MATIC Price: $1.00 (-0.69%)
Gas: 43 GWei
 

Overview

MATIC Balance

Polygon PoS Chain LogoPolygon PoS Chain LogoPolygon PoS Chain Logo0 MATIC

MATIC Value

$0.00

Token Holdings

Sponsored

Transaction Hash
Method
Block
From
To
Value
Mint DB Token221252432021-12-04 12:30:12845 days ago1638621012IN
0x21062695...d7821cFdc
0 MATIC0.0045360930
Mint DB Token221252282021-12-04 12:29:42845 days ago1638620982IN
0x21062695...d7821cFdc
0 MATIC0.0045360930
Mint DB Token221252232021-12-04 12:29:32845 days ago1638620972IN
0x21062695...d7821cFdc
0 MATIC0.0045360930
Mint DB Token221252022021-12-04 12:28:50845 days ago1638620930IN
0x21062695...d7821cFdc
0 MATIC0.0045360930
Mint DB Token221251872021-12-04 12:28:20845 days ago1638620900IN
0x21062695...d7821cFdc
0 MATIC0.0045360930
Mint DB Token221241862021-12-04 11:49:34845 days ago1638618574IN
0x21062695...d7821cFdc
0 MATIC0.005443336
Mint DB Token221241862021-12-04 11:49:34845 days ago1638618574IN
0x21062695...d7821cFdc
0 MATIC0.0054886636.3
Mint DB Token221241862021-12-04 11:49:34845 days ago1638618574IN
0x21062695...d7821cFdc
0 MATIC0.005443336
Mint DB Token221241862021-12-04 11:49:34845 days ago1638618574IN
0x21062695...d7821cFdc
0 MATIC0.005443336
Mint DB Token221241862021-12-04 11:49:34845 days ago1638618574IN
0x21062695...d7821cFdc
0 MATIC0.005890635
Mint DB Token221241862021-12-04 11:49:34845 days ago1638618574IN
0x21062695...d7821cFdc
0 MATIC0.0038543730
Mint DB Token169958012021-07-18 11:42:56984 days ago1626608576IN
0x21062695...d7821cFdc
0 MATIC0.000856134.61772087
0x60806040141173832021-05-05 10:42:551058 days ago1620211375IN
 Create: DBCToken
0 MATIC0.003214941

Parent Txn Hash Block From To Value
View All Internal Transactions
Loading...
Loading

Contract Source Code Verified (Exact Match)

Contract Name:
DBCToken

Compiler Version
v0.6.6+commit.6c089d02

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

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

pragma solidity ^0.6.0;
// produced by the Solididy File Flattener (c) David Appleton 2018 - 2021 and beyond
// contact : [email protected]
// source  : https://github.com/DaveAppleton/SolidityFlattery
// released under Apache 2.0 licence
// input  /Users/daveappleton/Documents/akombalabs/ZBCToken/contracts/DBCToken.sol
// flattened :  Wednesday, 05-May-21 07:22:53 UTC
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;
    }
}

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);
}

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];
    }

    // Bytes32Set

    struct Bytes32Set {
        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(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, 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(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set 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(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, 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(uint160(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(uint160(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(uint160(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(uint160(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));
    }
}

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);
}

library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @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) {
        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, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * 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);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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;
    }
}

library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

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

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

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

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

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

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

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

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

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

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

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

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

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

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

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 Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     */
    function _tryGet(Map storage map, bytes32 key) private view returns (bool, bytes32) {
        uint256 keyIndex = map._indexes[key];
        if (keyIndex == 0) return (false, 0); // Equivalent to contains(map, key)
        return (true, map._entries[keyIndex - 1]._value); // All indexes are 1-based
    }

    /**
     * @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) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, "EnumerableMap: nonexistent key"); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    /**
     * @dev Same as {_get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {_tryGet}.
     */
    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(uint160(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(uint160(uint256(value))));
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     *
     * _Available since v3.4._
     */
    function tryGet(UintToAddressMap storage map, uint256 key) internal view returns (bool, address) {
        (bool success, bytes32 value) = _tryGet(map._inner, bytes32(key));
        return (success, address(uint160(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(uint160(uint256(_get(map._inner, bytes32(key)))));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryGet}.
     */
    function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) {
        return address(uint160(uint256(_get(map._inner, bytes32(key), errorMessage))));
    }
}

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--] = bytes1(uint8(48 + temp % 10));
            temp /= 10;
        }
        return string(buffer);
    }
}

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;
}

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

abstract 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 virtual 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;
    }
}

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);
}

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);
}

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 ^ 0xe985e9c5 ^ 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 virtual 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 virtual override returns (address) {
        return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
    }

    /**
     * @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 _tokenURI = _tokenURIs[tokenId];
        string memory base = baseURI();

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

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

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual 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 virtual 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 = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

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

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

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

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

        _transfer(from, to, tokenId);
    }

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

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

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

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

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

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     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 = ERC721.ownerOf(tokenId); // internal owner

        _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(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own"); // internal owner
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

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

        _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(ERC721.ownerOf(tokenId), to, tokenId); // internal owner
    }

    /**
     * @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 { }
}

abstract contract  DBMetadata is ERC165, ERC721  {
    // for the dbc address field, we can check:
    // - length is 66
    // - first 3 chars match 'DBC'
    // - the chars at indexes [3, 12, 21, 30, 39, 48, 57] match '_'
    // - all other chars are between A-Z or 2-7

    // for node public key, we check the same, except with prefix 'DNK'

    // for genesis message, we require that user can only use [a-z, A-Z, 0-9, space]

    uint constant mask = 1 << 3 | 1 << 12 | 1 << 21 | 1 << 30 | 1 << 39 | 1 << 48 | 1 << 57;

    uint256 constant private accountAddressLength = 66;
    uint256 constant private nodePublicKeyLength = 66;
    uint256 constant private maxGenesisMessageLength = 100;

    struct Details {
        string    accountAddress;
        string    nodePublicKey;
        string    genesisMessage;
    }


    uint public lastModificationDate;

    // Optional mapping for token URIs
    mapping(uint256 => Details) private _tokenDetails;
    mapping(bytes32 => uint) public _allocatedAccountAddresses;
    mapping(bytes32 => uint) public _allocatedNodePublicKeys;

    modifier mValidAddress(string memory _address) {
        bool ok;
        bool zero;
        (ok,zero) = lengthOK(_address,accountAddressLength);
        if (!zero) {
            require(ok,"Account Address should be empty or 66 characters");
            require(matches(_address,0,"DBC"),"Address should start with 'DBC'");
            require(checkChars(_address,3),"Address should have '_' in positions [3, 12, 21, 30, 39, 48, 57], other chars A-Z or 2-7");
        } 
        _;
    }
    modifier mValidPubKey(string memory _key) {
        bool ok;
        bool zero;
        (ok,zero) = lengthOK(_key,nodePublicKeyLength);
        if (!zero) {
            require(ok,"Node Public Key should be empty or 66 characters");
            require(matches(_key,0,"DNK"),"Address should start with 'DNK'");
            require(checkChars(_key,3),"Address should have '_' in positions [3, 12, 21, 30, 39, 48, 57], other chars A-Z or 2-7");
        }
        _;
    }
    modifier mValidGenesis(string memory genesisMessage) {
        require(bytes(genesisMessage).length <= maxGenesisMessageLength,"Genesis Message is too long");
        require(alphaNumSpace(genesisMessage),"Only AlphaNumerics and spaces allowed in genesis message");
        _;
    }

    function lengthOK(string memory str, uint required) internal pure returns (bool ok, bool isZero) {
        uint len = bytes(str).length;
        ok = (len == required || len == 0);
        isZero = len == 0;
        return (ok,isZero);
    }


    function alphaNumSpace(string memory str) public pure returns (bool){
        bytes memory b = bytes(str);

        for(uint i; i<b.length; i++){
            bytes1 char = b[i];
            if(
                !(char >= 0x30 && char <= 0x39) && //9-0
                !(char >= 0x41 && char <= 0x5A) && //A-Z
                !(char >= 0x61 && char <= 0x7A) && //a-z
                !(char == 0x20) // <space>
            )
                return false;
        }
        return true;
    }

    function matches(string memory haystack, uint pos, string memory needle ) internal pure returns (bool) {
        bytes memory hay = bytes(haystack);
        bytes memory ndl = bytes(needle);
        for (uint i = 0; i < ndl.length; i++) {
            if (hay[pos+i] != ndl[i]) return false;
        }
        return true;
    }

    function isBase32(byte b) internal pure returns (bool) {
        return (
            (b >= 0x32 && b <= 0x37) || //2-7
            (b >= 0x41 && b <= 0x5A)  //A-Z
        );
    }
    
    function checkChar(string memory haystack, uint i) internal pure returns (bool) {
        bytes memory hay = bytes(haystack);
         if (1 << i & mask != 0) {
            if (hay[i] != '_') return false;
        } else {
            // check valid chars
            if (!isBase32(hay[i])) return false;
        }
        return true;
    }

    function checkChars(string memory haystack, uint start) internal pure returns (bool) {
        for (uint i = start; i < bytes(haystack).length; i++) {
            if (!checkChar(haystack,i)) return false;
        }
        return true;
    }

    /**
    * @dev Returns an URI for a given token ID
    * Throws if the token ID does not exist. May return an empty string.
    * @param tokenId uint256 ID of the token to query
    */
    function tokenDetails(uint256 tokenId) internal view returns (Details memory) {
        require(_exists(tokenId),"token does not exist");
        return _tokenDetails[tokenId];
    }

    /**
    * @dev Internal function to set the token URI for a given token
    * Reverts if the token ID does not exist
    * @param tokenId uint256 ID of the token to set its URI
    * @param accountAddress Address
    * @param nodePublicKey as requested
    * @param genesisMessage for
    */
    function setData(uint256 tokenId, string memory accountAddress, string memory nodePublicKey, string memory genesisMessage) public {
        require(msg.sender == ownerOf(tokenId),"unauthorised access");
        _setData(tokenId,accountAddress,nodePublicKey,genesisMessage);
    }
    
    function _setData(
        uint256 tokenId, 
        string memory accountAddress, 
        string memory nodePublicKey, 
        string memory genesisMessage) 
        internal 
        mValidAddress(accountAddress)
        mValidPubKey(nodePublicKey)
        mValidGenesis(genesisMessage)
    {
        require(_exists(tokenId),"Token ID does not exist");
        require(now <= lastModificationDate,"too late to change now"); // maybe just return? transfer?
        // require(bytes(genesisMessage).length <= maxGenesisMessageLength,"Genesis Message is too long");
        // require(alphaNumSpace(genesisMessage),"Only AlphaNumerics and spaces allowed in genesis message");
        Details storage thisTokenDetails = _tokenDetails[tokenId];
        // check that address is unique
        bytes32 oldAddressHash = keccak256(bytes(thisTokenDetails.accountAddress));
        _allocatedAccountAddresses[oldAddressHash] = 0;
        if (bytes(accountAddress).length != 0) {
            bytes32 hash = keccak256(bytes(accountAddress));
            require(_allocatedAccountAddresses[hash] == 0, "This accountAddress has already a token");
            _allocatedAccountAddresses[hash] = tokenId;
        }
        // check that nodePublicKey is unique
        bytes32 oldNodeHash = keccak256(bytes(thisTokenDetails.nodePublicKey));
        _allocatedNodePublicKeys[oldNodeHash] = 0;
        if (bytes(nodePublicKey).length != 0) {
            bytes32 hash = keccak256(bytes(nodePublicKey));
            require(_allocatedNodePublicKeys[hash] == 0, "This nodePublicKey has already a token");
            _allocatedNodePublicKeys[hash] = tokenId;
        }
        thisTokenDetails.accountAddress = accountAddress;
        thisTokenDetails.nodePublicKey = nodePublicKey;
        thisTokenDetails.genesisMessage = genesisMessage;
        //_tokenDetails[tokenId] = thisTokenDetails;
    }

    function getAccountAddress(uint256 tokenId) public view returns (string memory) {
        return tokenDetails(tokenId).accountAddress;
    }
    function getNodePublicKey(uint256 tokenId) public view returns (string memory) {
        return tokenDetails(tokenId).nodePublicKey;
    }
    function getGenesisMessage(uint256 tokenId) public view returns (string memory) {
        return tokenDetails(tokenId).genesisMessage;
    }

    function setAccountAddress(uint256 tokenId, string  memory _accountAddress) public {
        Details memory oldDetails = tokenDetails(tokenId);
        setData(tokenId,_accountAddress,oldDetails.nodePublicKey, oldDetails.genesisMessage);
    }

    function setAccountNodePublicKey(uint256 tokenId, string  memory _nodePublicKey) public {
        Details memory oldDetails = tokenDetails(tokenId);
        setData(tokenId,oldDetails.accountAddress,_nodePublicKey, oldDetails.genesisMessage);
    }

    function setAccountGenesisMessage(uint256 tokenId, string  memory _genesisMessage) public {
        Details memory oldDetails = tokenDetails(tokenId);
        setData(tokenId,oldDetails.accountAddress,oldDetails.nodePublicKey, _genesisMessage);
    }

    function canModify() public view returns (bool) {
        return now <= lastModificationDate;
    }

}

contract DBCToken is ERC721, DBMetadata, Ownable {
    using Strings for uint256;

    uint public MAX_DB_TOKEN;
    uint public lastTransferDate;
    

    string constant public description = "NFTs minted by this contract represent a Genesis Block Account of the DecBC blockchain, an evolution of ZooBC. For more information go to https://decbc.com";

    constructor () public  ERC721("DecBC Main Net","DecBC")
    {
        uint256 _lastModification = 1671508800;
        uint256 _lastTransfer     = 1669780800;

        require(_lastModification > _lastTransfer,"last mod must be after last transfer");
        require(_lastTransfer > now, "deadlines must be in the future");
        lastModificationDate = _lastModification;
        lastTransferDate = _lastTransfer;
        MAX_DB_TOKEN = 5000;
        super._setBaseURI("https://decbc.com/NFT/meta/");
        super.transferOwnership(0x20DD6BAcDD7Ebb8969250C584df4F476d258b4Cb);
    }

    function exists(uint256 tokenId) public view returns (bool){
        return super._exists(tokenId);
    }

    function mintDBToken(uint tokenID, address recipient) public onlyOwner {
        require(!exists(tokenID),"This token has been minted already");
        require(totalSupply() <= MAX_DB_TOKEN, "Limited issue of 5000 tokens");
        super._mint(recipient, tokenID);
    }

    function tokenURI(uint256 tokenId) public view override returns (string memory) {
        require(exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
        // reformat to directory structure as below
        string memory file = tokenId.toString();
        return string(abi.encodePacked(baseURI(),file,".json"));
    }

    function contractURI() public view returns (string memory) {
        string memory file = "contract.json";
        return string(abi.encodePacked(baseURI(), file ));
    }



    function _beforeTokenTransfer(address , address , uint256 tokenId) internal override {
        if (!super._exists(tokenId)) {
            return;
        }
        require(canTransfer(),"Tokens can no longer be transferred");
        super._setData(tokenId, "","","");
    }

    function canTransfer() public view returns (bool) {
        return now <= lastTransferDate;
    }

}

Contract Security Audit

Contract ABI

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"MAX_DB_TOKEN","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"_allocatedAccountAddresses","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"_allocatedNodePublicKeys","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"str","type":"string"}],"name":"alphaNumSpace","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","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":"baseURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"canModify","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"canTransfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"contractURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"description","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"exists","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getAccountAddress","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getGenesisMessage","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getNodePublicKey","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lastModificationDate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lastTransferDate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenID","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"}],"name":"mintDBToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"string","name":"_accountAddress","type":"string"}],"name":"setAccountAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"string","name":"_genesisMessage","type":"string"}],"name":"setAccountGenesisMessage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"string","name":"_nodePublicKey","type":"string"}],"name":"setAccountNodePublicKey","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"string","name":"accountAddress","type":"string"},{"internalType":"string","name":"nodePublicKey","type":"string"},{"internalType":"string","name":"genesisMessage","type":"string"}],"name":"setData","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"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":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

60806040523480156200001157600080fd5b50604080518082018252600e81526d111958d090c813585a5b8813995d60921b60208083019190915282518084019093526005835264446563424360d81b90830152906200006f6301ffc9a760e01b6001600160e01b036200022f16565b815162000084906006906020850190620003fe565b5080516200009a906007906020840190620003fe565b50620000b66380ac58cd60e01b6001600160e01b036200022f16565b620000d1635b5e139f60e01b6001600160e01b036200022f16565b620000ec63780e9d6360e01b6001600160e01b036200022f16565b5060009050620001046001600160e01b03620002b416565b600e80546001600160a01b0319166001600160a01b038316908117909155604051919250906000906000805160206200396b833981519152908290a3506363a13340636386d540428111620001a0576040805162461bcd60e51b815260206004820152601f60248201527f646561646c696e6573206d75737420626520696e207468652066757475726500604482015290519081900360640190fd5b600a8290556010819055611388600f5560408051808201909152601b81527f68747470733a2f2f64656362632e636f6d2f4e46542f6d6574612f0000000000602080830191909152620001fd919062002fbc620002b9821b17901c565b620002277320dd6bacdd7ebb8969250c584df4f476d258b4cb620002d260201b6200177d1760201c565b5050620004a0565b6001600160e01b031980821614156200028f576040805162461bcd60e51b815260206004820152601c60248201527f4552433136353a20696e76616c696420696e7465726661636520696400000000604482015290519081900360640190fd5b6001600160e01b0319166000908152602081905260409020805460ff19166001179055565b335b90565b8051620002ce906009906020840190620003fe565b5050565b620002e56001600160e01b03620002b416565b6001600160a01b0316620003016001600160e01b03620003ef16565b6001600160a01b0316146200035d576040805162461bcd60e51b815260206004820181905260248201527f4f776e61626c653a2063616c6c6572206973206e6f7420746865206f776e6572604482015290519081900360640190fd5b6001600160a01b038116620003a45760405162461bcd60e51b8152600401808060200182810382526026815260200180620039456026913960400191505060405180910390fd5b600e546040516001600160a01b038084169216906000805160206200396b83398151915290600090a3600e80546001600160a01b0319166001600160a01b0392909216919091179055565b600e546001600160a01b031690565b828054600181600116156101000203166002900490600052602060002090601f016020900481019282601f106200044157805160ff191683800117855562000471565b8280016001018555821562000471579182015b828111156200047157825182559160200191906001019062000454565b506200047f92915062000483565b5090565b620002b691905b808211156200047f57600081556001016200048a565b61349580620004b06000396000f3fe608060405234801561001057600080fd5b506004361061023d5760003560e01c80637284e4161161013b578063c87b56dd116100b8578063e3d9d21c1161007c578063e3d9d21c14610ae1578063e8a3d48514610ae9578063e985e9c514610af1578063f2fde38b14610b1f578063f440ccce14610b455761023d565b8063c87b56dd14610a7a578063d9de114514610a97578063db4cf8e614610a9f578063dd69b85014610abc578063df68c1a214610ad95761023d565b8063a8bf2b2e116100ff578063a8bf2b2e1461081e578063b88d4fde1461084a578063be59bdc11461090e578063c24b6c2c1461092b578063c6ace442146109d65761023d565b80637284e4161461072d5780638da5cb5b1461073557806395d89b411461073d578063a1ff887b14610745578063a22cb465146107f05761023d565b806342842e0e116101c95780636c0360eb1161018d5780636c0360eb146104975780636dd971e91461049f5780636e878ea11461065457806370a08231146106ff578063715018a6146107255761023d565b806342842e0e146104025780634f558e79146104385780634f6ccce7146104555780636352211e146104725780636ae115a31461048f5761023d565b806318160ddd1161021057806318160ddd1461036157806323b872dd1461037b5780632f745c59146103b1578063333a32e5146103dd5780633a1620f7146103e55761023d565b806301ffc9a71461024257806306fdde031461027d578063081812fc146102fa578063095ea7b314610333575b600080fd5b6102696004803603602081101561025857600080fd5b50356001600160e01b031916610b62565b604080519115158252519081900360200190f35b610285610b85565b6040805160208082528351818301528351919283929083019185019080838360005b838110156102bf5781810151838201526020016102a7565b50505050905090810190601f1680156102ec5780820380516001836020036101000a031916815260200191505b509250505060405180910390f35b6103176004803603602081101561031057600080fd5b5035610c1c565b604080516001600160a01b039092168252519081900360200190f35b61035f6004803603604081101561034957600080fd5b506001600160a01b038135169060200135610c7e565b005b610369610d59565b60408051918252519081900360200190f35b61035f6004803603606081101561039157600080fd5b506001600160a01b03813581169160208101359091169060400135610d6a565b610369600480360360408110156103c757600080fd5b506001600160a01b038135169060200135610dc1565b610269610df2565b610369600480360360208110156103fb57600080fd5b5035610dfb565b61035f6004803603606081101561041857600080fd5b506001600160a01b03813581169160208101359091169060400135610e0d565b6102696004803603602081101561044e57600080fd5b5035610e28565b6103696004803603602081101561046b57600080fd5b5035610e33565b6103176004803603602081101561048857600080fd5b5035610e4f565b610369610e7d565b610285610e83565b61035f600480360360808110156104b557600080fd5b81359190810190604081016020820135600160201b8111156104d657600080fd5b8201836020820111156104e857600080fd5b803590602001918460018302840111600160201b8311171561050957600080fd5b91908080601f0160208091040260200160405190810160405280939291908181526020018383808284376000920191909152509295949360208101935035915050600160201b81111561055b57600080fd5b82018360208201111561056d57600080fd5b803590602001918460018302840111600160201b8311171561058e57600080fd5b91908080601f0160208091040260200160405190810160405280939291908181526020018383808284376000920191909152509295949360208101935035915050600160201b8111156105e057600080fd5b8201836020820111156105f257600080fd5b803590602001918460018302840111600160201b8311171561061357600080fd5b91908080601f016020809104026020016040519081016040528093929190818152602001838380828437600092019190915250929550610ee4945050505050565b61035f6004803603604081101561066a57600080fd5b81359190810190604081016020820135600160201b81111561068b57600080fd5b82018360208201111561069d57600080fd5b803590602001918460018302840111600160201b831117156106be57600080fd5b91908080601f016020809104026020016040519081016040528093929190818152602001838380828437600092019190915250929550610f5a945050505050565b6103696004803603602081101561071557600080fd5b50356001600160a01b0316610f81565b61035f610fe9565b6102856110a7565b6103176110c3565b6102856110d2565b61035f6004803603604081101561075b57600080fd5b81359190810190604081016020820135600160201b81111561077c57600080fd5b82018360208201111561078e57600080fd5b803590602001918460018302840111600160201b831117156107af57600080fd5b91908080601f016020809104026020016040519081016040528093929190818152602001838380828437600092019190915250929550611133945050505050565b61035f6004803603604081101561080657600080fd5b506001600160a01b038135169060200135151561115a565b61035f6004803603604081101561083457600080fd5b50803590602001356001600160a01b031661125f565b61035f6004803603608081101561086057600080fd5b6001600160a01b03823581169260208101359091169160408201359190810190608081016060820135600160201b81111561089a57600080fd5b8201836020820111156108ac57600080fd5b803590602001918460018302840111600160201b831117156108cd57600080fd5b91908080601f016020809104026020016040519081016040528093929190818152602001838380828437600092019190915250929550611384945050505050565b6102856004803603602081101561092457600080fd5b50356113dc565b61035f6004803603604081101561094157600080fd5b81359190810190604081016020820135600160201b81111561096257600080fd5b82018360208201111561097457600080fd5b803590602001918460018302840111600160201b8311171561099557600080fd5b91908080601f0160208091040260200160405190810160405280939291908181526020018383808284376000920191909152509295506113f1945050505050565b610269600480360360208110156109ec57600080fd5b810190602081018135600160201b811115610a0657600080fd5b820183602082011115610a1857600080fd5b803590602001918460018302840111600160201b83111715610a3957600080fd5b91908080601f016020809104026020016040519081016040528093929190818152602001838380828437600092019190915250929550611418945050505050565b61028560048036036020811015610a9057600080fd5b5035611510565b610369611631565b61028560048036036020811015610ab557600080fd5b5035611637565b61036960048036036020811015610ad257600080fd5b5035611649565b61026961165b565b610369611664565b61028561166a565b61026960048036036040811015610b0757600080fd5b506001600160a01b038135811691602001351661174f565b61035f60048036036020811015610b3557600080fd5b50356001600160a01b031661177d565b61028560048036036020811015610b5b57600080fd5b5035611892565b6001600160e01b0319811660009081526020819052604090205460ff165b919050565b60068054604080516020601f6002600019610100600188161502019095169490940493840181900481028201810190925282815260609390929091830182828015610c115780601f10610be657610100808354040283529160200191610c11565b820191906000526020600020905b815481529060010190602001808311610bf457829003601f168201915b505050505090505b90565b6000610c27826118a7565b610c625760405162461bcd60e51b815260040180806020018281038252602c81526020018061324a602c913960400191505060405180910390fd5b506000908152600460205260409020546001600160a01b031690565b6000610c8982610e4f565b9050806001600160a01b0316836001600160a01b03161415610cdc5760405162461bcd60e51b81526004018080602001828103825260218152602001806132ce6021913960400191505060405180910390fd5b806001600160a01b0316610cee6118ba565b6001600160a01b03161480610d0f5750610d0f81610d0a6118ba565b61174f565b610d4a5760405162461bcd60e51b81526004018080602001828103825260388152602001806131356038913960400191505060405180910390fd5b610d5483836118be565b505050565b6000610d65600261192c565b905090565b610d7b610d756118ba565b82611937565b610db65760405162461bcd60e51b81526004018080602001828103825260318152602001806133b06031913960400191505060405180910390fd5b610d548383836119db565b6001600160a01b0382166000908152600160205260408120610de9908363ffffffff611b3916565b90505b92915050565b600a5442111590565b600c6020526000908152604090205481565b610d5483838360405180602001604052806000815250611384565b6000610dec826118a7565b600080610e4760028463ffffffff611b4516565b509392505050565b6000610dec82604051806060016040528060298152602001613197602991396002919063ffffffff611b6116565b60105481565b60098054604080516020601f6002600019610100600188161502019095169490940493840181900481028201810190925282815260609390929091830182828015610c115780601f10610be657610100808354040283529160200191610c11565b610eed84610e4f565b6001600160a01b0316336001600160a01b031614610f48576040805162461bcd60e51b8152602060048201526013602482015272756e617574686f72697365642061636365737360681b604482015290519081900360640190fd5b610f5484848484611b78565b50505050565b610f62612f03565b610f6b83612137565b9050610d54838260000151848460400151610ee4565b60006001600160a01b038216610fc85760405162461bcd60e51b815260040180806020018281038252602a81526020018061316d602a913960400191505060405180910390fd5b6001600160a01b0382166000908152600160205260409020610dec9061192c565b610ff16118ba565b6001600160a01b03166110026110c3565b6001600160a01b03161461105d576040805162461bcd60e51b815260206004820181905260248201527f4f776e61626c653a2063616c6c6572206973206e6f7420746865206f776e6572604482015290519081900360640190fd5b600e546040516000916001600160a01b0316907f8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0908390a3600e80546001600160a01b0319169055565b6040518060c00160405280609b8152602001613315609b913981565b600e546001600160a01b031690565b60078054604080516020601f6002600019610100600188161502019095169490940493840181900481028201810190925282815260609390929091830182828015610c115780601f10610be657610100808354040283529160200191610c11565b61113b612f03565b61114483612137565b9050610d54838260000151836020015185610ee4565b6111626118ba565b6001600160a01b0316826001600160a01b031614156111c8576040805162461bcd60e51b815260206004820152601960248201527f4552433732313a20617070726f766520746f2063616c6c657200000000000000604482015290519081900360640190fd5b80600560006111d56118ba565b6001600160a01b03908116825260208083019390935260409182016000908120918716808252919093529120805460ff1916921515929092179091556112196118ba565b60408051841515815290516001600160a01b0392909216917f17307eab39ab6107e8899845ad3d59bd9653f200f220920489ca2b5937696c319181900360200190a35050565b6112676118ba565b6001600160a01b03166112786110c3565b6001600160a01b0316146112d3576040805162461bcd60e51b815260206004820181905260248201527f4f776e61626c653a2063616c6c6572206973206e6f7420746865206f776e6572604482015290519081900360640190fd5b6112dc82610e28565b156113185760405162461bcd60e51b81526004018080602001828103825260228152602001806131136022913960400191505060405180910390fd5b600f54611323610d59565b1115611376576040805162461bcd60e51b815260206004820152601c60248201527f4c696d69746564206973737565206f66203530303020746f6b656e7300000000604482015290519081900360640190fd5b6113808183612372565b5050565b61139561138f6118ba565b83611937565b6113d05760405162461bcd60e51b81526004018080602001828103825260318152602001806133b06031913960400191505060405180910390fd5b610f54848484846124ac565b60606113e782612137565b6020015192915050565b6113f9612f03565b61140283612137565b9050610d54838383602001518460400151610ee4565b600081815b815181101561150657600082828151811061143457fe5b01602001516001600160f81b0319169050600360fc1b81108015906114675750603960f81b6001600160f81b0319821611155b15801561149d5750604160f81b6001600160f81b031982161080159061149b5750602d60f91b6001600160f81b0319821611155b155b80156114d25750606160f81b6001600160f81b03198216108015906114d05750603d60f91b6001600160f81b0319821611155b155b80156114ec5750600160fd1b6001600160f81b0319821614155b156114fd5760009350505050610b80565b5060010161141d565b5060019392505050565b606061151b82610e28565b6115565760405162461bcd60e51b815260040180806020018281038252602f81526020018061329f602f913960400191505060405180910390fd5b6060611561836124fe565b905061156b610e83565b816040516020018083805190602001908083835b6020831061159e5780518252601f19909201916020918201910161157f565b51815160209384036101000a600019018019909216911617905285519190930192850191508083835b602083106115e65780518252601f1990920191602091820191016115c7565b5181516020939093036101000a600019018019909116921691909117905264173539b7b760d91b92019182525060408051808303601a19018152600590920190529695505050505050565b600f5481565b606061164282612137565b5192915050565b600d6020526000908152604090205481565b60105442111590565b600a5481565b60408051808201909152600d81526c31b7b73a3930b1ba173539b7b760991b6020820152606090611699610e83565b816040516020018083805190602001908083835b602083106116cc5780518252601f1990920191602091820191016116ad565b51815160209384036101000a600019018019909216911617905285519190930192850191508083835b602083106117145780518252601f1990920191602091820191016116f5565b6001836020036101000a0380198251168184511680821785525050505050509050019250505060405160208183030381529060405291505090565b6001600160a01b03918216600090815260056020908152604080832093909416825291909152205460ff1690565b6117856118ba565b6001600160a01b03166117966110c3565b6001600160a01b0316146117f1576040805162461bcd60e51b815260206004820181905260248201527f4f776e61626c653a2063616c6c6572206973206e6f7420746865206f776e6572604482015290519081900360640190fd5b6001600160a01b0381166118365760405162461bcd60e51b81526004018080602001828103825260268152602001806130246026913960400191505060405180910390fd5b600e546040516001600160a01b038084169216907f8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e090600090a3600e80546001600160a01b0319166001600160a01b0392909216919091179055565b606061189d82612137565b6040015192915050565b6000610dec60028363ffffffff6125d916565b3390565b600081815260046020526040902080546001600160a01b0319166001600160a01b03841690811790915581906118f382610e4f565b6001600160a01b03167f8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b92560405160405180910390a45050565b6000610dec826125e5565b6000611942826118a7565b61197d5760405162461bcd60e51b815260040180806020018281038252602c8152602001806130e7602c913960400191505060405180910390fd5b600061198883610e4f565b9050806001600160a01b0316846001600160a01b031614806119c35750836001600160a01b03166119b884610c1c565b6001600160a01b0316145b806119d357506119d3818561174f565b949350505050565b826001600160a01b03166119ee82610e4f565b6001600160a01b031614611a335760405162461bcd60e51b81526004018080602001828103825260298152602001806132766029913960400191505060405180910390fd5b6001600160a01b038216611a785760405162461bcd60e51b815260040180806020018281038252602481526020018061307a6024913960400191505060405180910390fd5b611a838383836125e9565b611a8e6000826118be565b6001600160a01b0383166000908152600160205260409020611ab6908263ffffffff61267716565b506001600160a01b0382166000908152600160205260409020611adf908263ffffffff61268316565b50611af26002828463ffffffff61268f16565b5080826001600160a01b0316846001600160a01b03167fddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef60405160405180910390a4505050565b6000610de983836126a5565b6000808080611b548686612709565b9097909650945050505050565b6000611b6e848484612784565b90505b9392505050565b82600080611b8783604261284e565b909250905080611c8b5781611bcd5760405162461bcd60e51b81526004018080602001828103825260308152602001806131e26030913960400191505060405180910390fd5b611bf48360006040518060400160405280600381526020016244424360e81b81525061286c565b611c45576040805162461bcd60e51b815260206004820152601f60248201527f416464726573732073686f756c64207374617274207769746820274442432700604482015290519081900360640190fd5b611c508360036128df565b611c8b5760405162461bcd60e51b81526004018080602001828103825260588152602001806133e16058913960600191505060405180910390fd5b84600080611c9a83604261284e565b909250905080611d9e5781611ce05760405162461bcd60e51b815260040180806020018281038252603081526020018061304a6030913960400191505060405180910390fd5b611d0783600060405180604001604052806003815260200162444e4b60e81b81525061286c565b611d58576040805162461bcd60e51b815260206004820152601f60248201527f416464726573732073686f756c6420737461727420776974682027444e4b2700604482015290519081900360640190fd5b611d638360036128df565b611d9e5760405162461bcd60e51b81526004018080602001828103825260588152602001806133e16058913960600191505060405180910390fd5b86606481511115611df6576040805162461bcd60e51b815260206004820152601b60248201527f47656e65736973204d65737361676520697320746f6f206c6f6e670000000000604482015290519081900360640190fd5b611dff81611418565b611e3a5760405162461bcd60e51b81526004018080602001828103825260388152602001806132126038913960400191505060405180910390fd5b611e438b6118a7565b611e94576040805162461bcd60e51b815260206004820152601760248201527f546f6b656e20494420646f6573206e6f74206578697374000000000000000000604482015290519081900360640190fd5b600a54421115611ee4576040805162461bcd60e51b8152602060048201526016602482015275746f6f206c61746520746f206368616e6765206e6f7760501b604482015290519081900360640190fd5b60008b8152600b60205260408082209051815491929183919081908390600260001961010060018416150201909116048015611f575780601f10611f35576101008083540402835291820191611f57565b820191906000526020600020905b815481529060010190602001808311611f43575b505060408051918290039091206000818152600c602052918220919091558e51909350159150611fec9050578b516020808e01919091206000818152600c90925260409091205415611fda5760405162461bcd60e51b81526004018080602001828103825260278152602001806134396027913960400191505060405180910390fd5b6000908152600c602052604090208d90555b600082600101604051808280546001816001161561010002031660029004801561204d5780601f1061202b57610100808354040283529182019161204d565b820191906000526020600020905b815481529060010190602001808311612039575b505060408051918290039091206000818152600d602052918220919091558e519093501591506120e29050578b516020808e01919091206000818152600d909252604090912054156120d05760405162461bcd60e51b81526004018080602001828103825260268152602001806132ef6026913960400191505060405180910390fd5b6000908152600d602052604090208e90555b8c8360000190805190602001906120fa929190612f24565b508b5161211090600185019060208f0190612f24565b508a5161212690600285019060208e0190612f24565b505050505050505050505050505050565b61213f612f03565b612148826118a7565b612190576040805162461bcd60e51b81526020600482015260146024820152731d1bdad95b88191bd95cc81b9bdd08195e1a5cdd60621b604482015290519081900360640190fd5b6000828152600b60209081526040918290208251815460026001821615610100026000190190911604601f8101849004909302810160809081019094526060810183815290939192849284919084018282801561222e5780601f106122035761010080835404028352916020019161222e565b820191906000526020600020905b81548152906001019060200180831161221157829003601f168201915b50505050508152602001600182018054600181600116156101000203166002900480601f0160208091040260200160405190810160405280929190818152602001828054600181600116156101000203166002900480156122d05780601f106122a5576101008083540402835291602001916122d0565b820191906000526020600020905b8154815290600101906020018083116122b357829003601f168201915b5050509183525050600282810180546040805160206001841615610100026000190190931694909404601f810183900483028501830190915280845293810193908301828280156123625780601f1061233757610100808354040283529160200191612362565b820191906000526020600020905b81548152906001019060200180831161234557829003601f168201915b5050505050815250509050919050565b6001600160a01b0382166123cd576040805162461bcd60e51b815260206004820181905260248201527f4552433732313a206d696e7420746f20746865207a65726f2061646472657373604482015290519081900360640190fd5b6123d6816118a7565b15612428576040805162461bcd60e51b815260206004820152601c60248201527f4552433732313a20746f6b656e20616c7265616479206d696e74656400000000604482015290519081900360640190fd5b612434600083836125e9565b6001600160a01b038216600090815260016020526040902061245c908263ffffffff61268316565b5061246f6002828463ffffffff61268f16565b5060405181906001600160a01b038416906000907fddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef908290a45050565b6124b78484846119db565b6124c38484848461290c565b610f545760405162461bcd60e51b8152600401808060200182810382526032815260200180612ff26032913960400191505060405180910390fd5b60608161252357506040805180820190915260018152600360fc1b6020820152610b80565b8160005b811561253b57600101600a82049150612527565b60608167ffffffffffffffff8111801561255457600080fd5b506040519080825280601f01601f19166020018201604052801561257f576020820181803683370190505b50859350905060001982015b83156125d057600a840660300160f81b828280600190039350815181106125ae57fe5b60200101906001600160f81b031916908160001a905350600a8404935061258b565b50949350505050565b6000610de98383612a8c565b5490565b6125f2816118a7565b6125fb57610d54565b61260361165b565b61263e5760405162461bcd60e51b815260040180806020018281038252602381526020018061309e6023913960400191505060405180910390fd5b610d5481604051806020016040528060008152506040518060200160405280600081525060405180602001604052806000815250611b78565b6000610de98383612aa4565b6000610de98383612b6a565b6000611b6e84846001600160a01b038516612bb4565b815460009082106126e75760405162461bcd60e51b8152600401808060200182810382526022815260200180612fd06022913960400191505060405180910390fd5b8260000182815481106126f657fe5b9060005260206000200154905092915050565b81546000908190831061274d5760405162461bcd60e51b81526004018080602001828103825260228152602001806131c06022913960400191505060405180910390fd5b600084600001848154811061275e57fe5b906000526020600020906002020190508060000154816001015492509250509250929050565b6000828152600184016020526040812054828161281f5760405162461bcd60e51b81526004018080602001828103825283818151815260200191508051906020019080838360005b838110156127e45781810151838201526020016127cc565b50505050905090810190601f1680156128115780820380516001836020036101000a031916815260200191505b509250505060405180910390fd5b5084600001600182038154811061283257fe5b9060005260206000209060020201600101549150509392505050565b8151600090819083811480612861575080155b959015945092505050565b60008382825b81518110156128d25781818151811061288757fe5b602001015160f81c60f81b6001600160f81b03191683828801815181106128aa57fe5b01602001516001600160f81b031916146128ca5760009350505050611b71565b600101612872565b5060019695505050505050565b6000815b8351811015611506576128f68482612c4b565b612904576000915050610dec565b6001016128e3565b6000612920846001600160a01b0316612cc7565b61292c575060016119d3565b6060612a52630a85bd0160e11b6129416118ba565b88878760405160240180856001600160a01b03166001600160a01b03168152602001846001600160a01b03166001600160a01b0316815260200183815260200180602001828103825283818151815260200191508051906020019080838360005b838110156129ba5781810151838201526020016129a2565b50505050905090810190601f1680156129e75780820380516001836020036101000a031916815260200191505b5095505050505050604051602081830303815290604052906001600160e01b0319166020820180516001600160e01b038381831617835250505050604051806060016040528060328152602001612ff2603291396001600160a01b038816919063ffffffff612ccd16565b90506000818060200190516020811015612a6b57600080fd5b50516001600160e01b031916630a85bd0160e11b1492505050949350505050565b60009081526001919091016020526040902054151590565b60008181526001830160205260408120548015612b605783546000198083019190810190600090879083908110612ad757fe5b9060005260206000200154905080876000018481548110612af457fe5b600091825260208083209091019290925582815260018981019092526040902090840190558654879080612b2457fe5b60019003818190600052602060002001600090559055866001016000878152602001908152602001600020600090556001945050505050610dec565b6000915050610dec565b6000612b768383612a8c565b612bac57508154600181810184556000848152602080822090930184905584548482528286019093526040902091909155610dec565b506000610dec565b600082815260018401602052604081205480612c19575050604080518082018252838152602080820184815286546001818101895560008981528481209551600290930290950191825591519082015586548684528188019092529290912055611b71565b82856000016001830381548110612c2c57fe5b9060005260206000209060020201600101819055506000915050611b71565b6000826001831b6702010080402010081615612c9657808381518110612c6d57fe5b6020910101516001600160f81b031916605f60f81b14612c91576000915050610dec565b611506565b612cb9818481518110612ca557fe5b01602001516001600160f81b031916612cdc565b611506576000915050610dec565b3b151590565b6060611b6e8484600085612d41565b6000601960f91b6001600160f81b0319831610801590612d0a5750603760f81b6001600160f81b0319831611155b80610dec5750604160f81b6001600160f81b0319831610801590610dec575050602d60f91b6001600160f81b031991909116111590565b606082471015612d825760405162461bcd60e51b81526004018080602001828103825260268152602001806130c16026913960400191505060405180910390fd5b612d8b85612cc7565b612ddc576040805162461bcd60e51b815260206004820152601d60248201527f416464726573733a2063616c6c20746f206e6f6e2d636f6e7472616374000000604482015290519081900360640190fd5b60006060866001600160a01b031685876040518082805190602001908083835b60208310612e1b5780518252601f199092019160209182019101612dfc565b6001836020036101000a03801982511681845116808217855250505050505090500191505060006040518083038185875af1925050503d8060008114612e7d576040519150601f19603f3d011682016040523d82523d6000602084013e612e82565b606091505b5091509150612e92828286612e9d565b979650505050505050565b60608315612eac575081611b71565b825115612ebc5782518084602001fd5b60405162461bcd60e51b81526020600482018181528451602484015284518593919283926044019190850190808383600083156127e45781810151838201526020016127cc565b60405180606001604052806060815260200160608152602001606081525090565b828054600181600116156101000203166002900490600052602060002090601f016020900481019282601f10612f6557805160ff1916838001178555612f92565b82800160010185558215612f92579182015b82811115612f92578251825591602001919060010190612f77565b50612f9e929150612fa2565b5090565b610c1991905b80821115612f9e5760008155600101612fa8565b8051611380906009906020840190612f2456fe456e756d657261626c655365743a20696e646578206f7574206f6620626f756e64734552433732313a207472616e7366657220746f206e6f6e20455243373231526563656976657220696d706c656d656e7465724f776e61626c653a206e6577206f776e657220697320746865207a65726f20616464726573734e6f6465205075626c6963204b65792073686f756c6420626520656d707479206f7220363620636861726163746572734552433732313a207472616e7366657220746f20746865207a65726f2061646472657373546f6b656e732063616e206e6f206c6f6e676572206265207472616e73666572726564416464726573733a20696e73756666696369656e742062616c616e636520666f722063616c6c4552433732313a206f70657261746f7220717565727920666f72206e6f6e6578697374656e7420746f6b656e5468697320746f6b656e20686173206265656e206d696e74656420616c72656164794552433732313a20617070726f76652063616c6c6572206973206e6f74206f776e6572206e6f7220617070726f76656420666f7220616c6c4552433732313a2062616c616e636520717565727920666f7220746865207a65726f20616464726573734552433732313a206f776e657220717565727920666f72206e6f6e6578697374656e7420746f6b656e456e756d657261626c654d61703a20696e646578206f7574206f6620626f756e64734163636f756e7420416464726573732073686f756c6420626520656d707479206f7220363620636861726163746572734f6e6c7920416c7068614e756d657269637320616e642073706163657320616c6c6f77656420696e2067656e65736973206d6573736167654552433732313a20617070726f76656420717565727920666f72206e6f6e6578697374656e7420746f6b656e4552433732313a207472616e73666572206f6620746f6b656e2074686174206973206e6f74206f776e4552433732314d657461646174613a2055524920717565727920666f72206e6f6e6578697374656e7420746f6b656e4552433732313a20617070726f76616c20746f2063757272656e74206f776e657254686973206e6f64655075626c69634b65792068617320616c7265616479206120746f6b656e4e465473206d696e746564206279207468697320636f6e747261637420726570726573656e7420612047656e6573697320426c6f636b204163636f756e74206f662074686520446563424320626c6f636b636861696e2c20616e2065766f6c7574696f6e206f66205a6f6f42432e20466f72206d6f726520696e666f726d6174696f6e20676f20746f2068747470733a2f2f64656362632e636f6d4552433732313a207472616e736665722063616c6c6572206973206e6f74206f776e6572206e6f7220617070726f766564416464726573732073686f756c64206861766520275f2720696e20706f736974696f6e73205b332c2031322c2032312c2033302c2033392c2034382c2035375d2c206f7468657220636861727320412d5a206f7220322d3754686973206163636f756e74416464726573732068617320616c7265616479206120746f6b656ea2646970667358221220b97e71940b309345defd3d30f1e701d966ecf01b520421b6d52b4877f9c6ce0864736f6c634300060600334f776e61626c653a206e6577206f776e657220697320746865207a65726f20616464726573738be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0

Deployed Bytecode

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

Block Transaction Difficulty Gas Used Reward
View All Blocks Produced

Block Uncle Number Difficulty Gas Used Reward
View All Uncles
Loading...
Loading
Loading...
Loading

Validator Index Block Amount
View All Withdrawals

Txn Hash Block Value Eth2 PubKey Valid
View All Deposits
[ Download: CSV Export  ]

A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.