ETH Price: $3,749.84 (-0.58%)
Gas: 15 Gwei

Contract

0x0747118C9F44C7a23365b2476dCD05E03114C747
 

Overview

ETH Balance

0.04 ETH

Eth Value

$149.99 (@ $3,749.84/ETH)

Token Holdings

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Transaction Hash
Method
Block
From
To
Value
Set Approval For...198432532024-05-11 0:35:5911 days ago1715387759IN
Shields: SHIELDS Token
0 ETH0.000255785.54412001
Transfer From198354862024-05-09 22:32:1112 days ago1715293931IN
Shields: SHIELDS Token
0 ETH0.000217363.78729081
Set Approval For...198219482024-05-08 1:05:1114 days ago1715130311IN
Shields: SHIELDS Token
0 ETH0.000184373.99629305
Transfer From198211092024-05-07 22:16:2314 days ago1715120183IN
Shields: SHIELDS Token
0 ETH0.000193344.28890127
Transfer From198209002024-05-07 21:33:3514 days ago1715117615IN
Shields: SHIELDS Token
0 ETH0.000205144.55074828
Build197812382024-05-02 8:26:5920 days ago1714638419IN
Shields: SHIELDS Token
0 ETH0.001754067.30033148
Set Approval For...197606022024-04-29 11:14:1123 days ago1714389251IN
Shields: SHIELDS Token
0 ETH0.00042059.1145349
Set Approval For...196953022024-04-20 8:01:2332 days ago1713600083IN
Shields: SHIELDS Token
0 ETH0.000311666.75528262
Set Approval For...196949812024-04-20 6:56:4732 days ago1713596207IN
Shields: SHIELDS Token
0 ETH0.000412818.9478164
Set Approval For...196696092024-04-16 17:43:5935 days ago1713289439IN
Shields: SHIELDS Token
0 ETH0.0016794136.37298957
Build196275342024-04-10 20:11:5941 days ago1712779919IN
Shields: SHIELDS Token
0.02 ETH0.0041580119.31769819
Safe Transfer Fr...195936942024-04-06 2:26:1146 days ago1712370371IN
Shields: SHIELDS Token
0 ETH0.000631510.48355904
Build195712672024-04-02 23:06:3549 days ago1712099195IN
Shields: SHIELDS Token
0.02 ETH0.0060833826.94658471
Set Approval For...195620802024-04-01 16:10:4751 days ago1711987847IN
Shields: SHIELDS Token
0 ETH0.001083544.57401058
Set Approval For...195233242024-03-27 4:29:3556 days ago1711513775IN
Shields: SHIELDS Token
0 ETH0.0008747918.9612851
Set Approval For...195037112024-03-24 10:08:1159 days ago1711274891IN
Shields: SHIELDS Token
0 ETH0.0007196515.57029569
Set Approval For...195020782024-03-24 4:36:1159 days ago1711254971IN
Shields: SHIELDS Token
0 ETH0.0007443816.10519273
Set Approval For...195019862024-03-24 4:17:4759 days ago1711253867IN
Shields: SHIELDS Token
0 ETH0.0007111615.41449231
Set Approval For...194637372024-03-18 19:24:2364 days ago1710789863IN
Shields: SHIELDS Token
0 ETH0.0016963936.76950211
Set Approval For...194581002024-03-18 0:23:4765 days ago1710721427IN
Shields: SHIELDS Token
0 ETH0.0010737723.23190442
Collect Fees194157732024-03-12 1:38:4771 days ago1710207527IN
Shields: SHIELDS Token
0 ETH0.0014646148.00128698
Transfer From193948502024-03-09 3:26:4774 days ago1709954807IN
Shields: SHIELDS Token
0 ETH0.002961747.63117243
Set Approval For...193796622024-03-07 0:17:4776 days ago1709770667IN
Shields: SHIELDS Token
0 ETH0.0016147166.59147616
Build193352642024-02-29 19:30:2382 days ago1709235023IN
Shields: SHIELDS Token
0.08 ETH0.0156886958.97961717
Build193108812024-02-26 9:34:5986 days ago1708940099IN
Shields: SHIELDS Token
0 ETH0.0085614730.8776451
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194157732024-03-12 1:38:4771 days ago1710207527
Shields: SHIELDS Token
1.43 ETH
162166612022-12-19 5:30:23520 days ago1671427823
Shields: SHIELDS Token
1.2 ETH
156438912022-09-30 4:53:23600 days ago1664513603
Shields: SHIELDS Token
2.44 ETH
156046702022-09-24 17:19:47605 days ago1664039987
Shields: SHIELDS Token
5.63 ETH
150547342022-07-01 5:29:19691 days ago1656653359
Shields: SHIELDS Token
1.58 ETH
148893962022-06-02 6:20:13720 days ago1654150813
Shields: SHIELDS Token
1.8 ETH
146697182022-04-28 0:39:30755 days ago1651106370
Shields: SHIELDS Token
0.62 ETH
146425702022-04-23 18:05:55759 days ago1650737155
Shields: SHIELDS Token
1.27 ETH
145669632022-04-11 22:10:00771 days ago1649715000
Shields: SHIELDS Token
0.02 ETH
144708692022-03-27 22:14:46786 days ago1648419286
Shields: SHIELDS Token
4.78 ETH
142774472022-02-25 20:30:31816 days ago1645821031
Shields: SHIELDS Token
4.83 ETH
141231642022-02-01 23:39:30840 days ago1643758770
Shields: SHIELDS Token
17.63 ETH
141208042022-02-01 15:06:55841 days ago1643728015
Shields: SHIELDS Token
0.2 ETH
140964872022-01-28 21:06:17844 days ago1643403977
Shields: SHIELDS Token
14.51 ETH
140922402022-01-28 5:16:55845 days ago1643347015
Shields: SHIELDS Token
27.83 ETH
140891762022-01-27 17:56:13845 days ago1643306173
Shields: SHIELDS Token
20.69 ETH
140837902022-01-26 21:56:21846 days ago1643234181
Shields: SHIELDS Token
900 ETH
140827772022-01-26 18:04:50846 days ago1643220290
Shields: SHIELDS Token
0.2 ETH
140827042022-01-26 17:48:18846 days ago1643219298
Shields: SHIELDS Token
1 ETH
140827032022-01-26 17:48:02846 days ago1643219282
Shields: SHIELDS Token
1 ETH
140827032022-01-26 17:48:02846 days ago1643219282
Shields: SHIELDS Token
1 ETH
140826982022-01-26 17:47:07846 days ago1643219227
Shields: SHIELDS Token
1 ETH
140826872022-01-26 17:44:07846 days ago1643219047
Shields: SHIELDS Token
1 ETH
140826872022-01-26 17:44:07846 days ago1643219047
Shields: SHIELDS Token
1 ETH
140826872022-01-26 17:44:07846 days ago1643219047
Shields: SHIELDS Token
1 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
Shields

Compiler Version
v0.8.9+commit.e5eed63a

Optimization Enabled:
Yes with 1000000 runs

Other Settings:
default evmVersion
File 1 of 21 : Shields.sol
// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.9;

import './interfaces/ICategories.sol';
import './interfaces/IShields.sol';
import './interfaces/IEmblemWeaver.sol';
import '@openzeppelin/contracts/token/ERC721/ERC721.sol';
import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/utils/Strings.sol';

contract Shields is ERC721, IShields, Ownable {
    event ShieldBuilt(
        uint256 tokenId,
        uint16 field,
        uint16 hardware,
        uint16 frame,
        uint24[4] colors,
        ShieldBadge shieldBadge
    );

    IEmblemWeaver public immutable emblemWeaver;

    uint256 constant makerBadgeThreshold = 5;

    uint256 constant makerPremintThreshold = 100;
    uint256 constant granteePremintThreshold = 500;
    uint256 constant standardMintMax = 5000;
    uint256 constant individualMintMax = 5;

    uint256 constant makerReservedHardware = 120;

    uint256 public constant mythicFee = 0.02 ether;
    uint256 public constant specialFee = 0.08 ether;

    bool public publicMintActive = false;
    uint256 public publicMintPrice;

    uint256 internal _nextId;

    mapping(uint256 => Shield) private _shields;
    // transient variable that's immediately cleared after checking for duplicate colors
    mapping(uint24 => bool) private _checkDuplicateColors;
    // record shieldHashes so that duplicate shields cannot be built
    mapping(bytes32 => bool) public shieldHashes;


    modifier publicMintPriceSet() {
        require(publicMintPrice > 0, 'Shields: public mint price not yet set');
        _;
    }

    modifier publicMintIsActive() {
        require(publicMintActive, 'Shields: public mint not active yet');
        _;
    }

    modifier publicMintIsNotActive() {
        require(!publicMintActive, 'Shields: public mint is already active');
        _;
    }

    modifier validMintCount(uint8 count) {
        require(_nextId + count <= standardMintMax + 1, 'Shields: public mint max exceeded');
        require(count <= individualMintMax, 'Shields: can only mint up to 5 per transaction');
        _;
    }

    modifier publicMintPaid(uint8 count) {
        require(msg.value == publicMintPrice * count, 'Shields: invalid mint fee');
        _;
    }

    modifier onlyTokenOwner(uint256 tokenId) {
        require(msg.sender == ERC721.ownerOf(tokenId), 'Shields: only owner can build Shield');
        _;
    }

    modifier shieldNotBuilt(uint256 tokenId) {
        require(!_shields[tokenId].built, 'Shields: Shield already built');
        _;
    }

    modifier validHardware(uint256 tokenId, uint16 hardware) {
        if (hardware == makerReservedHardware) {
            require(tokenId <= makerBadgeThreshold, 'Shields: Three Shields hardware reserved for Maker Badge');
        }
        _;
    }

    modifier validColors(uint16 field, uint24[4] memory colors) {
        validateColors(colors, field);
        _;
    }

    constructor(
        string memory name_,
        string memory symbol_,
        IEmblemWeaver _emblemWeaver,
        address makerBadgeRecipient,
        address granteeBadgeRecipient
    ) ERC721(name_, symbol_) Ownable() {
        emblemWeaver = _emblemWeaver;

        for (uint256 i = 1; i <= makerPremintThreshold; i++) {
            _mint(makerBadgeRecipient, i);
        }

        for (uint256 j = makerPremintThreshold + 1; j <= granteePremintThreshold; j++) {
            _mint(granteeBadgeRecipient, j);
        }

        _nextId = granteePremintThreshold + 1;
    }

    // ============ OWNER INTERFACE ============

    function collectFees() external onlyOwner {
        (bool success, ) = payable(msg.sender).call{value: address(this).balance}(new bytes(0));
        require(success, 'Shields: ether transfer failed');
    }

    function setPublicMintActive() external onlyOwner publicMintPriceSet {
        publicMintActive = true;
    }

    function setPublicMintPrice(uint256 _publicMintPrice) external onlyOwner publicMintIsNotActive {
      publicMintPrice = _publicMintPrice;
    }

    // ============ PUBLIC INTERFACE ============

    function mint(address to, uint8 count)
        external
        payable
        publicMintIsActive
        validMintCount(count)
        publicMintPaid(count)
    {
        for (uint8 i = 0; i < count; i++) {
            _mint(to, _nextId++);
        }
    }

    function build(
        uint16 field,
        uint16 hardware,
        uint16 frame,
        uint24[4] memory colors,
        uint256 tokenId
    )
        external
        payable
        override
        onlyTokenOwner(tokenId)
        shieldNotBuilt(tokenId)
        validHardware(tokenId, hardware)
        validColors(field, colors)
    {
        // shield must be unique
        bytes32 shieldHash = keccak256(abi.encode(field, hardware, colors));
        require(!shieldHashes[shieldHash], 'Shields: unique Shield already built');
        shieldHashes[shieldHash] = true;

        // Construct Shield
        Shield memory shield = Shield({
            built: true,
            field: field,
            hardware: hardware,
            frame: frame,
            colors: colors,
            shieldBadge: calculateShieldBadge(tokenId)
        });
        _shields[tokenId] = shield;

        // Calculate Fee
        {
            uint256 fee;
            ICategories.FieldCategories fieldType = emblemWeaver
                .fieldGenerator()
                .generateField(shield.field, shield.colors)
                .fieldType;
            ICategories.HardwareCategories hardwareType = emblemWeaver
                .hardwareGenerator()
                .generateHardware(shield.hardware)
                .hardwareType;
            uint256 frameFee = emblemWeaver.frameGenerator().generateFrame(shield.frame).fee;
            if (fieldType == ICategories.FieldCategories.MYTHIC) {
                fee += mythicFee;
            }
            if (hardwareType == ICategories.HardwareCategories.SPECIAL) {
                fee += specialFee;
            }
            fee += frameFee;
            require(msg.value == fee, 'Shields: invalid building fee');
        }

        emit ShieldBuilt(tokenId, field, hardware, frame, colors, calculateShieldBadge(tokenId));
    }

    // ============ PUBLIC VIEW FUNCTIONS ============

    function totalSupply() public view returns (uint256) {
        return _nextId - 1;
    }

    function tokenURI(uint256 tokenId) public view override(ERC721) returns (string memory) {
        require(_exists(tokenId), 'Shields: URI query for nonexistent token');
        Shield memory shield = _shields[tokenId];

        if (!shield.built) {
            return emblemWeaver.generateShieldBadgeURI(calculateShieldBadge(tokenId));
        } else {
            return emblemWeaver.generateShieldURI(shield);
        }
    }

    function shields(uint256 tokenId)
        external
        view
        override
        returns (
            uint16 field,
            uint16 hardware,
            uint16 frame,
            uint24 color1,
            uint24 color2,
            uint24 color3,
            uint24 color4,
            ShieldBadge shieldBadge
        )
    {
        require(_exists(tokenId), 'Shield: tokenID does not exist');
        Shield memory shield = _shields[tokenId];
        return (
            shield.field,
            shield.hardware,
            shield.frame,
            shield.colors[0],
            shield.colors[1],
            shield.colors[2],
            shield.colors[3],
            shield.shieldBadge
        );
    }

    // ============ INTERNAL INTERFACE ============

    function calculateShieldBadge(uint256 tokenId) internal pure returns (ShieldBadge) {
        if (tokenId <= makerBadgeThreshold) {
            return ShieldBadge.MAKER;
        } else {
            return ShieldBadge.STANDARD;
        }
    }

    function validateColors(uint24[4] memory colors, uint16 field) internal {
        if (field == 0) {
            checkExistsDupsMax(colors, 1);
        } else if (field <= 242) {
            checkExistsDupsMax(colors, 2);
        } else if (field <= 293) {
            checkExistsDupsMax(colors, 3);
        } else {
            checkExistsDupsMax(colors, 4);
        }
    }

    function checkExistsDupsMax(uint24[4] memory colors, uint8 nColors) private {
        for (uint8 i = 0; i < nColors; i++) {
            require(_checkDuplicateColors[colors[i]] == false, 'Shields: all colors must be unique');
            require(emblemWeaver.fieldGenerator().colorExists(colors[i]), 'Shields: color does not exist');
            _checkDuplicateColors[colors[i]] = true;
        }
        for (uint8 i = 0; i < nColors; i++) {
            _checkDuplicateColors[colors[i]] = false;
        }
        for (uint8 i = nColors; i < 4; i++) {
            require(colors[i] == 0, 'Shields: max colors exceeded for field');
        }
    }
}

File 3 of 21 : ICategories.sol
// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.9;

interface ICategories {
    enum FieldCategories {
        MYTHIC,
        HERALDIC
    }

    enum HardwareCategories {
        STANDARD,
        SPECIAL
    }
}

File 4 of 21 : IShields.sol
// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.9;

import '@openzeppelin/contracts/token/ERC721/IERC721.sol';
import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/utils/Strings.sol';

/// @dev Build Customizable Shields for an NFT
interface IShields is IERC721 {
    enum ShieldBadge {
        MAKER,
        STANDARD
    }

    struct Shield {
        bool built;
        uint16 field;
        uint16 hardware;
        uint16 frame;
        ShieldBadge shieldBadge;
        uint24[4] colors;
    }

    function build(
        uint16 field,
        uint16 hardware,
        uint16 frame,
        uint24[4] memory colors,
        uint256 tokenId
    ) external payable;

    function shields(uint256 tokenId)
        external
        view
        returns (
            uint16 field,
            uint16 hardware,
            uint16 frame,
            uint24 color1,
            uint24 color2,
            uint24 color3,
            uint24 color4,
            ShieldBadge shieldBadge
        );
}

File 5 of 21 : IEmblemWeaver.sol
// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.9;

import './IShields.sol';
import './IFrameGenerator.sol';
import './IFieldGenerator.sol';
import './IHardwareGenerator.sol';

/// @dev Generate Customizable Shields
interface IEmblemWeaver {
    function fieldGenerator() external returns (IFieldGenerator);

    function hardwareGenerator() external returns (IHardwareGenerator);

    function frameGenerator() external returns (IFrameGenerator);

    function generateShieldURI(IShields.Shield memory shield) external view returns (string memory);

    function generateShieldBadgeURI(IShields.ShieldBadge shieldBadge) external view returns (string memory);
}

File 6 of 21 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

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

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _approve(to, tokenId);
    }

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

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _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 || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

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

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

        emit Transfer(from, to, tokenId);
    }

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

    /**
     * @dev 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 {}
}

File 7 of 21 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @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 8 of 21 : Strings.sol
// SPDX-License-Identifier: MIT
// 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 9 of 21 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

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

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

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

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

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

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

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

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

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

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

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

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

File 10 of 21 : IERC165.sol
// SPDX-License-Identifier: MIT
// 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 11 of 21 : Context.sol
// SPDX-License-Identifier: MIT
// 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 12 of 21 : IFrameGenerator.sol
// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.9;

import './IFrameSVGs.sol';

/// @dev Generate Frame SVG
interface IFrameGenerator {
    struct FrameSVGs {
        IFrameSVGs frameSVGs1;
        IFrameSVGs frameSVGs2;
    }

    /// @param Frame uint representing Frame selection
    /// @return FrameData containing svg snippet and Frame title and Frame type
    function generateFrame(uint16 Frame) external view returns (IFrameSVGs.FrameData memory);
}

File 13 of 21 : IFieldGenerator.sol
// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.9;

import './IFieldSVGs.sol';
import './IColors.sol';

/// @dev Generate Field SVG
interface IFieldGenerator {
    /// @param field uint representing field selection
    /// @param colors to be rendered in the field svg
    /// @return FieldData containing svg snippet and field title
    function generateField(uint16 field, uint24[4] memory colors) external view returns (IFieldSVGs.FieldData memory);

    event ColorAdded(uint24 color, string title);

    struct Color {
        string title;
        bool exists;
    }

    /// @notice Returns true if color exists in contract, else false.
    /// @param color 3-byte uint representing color
    /// @return true or false
    function colorExists(uint24 color) external view returns (bool);

    /// @notice Returns the title string corresponding to the 3-byte color
    /// @param color 3-byte uint representing color
    /// @return true or false
    function colorTitle(uint24 color) external view returns (string memory);

    struct FieldSVGs {
        IFieldSVGs fieldSVGs1;
        IFieldSVGs fieldSVGs2;
        IFieldSVGs fieldSVGs3;
        IFieldSVGs fieldSVGs4;
        IFieldSVGs fieldSVGs5;
        IFieldSVGs fieldSVGs6;
        IFieldSVGs fieldSVGs7;
        IFieldSVGs fieldSVGs8;
        IFieldSVGs fieldSVGs9;
        IFieldSVGs fieldSVGs10;
        IFieldSVGs fieldSVGs11;
        IFieldSVGs fieldSVGs12;
        IFieldSVGs fieldSVGs13;
        IFieldSVGs fieldSVGs14;
        IFieldSVGs fieldSVGs15;
        IFieldSVGs fieldSVGs16;
        IFieldSVGs fieldSVGs17;
        IFieldSVGs fieldSVGs18;
        IFieldSVGs fieldSVGs19;
        IFieldSVGs fieldSVGs20;
        IFieldSVGs fieldSVGs21;
        IFieldSVGs fieldSVGs22;
        IFieldSVGs fieldSVGs23;
        IFieldSVGs fieldSVGs24;
    }
}

File 14 of 21 : IHardwareGenerator.sol
// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.9;

import './IHardwareSVGs.sol';

/// @dev Generate Hardware SVG
interface IHardwareGenerator {

    /// @param hardware uint representing hardware selection
    /// @return HardwareData containing svg snippet and hardware title and hardware type
    function generateHardware(uint16 hardware) external view returns (IHardwareSVGs.HardwareData memory);

    struct HardwareSVGs {
        IHardwareSVGs hardwareSVGs1;
        IHardwareSVGs hardwareSVGs2;
        IHardwareSVGs hardwareSVGs3;
        IHardwareSVGs hardwareSVGs4;
        IHardwareSVGs hardwareSVGs5;
        IHardwareSVGs hardwareSVGs6;
        IHardwareSVGs hardwareSVGs7;
        IHardwareSVGs hardwareSVGs8;
        IHardwareSVGs hardwareSVGs9;
        IHardwareSVGs hardwareSVGs10;
        IHardwareSVGs hardwareSVGs11;
        IHardwareSVGs hardwareSVGs12;
        IHardwareSVGs hardwareSVGs13;
        IHardwareSVGs hardwareSVGs14;
        IHardwareSVGs hardwareSVGs15;
        IHardwareSVGs hardwareSVGs16;
        IHardwareSVGs hardwareSVGs17;
        IHardwareSVGs hardwareSVGs18;
        IHardwareSVGs hardwareSVGs19;
        IHardwareSVGs hardwareSVGs20;
        IHardwareSVGs hardwareSVGs21;
        IHardwareSVGs hardwareSVGs22;
        IHardwareSVGs hardwareSVGs23;
        IHardwareSVGs hardwareSVGs24;
        IHardwareSVGs hardwareSVGs25;
        IHardwareSVGs hardwareSVGs26;
        IHardwareSVGs hardwareSVGs27;
        IHardwareSVGs hardwareSVGs28;
        IHardwareSVGs hardwareSVGs29;
        IHardwareSVGs hardwareSVGs30;
        IHardwareSVGs hardwareSVGs31;
        IHardwareSVGs hardwareSVGs32;
        IHardwareSVGs hardwareSVGs33;
        IHardwareSVGs hardwareSVGs34;
        IHardwareSVGs hardwareSVGs35;
        IHardwareSVGs hardwareSVGs36;
        IHardwareSVGs hardwareSVGs37;
        IHardwareSVGs hardwareSVGs38;
    }
}

File 15 of 21 : IFrameSVGs.sol
// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.9;

interface IFrameSVGs {
    struct FrameData {
        string title;
        uint256 fee;
        string svgString;
    }
}

File 16 of 21 : IFieldSVGs.sol
// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.9;

import './ICategories.sol';

interface IFieldSVGs {
    struct FieldData {
        string title;
        ICategories.FieldCategories fieldType;
        string svgString;
    }
}

File 17 of 21 : IColors.sol
// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.9;

interface IColors {
    event ColorAdded(uint24 color, string title);

    struct Color {
        string title;
        bool exists;
    }

    /// @notice Returns true if color exists in contract, else false.
    /// @param color 3-byte uint representing color
    /// @return true or false
    function colorExists(uint24 color) external view returns (bool);

    /// @notice Returns the title string corresponding to the 3-byte color
    /// @param color 3-byte uint representing color
    /// @return true or false
    function colorTitle(uint24 color) external view returns (string memory);
}

File 18 of 21 : IHardwareSVGs.sol
// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.9;

import './ICategories.sol';

interface IHardwareSVGs {
    struct HardwareData {
        string title;
        ICategories.HardwareCategories hardwareType;
        string svgString;
    }
}

File 19 of 21 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

File 20 of 21 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

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

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

File 21 of 21 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)

pragma solidity ^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;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

File 22 of 21 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "metadata": {
    "bytecodeHash": "none"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"string","name":"name_","type":"string"},{"internalType":"string","name":"symbol_","type":"string"},{"internalType":"contract IEmblemWeaver","name":"_emblemWeaver","type":"address"},{"internalType":"address","name":"makerBadgeRecipient","type":"address"},{"internalType":"address","name":"granteeBadgeRecipient","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint16","name":"field","type":"uint16"},{"indexed":false,"internalType":"uint16","name":"hardware","type":"uint16"},{"indexed":false,"internalType":"uint16","name":"frame","type":"uint16"},{"indexed":false,"internalType":"uint24[4]","name":"colors","type":"uint24[4]"},{"indexed":false,"internalType":"enum IShields.ShieldBadge","name":"shieldBadge","type":"uint8"}],"name":"ShieldBuilt","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":[{"internalType":"uint16","name":"field","type":"uint16"},{"internalType":"uint16","name":"hardware","type":"uint16"},{"internalType":"uint16","name":"frame","type":"uint16"},{"internalType":"uint24[4]","name":"colors","type":"uint24[4]"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"build","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"collectFees","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"emblemWeaver","outputs":[{"internalType":"contract IEmblemWeaver","name":"","type":"address"}],"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":"uint8","name":"count","type":"uint8"}],"name":"mint","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"mythicFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"publicMintActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"publicMintPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"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":[],"name":"setPublicMintActive","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_publicMintPrice","type":"uint256"}],"name":"setPublicMintPrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"shieldHashes","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"shields","outputs":[{"internalType":"uint16","name":"field","type":"uint16"},{"internalType":"uint16","name":"hardware","type":"uint16"},{"internalType":"uint16","name":"frame","type":"uint16"},{"internalType":"uint24","name":"color1","type":"uint24"},{"internalType":"uint24","name":"color2","type":"uint24"},{"internalType":"uint24","name":"color3","type":"uint24"},{"internalType":"uint24","name":"color4","type":"uint24"},{"internalType":"enum IShields.ShieldBadge","name":"shieldBadge","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"specialFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","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":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

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

-----Decoded View---------------
Arg [0] : name_ (string): Shields
Arg [1] : symbol_ (string): SHIELDS
Arg [2] : _emblemWeaver (address): 0x3E2063199F7b98b8188B7649d95bd0C82f4B0001
Arg [3] : makerBadgeRecipient (address): 0x42aaEEe1201EC5D1f3a3DCcc23AB8c01391d182d
Arg [4] : granteeBadgeRecipient (address): 0x5e14ed9dCeE22ba758E8de482301028b261c4a14

-----Encoded View---------------
9 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [2] : 0000000000000000000000003e2063199f7b98b8188b7649d95bd0c82f4b0001
Arg [3] : 00000000000000000000000042aaeee1201ec5d1f3a3dccc23ab8c01391d182d
Arg [4] : 0000000000000000000000005e14ed9dcee22ba758e8de482301028b261c4a14
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [6] : 536869656c647300000000000000000000000000000000000000000000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [8] : 534849454c445300000000000000000000000000000000000000000000000000


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OVERVIEW

Shields is an on-chain heraldic design system developed by Area Technology. Each Shield is composed and built by the holder of a Shield Badge. All components are stored as SVG code on Ethereum. This project is released as CC0 under the public domain. Anyone may use Shields, or the individual elem...

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