dev Same as {get}, with a custom error message when `key` is not in the map.
	 */
	function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) {
		return address(uint256(_get(map._inner, bytes32(key), errorMessage)));
	}
}

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev String operations.
 */
library Strings {
	/**
	 * @dev Converts a `uint256` to its ASCII `string` 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);
		uint256 index = digits - 1;
		temp = value;
		while (temp != 0) {
			buffer[index--] = byte(uint8(48 + temp % 10));
			temp /= 10;
		}
		return string(buffer);
	}
}

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;












/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable {
	using SafeMath for uint256;
	using Address for address;
	using EnumerableSet for EnumerableSet.UintSet;
	using EnumerableMap for EnumerableMap.UintToAddressMap;
	using Strings for uint256;

	// Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
	// which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
	bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

	// Mapping from holder address to their (enumerable) set of owned tokens
	mapping(address => EnumerableSet.UintSet) private _holderTokens;

	// Enumerable mapping from token ids to their owners
	EnumerableMap.UintToAddressMap private _tokenOwners;

	// 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;

	// Token name
	string private _name;

	// Token symbol
	string private _symbol;

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

	// Base URI
	string private _baseURI;

	/*
	 *     bytes4(keccak256('balanceOf(address)')) == 0x70a08231
	 *     bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e
	 *     bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3
	 *     bytes4(keccak256('getApproved(uint256)')) == 0x081812fc
	 *     bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
	 *     bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
	 *     bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd
	 *     bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e
	 *     bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde
	 *
	 *     => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^
	 *        0xa22cb465 ^ 0xe985e9c ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
	 */
	bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;

	/*
	 *     bytes4(keccak256('name()')) == 0x06fdde03
	 *     bytes4(keccak256('symbol()')) == 0x95d89b41
	 *     bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd
	 *
	 *     => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f
	 */
	bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;

	/*
	 *     bytes4(keccak256('totalSupply()')) == 0x18160ddd
	 *     bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
	 *     bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
	 *
	 *     => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
	 */
	bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;

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

		// register the supported interfaces to conform to ERC721 via ERC165
		_registerInterface(_INTERFACE_ID_ERC721);
		_registerInterface(_INTERFACE_ID_ERC721_METADATA);
		_registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
	}

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

		return _holderTokens[owner].length();
	}

	/**
	 * @dev See {IERC721-ownerOf}.
	 */
	function ownerOf(uint256 tokenId) public view override returns (address) {
		return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
	}

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

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

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

		string memory _tokenURI = _tokenURIs[tokenId];

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

	/**
	* @dev Returns the base URI set via {_setBaseURI}. This will be
	* automatically added as a prefix in {tokenURI} to each token's URI, or
	* to the token ID if no specific URI is set for that token ID.
	*/
	function baseURI() public view returns (string memory) {
		return _baseURI;
	}

	/**
	 * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
	 */
	function tokenOfOwnerByIndex(address owner, uint256 index) public view override returns (uint256) {
		return _holderTokens[owner].at(index);
	}

	/**
	 * @dev See {IERC721Enumerable-totalSupply}.
	 */
	function totalSupply() public view override returns (uint256) {
		// _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds
		return _tokenOwners.length();
	}

	/**
	 * @dev See {IERC721Enumerable-tokenByIndex}.
	 */
	function tokenByIndex(uint256 index) public view override returns (uint256) {
		(uint256 tokenId,) = _tokenOwners.at(index);
		return tokenId;
	}

	/**
	 * @dev See {IERC721-approve}.
	 */
	function approve(address to, uint256 tokenId) public virtual override {
		address owner = 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 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 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 mecanisms 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 returns (bool) {
		return _tokenOwners.contains(tokenId);
	}

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

	/**
	 * @dev Safely mints `tokenId` and transfers it to `to`.
	 *
	 * Requirements:
	 d*
	 * - `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);

		_holderTokens[to].add(tokenId);

		_tokenOwners.set(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 = ownerOf(tokenId);

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

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

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

		_holderTokens[owner].remove(tokenId);

		_tokenOwners.remove(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(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);

		_holderTokens[from].remove(tokenId);
		_holderTokens[to].add(tokenId);

		_tokenOwners.set(tokenId, to);

		emit Transfer(from, to, tokenId);
	}

	/**
	 * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
	 *
	 * Requirements:
	 *
	 * - `tokenId` must exist.
	 */
	function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
		require(_exists(tokenId), "ERC721Metadata: URI set of nonexistent token");
		_tokenURIs[tokenId] = _tokenURI;
	}

	/**
	 * @dev Internal function to set the base URI for all token IDs. It is
	 * automatically added as a prefix to the value returned in {tokenURI},
	 * or to the token ID if {tokenURI} is empty.
	 */
	function _setBaseURI(string memory baseURI_) internal virtual {
		_baseURI = baseURI_;
	}

	/**
	 * @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()) {
			return true;
		}
		bytes memory returndata = to.functionCall(abi.encodeWithSelector(
				IERC721Receiver(to).onERC721Received.selector,
				_msgSender(),
				from,
				tokenId,
				_data
			), "ERC721: transfer to non ERC721Receiver implementer");
		bytes4 retval = abi.decode(returndata, (bytes4));
		return (retval == _ERC721_RECEIVED);
	}

	function _approve(address to, uint256 tokenId) private {
		_tokenApprovals[tokenId] = to;
		emit Approval(ownerOf(tokenId), to, tokenId);
	}

	/**
	 * @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/access/AccessControl.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;




/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context {
	using EnumerableSet for EnumerableSet.AddressSet;
	using Address for address;

	struct RoleData {
		EnumerableSet.AddressSet members;
		bytes32 adminRole;
	}

	mapping(bytes32 => RoleData) private _roles;

	bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

	/**
	 * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
	 *
	 * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
	 * {RoleAdminChanged} not being emitted signaling this.
	 *
	 * _Available since v3.1._
	 */
	event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

	/**
	 * @dev Emitted when `account` is granted `role`.
	 *
	 * `sender` is the account that originated the contract call, an admin role
	 * bearer except when using {_setupRole}.
	 */
	event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

	/**
	 * @dev Emitted when `account` is revoked `role`.
	 *
	 * `sender` is the account that originated the contract call:
	 *   - if using `revokeRole`, it is the admin role bearer
	 *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
	 */
	event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

	/**
	 * @dev Returns `true` if `account` has been granted `role`.
	 */
	function hasRole(bytes32 role, address account) public view returns (bool) {
		return _roles[role].members.contains(account);
	}

	/**
	 * @dev Returns the number of accounts that have `role`. Can be used
	 * together with {getRoleMember} to enumerate all bearers of a role.
	 */
	function getRoleMemberCount(bytes32 role) public view returns (uint256) {
		return _roles[role].members.length();
	}

	/**
	 * @dev Returns one of the accounts that have `role`. `index` must be a
	 * value between 0 and {getRoleMemberCount}, non-inclusive.
	 *
	 * Role bearers are not sorted in any particular way, and their ordering may
	 * change at any point.
	 *
	 * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
	 * you perform all queries on the same block. See the following
	 * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
	 * for more information.
	 */
	function getRoleMember(bytes32 role, uint256 index) public view returns (address) {
		return _roles[role].members.at(index);
	}

	/**
	 * @dev Returns the admin role that controls `role`. See {grantRole} and
	 * {revokeRole}.
	 *
	 * To change a role's admin, use {_setRoleAdmin}.
	 */
	function getRoleAdmin(bytes32 role) public view returns (bytes32) {
		return _roles[role].adminRole;
	}

	/**
	 * @dev Grants `role` to `account`.
	 *
	 * If `account` had not been already granted `role`, emits a {RoleGranted}
	 * event.
	 *
	 * Requirements:
	 *
	 * - the caller must have ``role``'s admin role.
	 */
	function grantRole(bytes32 role, address account) public virtual {
		require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant");

		_grantRole(role, account);
	}

	/**
	 * @dev Revokes `role` from `account`.
	 *
	 * If `account` had been granted `role`, emits a {RoleRevoked} event.
	 *
	 * Requirements:
	 *
	 * - the caller must have ``role``'s admin role.
	 */
	function revokeRole(bytes32 role, address account) public virtual {
		require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke");

		_revokeRole(role, account);
	}

	/**
	 * @dev Revokes `role` from the calling account.
	 *
	 * Roles are often managed via {grantRole} and {revokeRole}: this function's
	 * purpose is to provide a mechanism for accounts to lose their privileges
	 * if they are compromised (such as when a trusted device is misplaced).
	 *
	 * If the calling account had been granted `role`, emits a {RoleRevoked}
	 * event.
	 *
	 * Requirements:
	 *
	 * - the caller must be `account`.
	 */
	function renounceRole(bytes32 role, address account) public virtual {
		require(account == _msgSender(), "AccessControl: can only renounce roles for self");

		_revokeRole(role, account);
	}

	/**
	 * @dev Grants `role` to `account`.
	 *
	 * If `account` had not been already granted `role`, emits a {RoleGranted}
	 * event. Note that unlike {grantRole}, this function doesn't perform any
	 * checks on the calling account.
	 *
	 * [WARNING]
	 * ====
	 * This function should only be called from the constructor when setting
	 * up the initial roles for the system.
	 *
	 * Using this function in any other way is effectively circumventing the admin
	 * system imposed by {AccessControl}.
	 * ====
	 */
	function _setupRole(bytes32 role, address account) internal virtual {
		_grantRole(role, account);
	}

	/**
	 * @dev Sets `adminRole` as ``role``'s admin role.
	 *
	 * Emits a {RoleAdminChanged} event.
	 */
	function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
		emit RoleAdminChanged(role, _roles[role].adminRole, adminRole);
		_roles[role].adminRole = adminRole;
	}

	function _grantRole(bytes32 role, address account) private {
		if (_roles[role].members.add(account)) {
			emit RoleGranted(role, account, _msgSender());
		}
	}

	function _revokeRole(bytes32 role, address account) private {
		if (_roles[role].members.remove(account)) {
			emit RoleRevoked(role, account, _msgSender());
		}
	}
}

// File: contracts/common/AccessControlMixin.sol

pragma solidity 0.6.6;


contract AccessControlMixin is AccessControl {
	string private _revertMsg;

	function _setupContractId(string memory contractId) internal {
		_revertMsg = string(abi.encodePacked(contractId, ": INSUFFICIENT_PERMISSIONS"));
	}

	modifier only(bytes32 role) {
		require(
			hasRole(role, _msgSender()),
			_revertMsg
		);
		_;
	}
}

// File: contracts/child/ChildToken/IChildToken.sol

pragma solidity 0.6.6;

interface IChildToken {
	function deposit(address user, bytes calldata depositData) external;
}

// File: contracts/common/Initializable.sol

pragma solidity 0.6.6;

contract Initializable {
	bool inited = false;

	modifier initializer() {
		require(!inited, "already inited");
		_;
		inited = true;
	}
}

// File: contracts/common/EIP712Base.sol

pragma solidity 0.6.6;


contract EIP712Base is Initializable {
	struct EIP712Domain {
		string name;
		string version;
		address verifyingContract;
		bytes32 salt;
	}

	string constant public ERC712_VERSION = "1";

	bytes32 internal constant EIP712_DOMAIN_TYPEHASH = keccak256(
		bytes(
			"EIP712Domain(string name,string version,address verifyingContract,bytes32 salt)"
		)
	);
	bytes32 internal domainSeperator;

	// supposed to be called once while initializing.
	// one of the contractsa that inherits this contract follows proxy pattern
	// so it is not possible to do this in a constructor
	function _initializeEIP712(
		string memory name
	)
	internal
	initializer
	{
		_setDomainSeperator(name);
	}

	function _setDomainSeperator(string memory name) internal {
		domainSeperator = keccak256(
			abi.encode(
				EIP712_DOMAIN_TYPEHASH,
				keccak256(bytes(name)),
				keccak256(bytes(ERC712_VERSION)),
				address(this),
				bytes32(getChainId())
			)
		);
	}

	function getDomainSeperator() public view returns (bytes32) {
		return domainSeperator;
	}

	function getChainId() public pure returns (uint256) {
		uint256 id;
		assembly {
			id := chainid()
		}
		return id;
	}

	/**
	 * Accept message hash and returns hash message in EIP712 compatible form
	 * So that it can be used to recover signer from signature signed using EIP712 formatted data
	 * https://eips.ethereum.org/EIPS/eip-712
	 * "\\x19" makes the encoding deterministic
	 * "\\x01" is the version byte to make it compatible to EIP-191
	 */
	function toTypedMessageHash(bytes32 messageHash)
	internal
	view
	returns (bytes32)
	{
		return
		keccak256(
			abi.encodePacked("\x19\x01", getDomainSeperator(), messageHash)
		);
	}
}

// File: contracts/common/NativeMetaTransaction.sol

pragma solidity 0.6.6;


contract NativeMetaTransaction is EIP712Base {
	using SafeMath for uint256;
	bytes32 private constant META_TRANSACTION_TYPEHASH = keccak256(
		bytes(
			"MetaTransaction(uint256 nonce,address from,bytes functionSignature)"
		)
	);

	event MetaTransactionExecuted(
		address userAddress,
		address payable relayerAddress,
		bytes functionSignature
	);

	mapping(address => uint256) nonces;

	/*
	 * Meta transaction structure.
	 * No point of including value field here as if user is doing value transfer then he has the funds to pay for gas
	 * He should call the desired function directly in that case.
	 */
	struct MetaTransaction {
		uint256 nonce;
		address from;
		bytes functionSignature;
	}

	function executeMetaTransaction(
		address userAddress,
		bytes memory functionSignature,
		bytes32 sigR,
		bytes32 sigS,
		uint8 sigV
	) public payable returns (bytes memory) {
		MetaTransaction memory metaTx = MetaTransaction({
		nonce : nonces[userAddress],
		from : userAddress,
		functionSignature : functionSignature
		});

		require(
			verify(userAddress, metaTx, sigR, sigS, sigV),
			"Signer and signature do not match"
		);

		// increase nonce for user (to avoid re-use)
		nonces[userAddress] = nonces[userAddress].add(1);

		emit MetaTransactionExecuted(
			userAddress,
			msg.sender,
			functionSignature
		);

		// Append userAddress and relayer address at the end to extract it from calling context
		(bool success, bytes memory returnData) = address(this).call(
			abi.encodePacked(functionSignature, userAddress)
		);
		require(success, "Function call not successful");

		return returnData;
	}

	function hashMetaTransaction(MetaTransaction memory metaTx)
	internal
	pure
	returns (bytes32)
	{
		return
		keccak256(
			abi.encode(
				META_TRANSACTION_TYPEHASH,
				metaTx.nonce,
				metaTx.from,
				keccak256(metaTx.functionSignature)
			)
		);
	}

	function getNonce(address user) public view returns (uint256 nonce) {
		nonce = nonces[user];
	}

	function verify(
		address signer,
		MetaTransaction memory metaTx,
		bytes32 sigR,
		bytes32 sigS,
		uint8 sigV
	) internal view returns (bool) {
		require(signer != address(0), "NativeMetaTransaction: INVALID_SIGNER");
		return
		signer ==
		ecrecover(
			toTypedMessageHash(hashMetaTransaction(metaTx)),
			sigV,
			sigR,
			sigS
		);
	}
}

// File: contracts/common/ContextMixin.sol

pragma solidity 0.6.6;

abstract contract ContextMixin {
	function msgSender()
	internal
	view
	returns (address payable sender)
	{
		if (msg.sender == address(this)) {
			bytes memory array = msg.data;
			uint256 index = msg.data.length;
			assembly {
			// Load the 32 bytes word from memory with the address on the lower 20 bytes, and mask those.
				sender := and(
				mload(add(array, index)),
				0xffffffffffffffffffffffffffffffffffffffff
				)
			}
		} else {
			sender = msg.sender;
		}
		return sender;
	}
}

interface WETHInterface {
	function transferFrom(address _from, address _to, uint256 _value) external returns (bool);

	function approve(address _spender, uint256 _value) external returns (bool);

	function balanceOf(address _owner) external view returns (uint256);

	function transfer(address _to, uint256 _value) external returns (bool);
}

// File: contracts/child/ChildToken/ChildMintableERC721.sol
pragma experimental ABIEncoderV2;
pragma solidity 0.6.6;


contract ArtvatarsMintableERC721Child is
ERC721,
IChildToken,
AccessControlMixin,
NativeMetaTransaction,
ContextMixin
{
	using SafeMath for uint256;
	bytes32 public constant DEPOSITOR_ROLE = keccak256("DEPOSITOR_ROLE");
	bytes32 public constant SERVER_ROLE = keccak256("SERVER_ROLE");

	WETHInterface WETHContract;

	mapping(uint256 => bool) public withdrawnTokens;
	mapping(uint256 => Artvatar) public tokenToArtvatar;

	uint256 MAX_SUPPLY = 20000;
	uint256 MAX_BUY_ONCE = 2;
	// limit batching of tokens due to gas limit restrictions
	uint256 public constant BATCH_LIMIT = 20;

	uint256 public mintedTokens;
	bool public mintingClosed = false;
	bool public init = false;

	struct Attribute {
		string title;
		string name;
	}

	struct Artvatar {
		uint256 id;
		string series;
		string title;
		string description;
		string image;
		Attribute[] attributes;
		bool metadataChanged;
	}

	event WithdrawnBatch(address indexed user, uint256[] tokenIds);
	event TransferWithMetadata(address indexed from, address indexed to, uint256 indexed tokenId, bytes metaData);

	constructor(
		string memory name_,
		string memory symbol_,
		address server,
		address childChainManager
	) public ERC721(name_, symbol_) {
		WETHContract = WETHInterface(address(0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619));
		_setupContractId("ChildMintableERC721");
		_setupRole(DEFAULT_ADMIN_ROLE, _msgSender());
		_setupRole(SERVER_ROLE, server);
		_setupRole(DEPOSITOR_ROLE, childChainManager);
		_initializeEIP712(name_);
	}

	function initializeMinting() public only(DEFAULT_ADMIN_ROLE) {
		require(init == false, "INIT_ALREADY_CALLED");
		init = true;

		for (uint256 i = 0; i < 26; i++) {
			uint256 tokenId = mintedTokens;
			Artvatar storage artvatar = tokenToArtvatar[tokenId];
			artvatar.id = tokenId;
			require(!withdrawnTokens[tokenId], "ChildMintableERC721: TOKEN_EXISTS_ON_ROOT_CHAIN");
			_mint(_msgSender(), tokenId);
			mintedTokens = mintedTokens.add(1);
		}
	}

	function balanceWETH() public view returns (uint256) {
		return WETHContract.balanceOf(msgSender());
	}

	function setBaseURI(string memory _baseURI) public only(DEFAULT_ADMIN_ROLE) {
		_setBaseURI(_baseURI);
	}

	function ceil(uint a, uint m) public pure returns (uint) {
		return ((a + m - 1) / m) * m;
	}

	function calcPrice(uint256 _totalSupply, uint8 _amount) public pure returns (uint256) {
		return ceil(_totalSupply.mul(10000).div(5000), 10000).div(10000).mul(150000000000000000).mul(_amount);
	}

	// This is to support Native meta transactions
	// never use msg.sender directly, use _msgSender() instead
	function _msgSender()
	internal
	override
	view
	returns (address payable sender)
	{
		return ContextMixin.msgSender();
	}

	/**
	   * @notice called when token is deposited on root chain
	   * @dev Should be callable only by ChildChainManager
	   * Should handle deposit by minting the required tokenId(s) for user
	   * Should set `withdrawnTokens` mapping to `false` for the tokenId being deposited
	   * Minting can also be done by other functions
	   * @param user user address for whom deposit is being done
	   * @param depositData abi encoded tokenIds. Batch deposit also supported.
	   */
	function deposit(address user, bytes calldata depositData)
	external
	override
	only(DEPOSITOR_ROLE)
	{

		// deposit single
		if (depositData.length == 32) {
			uint256 tokenId = abi.decode(depositData, (uint256));
			withdrawnTokens[tokenId] = false;
			_mint(user, tokenId);

			// deposit batch
		} else {
			uint256[] memory tokenIds = abi.decode(depositData, (uint256[]));
			uint256 length = tokenIds.length;
			for (uint256 i; i < length; i++) {
				withdrawnTokens[tokenIds[i]] = false;
				_mint(user, tokenIds[i]);
			}
		}

	}

	/**
	 * @notice called when user wants to withdraw token back to root chain
	 * @dev Should handle withraw by burning user's token.
	 * Should set `withdrawnTokens` mapping to `true` for the tokenId being withdrawn
	 * This transaction will be verified when exiting on root chain
	 * @param tokenId tokenId to withdraw
	 */
	function withdraw(uint256 tokenId) external {
		require(_msgSender() == ownerOf(tokenId), "ChildMintableERC721: INVALID_TOKEN_OWNER");
		withdrawnTokens[tokenId] = true;

		emit TransferWithMetadata(ownerOf(tokenId), address(0), tokenId, this.encodeTokenMetadata(tokenId));

		_burn(tokenId);
	}

	/**
	 * @notice called when user wants to withdraw multiple tokens back to root chain
	 * @dev Should burn user's tokens. This transaction will be verified when exiting on root chain
	 * @param tokenIds tokenId list to withdraw
	 */
	function withdrawBatch(uint256[] calldata tokenIds) external {

		uint256 length = tokenIds.length;
		require(length <= BATCH_LIMIT, "ChildMintableERC721: EXCEEDS_BATCH_LIMIT");

		// Iteratively burn ERC721 tokens, for performing
		// batch withdraw
		for (uint256 i; i < length; i++) {

			uint256 tokenId = tokenIds[i];

			require(_msgSender() == ownerOf(tokenId), string(abi.encodePacked("ChildMintableERC721: INVALID_TOKEN_OWNER ", tokenId)));
			withdrawnTokens[tokenId] = true;

			emit TransferWithMetadata(ownerOf(tokenId), address(0), tokenId, this.encodeTokenMetadata(tokenId));

			_burn(tokenId);

		}

		// At last emit this event, which will be used
		// in MintableERC721 predicate contract on L1
		// while verifying burn proof
		emit WithdrawnBatch(_msgSender(), tokenIds);

	}

	/**
	 * @notice called when user wants to withdraw token back to root chain with token URI
	 * @dev Should handle withraw by burning user's token.
	 * Should set `withdrawnTokens` mapping to `true` for the tokenId being withdrawn
	 * This transaction will be verified when exiting on root chain
	 *
	 * @param tokenId tokenId to withdraw
	 */
	function withdrawWithMetadata(uint256 tokenId) external {

		require(_msgSender() == ownerOf(tokenId), "ChildMintableERC721: INVALID_TOKEN_OWNER");
		withdrawnTokens[tokenId] = true;

		// Encoding metadata associated with tokenId & emitting event
		emit TransferWithMetadata(ownerOf(tokenId), address(0), tokenId, this.encodeTokenMetadata(tokenId));

		_burn(tokenId);

	}

	/**
	 * @notice This method is supposed to be called by client when withdrawing token with metadata
	 * and pass return value of this function as second paramter of `withdrawWithMetadata` method
	 *
	 * It can be overridden by clients to encode data in a different form, which needs to
	 * be decoded back by them correctly during exiting
	 *
	 * @param tokenId Token for which URI to be fetched
	 */
	function encodeTokenMetadata(uint256 tokenId) external view virtual returns (bytes memory) {

		// You're always free to change this default implementation
		// and pack more data in byte array which can be decoded back
		// in L1

		Artvatar memory artvatar = tokenToArtvatar[tokenId];
		return abi.encode(artvatar, tokenURI(tokenId));

	}

	/**
	 * @notice Example function to handle minting tokens on matic chain
	 * @dev Minting can be done as per requirement,
	 * This implementation allows only admin to mint tokens but it can be changed as per requirement
	 * Should verify if token is withdrawn by checking `withdrawnTokens` mapping
	 * @param user user for whom tokens are being minted
	 * @param tokenId tokenId to mint
	 */
	function mint(address user, uint256 tokenId) public only(DEFAULT_ADMIN_ROLE) {
		require(!withdrawnTokens[tokenId], "ChildMintableERC721: TOKEN_EXISTS_ON_ROOT_CHAIN");
		_mint(user, tokenId);
	}

	function buyTokens(address _toAddress, uint8 _amount, uint256 _value) public {
		require(mintingClosed == false && init == true, "MINTING_CLOSED");
		require(mintedTokens.add(_amount) <= MAX_SUPPLY, "MAX_SUPPLY reached.");
		require(MAX_BUY_ONCE > 0 && _amount <= MAX_BUY_ONCE, "MAX_BUY_ONCE");

		uint256 totalPrice;

		for (uint256 i = 0; i < _amount; i++) {
			uint256 price = calcPrice(mintedTokens.add(1), 1);
			require(WETHContract.transferFrom(msgSender(), address(this), price) == true, "Not enough WETH");
			WETHContract.transfer(address(0x6F24CBca9A3Ae5eC552d94f8A69B4046a2794C67), price);

			uint256 tokenId = mintedTokens;
			Artvatar storage artvatar = tokenToArtvatar[tokenId];
			artvatar.id = tokenId;

			require(!withdrawnTokens[tokenId], "ChildMintableERC721: TOKEN_EXISTS_ON_ROOT_CHAIN");
			_mint(_toAddress, tokenId);

			mintedTokens = mintedTokens.add(1);
			totalPrice = totalPrice.add(price);
		}

		require(_value == totalPrice, "VALUE_TOTAL_MISSMATCH");
	}

	function changeMetadata(Artvatar memory _artvatar) public only(SERVER_ROLE) {
		Artvatar storage artvatar = tokenToArtvatar[_artvatar.id];
		require(artvatar.metadataChanged == false, "Metadata of token already changed");
		Attribute[] memory _attributes = _artvatar.attributes;
		artvatar.series = _artvatar.series;
		artvatar.title = _artvatar.title;
		artvatar.description = _artvatar.description;
		artvatar.image = _artvatar.image;

		for (uint256 i = 0; i < _attributes.length; i++) {
			Attribute memory attribute = _attributes[i];
			artvatar.attributes.push(attribute);
		}

		artvatar.metadataChanged = true;
	}

	function getArtvatarByTokenId(uint256 _tokenId) public view returns (Artvatar memory artvatar) {
		return tokenToArtvatar[_tokenId];
	}

	function closeMinting() public only(DEFAULT_ADMIN_ROLE) {
		mintingClosed = true;
	}
}

• No Contract Security Audit Submitted- Submit Audit Here

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payable","name":"relayerAddress","type":"address"},{"indexed":false,"internalType":"bytes","name":"functionSignature","type":"bytes"}],"name":"MetaTransactionExecuted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"previousAdminRole","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"newAdminRole","type":"bytes32"}],"name":"RoleAdminChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleGranted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleRevoked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"bytes","name":"metaData","type":"bytes"}],"name":"TransferWithMetadata","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256[]","name":"tokenIds","type":"uint256[]"}],"name":"WithdrawnBatch","type":"event"},{"inputs":[],"name":"BATCH_LIMIT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DEFAULT_ADMIN_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DEPOSITOR_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ERC712_VERSION","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"SERVER_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"balanceWETH","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"baseURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_toAddress","type":"address"},{"internalType":"uint8","name":"_amount","type":"uint8"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"buyTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_totalSupply","type":"uint256"},{"internalType":"uint8","name":"_amount","type":"uint8"}],"name":"calcPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"a","type":"uint256"},{"internalType":"uint256","name":"m","type":"uint256"}],"name":"ceil","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"string","name":"series","type":"string"},{"internalType":"string","name":"title","type":"string"},{"internalType":"string","name":"description","type":"string"},{"internalType":"string","name":"image","type":"string"},{"components":[{"internalType":"string","name":"title","type":"string"},{"internalType":"string","name":"name","type":"string"}],"internalType":"struct ArtvatarsMintableERC721Child.Attribute[]","name":"attributes","type":"tuple[]"},{"internalType":"bool","name":"metadataChanged","type":"bool"}],"internalType":"struct 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ability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"tokenToArtvatar","outputs":[{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"string","name":"series","type":"string"},{"internalType":"string","name":"title","type":"string"},{"internalType":"string","name":"description","type":"string"},{"internalType":"string","name":"image","type":"string"},{"internalType":"bool","name":"metadataChanged","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"tokenIds","type":"uint256[]"}],"name":"withdrawBatch","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"withdrawWithMetadata","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"withdrawnTokens","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c0000000000000000000000000c6b5f5084c9d80a40be1c6a9f1e62c086f5a43ef000000000000000000000000a6fa4fb5f76172d178d61b04b0ecd319c5d1c0aa0000000000000000000000000000000000000000000000000000000000000009417274766174617273000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000044152545600000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : name_ (string): Artvatars
Arg [1] : symbol_ (string): ARTV
Arg [2] : server (address): 0xc6b5f5084c9d80a40be1c6a9f1e62c086f5a43ef
Arg [3] : childChainManager (address): 0xa6fa4fb5f76172d178d61b04b0ecd319c5d1c0aa

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 000000000000000000000000c6b5f5084c9d80a40be1c6a9f1e62c086f5a43ef
Arg [3] : 000000000000000000000000a6fa4fb5f76172d178d61b04b0ecd319c5d1c0aa
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000009
Arg [5] : 4172747661746172730000000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [7] : 4152545600000000000000000000000000000000000000000000000000000000