Token

Ocean Certificate (OC)

ERC-721

Overview

Max Total Supply

38 OC

Holders

Market

Volume (24H)

N/A

Min Price (24H)

N/A

Max Price (24H)

N/A

Other Info

Token Contract

0xc6bc8053dd92e4814099c7c28c7035aa636d0ba1

Filtered by Token Holder

0x4318cC449b1cbE6d64dd82E16abE58C79E076C2B

r33pich33p.eth

Balance

1 OC

0x4318cC449b1cbE6d64dd82E16abE58C79E076C2B

Click here to update the token information / general information

#	Exchange	Pair	Price	24H Volume	% Volume

Contract Source Code Verified (Exact Match)

Contract Name:

Certificate

Compiler Version

v0.6.2+commit.bacdbe57

Optimization Enabled:

Yes with 300 runs

Other Settings:

default evmVersion, MIT license

Contract Source Code (Solidity)

IDE

/**
 *Submitted for verification at Etherscan.io on 2021-10-23
*/

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

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

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


pragma solidity >=0.6.0 <0.8.0;

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

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


pragma solidity >=0.6.2 <0.8.0;


/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
      * @dev Safely transfers `tokenId` token from `from` to `to`.
      *
      * Requirements:
      *
      * - `from` cannot be the zero address.
      * - `to` cannot be the zero address.
      * - `tokenId` token must exist and be owned by `from`.
      * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
      * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
      *
      * Emits a {Transfer} event.
      */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Metadata.sol


pragma solidity >=0.6.2 <0.8.0;


/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {

    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Enumerable.sol


pragma solidity >=0.6.2 <0.8.0;


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

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

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

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

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


pragma solidity >=0.6.0 <0.8.0;

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

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


pragma solidity >=0.6.0 <0.8.0;


/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
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;
    }
}

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


pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, 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;
    }
}

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


pragma solidity >=0.6.2 <0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

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

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

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

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

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

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

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

            bytes32 lastvalue = set._values[lastIndex];

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

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

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

            return true;
        } else {
            return false;
        }
    }

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

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

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

    // 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));
    }
}

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


pragma solidity >=0.6.0 <0.8.0;

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

    struct MapEntry {
        bytes32 _key;
        bytes32 _value;
    }

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

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

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

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

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

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

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

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

            MapEntry storage lastEntry = map._entries[lastIndex];

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

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

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

            return true;
        } else {
            return false;
        }
    }

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

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

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

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

    /**
     * @dev 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))));
    }
}

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


pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    /**
     * @dev Converts a `uint256` to its ASCII `string` representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        uint256 index = digits - 1;
        temp = value;
        while (temp != 0) {
            buffer[index--] = bytes1(uint8(48 + temp % 10));
            temp /= 10;
        }
        return string(buffer);
    }
}

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


pragma solidity >=0.6.0 <0.8.0;












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

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

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

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

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

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

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

    // Base URI
    string private _baseURI;

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

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _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 { }
}

// File: contracts/Certificate.sol

pragma solidity ^0.6.0;


contract Certificate is ERC721 {
    constructor() public ERC721('Ocean Certificate', 'OC') {}

    function mintUniqueTokenTo(
        address _to,
        uint256 _tokenId,
        string memory _tokenURI
    ) public {
        super._mint(_to, _tokenId);
        super._setTokenURI(_tokenId, _tokenURI);
    }
}

Contract Security Audit

No Contract Security Audit Submitted- Submit Audit Here

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":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"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":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"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":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"string","name":"_tokenURI","type":"string"}],"name":"mintUniqueTokenTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","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":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","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"}]

Contract Creation Code

Decompile Bytecode Switch to Opcodes View

60806040523480156200001157600080fd5b5060408051808201825260118152704f6365616e20436572746966696361746560781b602080830191909152825180840190935260028352614f4360f01b90830152906200006f6301ffc9a760e01b6001600160e01b03620000f416565b81516200008490600690602085019062000179565b5080516200009a90600790602084019062000179565b50620000b66380ac58cd60e01b6001600160e01b03620000f416565b620000d1635b5e139f60e01b6001600160e01b03620000f416565b620000ec63780e9d6360e01b6001600160e01b03620000f416565b50506200021e565b6001600160e01b0319808216141562000154576040805162461bcd60e51b815260206004820152601c60248201527f4552433136353a20696e76616c696420696e7465726661636520696400000000604482015290519081900360640190fd5b6001600160e01b0319166000908152602081905260409020805460ff19166001179055565b828054600181600116156101000203166002900490600052602060002090601f016020900481019282601f10620001bc57805160ff1916838001178555620001ec565b82800160010185558215620001ec579182015b82811115620001ec578251825591602001919060010190620001cf565b50620001fa929150620001fe565b5090565b6200021b91905b80821115620001fa576000815560010162000205565b90565b611d07806200022e6000396000f3fe608060405234801561001057600080fd5b50600436106101165760003560e01c80634f6ccce7116100a257806395d89b411161007157806395d89b411461040f578063a22cb46514610417578063b88d4fde14610445578063c87b56dd1461050b578063e985e9c51461052857610116565b80634f6ccce7146103a75780636352211e146103c45780636c0360eb146103e157806370a08231146103e957610116565b806318160ddd116100e957806318160ddd1461023a57806323b872dd1461025457806326dd860a1461028a5780632f745c591461034557806342842e0e1461037157610116565b806301ffc9a71461011b57806306fdde0314610156578063081812fc146101d3578063095ea7b31461020c575b600080fd5b6101426004803603602081101561013157600080fd5b50356001600160e01b031916610556565b604080519115158252519081900360200190f35b61015e610579565b6040805160208082528351818301528351919283929083019185019080838360005b83811015610198578181015183820152602001610180565b50505050905090810190601f1680156101c55780820380516001836020036101000a031916815260200191505b509250505060405180910390f35b6101f0600480360360208110156101e957600080fd5b5035610610565b604080516001600160a01b039092168252519081900360200190f35b6102386004803603604081101561022257600080fd5b506001600160a01b038135169060200135610672565b005b61024261074d565b60408051918252519081900360200190f35b6102386004803603606081101561026a57600080fd5b506001600160a01b0381358116916020810135909116906040013561075e565b610238600480360360608110156102a057600080fd5b6001600160a01b03823516916020810135918101906060810160408201356401000000008111156102d057600080fd5b8201836020820111156102e257600080fd5b8035906020019184600183028401116401000000008311171561030457600080fd5b91908080601f0160208091040260200160405190810160405280939291908181526020018383808284376000920191909152509295506107b5945050505050565b6102426004803603604081101561035b57600080fd5b506001600160a01b0381351690602001356107c9565b6102386004803603606081101561038757600080fd5b506001600160a01b038135811691602081013590911690604001356107fa565b610242600480360360208110156103bd57600080fd5b5035610815565b6101f0600480360360208110156103da57600080fd5b5035610831565b61015e61085f565b610242600480360360208110156103ff57600080fd5b50356001600160a01b03166108c0565b61015e610928565b6102386004803603604081101561042d57600080fd5b506001600160a01b0381351690602001351515610989565b6102386004803603608081101561045b57600080fd5b6001600160a01b0382358116926020810135909116916040820135919081019060808101606082013564010000000081111561049657600080fd5b8201836020820111156104a857600080fd5b803590602001918460018302840111640100000000831117156104ca57600080fd5b91908080601f016020809104026020016040519081016040528093929190818152602001838380828437600092019190915250929550610a8e945050505050565b61015e6004803603602081101561052157600080fd5b5035610aec565b6101426004803603604081101561053e57600080fd5b506001600160a01b0381358116916020013516610d6f565b6001600160e01b0319811660009081526020819052604090205460ff165b919050565b60068054604080516020601f60026000196101006001881615020190951694909404938401819004810282018101909252828152606093909290918301828280156106055780601f106105da57610100808354040283529160200191610605565b820191906000526020600020905b8154815290600101906020018083116105e857829003601f168201915b505050505090505b90565b600061061b82610d9d565b6106565760405162461bcd60e51b815260040180806020018281038252602c815260200180611bd0602c913960400191505060405180910390fd5b506000908152600460205260409020546001600160a01b031690565b600061067d82610831565b9050806001600160a01b0316836001600160a01b031614156106d05760405162461bcd60e51b8152600401808060200182810382526021815260200180611c806021913960400191505060405180910390fd5b806001600160a01b03166106e2610db0565b6001600160a01b031614806107035750610703816106fe610db0565b610d6f565b61073e5760405162461bcd60e51b8152600401808060200182810382526038815260200180611b236038913960400191505060405180910390fd5b6107488383610db4565b505050565b60006107596002610e2f565b905090565b61076f610769610db0565b82610e3a565b6107aa5760405162461bcd60e51b8152600401808060200182810382526031815260200180611ca16031913960400191505060405180910390fd5b610748838383610ede565b6107bf838361103c565b6107488282611176565b6001600160a01b03821660009081526001602052604081206107f1908363ffffffff6111d916565b90505b92915050565b61074883838360405180602001604052806000815250610a8e565b60008061082960028463ffffffff6111e516565b509392505050565b60006107f482604051806060016040528060298152602001611b85602991396002919063ffffffff61120116565b60098054604080516020601f60026000196101006001881615020190951694909404938401819004810282018101909252828152606093909290918301828280156106055780601f106105da57610100808354040283529160200191610605565b60006001600160a01b0382166109075760405162461bcd60e51b815260040180806020018281038252602a815260200180611b5b602a913960400191505060405180910390fd5b6001600160a01b03821660009081526001602052604090206107f490610e2f565b60078054604080516020601f60026000196101006001881615020190951694909404938401819004810282018101909252828152606093909290918301828280156106055780601f106105da57610100808354040283529160200191610605565b610991610db0565b6001600160a01b0316826001600160a01b031614156109f7576040805162461bcd60e51b815260206004820152601960248201527f4552433732313a20617070726f766520746f2063616c6c657200000000000000604482015290519081900360640190fd5b8060056000610a04610db0565b6001600160a01b03908116825260208083019390935260409182016000908120918716808252919093529120805460ff191692151592909217909155610a48610db0565b60408051841515815290516001600160a01b0392909216917f17307eab39ab6107e8899845ad3d59bd9653f200f220920489ca2b5937696c319181900360200190a35050565b610a9f610a99610db0565b83610e3a565b610ada5760405162461bcd60e51b8152600401808060200182810382526031815260200180611ca16031913960400191505060405180910390fd5b610ae684848484611218565b50505050565b6060610af782610d9d565b610b325760405162461bcd60e51b815260040180806020018281038252602f815260200180611c51602f913960400191505060405180910390fd5b60008281526008602090815260409182902080548351601f6002600019610100600186161502019093169290920491820184900484028101840190945280845260609392830182828015610bc75780601f10610b9c57610100808354040283529160200191610bc7565b820191906000526020600020905b815481529060010190602001808311610baa57829003601f168201915b505050505090506060610bd861085f565b9050805160001415610bec57509050610574565b815115610cad5780826040516020018083805190602001908083835b60208310610c275780518252601f199092019160209182019101610c08565b51815160209384036101000a600019018019909216911617905285519190930192850191508083835b60208310610c6f5780518252601f199092019160209182019101610c50565b6001836020036101000a0380198251168184511680821785525050505050509050019250505060405160208183030381529060405292505050610574565b80610cb78561126a565b6040516020018083805190602001908083835b60208310610ce95780518252601f199092019160209182019101610cca565b51815160209384036101000a600019018019909216911617905285519190930192850191508083835b60208310610d315780518252601f199092019160209182019101610d12565b6001836020036101000a0380198251168184511680821785525050505050509050019250505060405160208183030381529060405292505050919050565b6001600160a01b03918216600090815260056020908152604080832093909416825291909152205460ff1690565b60006107f460028363ffffffff61132e16565b3390565b6000818152600460205260409020805473ffffffffffffffffffffffffffffffffffffffff19166001600160a01b0384169081179091558190610df682610831565b6001600160a01b03167f8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b92560405160405180910390a45050565b60006107f48261133a565b6000610e4582610d9d565b610e805760405162461bcd60e51b815260040180806020018281038252602c815260200180611af7602c913960400191505060405180910390fd5b6000610e8b83610831565b9050806001600160a01b0316846001600160a01b03161480610ec65750836001600160a01b0316610ebb84610610565b6001600160a01b0316145b80610ed65750610ed68185610d6f565b949350505050565b826001600160a01b0316610ef182610831565b6001600160a01b031614610f365760405162461bcd60e51b8152600401808060200182810382526029815260200180611c286029913960400191505060405180910390fd5b6001600160a01b038216610f7b5760405162461bcd60e51b8152600401808060200182810382526024815260200180611ad36024913960400191505060405180910390fd5b610f86838383610748565b610f91600082610db4565b6001600160a01b0383166000908152600160205260409020610fb9908263ffffffff61133e16565b506001600160a01b0382166000908152600160205260409020610fe2908263ffffffff61134a16565b50610ff56002828463ffffffff61135616565b5080826001600160a01b0316846001600160a01b03167fddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef60405160405180910390a4505050565b6001600160a01b038216611097576040805162461bcd60e51b815260206004820181905260248201527f4552433732313a206d696e7420746f20746865207a65726f2061646472657373604482015290519081900360640190fd5b6110a081610d9d565b156110f2576040805162461bcd60e51b815260206004820152601c60248201527f4552433732313a20746f6b656e20616c7265616479206d696e74656400000000604482015290519081900360640190fd5b6110fe60008383610748565b6001600160a01b0382166000908152600160205260409020611126908263ffffffff61134a16565b506111396002828463ffffffff61135616565b5060405181906001600160a01b038416906000907fddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef908290a45050565b61117f82610d9d565b6111ba5760405162461bcd60e51b815260040180806020018281038252602c815260200180611bfc602c913960400191505060405180910390fd5b60008281526008602090815260409091208251610748928401906119e6565b60006107f1838361136c565b60008080806111f486866113d0565b9097909650945050505050565b600061120e84848461144b565b90505b9392505050565b611223848484610ede565b61122f84848484611515565b610ae65760405162461bcd60e51b8152600401808060200182810382526032815260200180611aa16032913960400191505060405180910390fd5b60608161128f57506040805180820190915260018152600360fc1b6020820152610574565b8160005b81156112a757600101600a82049150611293565b6060816040519080825280601f01601f1916602001820160405280156112d4576020820181803883390190505b50859350905060001982015b831561132557600a840660300160f81b8282806001900393508151811061130357fe5b60200101906001600160f81b031916908160001a905350600a840493506112e0565b50949350505050565b60006107f18383611695565b5490565b60006107f183836116ad565b60006107f18383611773565b600061120e84846001600160a01b0385166117bd565b815460009082106113ae5760405162461bcd60e51b8152600401808060200182810382526022815260200180611a7f6022913960400191505060405180910390fd5b8260000182815481106113bd57fe5b9060005260206000200154905092915050565b8154600090819083106114145760405162461bcd60e51b8152600401808060200182810382526022815260200180611bae6022913960400191505060405180910390fd5b600084600001848154811061142557fe5b906000526020600020906002020190508060000154816001015492509250509250929050565b600082815260018401602052604081205482816114e65760405162461bcd60e51b81526004018080602001828103825283818151815260200191508051906020019080838360005b838110156114ab578181015183820152602001611493565b50505050905090810190601f1680156114d85780820380516001836020036101000a031916815260200191505b509250505060405180910390fd5b508460000160018203815481106114f957fe5b9060005260206000209060020201600101549150509392505050565b6000611529846001600160a01b0316611854565b61153557506001610ed6565b606061165b630a85bd0160e11b61154a610db0565b88878760405160240180856001600160a01b03166001600160a01b03168152602001846001600160a01b03166001600160a01b0316815260200183815260200180602001828103825283818151815260200191508051906020019080838360005b838110156115c35781810151838201526020016115ab565b50505050905090810190601f1680156115f05780820380516001836020036101000a031916815260200191505b5095505050505050604051602081830303815290604052906001600160e01b0319166020820180516001600160e01b038381831617835250505050604051806060016040528060328152602001611aa1603291396001600160a01b038816919063ffffffff61185a16565b9050600081806020019051602081101561167457600080fd5b50516001600160e01b031916630a85bd0160e11b1492505050949350505050565b60009081526001919091016020526040902054151590565b6000818152600183016020526040812054801561176957835460001980830191908101906000908790839081106116e057fe5b90600052602060002001549050808760000184815481106116fd57fe5b60009182526020808320909101929092558281526001898101909252604090209084019055865487908061172d57fe5b600190038181906000526020600020016000905590558660010160008781526020019081526020016000206000905560019450505050506107f4565b60009150506107f4565b600061177f8383611695565b6117b5575081546001818101845560008481526020808220909301849055845484825282860190935260409020919091556107f4565b5060006107f4565b600082815260018401602052604081205480611822575050604080518082018252838152602080820184815286546001818101895560008981528481209551600290930290950191825591519082015586548684528188019092529290912055611211565b8285600001600183038154811061183557fe5b9060005260206000209060020201600101819055506000915050611211565b3b151590565b606061120e84846000858561186e85611854565b6118bf576040805162461bcd60e51b815260206004820152601d60248201527f416464726573733a2063616c6c20746f206e6f6e2d636f6e7472616374000000604482015290519081900360640190fd5b60006060866001600160a01b031685876040518082805190602001908083835b602083106118fe5780518252601f1990920191602091820191016118df565b6001836020036101000a03801982511681845116808217855250505050505090500191505060006040518083038185875af1925050503d8060008114611960576040519150601f19603f3d011682016040523d82523d6000602084013e611965565b606091505b5091509150611975828286611980565b979650505050505050565b6060831561198f575081611211565b82511561199f5782518084602001fd5b60405162461bcd60e51b81526020600482018181528451602484015284518593919283926044019190850190808383600083156114ab578181015183820152602001611493565b828054600181600116156101000203166002900490600052602060002090601f016020900481019282601f10611a2757805160ff1916838001178555611a54565b82800160010185558215611a54579182015b82811115611a54578251825591602001919060010190611a39565b50611a60929150611a64565b5090565b61060d91905b80821115611a605760008155600101611a6a56fe456e756d657261626c655365743a20696e646578206f7574206f6620626f756e64734552433732313a207472616e7366657220746f206e6f6e20455243373231526563656976657220696d706c656d656e7465724552433732313a207472616e7366657220746f20746865207a65726f20616464726573734552433732313a206f70657261746f7220717565727920666f72206e6f6e6578697374656e7420746f6b656e4552433732313a20617070726f76652063616c6c6572206973206e6f74206f776e6572206e6f7220617070726f76656420666f7220616c6c4552433732313a2062616c616e636520717565727920666f7220746865207a65726f20616464726573734552433732313a206f776e657220717565727920666f72206e6f6e6578697374656e7420746f6b656e456e756d657261626c654d61703a20696e646578206f7574206f6620626f756e64734552433732313a20617070726f76656420717565727920666f72206e6f6e6578697374656e7420746f6b656e4552433732314d657461646174613a2055524920736574206f66206e6f6e6578697374656e7420746f6b656e4552433732313a207472616e73666572206f6620746f6b656e2074686174206973206e6f74206f776e4552433732314d657461646174613a2055524920717565727920666f72206e6f6e6578697374656e7420746f6b656e4552433732313a20617070726f76616c20746f2063757272656e74206f776e65724552433732313a207472616e736665722063616c6c6572206973206e6f74206f776e6572206e6f7220617070726f766564a2646970667358221220bccf015bb6d80dac4b28ed4f4421b53cffddcf2a3fcb712fd8c2b276fd86ae3864736f6c63430006020033

Deployed Bytecode

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

Deployed Bytecode Sourcemap

64531:325:0:-:0;;;;8:9:-1;5:2;;;30:1;27;20:12;5:2;64531:325:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;10223:150;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;-1:-1;10223:150:0;-1:-1:-1;;;;;;10223:150:0;;:::i;:::-;;;;;;;;;;;;;;;;;;51515:100;;;:::i;:::-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;8::-1;33:3;30:1;27:10;8:100;;;90:11;;;84:18;71:11;;;64:39;52:2;45:10;8:100;;;12:14;51515:100:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;54301:221;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;-1:-1;54301:221:0;;:::i;:::-;;;;-1:-1:-1;;;;;54301:221:0;;;;;;;;;;;;;;53831:404;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;-1:-1;;;;;;53831:404:0;;;;;;;;:::i;:::-;;53309:211;;;:::i;:::-;;;;;;;;;;;;;;;;55191:305;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;-1:-1;;;;;;55191:305:0;;;;;;;;;;;;;;;;;:::i;64634:219::-;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;-1:-1;;;;;64634:219:0;;;;;;;;;;;;;;;;;;;21:11:-1;5:28;;2:2;;;46:1;43;36:12;2:2;64634:219:0;;35:9:-1;28:4;12:14;8:25;5:40;2:2;;;58:1;55;48:12;2:2;64634:219:0;;;;;;100:9:-1;95:1;81:12;77:20;67:8;63:35;60:50;39:11;25:12;22:29;11:107;8:2;;;131:1;128;121:12;8:2;64634:219:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;30:3:-1;22:6;14;1:33;99:1;81:16;;74:27;;;;-1:-1;64634:219:0;;-1:-1:-1;64634:219:0;;-1:-1:-1;;;;;64634:219:0:i;53071:162::-;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;-1:-1;;;;;;53071:162:0;;;;;;;;:::i;55567:151::-;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;-1:-1;;;;;;55567:151:0;;;;;;;;;;;;;;;;;:::i;53597:172::-;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;-1:-1;53597:172:0;;:::i;51271:177::-;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;-1:-1;51271:177:0;;:::i;52890:97::-;;;:::i;50988:221::-;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;-1:-1;50988:221:0;-1:-1:-1;;;;;50988:221:0;;:::i;51684:104::-;;;:::i;54594:295::-;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;-1:-1;;;;;;54594:295:0;;;;;;;;;;:::i;55789:285::-;;;;;;13:3:-1;8;5:12;2:2;;;30:1;27;20:12;2:2;-1:-1;;;;;55789:285:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;21:11:-1;5:28;;2:2;;;46:1;43;36:12;2:2;55789:285:0;;35:9:-1;28:4;12:14;8:25;5:40;2:2;;;58:1;55;48:12;2:2;55789:285:0;;;;;;100:9:-1;95:1;81:12;77:20;67:8;63:35;60:50;39:11;25:12;22:29;11:107;8:2;;;131:1;128;121:12;8:2;55789:285:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;30:3:-1;22:6;14;1:33;99:1;81:16;;74:27;;;;-1:-1;55789:285:0;;-1:-1:-1;55789:285:0;;-1:-1:-1;;;;;55789:285:0:i;51859:792::-;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;-1:-1;51859:792:0;;:::i;54960:164::-;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;-1:-1;;;;;;54960:164:0;;;;;;;;;;:::i;10223:150::-;-1:-1:-1;;;;;;10332:33:0;;10308:4;10332:33;;;;;;;;;;;;;10223:150;;;;:::o;51515:100::-;51602:5;51595:12;;;;;;;;-1:-1:-1;;51595:12:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;51569:13;;51595:12;;51602:5;;51595:12;;51602:5;51595:12;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;51515:100;;:::o;54301:221::-;54377:7;54405:16;54413:7;54405;:16::i;:::-;54397:73;;;;-1:-1:-1;;;54397:73:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;-1:-1:-1;54490:24:0;;;;:15;:24;;;;;;-1:-1:-1;;;;;54490:24:0;;54301:221::o;53831:404::-;53912:13;53928:23;53943:7;53928:14;:23::i;:::-;53912:39;;53976:5;-1:-1:-1;;;;;53970:11:0;:2;-1:-1:-1;;;;;53970:11:0;;;53962:57;;;;-1:-1:-1;;;53962:57:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;54056:5;-1:-1:-1;;;;;54040:21:0;:12;:10;:12::i;:::-;-1:-1:-1;;;;;54040:21:0;;:69;;;;54065:44;54089:5;54096:12;:10;:12::i;:::-;54065:23;:44::i;:::-;54032:161;;;;-1:-1:-1;;;54032:161:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;54206:21;54215:2;54219:7;54206:8;:21::i;:::-;53831:404;;;:::o;53309:211::-;53370:7;53491:21;:12;:19;:21::i;:::-;53484:28;;53309:211;:::o;55191:305::-;55352:41;55371:12;:10;:12::i;:::-;55385:7;55352:18;:41::i;:::-;55344:103;;;;-1:-1:-1;;;55344:103:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;55460:28;55470:4;55476:2;55480:7;55460:9;:28::i;64634:219::-;64769:26;64781:3;64786:8;64769:11;:26::i;:::-;64806:39;64825:8;64835:9;64806:18;:39::i;53071:162::-;-1:-1:-1;;;;;53195:20:0;;53168:7;53195:20;;;:13;:20;;;;;:30;;53219:5;53195:30;:23;:30;:::i;:::-;53188:37;;53071:162;;;;;:::o;55567:151::-;55671:39;55688:4;55694:2;55698:7;55671:39;;;;;;;;;;;;:16;:39::i;53597:172::-;53672:7;;53714:22;:12;53730:5;53714:22;:15;:22;:::i;:::-;-1:-1:-1;53692:44:0;53597:172;-1:-1:-1;;;53597:172:0:o;51271:177::-;51343:7;51370:70;51387:7;51370:70;;;;;;;;;;;;;;;;;:12;;:70;;:16;:70;:::i;52890:97::-;52971:8;52964:15;;;;;;;;-1:-1:-1;;52964:15:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;52938:13;;52964:15;;52971:8;;52964:15;;52971:8;52964:15;;;;;;;;;;;;;;;;;;;;;;;;50988:221;51060:7;-1:-1:-1;;;;;51088:19:0;;51080:74;;;;-1:-1:-1;;;51080:74:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;-1:-1:-1;;;;;51172:20:0;;;;;;:13;:20;;;;;:29;;:27;:29::i;51684:104::-;51773:7;51766:14;;;;;;;;-1:-1:-1;;51766:14:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;51740:13;;51766:14;;51773:7;;51766:14;;51773:7;51766:14;;;;;;;;;;;;;;;;;;;;;;;;54594:295;54709:12;:10;:12::i;:::-;-1:-1:-1;;;;;54697:24:0;:8;-1:-1:-1;;;;;54697:24:0;;;54689:62;;;;;-1:-1:-1;;;54689:62:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;54809:8;54764:18;:32;54783:12;:10;:12::i;:::-;-1:-1:-1;;;;;54764:32:0;;;;;;;;;;;;;;;;;-1:-1:-1;54764:32:0;;;:42;;;;;;;;;;;;:53;;-1:-1:-1;;54764:53:0;;;;;;;;;;;54848:12;:10;:12::i;:::-;54833:48;;;;;;;;;;-1:-1:-1;;;;;54833:48:0;;;;;;;;;;;;;;54594:295;;:::o;55789:285::-;55921:41;55940:12;:10;:12::i;:::-;55954:7;55921:18;:41::i;:::-;55913:103;;;;-1:-1:-1;;;55913:103:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;56027:39;56041:4;56047:2;56051:7;56060:5;56027:13;:39::i;:::-;55789:285;;;;:::o;51859:792::-;51932:13;51966:16;51974:7;51966;:16::i;:::-;51958:76;;;;-1:-1:-1;;;51958:76:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;52073:19;;;;:10;:19;;;;;;;;;52047:45;;;;;;-1:-1:-1;;52047:45:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;:23;;:45;;;52073:19;52047:45;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;52103:18;52124:9;:7;:9::i;:::-;52103:30;;52215:4;52209:18;52231:1;52209:23;52205:72;;;-1:-1:-1;52256:9:0;-1:-1:-1;52249:16:0;;52205:72;52381:23;;:27;52377:108;;52456:4;52462:9;52439:33;;;;;;;;;;;;;;;36:153:-1;66:2;61:3;58:11;36:153;;176:10;;164:23;;-1:-1;;139:12;;;;98:2;89:12;;;;114;36:153;;;299:10;344;;263:2;259:12;;;254:3;250:22;-1:-1;;246:30;311:9;;295:26;;;340:21;;377:20;365:33;;52439::0;;;;;;;;;;-1:-1:-1;52439:33:0;;;36:153:-1;66:2;61:3;58:11;36:153;;176:10;;164:23;;-1:-1;;139:12;;;;98:2;89:12;;;;114;36:153;;;274:1;267:3;263:2;259:12;254:3;250:22;246:30;315:4;311:9;305:3;299:10;295:26;356:4;350:3;344:10;340:21;389:7;380;377:20;372:3;365:33;3:399;;;52439:33:0;;;;;;;;;;;;49:4:-1;39:7;30;26:21;22:32;13:7;6:49;52439:33:0;;;52425:48;;;;;;52377:108;52617:4;52623:18;:7;:16;:18::i;:::-;52600:42;;;;;;;;;;;;;;;36:153:-1;66:2;61:3;58:11;36:153;;176:10;;164:23;;-1:-1;;139:12;;;;98:2;89:12;;;;114;36:153;;;299:10;344;;263:2;259:12;;;254:3;250:22;-1:-1;;246:30;311:9;;295:26;;;340:21;;377:20;365:33;;52600:42:0;;;;;;;;;;-1:-1:-1;52600:42:0;;;36:153:-1;66:2;61:3;58:11;36:153;;176:10;;164:23;;-1:-1;;139:12;;;;98:2;89:12;;;;114;36:153;;;274:1;267:3;263:2;259:12;254:3;250:22;246:30;315:4;311:9;305:3;299:10;295:26;356:4;350:3;344:10;340:21;389:7;380;377:20;372:3;365:33;3:399;;;52600:42:0;;;;;;;;;;;;49:4:-1;39:7;30;26:21;22:32;13:7;6:49;52600:42:0;;;52586:57;;;;51859:792;;;:::o;54960:164::-;-1:-1:-1;;;;;55081:25:0;;;55057:4;55081:25;;;:18;:25;;;;;;;;:35;;;;;;;;;;;;;;;54960:164::o;57541:127::-;57606:4;57630:30;:12;57652:7;57630:30;:21;:30;:::i;667:106::-;755:10;667:106;:::o;63559:192::-;63634:24;;;;:15;:24;;;;;:29;;-1:-1:-1;;63634:29:0;-1:-1:-1;;;;;63634:29:0;;;;;;;;:24;;63688:23;63634:24;63688:14;:23::i;:::-;-1:-1:-1;;;;;63679:46:0;;;;;;;;;;;63559:192;;:::o;44258:123::-;44327:7;44354:19;44362:3;44354:7;:19::i;57835:355::-;57928:4;57953:16;57961:7;57953;:16::i;:::-;57945:73;;;;-1:-1:-1;;;57945:73:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;58029:13;58045:23;58060:7;58045:14;:23::i;:::-;58029:39;;58098:5;-1:-1:-1;;;;;58087:16:0;:7;-1:-1:-1;;;;;58087:16:0;;:51;;;;58131:7;-1:-1:-1;;;;;58107:31:0;:20;58119:7;58107:11;:20::i;:::-;-1:-1:-1;;;;;58107:31:0;;58087:51;:94;;;;58142:39;58166:5;58173:7;58142:23;:39::i;:::-;58079:103;57835:355;-1:-1:-1;;;;57835:355:0:o;60971:599::-;61096:4;-1:-1:-1;;;;;61069:31:0;:23;61084:7;61069:14;:23::i;:::-;-1:-1:-1;;;;;61069:31:0;;61061:85;;;;-1:-1:-1;;;61061:85:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;-1:-1:-1;;;;;61183:16:0;;61175:65;;;;-1:-1:-1;;;61175:65:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;61253:39;61274:4;61280:2;61284:7;61253:20;:39::i;:::-;61357:29;61374:1;61378:7;61357:8;:29::i;:::-;-1:-1:-1;;;;;61399:19:0;;;;;;:13;:19;;;;;:35;;61426:7;61399:35;:26;:35;:::i;:::-;-1:-1:-1;;;;;;61445:17:0;;;;;;:13;:17;;;;;:30;;61467:7;61445:30;:21;:30;:::i;:::-;-1:-1:-1;61488:29:0;:12;61505:7;61514:2;61488:29;:16;:29;:::i;:::-;;61554:7;61550:2;-1:-1:-1;;;;;61535:27:0;61544:4;-1:-1:-1;;;;;61535:27:0;;;;;;;;;;;60971:599;;;:::o;59456:404::-;-1:-1:-1;;;;;59536:16:0;;59528:61;;;;;-1:-1:-1;;;59528:61:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;59609:16;59617:7;59609;:16::i;:::-;59608:17;59600:58;;;;;-1:-1:-1;;;59600:58:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;59671:45;59700:1;59704:2;59708:7;59671:20;:45::i;:::-;-1:-1:-1;;;;;59729:17:0;;;;;;:13;:17;;;;;:30;;59751:7;59729:30;:21;:30;:::i;:::-;-1:-1:-1;59772:29:0;:12;59789:7;59798:2;59772:29;:16;:29;:::i;:::-;-1:-1:-1;59819:33:0;;59844:7;;-1:-1:-1;;;;;59819:33:0;;;59836:1;;59819:33;;59836:1;;59819:33;59456:404;;:::o;61726:215::-;61826:16;61834:7;61826;:16::i;:::-;61818:73;;;;-1:-1:-1;;;61818:73:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;61902:19;;;;:10;:19;;;;;;;;:31;;;;;;;;:::i;36051:137::-;36122:7;36157:22;36161:3;36173:5;36157:3;:22::i;44720:236::-;44800:7;;;;44860:22;44864:3;44876:5;44860:3;:22::i;:::-;44829:53;;;;-1:-1:-1;44720:236:0;-1:-1:-1;;;;;44720:236:0:o;46006:213::-;46113:7;46164:44;46169:3;46189;46195:12;46164:4;:44::i;:::-;46156:53;-1:-1:-1;46006:213:0;;;;;;:::o;56956:272::-;57070:28;57080:4;57086:2;57090:7;57070:9;:28::i;:::-;57117:48;57140:4;57146:2;57150:7;57159:5;57117:22;:48::i;:::-;57109:111;;;;-1:-1:-1;;;57109:111:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;46468:746;46524:13;46745:10;46741:53;;-1:-1:-1;46772:10:0;;;;;;;;;;;;-1:-1:-1;;;46772:10:0;;;;;;46741:53;46819:5;46804:12;46860:78;46867:9;;46860:78;;46893:8;;46924:2;46916:10;;;;46860:78;;;46948:19;46980:6;46970:17;;;;;;;;;;;;;;;;;;;;;;;;;21:6:-1;;104:10;46970:17:0;87:34:-1;135:17;;-1:-1;46970:17:0;-1:-1:-1;47042:5:0;;-1:-1:-1;46948:39:0;-1:-1:-1;;;47014:10:0;;47058:117;47065:9;;47058:117;;47134:2;47127:4;:9;47122:2;:14;47109:29;;47091:6;47098:7;;;;;;;47091:15;;;;;;;;;;;:47;-1:-1:-1;;;;;47091:47:0;;;;;;;;-1:-1:-1;47161:2:0;47153:10;;;;47058:117;;;-1:-1:-1;47199:6:0;46468:746;-1:-1:-1;;;;46468:746:0:o;44019:151::-;44103:4;44127:35;44137:3;44157;44127:9;:35::i;40837:110::-;40920:19;;40837:110::o;35138:137::-;35208:4;35232:35;35240:3;35260:5;35232:7;:35::i;34831:131::-;34898:4;34922:32;34927:3;34947:5;34922:4;:32::i;43442:185::-;43531:4;43555:64;43560:3;43580;-1:-1:-1;;;;;43594:23:0;;43555:4;:64::i;31089:204::-;31184:18;;31156:7;;31184:26;-1:-1:-1;31176:73:0;;;;-1:-1:-1;;;31176:73:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;31267:3;:11;;31279:5;31267:18;;;;;;;;;;;;;;;;31260:25;;31089:204;;;;:::o;41302:279::-;41406:19;;41369:7;;;;41406:27;-1:-1:-1;41398:74:0;;;;-1:-1:-1;;;41398:74:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;41485:22;41510:3;:12;;41523:5;41510:19;;;;;;;;;;;;;;;;;;41485:44;;41548:5;:10;;;41560:5;:12;;;41540:33;;;;;41302:279;;;;;:::o;42799:319::-;42893:7;42932:17;;;:12;;;:17;;;;;;42983:12;42968:13;42960:36;;;;-1:-1:-1;;;42960:36:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;23:1:-1;8:100;33:3;30:1;27:10;8:100;;;90:11;;;84:18;71:11;;;64:39;52:2;45:10;8:100;;;12:14;42960:36:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;43050:3;:12;;43074:1;43063:8;:12;43050:26;;;;;;;;;;;;;;;;;;:33;;;43043:40;;;42799:319;;;;;:::o;62836:604::-;62957:4;62984:15;:2;-1:-1:-1;;;;;62984:13:0;;:15::i;:::-;62979:60;;-1:-1:-1;63023:4:0;63016:11;;62979:60;63049:23;63075:252;-1:-1:-1;;;63188:12:0;:10;:12::i;:::-;63215:4;63234:7;63256:5;63091:181;;;;;;-1:-1:-1;;;;;63091:181:0;-1:-1:-1;;;;;63091:181:0;;;;;;-1:-1:-1;;;;;63091:181:0;-1:-1:-1;;;;;63091:181:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;23:1:-1;8:100;33:3;30:1;27:10;8:100;;;90:11;;;84:18;71:11;;;64:39;52:2;45:10;8:100;;;12:14;63091:181:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;49:4:-1;39:7;30;26:21;22:32;13:7;6:49;63091:181:0;;;;-1:-1:-1;;;;;63091:181:0;;38:4:-1;29:7;25:18;67:10;61:17;-1:-1;;;;;199:8;192:4;186;182:15;179:29;167:10;160:49;0:215;;;63091:181:0;63075:252;;;;;;;;;;;;;;;;;-1:-1:-1;;;;;63075:15:0;;;:252;;:15;:252;:::i;:::-;63049:278;;63338:13;63365:10;63354:32;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;-1:-1;63354:32:0;-1:-1:-1;;;;;;63405:26:0;-1:-1:-1;;;63405:26:0;;-1:-1:-1;;;62836:604:0;;;;;;:::o;40617:125::-;40688:4;40712:17;;;:12;;;;;:17;;;;;;:22;;;40617:125::o;28791:1544::-;28857:4;28996:19;;;:12;;;:19;;;;;;29032:15;;29028:1300;;29467:18;;-1:-1:-1;;29418:14:0;;;;29467:22;;;;29394:21;;29467:3;;:22;;29754;;;;;;;;;;;;;;29734:42;;29900:9;29871:3;:11;;29883:13;29871:26;;;;;;;;;;;;;;;;;;;:38;;;;29977:23;;;30019:1;29977:12;;;:23;;;;;;30003:17;;;29977:43;;30129:17;;29977:3;;30129:17;;;;;;;;;;;;;;;;;;;;;;30224:3;:12;;:19;30237:5;30224:19;;;;;;;;;;;30217:26;;;30267:4;30260:11;;;;;;;;29028:1300;30311:5;30304:12;;;;;28201:414;28264:4;28286:21;28296:3;28301:5;28286:9;:21::i;:::-;28281:327;;-1:-1:-1;27:10;;39:1;23:18;;;45:23;;28324:11:0;:23;;;;;;;;;;;;;28507:18;;28485:19;;;:12;;;:19;;;;;;:40;;;;28540:11;;28281:327;-1:-1:-1;28591:5:0;28584:12;;38117:692;38193:4;38328:17;;;:12;;;:17;;;;;;38362:13;38358:444;;-1:-1:-1;;38447:38:0;;;;;;;;;;;;;;;;;;27:10:-1;;39:1;23:18;;;45:23;;38429:12:0;:57;;;;;;;;;;;;;;;;;;;;;;;;38644:19;;38624:17;;;:12;;;:17;;;;;;;:39;38678:11;;38358:444;38758:5;38722:3;:12;;38746:1;38735:8;:12;38722:26;;;;;;;;;;;;;;;;;;:33;;:41;;;;38785:5;38778:12;;;;;19222:422;19589:20;19628:8;;;19222:422::o;22140:195::-;22243:12;22275:52;22297:6;22305:4;22311:1;22314:12;22243;23444:18;23455:6;23444:10;:18::i;:::-;23436:60;;;;;-1:-1:-1;;;23436:60:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;23570:12;23584:23;23611:6;-1:-1:-1;;;;;23611:11:0;23631:5;23639:4;23611:33;;;;;;;;;;;;;36:153:-1;66:2;61:3;58:11;36:153;;176:10;;164:23;;-1:-1;;139:12;;;;98:2;89:12;;;;114;36:153;;;274:1;267:3;263:2;259:12;254:3;250:22;246:30;315:4;311:9;305:3;299:10;295:26;356:4;350:3;344:10;340:21;389:7;380;377:20;372:3;365:33;3:399;;;23611:33:0;;;;;;;;;;;;;;;;;;;;;;;;;12:1:-1;19;14:27;;;;67:4;61:11;56:16;;134:4;130:9;123:4;105:16;101:27;97:43;94:1;90:51;84:4;77:65;157:16;154:1;147:27;211:16;208:1;201:4;198:1;194:12;179:49;5:228;;14:27;32:4;27:9;;5:228;;23569:75:0;;;;23662:52;23680:7;23689:10;23701:12;23662:17;:52::i;:::-;23655:59;23192:530;-1:-1:-1;;;;;;;23192:530:0:o;25732:742::-;25847:12;25876:7;25872:595;;;-1:-1:-1;25907:10:0;25900:17;;25872:595;26021:17;;:21;26017:439;;26284:10;26278:17;26345:15;26332:10;26328:2;26324:19;26317:44;26232:148;26420:20;;-1:-1:-1;;;26420:20:0;;;;;;;;;;;;;;;;;26427:12;;26420:20;;;;;;;;;;;;;;;27:10:-1;;8:100;;90:11;;;84:18;71:11;;;64:39;52:2;45:10;8:100;;64531:325:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;-1:-1:-1;64531:325:0;;;-1:-1:-1;64531:325:0;:::i;:::-;;;:::o;:::-;;;;;;;;;;;;;;;;;

Swarm Source

ipfs://bccf015bb6d80dac4b28ed4f4421b53cffddcf2a3fcb712fd8c2b276fd86ae38

A token is a representation of an on-chain or off-chain asset. The token page shows information such as price, total supply, holders, transfers and social links. Learn more about this page in our Knowledge Base.

Tools & Services