Contract 0x8EA78686Fb00ef2C2C6Ea8A1BF555E3de6b52A08 8

 
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0x148a30a3796540da0759f8f6f8a9bae77ed21b370fca055a0dc44b994cf52766Withdraw All1055381532023-06-13 16:51:23106 days 21 hrs ago0x429f42fb5247e3a34d88d978b7491d4b2bee6105 IN  0x8ea78686fb00ef2c2c6ea8a1bf555e3de6b52a080 ETH0.0000275586580.000000632
0xdaf34119df3ed38dd15fd082a977b25ee8d4768897331646465e9e57abe3ee1cSet Renderer73120352022-05-07 19:43:36508 days 19 hrs ago0x429f42fb5247e3a34d88d978b7491d4b2bee6105 IN  0x8ea78686fb00ef2c2c6ea8a1bf555e3de6b52a080 ETH0.0000971902620.001
0xb60a7aa4541e30927055cbff75de9b1bec4c7133603a4a9be8889909e016c297Mint71747342022-05-06 2:39:23510 days 12 hrs ago0x1e79b045dc29eae9fdc69673c9dcd7c53e5e159d IN  0x8ea78686fb00ef2c2c6ea8a1bf555e3de6b52a080.05 ETH0.0001665490920.001
0xd3df6ffda68ad1d7a109985fb7a2c359deea11288ffdfcb350aab47456fc9f65Withdraw All71737252022-05-06 2:11:57510 days 12 hrs ago0x429f42fb5247e3a34d88d978b7491d4b2bee6105 IN  0x8ea78686fb00ef2c2c6ea8a1bf555e3de6b52a080 ETH0.0001498125240.001
0xd22d07191e83974a185fba627344e7072813ffa3299b4ec2dbe765cfc05826dcMint71736092022-05-06 2:08:27510 days 12 hrs ago0x429f42fb5247e3a34d88d978b7491d4b2bee6105 IN  0x8ea78686fb00ef2c2c6ea8a1bf555e3de6b52a080.05 ETH0.0001561813830.001
0xbcd364af67f3806d265a59d759b5ac59b47bed8073a3d4a456ab59323d483fe7Set Renderer71735152022-05-06 2:05:12510 days 12 hrs ago0x429f42fb5247e3a34d88d978b7491d4b2bee6105 IN  0x8ea78686fb00ef2c2c6ea8a1bf555e3de6b52a080 ETH0.0001148584260.001
0x2f6bfddfe24597de74d77a4e7362c5376c4b303946e45898aaec347d060d81af0x6080604071734902022-05-06 2:04:41510 days 12 hrs ago0x429f42fb5247e3a34d88d978b7491d4b2bee6105 IN  Create: Eeethers0 ETH0.0041533535990.001
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0x148a30a3796540da0759f8f6f8a9bae77ed21b370fca055a0dc44b994cf527661055381532023-06-13 16:51:23106 days 21 hrs ago 0x8ea78686fb00ef2c2c6ea8a1bf555e3de6b52a080x429f42fb5247e3a34d88d978b7491d4b2bee61050.05 ETH
0xd3df6ffda68ad1d7a109985fb7a2c359deea11288ffdfcb350aab47456fc9f6571737252022-05-06 2:11:57510 days 12 hrs ago 0x8ea78686fb00ef2c2c6ea8a1bf555e3de6b52a080x429f42fb5247e3a34d88d978b7491d4b2bee61050.05 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
Eeethers

Compiler Version
v0.8.13+commit.abaa5c0e

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, Unlicense license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Optimistic.Etherscan.io on 2022-05-06
*/

//SPDX-License-Identifier: Unlicense

// File: @openzeppelin/contracts/utils/Base64.sol


// OpenZeppelin Contracts (last updated v4.5.0) (utils/Base64.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides a set of functions to operate with Base64 strings.
 *
 * _Available since v4.5._
 */
library Base64 {
    /**
     * @dev Base64 Encoding/Decoding Table
     */
    string internal constant _TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    /**
     * @dev Converts a `bytes` to its Bytes64 `string` representation.
     */
    function encode(bytes memory data) internal pure returns (string memory) {
        /**
         * Inspired by Brecht Devos (Brechtpd) implementation - MIT licence
         * https://github.com/Brechtpd/base64/blob/e78d9fd951e7b0977ddca77d92dc85183770daf4/base64.sol
         */
        if (data.length == 0) return "";

        // Loads the table into memory
        string memory table = _TABLE;

        // Encoding takes 3 bytes chunks of binary data from `bytes` data parameter
        // and split into 4 numbers of 6 bits.
        // The final Base64 length should be `bytes` data length multiplied by 4/3 rounded up
        // - `data.length + 2`  -> Round up
        // - `/ 3`              -> Number of 3-bytes chunks
        // - `4 *`              -> 4 characters for each chunk
        string memory result = new string(4 * ((data.length + 2) / 3));

        assembly {
            // Prepare the lookup table (skip the first "length" byte)
            let tablePtr := add(table, 1)

            // Prepare result pointer, jump over length
            let resultPtr := add(result, 32)

            // Run over the input, 3 bytes at a time
            for {
                let dataPtr := data
                let endPtr := add(data, mload(data))
            } lt(dataPtr, endPtr) {

            } {
                // Advance 3 bytes
                dataPtr := add(dataPtr, 3)
                let input := mload(dataPtr)

                // To write each character, shift the 3 bytes (18 bits) chunk
                // 4 times in blocks of 6 bits for each character (18, 12, 6, 0)
                // and apply logical AND with 0x3F which is the number of
                // the previous character in the ASCII table prior to the Base64 Table
                // The result is then added to the table to get the character to write,
                // and finally write it in the result pointer but with a left shift
                // of 256 (1 byte) - 8 (1 ASCII char) = 248 bits

                mstore8(resultPtr, mload(add(tablePtr, and(shr(18, input), 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance

                mstore8(resultPtr, mload(add(tablePtr, and(shr(12, input), 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance

                mstore8(resultPtr, mload(add(tablePtr, and(shr(6, input), 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance

                mstore8(resultPtr, mload(add(tablePtr, and(input, 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance
            }

            // When data `bytes` is not exactly 3 bytes long
            // it is padded with `=` characters at the end
            switch mod(mload(data), 3)
            case 1 {
                mstore8(sub(resultPtr, 1), 0x3d)
                mstore8(sub(resultPtr, 2), 0x3d)
            }
            case 2 {
                mstore8(sub(resultPtr, 1), 0x3d)
            }
        }

        return result;
    }
}

// File: Utils.sol

pragma solidity ^0.8.12;

// Core utils used extensively to format CSS and numbers.
library utils {
  // used to simulate empty strings
  string internal constant NULL = '';

  // formats a CSS variable line. includes a semicolon for formatting.
  function setCssVar(string memory _key, string memory _val)
    internal
    pure
    returns (string memory)
  {
    return string.concat('--', _key, ':', _val, ';');
  }

  // formats getting a css variable
  function getCssVar(string memory _key) internal pure returns (string memory) {
    return string.concat('var(--', _key, ')');
  }

  // formats getting a def URL
  function getDefURL(string memory _id) internal pure returns (string memory) {
    return string.concat('url(#', _id, ')');
  }

  // formats rgba white with a specified opacity / alpha
  function white_a(uint256 _a) internal pure returns (string memory) {
    return rgba(255, 255, 255, _a);
  }

  // formats rgba black with a specified opacity / alpha
  function black_a(uint256 _a) internal pure returns (string memory) {
    return rgba(0, 0, 0, _a);
  }

  // formats generic rgba color in css
  function rgba(
    uint256 _r,
    uint256 _g,
    uint256 _b,
    uint256 _a
  ) internal pure returns (string memory) {
    string memory formattedA = _a < 100
      ? string.concat('0.', utils.uint2str(_a))
      : '1';
    return
      string.concat(
        'rgba(',
        utils.uint2str(_r),
        ',',
        utils.uint2str(_g),
        ',',
        utils.uint2str(_b),
        ',',
        formattedA,
        ')'
      );
  }

  // checks if two strings are equal
  function stringsEqual(string memory _a, string memory _b)
    internal
    pure
    returns (bool)
  {
    return keccak256(abi.encodePacked(_a)) == keccak256(abi.encodePacked(_b));
  }

  // returns the length of a string in characters
  function utfStringLength(string memory _str)
    internal
    pure
    returns (uint256 length)
  {
    uint256 i = 0;
    bytes memory string_rep = bytes(_str);

    while (i < string_rep.length) {
      if (string_rep[i] >> 7 == 0) i += 1;
      else if (string_rep[i] >> 5 == bytes1(uint8(0x6))) i += 2;
      else if (string_rep[i] >> 4 == bytes1(uint8(0xE))) i += 3;
      else if (string_rep[i] >> 3 == bytes1(uint8(0x1E)))
        i += 4;
        //For safety
      else i += 1;

      length++;
    }
  }

  // converts an unsigned integer to a string
  function uint2str(uint256 _i)
    internal
    pure
    returns (string memory _uintAsString)
  {
    if (_i == 0) {
      return '0';
    }
    uint256 j = _i;
    uint256 len;
    while (j != 0) {
      len++;
      j /= 10;
    }
    bytes memory bstr = new bytes(len);
    uint256 k = len;
    while (_i != 0) {
      k = k - 1;
      uint8 temp = (48 + uint8(_i - (_i / 10) * 10));
      bytes1 b1 = bytes1(temp);
      bstr[k] = b1;
      _i /= 10;
    }
    return string(bstr);
  }

  function getSlice(
    uint256 begin,
    uint256 end,
    string memory text
  ) internal pure returns (string memory) {
    bytes memory a = new bytes(end - begin + 1);
    for (uint256 i = 0; i <= end - begin; i++) {
      a[i] = bytes(text)[i + begin - 1];
    }
    return string(a);
  }
}

// File: SVG.sol

pragma solidity ^0.8.12;


// Core SVG utilitiy library which helps us construct
// onchain SVG's with a simple, web-like API.
library svg {
  /* MAIN ELEMENTS */
  function g(string memory _props, string memory _children)
    internal
    pure
    returns (string memory)
  {
    return el('g', _props, _children);
  }

  function path(string memory _props, string memory _children)
    internal
    pure
    returns (string memory)
  {
    return el('path', _props, _children);
  }

  function text(string memory _props, string memory _children)
    internal
    pure
    returns (string memory)
  {
    return el('text', _props, _children);
  }

  function line(string memory _props, string memory _children)
    internal
    pure
    returns (string memory)
  {
    return el('line', _props, _children);
  }

  function circle(string memory _props, string memory _children)
    internal
    pure
    returns (string memory)
  {
    return el('circle', _props, _children);
  }

  function circle(string memory _props) internal pure returns (string memory) {
    return el('circle', _props);
  }

  function rect(string memory _props, string memory _children)
    internal
    pure
    returns (string memory)
  {
    return el('rect', _props, _children);
  }

  function rect(string memory _props) internal pure returns (string memory) {
    return el('rect', _props);
  }

  function filter(string memory _props, string memory _children)
    internal
    pure
    returns (string memory)
  {
    return el('filter', _props, _children);
  }

  function cdata(string memory _content) internal pure returns (string memory) {
    return string.concat('<![CDATA[', _content, ']]>');
  }

  /* GRADIENTS */
  function radialGradient(string memory _props, string memory _children)
    internal
    pure
    returns (string memory)
  {
    return el('radialGradient', _props, _children);
  }

  function linearGradient(string memory _props, string memory _children)
    internal
    pure
    returns (string memory)
  {
    return el('linearGradient', _props, _children);
  }

  function gradientStop(
    uint256 offset,
    string memory stopColor,
    string memory _props
  ) internal pure returns (string memory) {
    return
      el(
        'stop',
        string.concat(
          prop('stop-color', stopColor),
          ' ',
          prop('offset', string.concat(utils.uint2str(offset), '%')),
          ' ',
          _props
        )
      );
  }

  function animateTransform(string memory _props)
    internal
    pure
    returns (string memory)
  {
    return el('animateTransform', _props);
  }

  function image(string memory _href, string memory _props)
    internal
    pure
    returns (string memory)
  {
    return el('image', string.concat(prop('href', _href), ' ', _props));
  }

  /* COMMON */
  // A generic element, can be used to construct any SVG (or HTML) element
  function el(
    string memory _tag,
    string memory _props,
    string memory _children
  ) internal pure returns (string memory) {
    return
      string.concat('<', _tag, ' ', _props, '>', _children, '</', _tag, '>');
  }

  // A generic element, can be used to construct any SVG (or HTML) element without children
  function el(string memory _tag, string memory _props)
    internal
    pure
    returns (string memory)
  {
    return string.concat('<', _tag, ' ', _props, '/>');
  }

  // an SVG attribute
  function prop(string memory _key, string memory _val)
    internal
    pure
    returns (string memory)
  {
    return string.concat(_key, '=', '"', _val, '" ');
  }
}

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


// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

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

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

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// File: Renderer.sol

pragma solidity ^0.8.11;





contract Renderer {
  function render(uint256 _tokenId, string memory _a) public pure returns (string memory) {

    string[7] memory colors = [
      string.concat('ff', utils.getSlice(3, 6, _a)),
      utils.getSlice(7, 12, _a),
      utils.getSlice(13, 18, _a),
      utils.getSlice(19, 24, _a),
      utils.getSlice(25, 30, _a),
      utils.getSlice(31, 36, _a),
      utils.getSlice(37, 42, _a)
    ];

    string memory image = _render(_tokenId, colors);

    return
      string.concat(
        'data:application/json;base64,',
        Base64.encode(
          bytes(
            getEeethersJSON(
              name(_tokenId),
              // image data
              Base64.encode(bytes(image)),
              attributes(colors, _tokenId)
            )
          )
        )
      );
  }

  function _render(uint256 _tokenId, string[7] memory colors)
    internal
    pure
    returns (string memory)
  {
    return
      string.concat(
        '<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewBox="0 0 1000 1000" style="background: #F2F3F5;">',
        svg.el(
          'filter',
          string.concat(svg.prop('id', 'filter')),
          string.concat(
            svg.el(
              'feTurbulence',
              string.concat(
                svg.prop('type', 'fractalNoise'),
                svg.prop('baseFrequency', '0.01'),
                svg.prop('numOctaves', '3'),
                svg.prop('seed', utils.uint2str(_tokenId))
              )
            ),
            svg.el(
              'feDisplacementMap',
              string.concat(
                svg.prop('in', 'SourceGraphic'),
                svg.prop('yChannelSelector', 'R'),
                svg.prop('scale', '99')
              )
            )
          )
        ),
        svg.g(
          string.concat(
            svg.prop('filter', 'url(#filter)'),
            svg.prop('fill', 'none'),
            svg.prop('stroke', string.concat('#ff', colors[0])),
            svg.prop('stroke-width', '140%'),
            svg.prop('stroke-dasharray', '99')
          ),
          dashArray(colors)
        ),
        '</svg>'
      );
  }

  function dashArray(string[7] memory colors)
    internal
    pure
    returns (string memory)
  {
    return
      string.concat(
        svg.circle(
          string.concat(
            svg.prop('id', 'c'),
            svg.prop('cx', '50%'),
            svg.prop('cy', '50%'),
            svg.prop('r', '70%'),
            svg.prop('style', 'transform-origin: center')
          ),
          svg.animateTransform(
            string.concat(
              svg.prop('attributeName', 'transform'),
              svg.prop('attributeType', 'XML'),
              svg.prop('type', 'rotate'),
              svg.prop('from', '0 0 0'),
              svg.prop('to', '360 0 0'),
              svg.prop('dur', '120s'),
              svg.prop('repeatCount', 'indefinite')
            )
          )
        ),
        string.concat(
          svg.el(
            'use',
            string.concat(
              svg.prop('href', '#c'),
              svg.prop('stroke', string.concat('#', colors[1])),
              svg.prop('stroke-dasharray', '99 60')
            )
          ),
          svg.el(
            'use',
            string.concat(
              svg.prop('href', '#c'),
              svg.prop('stroke', string.concat('#', colors[2])),
              svg.prop('stroke-dasharray', '99 120')
            )
          ),
          svg.el(
            'use',
            string.concat(
              svg.prop('href', '#c'),
              svg.prop('stroke', string.concat('#', colors[3])),
              svg.prop('stroke-dasharray', '99 180')
            )
          ),
          svg.el(
            'use',
            string.concat(
              svg.prop('href', '#c'),
              svg.prop('stroke', string.concat('#', colors[4])),
              svg.prop('stroke-dasharray', '99 240')
            )
          ),
          svg.el(
            'use',
            string.concat(
              svg.prop('href', '#c'),
              svg.prop('stroke', string.concat('#', colors[5])),
              svg.prop('stroke-dasharray', '99 300')
            )
          ),
          svg.el(
            'use',
            string.concat(
              svg.prop('href', '#c'),
              svg.prop('stroke', string.concat('#', colors[6])),
              svg.prop('stroke-dasharray', '99 360')
            )
          )
        )
      );
  }

  function attributes(string[7] memory colors, uint256 _tokenId)
    internal
    pure
    returns (string memory)
  {
    return
      string.concat(
        attributeString('Base Color', '#F2F3F5'),
        ',',
        attributeString('Color 1', string.concat('#ff', colors[0])),
        ',',
        attributeString('Color 2', string.concat('#', colors[1])),
        ',',
        attributeString('Color 3', string.concat('#', colors[2])),
        ',',
        attributeString('Color 4', string.concat('#', colors[3])),
        ',',
        attributeString('Color 5', string.concat('#', colors[4])),
        ',',
        attributeString('Color 6', string.concat('#', colors[5])),
        ',',
        attributeString('Color 7', string.concat('#', colors[6])),
        ',',
        attributeString('Seed', utils.uint2str(_tokenId))
      );
  }

  function name(uint256 _tokenId) internal pure returns (string memory) {
    return string.concat('Eeethers #', utils.uint2str(_tokenId + 1));
  }

  // Convenience functions for formatting all the metadata related to a particular NFT

  function getEeethersJSON(
    string memory _name,
    string memory _imageData,
    string memory _attributes
  ) internal pure returns (string memory) {
    return
      string.concat(
        '{"name": "',
        _name,
        '", "image": "data:image/svg+xml;base64,',
        _imageData,
        '","decription": "Exploring Ethereums endless spectrum of colors."',
        ',"attributes":[',
        _attributes,
        ']}'
      );
  }

  function attributeString(string memory _name, string memory _value)
    internal
    pure
    returns (string memory)
  {
    return
      string.concat(
        '{',
        kv('trait_type', string.concat('"', _name, '"')),
        ',',
        kv('value', string.concat('"', _value, '"')),
        '}'
      );
  }

  function kv(string memory _key, string memory _value)
    internal
    pure
    returns (string memory)
  {
    return string.concat('"', _key, '"', ':', _value);
  }
}

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


// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^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 meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

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

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

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

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

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


// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^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 `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

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


// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^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/utils/introspection/ERC165.sol


// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;


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

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


// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721.sol)

pragma solidity ^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`.
     *
     * 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;

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

    /**
     * @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);
}

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


// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^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/ERC721.sol


// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;








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

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overridden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

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

        _approve(to, tokenId);
    }

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

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

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

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

        _transfer(from, to, tokenId);
    }

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

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

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

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

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

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

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

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);

        _afterTokenTransfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

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

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

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);

        _afterTokenTransfer(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 from incorrect 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);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

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


// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

// File: Eeethers.sol

pragma solidity ^0.8.0;





/*
           .-               .                      
   .;;;.`-'             ...;....;                  
  ;;  (_)   .-.  .-.     .'    ;;-.  .-.   .;.::.. 
  .;;; .-..;.-'.;.-'   .;     ;;  ;.;.-'   .;  .'; 
 ;;  .;  ; `:::'`:::'.;      .;`  ` `:::'.;' .' .' 
 `;.___.'                                   '      

 9999 max supply
 mint from contract 
*/

contract Eeethers is ERC721, Ownable {
  /// hello
  event Hello();

  function hello() internal {
    emit Hello();
  }

  //// ============ define variables ============
  mapping(uint256 => string) private tokenMetadata;

  uint256 public cost = 0.05 ether;
  uint256 public constant MAX_TOKENS = 9999;
  uint256 public tokenId;

  constructor() ERC721('Eeethers', 'ethrs') {
    hello();
  }

  /// ============ token functions ============

  event Mint(uint256 _tokenId);

  function mint() public payable {
    require(tokenId < MAX_TOKENS, 'No eeethers remaining');
    require(msg.value >= 0.05 ether, "Not enough ETH");
    _mint(msg.sender, tokenId);
    string memory _a = Strings.toHexString(uint256(uint160(msg.sender)));
    tokenMetadata[tokenId] = renderer.render(tokenId, _a );
    emit Mint(tokenId);
    tokenId++;
  }

  function tokenURI(uint256 _tokenId)
    public
    view
    override
    returns (string memory)
  {
    return tokenMetadata[_tokenId];
  }

  /* ADMIN */
  function withdrawAll() external onlyOwner {
    payable(owner()).transfer(address(this).balance);
  }

  function withdrawAllERC20(IERC20 _erc20Token) external onlyOwner {
    _erc20Token.transfer(owner(), _erc20Token.balanceOf(address(this)));
  }

  event MetadataUpdated(uint256 indexed tokenId);

  // Store renderer as separate contract so we can update it if needed
  Renderer public renderer;

  function setRenderer(Renderer _renderer) external onlyOwner {
    renderer = _renderer;
    emit MetadataUpdated(type(uint256).max);
  }
}

Contract Security Audit

Contract ABI

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Renderer","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract Renderer","name":"_renderer","type":"address"}],"name":"setRenderer","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":[],"name":"tokenId","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":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"_erc20Token","type":"address"}],"name":"withdrawAllERC20","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://c5addbcaa0f57843620bc65962dd5e3557e5c98fc59fe4a5332f58d8de98f3a5
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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