NFT
Overview
TokenID
2456
Total Transfers
-
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract
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Contract Name:
Checks
Compiler Version
v0.8.17+commit.8df45f5f
Optimization Enabled:
No with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.17; import "./interfaces/IChecks.sol"; import "./interfaces/IChecksEdition.sol"; import "./libraries/ChecksArt.sol"; import "./libraries/ChecksMetadata.sol"; import "./libraries/Utilities.sol"; import "./standards/CHECKS721.sol"; /** ββββββββββββββββββββββββββββββββββββββββ ββββββββββββββββββββββββββββββββββββββββ βββββββββββββββββββ βββββββββββββββββββ βββββββββββββββ βββββββββββββββ βββββββββ βββββββββ ββββββββ ββββββββ ββββββββ ββ βββββββ βββββ βββ βββββ ββββ βββ ββββ βββββ ββ βββ βββββ βββββββ βββ βββββββ ββββββββ ββββββββ βββββββββ βββββββββ βββββββββββββββ βββββββββββββββ βββββββββββββββββββ βββββββββββββββββββ ββββββββββββββββββββββββββββββββββββββββ ββββββββββββββββββββββββββββββββββββββββ @title Checks @author VisualizeValue @notice This artwork is notable. */ contract Checks is IChecks, CHECKS721 { /// @notice The VV Checks Edition contract. IChecksEdition public editionChecks; /// @dev We use this database for persistent storage. Checks checks; /// @dev Initializes the Checks Originals contract and links the Edition contract. constructor() { editionChecks = IChecksEdition(0x34eEBEE6942d8Def3c125458D1a86e0A897fd6f9); checks.day0 = uint32(block.timestamp); checks.epoch = 1; } /// @notice Migrate Checks Editions to Checks Originals by burning the Editions. /// Requires the Approval of this contract on the Edition contract. /// @param tokenIds The Edition token IDs you want to migrate. /// @param recipient The address to receive the tokens. function mint(uint256[] calldata tokenIds, address recipient) external { uint256 count = tokenIds.length; // Initialize new epoch / resolve previous epoch. resolveEpochIfNecessary(); // Burn the Editions for the given tokenIds & mint the Originals. for (uint256 i; i < count;) { uint256 id = tokenIds[i]; address owner = editionChecks.ownerOf(id); // Check whether we're allowed to migrate this Edition. if ( owner != msg.sender && (! editionChecks.isApprovedForAll(owner, msg.sender)) && editionChecks.getApproved(id) != msg.sender ) { revert NotAllowed(); } // Burn the Edition. editionChecks.burn(id); // Initialize our Check. StoredCheck storage check = checks.all[id]; check.day = Utilities.day(checks.day0, block.timestamp); check.epoch = uint32(checks.epoch); check.seed = uint16(id); check.divisorIndex = 0; // Mint the original. // If we're minting to a vault, transfer it there. if (msg.sender != recipient) { _safeMintVia(recipient, msg.sender, id); } else { _safeMint(msg.sender, id); } unchecked { ++i; } } // Keep track of how many checks have been minted. unchecked { checks.minted += uint32(count); } } /// @notice Get a specific check with its genome settings. /// @param tokenId The token ID to fetch. function getCheck(uint256 tokenId) external view returns (Check memory check) { return ChecksArt.getCheck(tokenId, checks); } /// @notice Sacrifice a token to transfer its visual representation to another token. /// @param tokenId The token ID transfer the art into. /// @param burnId The token ID to sacrifice. function inItForTheArt(uint256 tokenId, uint256 burnId) external { _sacrifice(tokenId, burnId); unchecked { ++checks.burned; } } /// @notice Sacrifice multiple tokens to transfer their visual to other tokens. /// @param tokenIds The token IDs to transfer the art into. /// @param burnIds The token IDs to sacrifice. function inItForTheArts(uint256[] calldata tokenIds, uint256[] calldata burnIds) external { uint256 pairs = _multiTokenOperation(tokenIds, burnIds); for (uint256 i; i < pairs;) { _sacrifice(tokenIds[i], burnIds[i]); unchecked { ++i; } } unchecked { checks.burned += uint32(pairs); } } /// @notice Composite one token into another. This mixes the visual and reduces the number of checks. /// @param tokenId The token ID to keep alive. Its visual will change. /// @param burnId The token ID to composite into the tokenId. /// @param swap Swap the visuals before compositing. function composite(uint256 tokenId, uint256 burnId, bool swap) external { // Allow swapping the visuals before executing the composite. if (swap) { StoredCheck memory toKeep = checks.all[tokenId]; checks.all[tokenId] = checks.all[burnId]; checks.all[burnId] = toKeep; } _composite(tokenId, burnId); unchecked { ++checks.burned; } } /// @notice Composite multiple tokens. This mixes the visuals and checks in remaining tokens. /// @param tokenIds The token IDs to keep alive. Their art will change. /// @param burnIds The token IDs to composite. function compositeMany(uint256[] calldata tokenIds, uint256[] calldata burnIds) external { uint256 pairs = _multiTokenOperation(tokenIds, burnIds); for (uint256 i; i < pairs;) { _composite(tokenIds[i], burnIds[i]); unchecked { ++i; } } unchecked { checks.burned += uint32(pairs); } } /// @notice Sacrifice 64 single-check tokens to form a black check. /// @param tokenIds The token IDs to burn for the black check. /// @dev The check at index 0 survives. function infinity(uint256[] calldata tokenIds) external { uint256 count = tokenIds.length; // Make sure we're allowed to mint the black check. if (count != 64) { revert InvalidTokenCount(); } for (uint256 i; i < count;) { uint256 id = tokenIds[i]; if (checks.all[id].divisorIndex != 6) { revert BlackCheck__InvalidCheck(); } if (!_isApprovedOrOwner(msg.sender, id)) { revert NotAllowed(); } unchecked { ++i; } } // Complete final composite. uint256 blackCheckId = tokenIds[0]; StoredCheck storage check = checks.all[blackCheckId]; check.day = Utilities.day(checks.day0, block.timestamp); check.divisorIndex = 7; // Burn all 63 other Checks. for (uint i = 1; i < count;) { _burn(tokenIds[i]); unchecked { ++i; } } unchecked { checks.burned += 63; } // When one is released from the prison of self, that is indeed freedom. // For the most great prison is the prison of self. emit Infinity(blackCheckId, tokenIds[1:]); emit MetadataUpdate(blackCheckId); } /// @notice Burn a check. Note: This burn does not composite or swap tokens. /// @param tokenId The token ID to burn. /// @dev A common purpose burn method. function burn(uint256 tokenId) external { if (! _isApprovedOrOwner(msg.sender, tokenId)) { revert NotAllowed(); } // Perform the burn. _burn(tokenId); // Keep track of supply. unchecked { ++checks.burned; } } /// @notice Initializes and closes epochs. /// @dev Based on the commit-reveal scheme proposed by MouseDev. function resolveEpochIfNecessary() public { Epoch storage currentEpoch = checks.epochs[checks.epoch]; if ( // If epoch has not been committed, currentEpoch.committed == false || // Or the reveal commitment timed out. (currentEpoch.revealed == false && currentEpoch.revealBlock < block.number - 256) ) { // This means the epoch has not been committed, OR the epoch was committed but has expired. // Set committed to true, and record the reveal block: currentEpoch.revealBlock = uint64(block.number + 50); currentEpoch.committed = true; } else if (block.number > currentEpoch.revealBlock) { // Epoch has been committed and is within range to be revealed. // Set its randomness to the target block hash. currentEpoch.randomness = uint128(uint256(keccak256( abi.encodePacked( blockhash(currentEpoch.revealBlock), block.difficulty ))) % (2 ** 128 - 1) ); currentEpoch.revealed = true; // Notify DAPPs about the new epoch. emit NewEpoch(checks.epoch, currentEpoch.revealBlock); // Initialize the next epoch checks.epoch++; resolveEpochIfNecessary(); } } /// @notice The identifier of the current epoch function getEpoch() view public returns(uint256) { return checks.epoch; } /// @notice Get the data for a given epoch /// @param index The identifier of the epoch to fetch function getEpochData(uint256 index) view public returns(Epoch memory) { return checks.epochs[index]; } /// @notice Simulate a composite. /// @param tokenId The token to render. /// @param burnId The token to composite. function simulateComposite(uint256 tokenId, uint256 burnId) public view returns (Check memory check) { _requireMinted(tokenId); _requireMinted(burnId); // We want to simulate for the next divisor check count. uint8 index = checks.all[tokenId].divisorIndex; uint8 nextDivisor = index + 1; check = ChecksArt.getCheck(tokenId, nextDivisor, checks); // Simulate composite tree check.stored.composites[index] = uint16(burnId); // Simulate visual composite in stored data if we have many checks if (index < 5) { (uint8 gradient, uint8 colorBand) = _compositeGenes(tokenId, burnId); check.stored.colorBands[index] = colorBand; check.stored.gradients[index] = gradient; } // Simulate composite in memory data check.composite = !check.isRoot && index < 7 ? check.stored.composites[index] : 0; check.colorBand = ChecksArt.colorBandIndex(check, nextDivisor); check.gradient = ChecksArt.gradientIndex(check, nextDivisor); } /// @notice Render the SVG for a simulated composite. /// @param tokenId The token to render. /// @param burnId The token to composite. function simulateCompositeSVG(uint256 tokenId, uint256 burnId) external view returns (string memory) { return string(ChecksArt.generateSVG(simulateComposite(tokenId, burnId), checks)); } /// @notice Get the colors of all checks in a given token. /// @param tokenId The token ID to get colors for. /// @dev Consider using the ChecksArt and EightyColors Libraries /// in combination with the getCheck function to resolve this yourself. function colors(uint256 tokenId) external view returns (string[] memory, uint256[] memory) { return ChecksArt.colors(ChecksArt.getCheck(tokenId, checks), checks); } /// @notice Render the SVG for a given token. /// @param tokenId The token to render. /// @dev Consider using the ChecksArt Library directly. function svg(uint256 tokenId) external view returns (string memory) { return string(ChecksArt.generateSVG(ChecksArt.getCheck(tokenId, checks), checks)); } /// @notice Get the metadata for a given token. /// @param tokenId The token to render. /// @dev Consider using the ChecksMetadata Library directly. function tokenURI(uint256 tokenId) public view override returns (string memory) { _requireMinted(tokenId); return ChecksMetadata.tokenURI(tokenId, checks); } /// @notice Returns how many tokens this contract manages. function totalSupply() public view returns (uint256) { return checks.minted - checks.burned; } /// @dev Sacrifice one token to transfer its art to another. /// @param tokenId The token ID to keep. /// @param burnId The token ID to burn. function _sacrifice(uint256 tokenId, uint256 burnId) internal { (,StoredCheck storage toBurn,) = _tokenOperation(tokenId, burnId); // Copy over static genome settings checks.all[tokenId] = toBurn; // Update the birth date for this token. checks.all[tokenId].day = Utilities.day(checks.day0, block.timestamp); // Perform the burn. _burn(burnId); // Notify DAPPs about the Sacrifice. emit Sacrifice(burnId, tokenId); emit MetadataUpdate(tokenId); } /// @dev Composite one token into to another and burn it. /// @param tokenId The token ID to keep. Its art and check-count will change. /// @param burnId The token ID to burn in the process. function _composite(uint256 tokenId, uint256 burnId) internal { ( StoredCheck storage toKeep,, uint8 divisorIndex ) = _tokenOperation(tokenId, burnId); uint8 nextDivisor = divisorIndex + 1; // We only need to breed band + gradient up until 4-Checks. if (divisorIndex < 5) { (uint8 gradient, uint8 colorBand) = _compositeGenes(tokenId, burnId); toKeep.colorBands[divisorIndex] = colorBand; toKeep.gradients[divisorIndex] = gradient; } // Composite our check toKeep.day = Utilities.day(checks.day0, block.timestamp); toKeep.composites[divisorIndex] = uint16(burnId); toKeep.divisorIndex = nextDivisor; // Perform the burn. _burn(burnId); // Notify DAPPs about the Composite. emit Composite(tokenId, burnId, ChecksArt.DIVISORS()[toKeep.divisorIndex]); emit MetadataUpdate(tokenId); } /// @dev Composite the gradient and colorBand settings. /// @param tokenId The token ID to keep. /// @param burnId The token ID to burn. function _compositeGenes (uint256 tokenId, uint256 burnId) internal view returns (uint8 gradient, uint8 colorBand) { Check memory keeper = ChecksArt.getCheck(tokenId, checks); Check memory burner = ChecksArt.getCheck(burnId, checks); // Pseudorandom gene manipulation. uint256 randomizer = uint256(keccak256(abi.encodePacked(keeper.seed, burner.seed))); // If at least one token has a gradient, we force it in ~20% of cases. gradient = Utilities.random(randomizer, 100) > 80 ? randomizer % 2 == 0 ? Utilities.minGt0(keeper.gradient, burner.gradient) : Utilities.max(keeper.gradient, burner.gradient) : Utilities.min(keeper.gradient, burner.gradient); // We breed the lower end average color band when breeding. colorBand = Utilities.avg(keeper.colorBand, burner.colorBand); } /// @dev Make sure this is a valid request to composite/switch with multiple tokens. /// @param tokenIds The token IDs to keep. /// @param burnIds The token IDs to burn. function _multiTokenOperation(uint256[] calldata tokenIds, uint256[] calldata burnIds) internal pure returns (uint256 pairs) { pairs = tokenIds.length; if (pairs != burnIds.length) { revert InvalidTokenCount(); } } /// @dev Make sure this is a valid request to composite/switch a token pair. /// @param tokenId The token ID to keep. /// @param burnId The token ID to burn. function _tokenOperation(uint256 tokenId, uint256 burnId) internal view returns ( StoredCheck storage toKeep, StoredCheck storage toBurn, uint8 divisorIndex ) { toKeep = checks.all[tokenId]; toBurn = checks.all[burnId]; divisorIndex = toKeep.divisorIndex; if ( ! _isApprovedOrOwner(msg.sender, tokenId) || ! _isApprovedOrOwner(msg.sender, burnId) || divisorIndex != toBurn.divisorIndex || tokenId == burnId || divisorIndex > 5 ) { revert NotAllowed(); } } }
// 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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (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`. * * 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 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: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721 * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must * understand this adds an external call which potentially creates a reentrancy vulnerability. * * 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); }
// SPDX-License-Identifier: MIT // 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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (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 functionCallWithValue(target, data, 0, "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"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), "Address: call to non-contract"); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or 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 { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // 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 /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (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)); /// @solidity memory-safe-assembly 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; } }
// 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; } }
// 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; } }
// 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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol) pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { enum Rounding { Down, // Toward negative infinity Up, // Toward infinity Zero // Toward zero } /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a > b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a == 0 ? 0 : (a - 1) / b + 1; } /** * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) * with further edits by Uniswap Labs also under MIT license. */ function mulDiv( uint256 x, uint256 y, uint256 denominator ) internal pure returns (uint256 result) { unchecked { // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2^256 + prod0. uint256 prod0; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(x, y, not(0)) prod0 := mul(x, y) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division. if (prod1 == 0) { return prod0 / denominator; } // Make sure the result is less than 2^256. Also prevents denominator == 0. require(denominator > prod1); /////////////////////////////////////////////// // 512 by 256 division. /////////////////////////////////////////////// // Make division exact by subtracting the remainder from [prod1 prod0]. uint256 remainder; assembly { // Compute remainder using mulmod. remainder := mulmod(x, y, denominator) // Subtract 256 bit number from 512 bit number. prod1 := sub(prod1, gt(remainder, prod0)) prod0 := sub(prod0, remainder) } // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1. // See https://cs.stackexchange.com/q/138556/92363. // Does not overflow because the denominator cannot be zero at this stage in the function. uint256 twos = denominator & (~denominator + 1); assembly { // Divide denominator by twos. denominator := div(denominator, twos) // Divide [prod1 prod0] by twos. prod0 := div(prod0, twos) // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one. twos := add(div(sub(0, twos), twos), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * twos; // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for // four bits. That is, denominator * inv = 1 mod 2^4. uint256 inverse = (3 * denominator) ^ 2; // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works // in modular arithmetic, doubling the correct bits in each step. inverse *= 2 - denominator * inverse; // inverse mod 2^8 inverse *= 2 - denominator * inverse; // inverse mod 2^16 inverse *= 2 - denominator * inverse; // inverse mod 2^32 inverse *= 2 - denominator * inverse; // inverse mod 2^64 inverse *= 2 - denominator * inverse; // inverse mod 2^128 inverse *= 2 - denominator * inverse; // inverse mod 2^256 // Because the division is now exact we can divide by multiplying with the modular inverse of denominator. // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inverse; return result; } } /** * @notice Calculates x * y / denominator with full precision, following the selected rounding direction. */ function mulDiv( uint256 x, uint256 y, uint256 denominator, Rounding rounding ) internal pure returns (uint256) { uint256 result = mulDiv(x, y, denominator); if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) { result += 1; } return result; } /** * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down. * * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11). */ function sqrt(uint256 a) internal pure returns (uint256) { if (a == 0) { return 0; } // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target. // // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`. // // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)` // β `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))` // β `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)` // // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit. uint256 result = 1 << (log2(a) >> 1); // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128, // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision // into the expected uint128 result. unchecked { result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; return min(result, a / result); } } /** * @notice Calculates sqrt(a), following the selected rounding direction. */ function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = sqrt(a); return result + (rounding == Rounding.Up && result * result < a ? 1 : 0); } } /** * @dev Return the log in base 2, rounded down, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 128; } if (value >> 64 > 0) { value >>= 64; result += 64; } if (value >> 32 > 0) { value >>= 32; result += 32; } if (value >> 16 > 0) { value >>= 16; result += 16; } if (value >> 8 > 0) { value >>= 8; result += 8; } if (value >> 4 > 0) { value >>= 4; result += 4; } if (value >> 2 > 0) { value >>= 2; result += 2; } if (value >> 1 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 2, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log2(value); return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0); } } /** * @dev Return the log in base 10, rounded down, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >= 10**64) { value /= 10**64; result += 64; } if (value >= 10**32) { value /= 10**32; result += 32; } if (value >= 10**16) { value /= 10**16; result += 16; } if (value >= 10**8) { value /= 10**8; result += 8; } if (value >= 10**4) { value /= 10**4; result += 4; } if (value >= 10**2) { value /= 10**2; result += 2; } if (value >= 10**1) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log10(value); return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0); } } /** * @dev Return the log in base 256, rounded down, of a positive value. * Returns 0 if given 0. * * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string. */ function log256(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 16; } if (value >> 64 > 0) { value >>= 64; result += 8; } if (value >> 32 > 0) { value >>= 32; result += 4; } if (value >> 16 > 0) { value >>= 16; result += 2; } if (value >> 8 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log256(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log256(value); return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol) pragma solidity ^0.8.0; import "./math/Math.sol"; /** * @dev String operations. */ library Strings { bytes16 private constant _SYMBOLS = "0123456789abcdef"; uint8 private constant _ADDRESS_LENGTH = 20; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { unchecked { uint256 length = Math.log10(value) + 1; string memory buffer = new string(length); uint256 ptr; /// @solidity memory-safe-assembly assembly { ptr := add(buffer, add(32, length)) } while (true) { ptr--; /// @solidity memory-safe-assembly assembly { mstore8(ptr, byte(mod(value, 10), _SYMBOLS)) } value /= 10; if (value == 0) break; } return buffer; } } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { unchecked { return toHexString(value, Math.log256(value) + 1); } } /** * @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] = _SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } /** * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation. */ function toHexString(address addr) internal pure returns (string memory) { return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.17; interface IChecks { struct StoredCheck { uint16[6] composites; // The tokenIds that were composited into this one uint8[5] colorBands; // The length of the used color band in percent uint8[5] gradients; // Gradient settings for each generation uint8 divisorIndex; // Easy access to next / previous divisor uint32 epoch; // Each check is revealed in an epoch uint16 seed; // A unique identifyer to enable swapping uint24 day; // The days since token was created } struct Check { StoredCheck stored; // We carry over the check from storage bool isRevealed; // Whether the check is revealed uint256 seed; // The instantiated seed for pseudo-randomisation uint8 checksCount; // How many checks this token has bool hasManyChecks; // Whether the check has many checks uint16 composite; // The parent tokenId that was composited into this one bool isRoot; // Whether it has no parents (80 checks) uint8 colorBand; // 100%, 50%, 25%, 12.5%, 6.25%, 5%, 1.25% uint8 gradient; // Linearly through the colorBand [1, 2, 3] uint8 direction; // Animation direction uint8 speed; // Animation speed } struct Epoch { uint128 randomness; // The source of randomness for tokens from this epoch uint64 revealBlock; // The block at which this epoch was / is revealed bool committed; // Whether the epoch has been instantiated bool revealed; // Whether the epoch has been revealed } struct Checks { mapping(uint256 => StoredCheck) all; // All checks uint32 minted; // The number of checks editions that have been migrated uint32 burned; // The number of tokens that have been burned uint32 day0; // Marks the start of this journey mapping(uint256 => Epoch) epochs; // All epochs uint256 epoch; // The current epoch index } event Sacrifice( uint256 indexed burnedId, uint256 indexed tokenId ); event Composite( uint256 indexed tokenId, uint256 indexed burnedId, uint8 indexed checks ); event Infinity( uint256 indexed tokenId, uint256[] indexed burnedIds ); event NewEpoch( uint256 indexed epoch, uint64 indexed revealBlock ); error NotAllowed(); error InvalidTokenCount(); error BlackCheck__InvalidCheck(); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.17; interface IChecksEdition { /// @dev Burns `tokenId`. See {ERC721-_burn}. function burn(uint256 tokenId) external; /// @dev Returns the owner of the `tokenId` token. function ownerOf(uint256 tokenId) external view returns (address owner); /// @dev Returns if the `operator` is allowed to manage all of the assets of `owner`. function isApprovedForAll(address owner, address operator) external view returns (bool); /// @dev Returns the approved operator of a specific token. function getApproved(uint256 tokenId) external view returns (address operator); /// @dev Error when burning unapproved tokens. error TransferCallerNotOwnerNorApproved(); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/CHECKS721.sol) pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC721/IERC721.sol"; import "@openzeppelin/contracts/utils/introspection/IERC165.sol"; /// @title EIP-721 Metadata Update Extension interface IERC4906 is IERC165, IERC721 { /// @dev This event emits when the metadata of a token is changed. /// Third-party platforms such as NFT marketplaces can listen to /// the event and auto-update the tokens in their apps. event MetadataUpdate(uint256 _tokenId); }
//SPDX-License-Identifier: MIT pragma solidity ^0.8.17; import "./EightyColors.sol"; import "../interfaces/IChecks.sol"; import "./Utilities.sol"; /** ///////// VV CHECKS ///////// // // // // // // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // // // // // // ///// DONT TRUST, CHECK ///// @title ChecksArt @author VisualizeValue @notice Renders the Checks visuals. */ library ChecksArt { /// @dev The path for a 20x20 px check based on a 36x36 px frame. string public constant CHECKS_PATH = 'M21.36 9.886A3.933 3.933 0 0 0 18 8c-1.423 0-2.67.755-3.36 1.887a3.935 3.935 0 0 0-4.753 4.753A3.933 3.933 0 0 0 8 18c0 1.423.755 2.669 1.886 3.36a3.935 3.935 0 0 0 4.753 4.753 3.933 3.933 0 0 0 4.863 1.59 3.953 3.953 0 0 0 1.858-1.589 3.935 3.935 0 0 0 4.753-4.754A3.933 3.933 0 0 0 28 18a3.933 3.933 0 0 0-1.887-3.36 3.934 3.934 0 0 0-1.042-3.711 3.934 3.934 0 0 0-3.71-1.043Zm-3.958 11.713 4.562-6.844c.566-.846-.751-1.724-1.316-.878l-4.026 6.043-1.371-1.368c-.717-.722-1.836.396-1.116 1.116l2.17 2.15a.788.788 0 0 0 1.097-.22Z'; /// @dev The semiperfect divisors of the 80 checks. function DIVISORS() public pure returns (uint8[8] memory) { return [ 80, 40, 20, 10, 5, 4, 1, 0 ]; } /// @dev The different color band sizes that we use for the art. function COLOR_BANDS() public pure returns (uint8[7] memory) { return [ 80, 60, 40, 20, 10, 5, 1 ]; } /// @dev The gradient increment steps. function GRADIENTS() public pure returns (uint8[7] memory) { return [ 0, 1, 2, 5, 8, 9, 10 ]; } /// @dev Load a check from storage and fill its current state settings. /// @param tokenId The id of the check to fetch. /// @param checks The DB containing all checks. function getCheck( uint256 tokenId, IChecks.Checks storage checks ) public view returns (IChecks.Check memory check) { IChecks.StoredCheck memory stored = checks.all[tokenId]; return getCheck(tokenId, stored.divisorIndex, checks); } /// @dev Load a check from storage and fill its current state settings. /// @param tokenId The id of the check to fetch. /// @param divisorIndex The divisorindex to get. /// @param checks The DB containing all checks. function getCheck( uint256 tokenId, uint8 divisorIndex, IChecks.Checks storage checks ) public view returns (IChecks.Check memory check) { IChecks.StoredCheck memory stored = checks.all[tokenId]; stored.divisorIndex = divisorIndex; // Override in case we're fetching specific state. check.stored = stored; // Set up the source of randomness + seed for this Check. uint128 randomness = checks.epochs[stored.epoch].randomness; check.seed = (uint256(keccak256(abi.encodePacked(randomness, stored.seed))) % type(uint128).max); // Helpers check.isRoot = divisorIndex == 0; check.isRevealed = randomness > 0; check.hasManyChecks = divisorIndex < 6; check.composite = !check.isRoot && divisorIndex < 7 ? stored.composites[divisorIndex - 1] : 0; // Token properties check.colorBand = colorBandIndex(check, divisorIndex); check.gradient = gradientIndex(check, divisorIndex); check.checksCount = DIVISORS()[divisorIndex]; check.speed = uint8(2**(check.seed % 3)); check.direction = uint8(check.seed % 2); } /// @dev Query the gradient of a given check at a certain check count. /// @param check The check we want to get the gradient for. /// @param divisorIndex The check divisor in question. function gradientIndex(IChecks.Check memory check, uint8 divisorIndex) public pure returns (uint8) { uint256 n = Utilities.random(check.seed, 'gradient', 100); return divisorIndex == 0 ? n < 20 ? uint8(1 + (n % 6)) : 0 : divisorIndex < 6 ? check.stored.gradients[divisorIndex - 1] : 0; } /// @dev Query the color band of a given check at a certain check count. /// @param check The check we want to get the color band for. /// @param divisorIndex The check divisor in question. function colorBandIndex(IChecks.Check memory check, uint8 divisorIndex) public pure returns (uint8) { uint256 n = Utilities.random(check.seed, 'band', 120); return divisorIndex == 0 ? ( n > 80 ? 0 : n > 40 ? 1 : n > 20 ? 2 : n > 10 ? 3 : n > 4 ? 4 : n > 1 ? 5 : 6 ) : divisorIndex < 6 ? check.stored.colorBands[divisorIndex - 1] : 6; } /// @dev Generate indexes for the color slots of check parents (up to the EightyColors.COLORS themselves). /// @param divisorIndex The current divisorIndex to query. /// @param check The current check to investigate. /// @param checks The DB containing all checks. function colorIndexes( uint8 divisorIndex, IChecks.Check memory check, IChecks.Checks storage checks ) public view returns (uint256[] memory) { uint8[8] memory divisors = DIVISORS(); uint256 checksCount = divisors[divisorIndex]; uint256 seed = check.seed; uint8 colorBand = COLOR_BANDS()[colorBandIndex(check, divisorIndex)]; uint8 gradient = GRADIENTS()[gradientIndex(check, divisorIndex)]; // If we're a composited check, we choose colors only based on // the slots available in our parents. Otherwise, // we choose based on our available spectrum. uint256 possibleColorChoices = divisorIndex > 0 ? divisors[divisorIndex - 1] * 2 : 80; // We initialize our index and select the first color uint256[] memory indexes = new uint256[](checksCount); indexes[0] = Utilities.random(seed, possibleColorChoices); // If we have more than one check, continue selecting colors if (check.hasManyChecks) { if (gradient > 0) { // If we're a gradient check, we select based on the color band looping around // the 80 possible colors for (uint256 i = 1; i < checksCount;) { indexes[i] = (indexes[0] + (i * gradient * colorBand / checksCount) % colorBand) % 80; unchecked { ++i; } } } else if (divisorIndex == 0) { // If we select initial non gradient colors, we just take random ones // available in our color band for (uint256 i = 1; i < checksCount;) { indexes[i] = (indexes[0] + Utilities.random(seed + i, colorBand)) % 80; unchecked { ++i; } } } else { // If we have parent checks, we select our colors from their set for (uint256 i = 1; i < checksCount;) { indexes[i] = Utilities.random(seed + i, possibleColorChoices); unchecked { ++i; } } } } // We resolve our color indexes through our parent tree until we reach the root checks if (divisorIndex > 0) { uint8 previousDivisor = divisorIndex - 1; // We already have our current check, but need the our parent state color indices uint256[] memory parentIndexes = colorIndexes(previousDivisor, check, checks); // We also need to fetch the colors of the check that was composited into us IChecks.Check memory composited = getCheck(check.composite, checks); uint256[] memory compositedIndexes = colorIndexes(previousDivisor, composited, checks); // Replace random indices with parent / root color indices uint8 count = divisors[previousDivisor]; // We always select the first color from our parent uint256 initialBranchIndex = indexes[0] % count; indexes[0] = indexes[0] < count ? parentIndexes[initialBranchIndex] : compositedIndexes[initialBranchIndex]; // If we don't have a gradient, we continue resolving from our parent for the remaining checks if (gradient == 0) { for (uint256 i; i < checksCount;) { uint256 branchIndex = indexes[i] % count; indexes[i] = indexes[i] < count ? parentIndexes[branchIndex] : compositedIndexes[branchIndex]; unchecked { ++i; } } // If we have a gradient we base the remaining colors off our initial selection } else { for (uint256 i = 1; i < checksCount;) { indexes[i] = (indexes[0] + (i * gradient * colorBand / checksCount) % colorBand) % 80; unchecked { ++i; } } } } return indexes; } /// @dev Fetch all colors of a given Check. /// @param check The check to get colors for. /// @param checks The DB containing all checks. function colors( IChecks.Check memory check, IChecks.Checks storage checks ) public view returns (string[] memory, uint256[] memory) { // A fully composited check has no color. if (check.stored.divisorIndex == 7) { string[] memory zeroColors = new string[](1); uint256[] memory zeroIndexes = new uint256[](1); zeroColors[0] = '000'; zeroIndexes[0] = 999; return (zeroColors, zeroIndexes); } // An unrevealed check is all gray. if (! check.isRevealed) { string[] memory preRevealColors = new string[](1); uint256[] memory preRevealIndexes = new uint256[](1); preRevealColors[0] = '424242'; preRevealIndexes[0] = 0; return (preRevealColors, preRevealIndexes); } // Fetch the indices on the original color mapping. uint256[] memory indexes = colorIndexes(check.stored.divisorIndex, check, checks); // Map over to get the colors. string[] memory checkColors = new string[](indexes.length); string[80] memory allColors = EightyColors.COLORS(); // Always set the first color. checkColors[0] = allColors[indexes[0]]; // Resolve each additional check color via their index in EightyColors.COLORS. for (uint256 i = 1; i < indexes.length; i++) { checkColors[i] = allColors[indexes[i]]; } return (checkColors, indexes); } /// @dev Get the number of checks we should display per row. /// @param checks The number of checks in the piece. function perRow(uint8 checks) public pure returns (uint8) { return checks == 80 ? 8 : checks >= 20 ? 4 : checks == 10 || checks == 4 ? 2 : 1; } /// @dev Get the X-offset for positioning checks horizontally. /// @param checks The number of checks in the piece. function rowX(uint8 checks) public pure returns (uint16) { return checks <= 1 ? 286 : checks == 5 ? 304 : checks == 10 || checks == 4 ? 268 : 196; } /// @dev Get the Y-offset for positioning checks vertically. /// @param checks The number of checks in the piece. function rowY(uint8 checks) public pure returns (uint16) { return checks > 4 ? 160 : checks == 4 ? 268 : checks > 1 ? 304 : 286; } /// @dev Get the animation SVG snipped for an individual check of a piece. /// @param data The data object containing rendering settings. /// @param offset The index position of the check in question. /// @param allColors All available colors. function fillAnimation( CheckRenderData memory data, uint256 offset, string[80] memory allColors ) public pure returns (bytes memory) { // We only pick 20 colors from our gradient to reduce execution time. uint8 count = 20; bytes memory values; // Reverse loop through our color gradient. if (data.check.direction == 0) { for (uint256 i = offset + 80; i > offset;) { values = abi.encodePacked(values, '#', allColors[i % 80], ';'); unchecked { i-=4; } } // Forward loop through our color gradient. } else { for (uint256 i = offset; i < offset + 80;) { values = abi.encodePacked(values, '#', allColors[i % 80], ';'); unchecked { i+=4; } } } // Add initial color as last one for smooth animations. values = abi.encodePacked(values, '#', allColors[offset]); // Render the SVG snipped for the animation return abi.encodePacked( '<animate ', 'attributeName="fill" values="',values,'" ', 'dur="',Utilities.uint2str(count * 2 / data.check.speed),'s" begin="animation.begin" ', 'repeatCount="indefinite" ', '/>' ); } /// @dev Generate the SVG code for all checks in a given token. /// @param data The data object containing rendering settings. function generateChecks(CheckRenderData memory data) public pure returns (bytes memory) { bytes memory checksBytes; string[80] memory allColors = EightyColors.COLORS(); uint8 checksCount = data.count; for (uint8 i; i < checksCount; i++) { // Compute row settings. data.indexInRow = i % data.perRow; data.isNewRow = data.indexInRow == 0 && i > 0; // Compute offsets. if (data.isNewRow) data.rowY += data.spaceY; if (data.isNewRow && data.indent) { if (i == 0) { data.rowX += data.spaceX / 2; } if (i % (data.perRow * 2) == 0) { data.rowX -= data.spaceX / 2; } else { data.rowX += data.spaceX / 2; } } string memory translateX = Utilities.uint2str(data.rowX + data.indexInRow * data.spaceX); string memory translateY = Utilities.uint2str(data.rowY); string memory color = data.check.isRevealed ? data.colors[i] : data.colors[0]; // Render the current check. checksBytes = abi.encodePacked(checksBytes, abi.encodePacked( '<g transform="translate(', translateX, ', ', translateY, ') scale(', data.scale, ')">', '<use href="#check" fill="#', color, '">', (data.check.isRevealed && !data.isBlack) ? fillAnimation(data, data.colorIndexes[i], allColors) : bytes(''), '</use>' '</g>' )); } return checksBytes; } /// @dev Collect relevant rendering data for easy access across functions. /// @param check Our current check loaded from storage. /// @param checks The DB containing all checks. function collectRenderData( IChecks.Check memory check, IChecks.Checks storage checks ) public view returns (CheckRenderData memory data) { // Carry through base settings. data.check = check; data.isBlack = check.stored.divisorIndex == 7; data.count = data.isBlack ? 1 : DIVISORS()[check.stored.divisorIndex]; // Compute colors and indexes. (string[] memory colors_, uint256[] memory colorIndexes_) = colors(check, checks); data.gridColor = data.isBlack ? '#F2F2F2' : '#191919'; data.canvasColor = data.isBlack ? '#FFF' : '#111'; data.colorIndexes = colorIndexes_; data.colors = colors_; // Compute positioning data. data.scale = data.count > 20 ? '1' : data.count > 1 ? '2' : '3'; data.spaceX = data.count == 80 ? 36 : 72; data.spaceY = data.count > 20 ? 36 : 72; data.perRow = perRow(data.count); data.indent = data.count == 40; data.rowX = rowX(data.count); data.rowY = rowY(data.count); } /// @dev Generate the SVG code for rows in the 8x10 Checks grid. function generateGridRow() public pure returns (bytes memory) { bytes memory row; for (uint256 i; i < 8; i++) { row = abi.encodePacked( row, '<use href="#square" x="', Utilities.uint2str(196 + i*36), '" y="160"/>' ); } return row; } /// @dev Generate the SVG code for the entire 8x10 Checks grid. function generateGrid() public pure returns (bytes memory) { bytes memory grid; for (uint256 i; i < 10; i++) { grid = abi.encodePacked( grid, '<use href="#row" y="', Utilities.uint2str(i*36), '"/>' ); } return abi.encodePacked('<g id="grid" x="196" y="160">', grid, '</g>'); } /// @dev Generate the complete SVG code for a given Check. /// @param check The check to render. /// @param checks The DB containing all checks. function generateSVG( IChecks.Check memory check, IChecks.Checks storage checks ) public view returns (bytes memory) { CheckRenderData memory data = collectRenderData(check, checks); return abi.encodePacked( '<svg ', 'viewBox="0 0 680 680" ', 'fill="none" xmlns="http://www.w3.org/2000/svg" ', 'style="width:100%;background:black;"', '>', '<defs>', '<path id="check" fill-rule="evenodd" d="', CHECKS_PATH, '"></path>', '<rect id="square" width="36" height="36" stroke="', data.gridColor, '"></rect>', '<g id="row">', generateGridRow(), '</g>' '</defs>', '<rect width="680" height="680" fill="black"/>', '<rect x="188" y="152" width="304" height="376" fill="', data.canvasColor, '"/>', generateGrid(), generateChecks(data), '<rect width="680" height="680" fill="transparent">', '<animate ', 'attributeName="width" ', 'from="680" ', 'to="0" ', 'dur="0.2s" ', 'begin="click" ', 'fill="freeze" ', 'id="animation"', '/>', '</rect>', '</svg>' ); } } /// @dev Bag holding all data relevant for rendering. struct CheckRenderData { IChecks.Check check; uint256[] colorIndexes; string[] colors; string canvasColor; string gridColor; string duration; string scale; uint32 seed; uint16 rowX; uint16 rowY; uint8 count; uint8 spaceX; uint8 spaceY; uint8 perRow; uint8 indexInRow; uint8 isIndented; bool isNewRow; bool isBlack; bool indent; }
//SPDX-License-Identifier: MIT pragma solidity ^0.8.17; import "@openzeppelin/contracts/utils/Base64.sol"; import "./ChecksArt.sol"; import "../interfaces/IChecks.sol"; import "./Utilities.sol"; /** βββββββ ββββββββ ββββββ ββββββββ βββββββ ββ ββ ββ ββ ββ ββ ββ ββ ββ ββ ββββ ββ ββ ββ ββ ββ ββ ββ ββββββ ββββββββ ββ ββ βββββββ ββ ββ ββ ββ ββ ββ ββ ββ ββ ββ ββ ββ ββ ββ ββ ββ βββββββ ββ ββ ββββββ ββ βββββββββ ββββ @title ChecksMetadata @author VisualizeValue @notice Renders ERC721 compatible metadata for Checks. */ library ChecksMetadata { /// @dev Render the JSON Metadata for a given Checks token. /// @param tokenId The id of the token to render. /// @param checks The DB containing all checks. function tokenURI( uint256 tokenId, IChecks.Checks storage checks ) public view returns (string memory) { IChecks.Check memory check = ChecksArt.getCheck(tokenId, checks); bytes memory svg = ChecksArt.generateSVG(check, checks); bytes memory metadata = abi.encodePacked( '{', '"name": "Checks ', Utilities.uint2str(tokenId), '",', '"description": "This artwork may or may not be notable.",', '"image": ', '"data:image/svg+xml;base64,', Base64.encode(svg), '",', '"animation_url": ', '"data:text/html;base64,', Base64.encode(generateHTML(tokenId, svg)), '",', '"attributes": [', attributes(check), ']', '}' ); return string( abi.encodePacked( "data:application/json;base64,", Base64.encode(metadata) ) ); } /// @dev Render the JSON atributes for a given Checks token. /// @param check The check to render. function attributes(IChecks.Check memory check) public pure returns (bytes memory) { bool showVisualAttributes = check.isRevealed && check.hasManyChecks; bool showAnimationAttributes = check.isRevealed && check.checksCount > 0; return abi.encodePacked( showVisualAttributes ? trait('Color Band', colorBand(ChecksArt.colorBandIndex(check, check.stored.divisorIndex)), ',') : '', showVisualAttributes ? trait('Gradient', gradients(ChecksArt.gradientIndex(check, check.stored.divisorIndex)), ',') : '', showAnimationAttributes ? trait('Speed', check.speed == 4 ? '2x' : check.speed == 2 ? '1x' : '0.5x', ',') : '', showAnimationAttributes ? trait('Shift', check.direction == 0 ? 'IR' : 'UV', ',') : '', check.isRevealed == false ? trait('Revealed', 'No', ',') : '', trait('Checks', Utilities.uint2str(check.checksCount), ','), trait('Day', Utilities.uint2str(check.stored.day), '') ); } /// @dev Get the names for different gradients. Compare ChecksArt.GRADIENTS. /// @param gradientIndex The index of the gradient. function gradients(uint8 gradientIndex) public pure returns (string memory) { return [ 'None', 'Linear', 'Double Linear', 'Reflected', 'Double Angled', 'Angled', 'Linear Z' ][gradientIndex]; } /// @dev Get the percentage values for different color bands. Compare ChecksArt.COLOR_BANDS. /// @param bandIndex The index of the color band. function colorBand(uint8 bandIndex) public pure returns (string memory) { return [ 'Eighty', 'Sixty', 'Forty', 'Twenty', 'Ten', 'Five', 'One' ][bandIndex]; } /// @dev Generate the SVG snipped for a single attribute. /// @param traitType The `trait_type` for this trait. /// @param traitValue The `value` for this trait. /// @param append Helper to append a comma. function trait( string memory traitType, string memory traitValue, string memory append ) public pure returns (string memory) { return string(abi.encodePacked( '{', '"trait_type": "', traitType, '",' '"value": "', traitValue, '"' '}', append )); } /// @dev Generate the HTML for the animation_url in the metadata. /// @param tokenId The id of the token to generate the embed for. /// @param svg The rendered SVG code to embed in the HTML. function generateHTML(uint256 tokenId, bytes memory svg) public pure returns (bytes memory) { return abi.encodePacked( '<!DOCTYPE html>', '<html lang="en">', '<head>', '<meta charset="UTF-8">', '<meta http-equiv="X-UA-Compatible" content="IE=edge">', '<meta name="viewport" content="width=device-width, initial-scale=1.0">', '<title>Check #', Utilities.uint2str(tokenId), '</title>', '<style>', 'html,', 'body {', 'margin: 0;', 'background: #EFEFEF;', 'overflow: hidden;', '}', 'svg {', 'max-width: 100vw;', 'max-height: 100vh;', '}', '</style>', '</head>', '<body>', svg, '</body>', '</html>' ); } }
//SPDX-License-Identifier: MIT pragma solidity ^0.8.17; /** ///////////////////////////////// // // // // // // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // β β β β β β β β // // // // // // // ///////////////////////////////// @title EightyColors @author VisualizeValue @notice The eighty colors of Checks. */ library EightyColors { /// @dev Theese are sorted in a gradient. function COLORS() public pure returns (string[80] memory) { return [ 'E84AA9', 'F2399D', 'DB2F96', 'E73E85', 'FF7F8E', 'FA5B67', 'E8424E', 'D5332F', 'C23532', 'F2281C', 'D41515', '9D262F', 'DE3237', 'DA3321', 'EA3A2D', 'EB4429', 'EC7368', 'FF8079', 'FF9193', 'EA5B33', 'D05C35', 'ED7C30', 'EF9933', 'EF8C37', 'F18930', 'F09837', 'F9A45C', 'F2A43A', 'F2A840', 'F2A93C', 'FFB340', 'F2B341', 'FAD064', 'F7CA57', 'F6CB45', 'FFAB00', 'F4C44A', 'FCDE5B', 'F9DA4D', 'F9DA4A', 'FAE272', 'F9DB49', 'FAE663', 'FBEA5B', 'A7CA45', 'B5F13B', '94E337', '63C23C', '86E48E', '77E39F', '5FCD8C', '83F1AE', '9DEFBF', '2E9D9A', '3EB8A1', '5FC9BF', '77D3DE', '6AD1DE', '5ABAD3', '4291A8', '33758D', '45B2D3', '81D1EC', 'A7DDF9', '9AD9FB', 'A4C8EE', '60B1F4', '2480BD', '4576D0', '3263D0', '2E4985', '25438C', '525EAA', '3D43B3', '322F92', '4A2387', '371471', '3B088C', '6C31D7', '9741DA' ]; } }
//SPDX-License-Identifier: MIT pragma solidity ^0.8.17; library Utilities { /// @dev Zero-index based pseudorandom number based on one input and max bound function random(uint256 input, uint256 _max) internal pure returns (uint256) { return (uint256(keccak256(abi.encodePacked(input))) % _max); } /// @dev Zero-index based salted pseudorandom number based on two inputs and max bound function random(uint256 input, string memory salt, uint256 _max) internal pure returns (uint256) { return (uint256(keccak256(abi.encodePacked(input, salt))) % _max); } /// @dev Convert an 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); } /// @dev Get the smallest non zero number function minGt0(uint8 one, uint8 two) internal pure returns (uint8) { return one > two ? two > 0 ? two : one : one; } /// @dev Get the smaller number function min(uint8 one, uint8 two) internal pure returns (uint8) { return one < two ? one : two; } /// @dev Get the larger number function max(uint8 one, uint8 two) internal pure returns (uint8) { return one > two ? one : two; } /// @dev Get the average between two numbers function avg(uint8 one, uint8 two) internal pure returns (uint8 result) { unchecked { result = (one >> 1) + (two >> 1) + (one & two & 1); } } /// @dev Get the days since another date (input is seconds) function day(uint256 from, uint256 to) internal pure returns (uint24) { return uint24((to - from) / 24 hours + 1); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/CHECKS721.sol) pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC721/IERC721.sol"; import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol"; import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol"; import "@openzeppelin/contracts/utils/Address.sol"; import "@openzeppelin/contracts/utils/Context.sol"; import "@openzeppelin/contracts/utils/Strings.sol"; import "@openzeppelin/contracts/utils/introspection/ERC165.sol"; import "../interfaces/IERC4906.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 CHECKS721 is Context, ERC165, IERC721, IERC721Metadata, IERC4906 { error ERC721__InvalidApproval(); error ERC721__InvalidOwner(); error ERC721__InvalidToken(); error ERC721__NotAllowed(); error ERC721__TokenExists(); error ERC721__TransferToNonReceiver(); error ERC721__TransferToZero(); 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() { _name = "Checks"; _symbol = "CHECKS"; } /** * @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) { if (owner == address(0)) { revert ERC721__InvalidOwner(); } return _balances[owner]; } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { address owner = _ownerOf(tokenId); if (owner == address(0)) { revert ERC721__InvalidToken(); } 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) { _requireMinted(tokenId); return ""; } /** * @dev See {IERC721-approve}. */ function approve(address to, uint256 tokenId) public virtual override { address owner = CHECKS721.ownerOf(tokenId); if ( to == owner || ( _msgSender() != owner && !isApprovedForAll(owner, _msgSender()) ) ) { revert ERC721__InvalidApproval(); } _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { _requireMinted(tokenId); 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 { if (!_isApprovedOrOwner(_msgSender(), tokenId)) { revert ERC721__NotAllowed(); } _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 { if (!_isApprovedOrOwner(_msgSender(), tokenId)) { revert ERC721__NotAllowed(); } _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); if (!_checkOnERC721Received(from, to, tokenId, data)) { revert ERC721__TransferToNonReceiver(); } } /** * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist */ function _ownerOf(uint256 tokenId) internal view virtual returns (address) { return _owners[tokenId]; } /** * @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 _ownerOf(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) { address owner = CHECKS721.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); if (!_checkOnERC721Received(address(0), to, tokenId, data)) { revert ERC721__TransferToNonReceiver(); } } /** * @dev Safely mints `tokenId` and transfers it to `to` after an inital transfer to `via`. * * 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 _safeMintVia(address to, address via, uint256 tokenId) internal virtual { _safeMintVia(to, via, 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 _safeMintVia( address to, address via, uint256 tokenId, bytes memory data ) internal virtual { _mintVia(to, via, tokenId); if (!_checkOnERC721Received(address(0), to, tokenId, data)) { revert ERC721__TransferToNonReceiver(); } } /** * @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 { _mintState(to, tokenId); emit Transfer(address(0), to, tokenId); _afterTokenTransfer(address(0), to, tokenId, 1); } /** * @dev Mints `tokenId` and transfers it to `to` after a transfer to `via` * * 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 _mintVia(address to, address via, uint256 tokenId) internal virtual { _mintState(to, tokenId); emit Transfer(address(0), via, tokenId); emit Transfer(via, to, tokenId); _afterTokenTransfer(address(0), to, tokenId, 1); } /** * @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. */ function _mintState(address to, uint256 tokenId) internal virtual { if (to == address(0)) { revert ERC721__TransferToZero(); } if (_exists(tokenId)) { revert ERC721__TokenExists(); } _beforeTokenTransfer(address(0), to, tokenId, 1); // Check that tokenId was not minted by `_beforeTokenTransfer` hook if (_exists(tokenId)) { revert ERC721__TokenExists(); } unchecked { // Will not overflow unless all 2**256 token ids are minted to the same owner. // Given that tokens are minted one by one, it is impossible in practice that // this ever happens. Might change if we allow batch minting. // The ERC fails to describe this case. _balances[to] += 1; } _owners[tokenId] = to; } /** * @dev Destroys `tokenId`. * The approval is cleared when the token is burned. * This is an internal function that does not check if the sender is authorized to operate on the token. * * Requirements: * * - `tokenId` must exist. * * Emits a {Transfer} event. */ function _burn(uint256 tokenId) internal virtual { address owner = CHECKS721.ownerOf(tokenId); _beforeTokenTransfer(owner, address(0), tokenId, 1); // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook owner = CHECKS721.ownerOf(tokenId); // Clear approvals delete _tokenApprovals[tokenId]; unchecked { // Cannot overflow, as that would require more tokens to be burned/transferred // out than the owner initially received through minting and transferring in. _balances[owner] -= 1; } delete _owners[tokenId]; emit Transfer(owner, address(0), tokenId); _afterTokenTransfer(owner, address(0), tokenId, 1); } /** * @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 { if (CHECKS721.ownerOf(tokenId) != from) { revert ERC721__InvalidOwner(); } if (to == address(0)) { revert ERC721__TransferToZero(); } _beforeTokenTransfer(from, to, tokenId, 1); // Check that tokenId was not transferred by `_beforeTokenTransfer` hook if (CHECKS721.ownerOf(tokenId) != from) { revert ERC721__InvalidOwner(); } // Clear approvals from the previous owner delete _tokenApprovals[tokenId]; unchecked { // `_balances[from]` cannot overflow for the same reason as described in `_burn`: // `from`'s balance is the number of token held, which is at least one before the current // transfer. // `_balances[to]` could overflow in the conditions described in `_mint`. That would require // all 2**256 token ids to be minted, which in practice is impossible. _balances[from] -= 1; _balances[to] += 1; } _owners[tokenId] = to; emit Transfer(from, to, tokenId); _afterTokenTransfer(from, to, tokenId, 1); } /** * @dev Approve `to` to operate on `tokenId` * * Emits an {Approval} event. */ function _approve(address to, uint256 tokenId) internal virtual { _tokenApprovals[tokenId] = to; emit Approval(CHECKS721.ownerOf(tokenId), to, tokenId); } /** * @dev Approve `operator` to operate on all of `owner` tokens * * Emits an {ApprovalForAll} event. */ function _setApprovalForAll( address owner, address operator, bool approved ) internal virtual { if (owner == operator) { revert ERC721__InvalidApproval(); } _operatorApprovals[owner][operator] = approved; emit ApprovalForAll(owner, operator, approved); } /** * @dev Reverts if the `tokenId` has not been minted yet. */ function _requireMinted(uint256 tokenId) internal view virtual { if (!_exists(tokenId)) { revert ERC721__InvalidToken(); } } /** * @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__TransferToNonReceiver(); } else { /// @solidity memory-safe-assembly assembly { revert(add(32, reason), mload(reason)) } } } } else { return true; } } /** * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`. * - When `from` is zero, the tokens will be minted for `to`. * - When `to` is zero, ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * - `batchSize` is non-zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256, /* firstTokenId */ uint256 batchSize ) internal virtual { if (batchSize > 1) { if (from != address(0)) { _balances[from] -= batchSize; } if (to != address(0)) { _balances[to] += batchSize; } } } /** * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`. * - When `from` is zero, the tokens were minted for `to`. * - When `to` is zero, ``from``'s tokens were burned. * - `from` and `to` are never both zero. * - `batchSize` is non-zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 firstTokenId, uint256 batchSize ) internal virtual {} }
{ "optimizer": { "enabled": false, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": { "contracts/libraries/ChecksArt.sol": { "ChecksArt": "0x3bcbf1480879bff8435b1534c70b4a5182fb2466" }, "contracts/libraries/ChecksMetadata.sol": { "ChecksMetadata": "0x4924c4f2b2514557488a78df410369094b719dac" } } }
Contract Security Audit
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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"BlackCheck__InvalidCheck","type":"error"},{"inputs":[],"name":"ERC721__InvalidApproval","type":"error"},{"inputs":[],"name":"ERC721__InvalidOwner","type":"error"},{"inputs":[],"name":"ERC721__InvalidToken","type":"error"},{"inputs":[],"name":"ERC721__NotAllowed","type":"error"},{"inputs":[],"name":"ERC721__TokenExists","type":"error"},{"inputs":[],"name":"ERC721__TransferToNonReceiver","type":"error"},{"inputs":[],"name":"ERC721__TransferToZero","type":"error"},{"inputs":[],"name":"InvalidTokenCount","type":"error"},{"inputs":[],"name":"NotAllowed","type":"error"},{"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":"uint256","name":"tokenId","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"burnedId","type":"uint256"},{"indexed":true,"internalType":"uint8","name":"checks","type":"uint8"}],"name":"Composite","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":true,"internalType":"uint256[]","name":"burnedIds","type":"uint256[]"}],"name":"Infinity","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"MetadataUpdate","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"epoch","type":"uint256"},{"indexed":true,"internalType":"uint64","name":"revealBlock","type":"uint64"}],"name":"NewEpoch","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"burnedId","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Sacrifice","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":"uint256","name":"tokenId","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"colors","outputs":[{"internalType":"string[]","name":"","type":"string[]"},{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"burnId","type":"uint256"},{"internalType":"bool","name":"swap","type":"bool"}],"name":"composite","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"tokenIds","type":"uint256[]"},{"internalType":"uint256[]","name":"burnIds","type":"uint256[]"}],"name":"compositeMany","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"editionChecks","outputs":[{"internalType":"contract IChecksEdition","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":"uint256","name":"tokenId","type":"uint256"}],"name":"getCheck","outputs":[{"components":[{"components":[{"internalType":"uint16[6]","name":"composites","type":"uint16[6]"},{"internalType":"uint8[5]","name":"colorBands","type":"uint8[5]"},{"internalType":"uint8[5]","name":"gradients","type":"uint8[5]"},{"internalType":"uint8","name":"divisorIndex","type":"uint8"},{"internalType":"uint32","name":"epoch","type":"uint32"},{"internalType":"uint16","name":"seed","type":"uint16"},{"internalType":"uint24","name":"day","type":"uint24"}],"internalType":"struct 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IChecks.StoredCheck","name":"stored","type":"tuple"},{"internalType":"bool","name":"isRevealed","type":"bool"},{"internalType":"uint256","name":"seed","type":"uint256"},{"internalType":"uint8","name":"checksCount","type":"uint8"},{"internalType":"bool","name":"hasManyChecks","type":"bool"},{"internalType":"uint16","name":"composite","type":"uint16"},{"internalType":"bool","name":"isRoot","type":"bool"},{"internalType":"uint8","name":"colorBand","type":"uint8"},{"internalType":"uint8","name":"gradient","type":"uint8"},{"internalType":"uint8","name":"direction","type":"uint8"},{"internalType":"uint8","name":"speed","type":"uint8"}],"internalType":"struct IChecks.Check","name":"check","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"burnId","type":"uint256"}],"name":"simulateCompositeSVG","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"svg","outputs":[{"internalType":"string","name":"","type":"string"}],"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"}]
Contract Creation Code
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