ERC-721
Overview
Max Total Supply
50 BGCG
Holders
27
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
1 BGCGLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Minimal Proxy Contract for 0xb7d20474fe31272a5794049d5d6057ee29ca04ec
Contract Name:
ChocoMintERC721
Compiler Version
v0.8.0+commit.c7dfd78e
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../utils/MintERC721Lib.sol"; import "../utils/SecurityLib.sol"; import "./ChocoMintERC721Base.sol"; contract ChocoMintERC721 is IChocoMintERC721, ChocoMintERC721Base { constructor( string memory name, string memory version, string memory symbol, address trustedForwarder, address[] memory defaultApprovals ) { initialize(name, version, symbol, trustedForwarder, defaultApprovals); } function mint(MintERC721Lib.MintERC721Data memory mintERC721Data, SignatureLib.SignatureData memory signatureData) external override { bytes32 mintERC721Hash = MintERC721Lib.hashStruct(mintERC721Data); (bool isSignatureValid, string memory signatureErrorMessage) = _validateTx( mintERC721Data.minter, mintERC721Hash, signatureData ); require(isSignatureValid, signatureErrorMessage); _mint(mintERC721Hash, mintERC721Data); } function isMinted(uint256 tokenId) external view override returns (bool) { return _exists(tokenId); } function _mint(bytes32 mintERC721Hash, MintERC721Lib.MintERC721Data memory mintERC721Data) internal { (bool isValid, string memory errorMessage) = _validate(mintERC721Data); require(isValid, errorMessage); _revokeHash(mintERC721Hash); super._mint(mintERC721Data.to, mintERC721Data.tokenId); if (mintERC721Data.data.length > 0) { ( string memory tokenStaticURI, bool tokenStaticURIFreezing, RoyaltyLib.RoyaltyData memory tokenRoyaltyData, bool tokenRoyaltyFreezing ) = abi.decode(mintERC721Data.data, (string, bool, RoyaltyLib.RoyaltyData, bool)); if (bytes(tokenStaticURI).length > 0) { _setTokenStaticURI(mintERC721Data.tokenId, tokenStaticURI, tokenStaticURIFreezing); } if (RoyaltyLib.isNotNull(tokenRoyaltyData)) { _setTokenRoyalty(mintERC721Data.tokenId, tokenRoyaltyData, tokenRoyaltyFreezing); } } emit Minted(mintERC721Hash); } function _validate(MintERC721Lib.MintERC721Data memory mintERC721Data) internal view returns (bool, string memory) { (bool isMinterValid, string memory minterErrorMessage) = _validateAdminOrOwner(mintERC721Data.minter); if (!isMinterValid) { return (false, minterErrorMessage); } (bool isSecurityDataValid, string memory securityDataErrorMessage) = SecurityLib.validate( mintERC721Data.securityData ); if (!isSecurityDataValid) { return (false, securityDataErrorMessage); } return (true, ""); } // solhint-disable-next-line ordering uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./SecurityLib.sol"; import "./SignatureLib.sol"; library MintERC721Lib { struct MintERC721Data { SecurityLib.SecurityData securityData; address minter; address to; uint256 tokenId; bytes data; } bytes32 private constant _MINT_ERC721_TYPEHASH = keccak256( bytes( "MintERC721Data(SecurityData securityData,address minter,address to,uint256 tokenId,bytes data)SecurityData(uint256 validFrom,uint256 validTo,uint256 salt)" ) ); function hashStruct(MintERC721Data memory mintERC721Data) internal pure returns (bytes32) { return keccak256( abi.encode( _MINT_ERC721_TYPEHASH, SecurityLib.hashStruct(mintERC721Data.securityData), mintERC721Data.minter, mintERC721Data.to, mintERC721Data.tokenId, keccak256(mintERC721Data.data) ) ); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; library SecurityLib { struct SecurityData { uint256 validFrom; uint256 validTo; uint256 salt; } bytes32 private constant _SECURITY_TYPEHASH = keccak256(abi.encodePacked("SecurityData(uint256 validFrom,uint256 validTo,uint256 salt)")); function validate(SecurityData memory securityData) internal view returns (bool, string memory) { if (securityData.validFrom > block.timestamp) { return (false, "SecurityLib: valid from verification failed"); } if (securityData.validTo < block.timestamp) { return (false, "SecurityLib: valid to verification failed"); } return (true, ""); } function hashStruct(SecurityData memory securityData) internal pure returns (bytes32) { return keccak256(abi.encode(_SECURITY_TYPEHASH, securityData.validFrom, securityData.validTo, securityData.salt)); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts-upgradeable/metatx/ERC2771ContextUpgradeable.sol"; import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol"; import "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol"; import "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/ERC721BurnableUpgradeable.sol"; import "@openzeppelin/contracts-upgradeable/utils/introspection/ERC165Upgradeable.sol"; import "@openzeppelin/contracts-upgradeable/utils/cryptography/draft-EIP712Upgradeable.sol"; import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol"; import "../interfaces/IChocoMintERC721.sol"; import "../utils/AdminController.sol"; import "../utils/DefaultApproval.sol"; import "../utils/FreezableProvenance.sol"; import "../utils/FreezableRoot.sol"; import "../utils/FreezableTokenURI.sol"; import "../utils/FreezableRoyalty.sol"; import "../utils/TotalSupply.sol"; import "../utils/TxValidatable.sol"; abstract contract ChocoMintERC721Base is Initializable, ContextUpgradeable, EIP712Upgradeable, ERC2771ContextUpgradeable, ERC721Upgradeable, ERC721BurnableUpgradeable, AdminController, DefaultApproval, FreezableProvenance, FreezableRoot, FreezableTokenURI, FreezableRoyalty, TotalSupply, TxValidatable { function freezeProvenance() external onlyAdminOrOwner { _freezeProvenance(); } function setProvenance(string memory _provenance, bool freezing) external onlyAdminOrOwner { _setProvenance(_provenance, freezing); } function freezeRoot() external onlyAdminOrOwner { _freezeRoot(); } function setRoot(bytes32 _root, bool freezing) external onlyAdminOrOwner { _setRoot(_root, freezing); } function freezeTokenURI() external onlyAdminOrOwner { _freezeAllTokenStaticURI(); _freezeTokenURIBase(); } function freezeAllTokenStaticURI() external onlyAdminOrOwner { _freezeAllTokenStaticURI(); } function freezeTokenStaticURI(uint256 tokenId) external onlyAdminOrOwner { _freezeTokenStaticURI(tokenId); } function freezeTokenURIBase() external onlyAdminOrOwner { _freezeTokenURIBase(); } function setTokenStaticURI( uint256 tokenId, string memory tokenStaticURI, bool freezing ) external onlyAdminOrOwner { _setTokenStaticURI(tokenId, tokenStaticURI, freezing); } function setTokenURIBase(string memory tokenURIBase, bool freezing) external onlyAdminOrOwner { _setTokenURIBase(tokenURIBase, freezing); } function freezeRoyalty() external onlyAdminOrOwner { _freezeAllTokenRoyalty(); _freezeDefaultRoyalty(); } function freezeAllTokenRoyalty() external onlyAdminOrOwner { _freezeAllTokenRoyalty(); } function freezeDefaultRoyalty() external onlyAdminOrOwner { _freezeDefaultRoyalty(); } function freezeTokenRoyalty(uint256 tokenId) external onlyAdminOrOwner { _freezeTokenRoyalty(tokenId); } function setTokenRoyalty( uint256 tokenId, RoyaltyLib.RoyaltyData memory royaltyData, bool freezing ) external onlyAdminOrOwner { _setTokenRoyalty(tokenId, royaltyData, freezing); } function setDefaultRoyalty(RoyaltyLib.RoyaltyData memory royaltyData, bool freezing) external onlyAdminOrOwner { _setDefaultRoyalty(royaltyData, freezing); } function initialize( string memory name, string memory version, string memory symbol, address trustedForwarder, address[] memory defaultApprovals ) public initializer { __Ownable_init_unchained(); __EIP712_init_unchained(name, version); __ERC721_init_unchained(name, symbol); __ERC2771Context_init_unchained(trustedForwarder); for (uint256 i = 0; i < defaultApprovals.length; i++) { _setDefaultApproval(defaultApprovals[i], true); } } function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721Upgradeable, FreezableRoyalty) returns (bool) { return interfaceId == type(IChocoMintERC721).interfaceId || super.supportsInterface(interfaceId); } function isApprovedForAll(address owner, address operator) public view virtual override(ERC721Upgradeable, DefaultApproval) returns (bool) { return super.isApprovedForAll(owner, operator); } function tokenURI(uint256 tokenId) public view override(ERC721Upgradeable, FreezableTokenURI) returns (string memory) { return super.tokenURI(tokenId); } function _mint(address to, uint256 tokenId) internal virtual override(ERC721Upgradeable, TotalSupply) { super._mint(to, tokenId); } function _burn(uint256 tokenId) internal virtual override(ERC721Upgradeable, FreezableRoyalty, FreezableTokenURI, TotalSupply) { super._burn(tokenId); } function _msgSender() internal view override(ContextUpgradeable, ERC2771ContextUpgradeable) returns (address) { return super._msgSender(); } function _msgData() internal view override(ContextUpgradeable, ERC2771ContextUpgradeable) returns (bytes memory) { return super._msgData(); } function _baseURI() internal view virtual override(ERC721Upgradeable, FreezableTokenURI) returns (string memory) { return super._baseURI(); } function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual override(ERC721Upgradeable, DefaultApproval) returns (bool) { return super._isApprovedOrOwner(spender, tokenId); } // solhint-disable-next-line ordering uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; library SignatureLib { struct SignatureData { bytes32 root; bytes32[] proof; bytes signature; } bytes32 private constant _SIGNATURE_DATA_TYPEHASH = keccak256(bytes("SignatureData(bytes32 root)")); function hashStruct(SignatureData memory signatureData) internal pure returns (bytes32) { return keccak256(abi.encode(_SIGNATURE_DATA_TYPEHASH, signatureData.root)); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../utils/ContextUpgradeable.sol"; import "../proxy/utils/Initializable.sol"; /** * @dev Context variant with ERC2771 support. */ abstract contract ERC2771ContextUpgradeable is Initializable, ContextUpgradeable { address private _trustedForwarder; function __ERC2771Context_init(address trustedForwarder) internal initializer { __Context_init_unchained(); __ERC2771Context_init_unchained(trustedForwarder); } function __ERC2771Context_init_unchained(address trustedForwarder) internal initializer { _trustedForwarder = trustedForwarder; } function isTrustedForwarder(address forwarder) public view virtual returns (bool) { return forwarder == _trustedForwarder; } function _msgSender() internal view virtual override returns (address sender) { if (isTrustedForwarder(msg.sender)) { // The assembly code is more direct than the Solidity version using `abi.decode`. assembly { sender := shr(96, calldataload(sub(calldatasize(), 20))) } } else { return super._msgSender(); } } function _msgData() internal view virtual override returns (bytes calldata) { if (isTrustedForwarder(msg.sender)) { return msg.data[:msg.data.length - 20]; } else { return super._msgData(); } } uint256[49] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. * * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}. * * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity. */ abstract contract Initializable { /** * @dev Indicates that the contract has been initialized. */ bool private _initialized; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private _initializing; /** * @dev Modifier to protect an initializer function from being invoked twice. */ modifier initializer() { require(_initializing || !_initialized, "Initializable: contract is already initialized"); bool isTopLevelCall = !_initializing; if (isTopLevelCall) { _initializing = true; _initialized = true; } _; if (isTopLevelCall) { _initializing = false; } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC721Upgradeable.sol"; import "./IERC721ReceiverUpgradeable.sol"; import "./extensions/IERC721MetadataUpgradeable.sol"; import "../../utils/AddressUpgradeable.sol"; import "../../utils/ContextUpgradeable.sol"; import "../../utils/StringsUpgradeable.sol"; import "../../utils/introspection/ERC165Upgradeable.sol"; import "../../proxy/utils/Initializable.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 ERC721Upgradeable is Initializable, ContextUpgradeable, ERC165Upgradeable, IERC721Upgradeable, IERC721MetadataUpgradeable { using AddressUpgradeable for address; using StringsUpgradeable 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. */ function __ERC721_init(string memory name_, string memory symbol_) internal initializer { __Context_init_unchained(); __ERC165_init_unchained(); __ERC721_init_unchained(name_, symbol_); } function __ERC721_init_unchained(string memory name_, string memory symbol_) internal initializer { _name = name_; _symbol = symbol_; } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165Upgradeable, IERC165Upgradeable) returns (bool) { return interfaceId == type(IERC721Upgradeable).interfaceId || interfaceId == type(IERC721MetadataUpgradeable).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721-balanceOf}. */ function balanceOf(address owner) public view virtual override returns (uint256) { require(owner != address(0), "ERC721: balance query for the zero address"); return _balances[owner]; } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { address owner = _owners[tokenId]; require(owner != address(0), "ERC721: owner query for nonexistent token"); return owner; } /** * @dev See {IERC721Metadata-name}. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev See {IERC721Metadata-symbol}. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev See {IERC721Metadata-tokenURI}. */ function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token"); string memory baseURI = _baseURI(); return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : ""; } /** * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each * token will be the concatenation of the `baseURI` and the `tokenId`. Empty * by default, can be overriden in child contracts. */ function _baseURI() internal view virtual returns (string memory) { return ""; } /** * @dev See {IERC721-approve}. */ function approve(address to, uint256 tokenId) public virtual override { address owner = ERC721Upgradeable.ownerOf(tokenId); require(to != owner, "ERC721: approval to current owner"); require( _msgSender() == owner || isApprovedForAll(owner, _msgSender()), "ERC721: approve caller is not owner nor approved for all" ); _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { require(_exists(tokenId), "ERC721: approved query for nonexistent token"); return _tokenApprovals[tokenId]; } /** * @dev See {IERC721-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual override { require(operator != _msgSender(), "ERC721: approve to caller"); _operatorApprovals[_msgSender()][operator] = approved; emit ApprovalForAll(_msgSender(), operator, approved); } /** * @dev See {IERC721-isApprovedForAll}. */ function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) { return _operatorApprovals[owner][operator]; } /** * @dev See {IERC721-transferFrom}. */ function transferFrom( address from, address to, uint256 tokenId ) public virtual override { //solhint-disable-next-line max-line-length require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); _transfer(from, to, tokenId); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId ) public virtual override { safeTransferFrom(from, to, tokenId, ""); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes memory _data ) public virtual override { require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); _safeTransfer(from, to, tokenId, _data); } /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * `_data` is additional data, it has no specified format and it is sent in call to `to`. * * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g. * implement alternative mechanisms to perform token transfer, such as signature-based. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeTransfer( address from, address to, uint256 tokenId, bytes memory _data ) internal virtual { _transfer(from, to, tokenId); require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer"); } /** * @dev Returns whether `tokenId` exists. * * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}. * * Tokens start existing when they are minted (`_mint`), * and stop existing when they are burned (`_burn`). */ function _exists(uint256 tokenId) internal view virtual returns (bool) { return _owners[tokenId] != address(0); } /** * @dev Returns whether `spender` is allowed to manage `tokenId`. * * Requirements: * * - `tokenId` must exist. */ function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) { require(_exists(tokenId), "ERC721: operator query for nonexistent token"); address owner = ERC721Upgradeable.ownerOf(tokenId); return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender)); } /** * @dev Safely mints `tokenId` and transfers it to `to`. * * Requirements: * * - `tokenId` must not exist. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeMint(address to, uint256 tokenId) internal virtual { _safeMint(to, tokenId, ""); } /** * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is * forwarded in {IERC721Receiver-onERC721Received} to contract recipients. */ function _safeMint( address to, uint256 tokenId, bytes memory _data ) internal virtual { _mint(to, tokenId); require( _checkOnERC721Received(address(0), to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer" ); } /** * @dev Mints `tokenId` and transfers it to `to`. * * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible * * Requirements: * * - `tokenId` must not exist. * - `to` cannot be the zero address. * * Emits a {Transfer} event. */ function _mint(address to, uint256 tokenId) internal virtual { require(to != address(0), "ERC721: mint to the zero address"); require(!_exists(tokenId), "ERC721: token already minted"); _beforeTokenTransfer(address(0), to, tokenId); _balances[to] += 1; _owners[tokenId] = to; emit Transfer(address(0), to, tokenId); } /** * @dev Destroys `tokenId`. * The approval is cleared when the token is burned. * * Requirements: * * - `tokenId` must exist. * * Emits a {Transfer} event. */ function _burn(uint256 tokenId) internal virtual { address owner = ERC721Upgradeable.ownerOf(tokenId); _beforeTokenTransfer(owner, address(0), tokenId); // Clear approvals _approve(address(0), tokenId); _balances[owner] -= 1; delete _owners[tokenId]; emit Transfer(owner, address(0), tokenId); } /** * @dev Transfers `tokenId` from `from` to `to`. * As opposed to {transferFrom}, this imposes no restrictions on msg.sender. * * Requirements: * * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * * Emits a {Transfer} event. */ function _transfer( address from, address to, uint256 tokenId ) internal virtual { require(ERC721Upgradeable.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own"); require(to != address(0), "ERC721: transfer to the zero address"); _beforeTokenTransfer(from, to, tokenId); // Clear approvals from the previous owner _approve(address(0), tokenId); _balances[from] -= 1; _balances[to] += 1; _owners[tokenId] = to; emit Transfer(from, to, tokenId); } /** * @dev Approve `to` to operate on `tokenId` * * Emits a {Approval} event. */ function _approve(address to, uint256 tokenId) internal virtual { _tokenApprovals[tokenId] = to; emit Approval(ERC721Upgradeable.ownerOf(tokenId), to, tokenId); } /** * @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 IERC721ReceiverUpgradeable(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) { return retval == IERC721ReceiverUpgradeable.onERC721Received.selector; } catch (bytes memory reason) { if (reason.length == 0) { revert("ERC721: transfer to non ERC721Receiver implementer"); } else { assembly { revert(add(32, reason), mload(reason)) } } } } else { return true; } } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal virtual {} uint256[44] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../ERC721Upgradeable.sol"; import "../../../utils/ContextUpgradeable.sol"; import "../../../proxy/utils/Initializable.sol"; /** * @title ERC721 Burnable Token * @dev ERC721 Token that can be irreversibly burned (destroyed). */ abstract contract ERC721BurnableUpgradeable is Initializable, ContextUpgradeable, ERC721Upgradeable { function __ERC721Burnable_init() internal initializer { __Context_init_unchained(); __ERC165_init_unchained(); __ERC721Burnable_init_unchained(); } function __ERC721Burnable_init_unchained() internal initializer { } /** * @dev Burns `tokenId`. See {ERC721-_burn}. * * Requirements: * * - The caller must own `tokenId` or be an approved operator. */ function burn(uint256 tokenId) public virtual { //solhint-disable-next-line max-line-length require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721Burnable: caller is not owner nor approved"); _burn(tokenId); } uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC165Upgradeable.sol"; import "../../proxy/utils/Initializable.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 ERC165Upgradeable is Initializable, IERC165Upgradeable { function __ERC165_init() internal initializer { __ERC165_init_unchained(); } function __ERC165_init_unchained() internal initializer { } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IERC165Upgradeable).interfaceId; } uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./ECDSAUpgradeable.sol"; import "../../proxy/utils/Initializable.sol"; /** * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data. * * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible, * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding * they need in their contracts using a combination of `abi.encode` and `keccak256`. * * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA * ({_hashTypedDataV4}). * * The implementation of the domain separator was designed to be as efficient as possible while still properly updating * the chain id to protect against replay attacks on an eventual fork of the chain. * * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask]. * * _Available since v3.4._ */ abstract contract EIP712Upgradeable is Initializable { /* solhint-disable var-name-mixedcase */ bytes32 private _HASHED_NAME; bytes32 private _HASHED_VERSION; bytes32 private constant _TYPE_HASH = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"); /* solhint-enable var-name-mixedcase */ /** * @dev Initializes the domain separator and parameter caches. * * The meaning of `name` and `version` is specified in * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]: * * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol. * - `version`: the current major version of the signing domain. * * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart * contract upgrade]. */ function __EIP712_init(string memory name, string memory version) internal initializer { __EIP712_init_unchained(name, version); } function __EIP712_init_unchained(string memory name, string memory version) internal initializer { bytes32 hashedName = keccak256(bytes(name)); bytes32 hashedVersion = keccak256(bytes(version)); _HASHED_NAME = hashedName; _HASHED_VERSION = hashedVersion; } /** * @dev Returns the domain separator for the current chain. */ function _domainSeparatorV4() internal view returns (bytes32) { return _buildDomainSeparator(_TYPE_HASH, _EIP712NameHash(), _EIP712VersionHash()); } function _buildDomainSeparator( bytes32 typeHash, bytes32 nameHash, bytes32 versionHash ) private view returns (bytes32) { return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this))); } /** * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this * function returns the hash of the fully encoded EIP712 message for this domain. * * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example: * * ```solidity * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode( * keccak256("Mail(address to,string contents)"), * mailTo, * keccak256(bytes(mailContents)) * ))); * address signer = ECDSA.recover(digest, signature); * ``` */ function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) { return ECDSAUpgradeable.toTypedDataHash(_domainSeparatorV4(), structHash); } /** * @dev The hash of the name parameter for the EIP712 domain. * * NOTE: This function reads from storage by default, but can be redefined to return a constant value if gas costs * are a concern. */ function _EIP712NameHash() internal virtual view returns (bytes32) { return _HASHED_NAME; } /** * @dev The hash of the version parameter for the EIP712 domain. * * NOTE: This function reads from storage by default, but can be redefined to return a constant value if gas costs * are a concern. */ function _EIP712VersionHash() internal virtual view returns (bytes32) { return _HASHED_VERSION; } uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../proxy/utils/Initializable.sol"; /** * @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 ContextUpgradeable is Initializable { function __Context_init() internal initializer { __Context_init_unchained(); } function __Context_init_unchained() internal initializer { } function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../utils/MintERC721Lib.sol"; import "../utils/SignatureLib.sol"; interface IChocoMintERC721 { event Minted(bytes32 indexed mintERC721Hash); function mint(MintERC721Lib.MintERC721Data memory mintERC721Data, SignatureLib.SignatureData memory signatureData) external; function isMinted(uint256 tokenId) external view returns (bool); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol"; import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol"; abstract contract AdminController is ContextUpgradeable, OwnableUpgradeable { mapping(address => bool) private _admins; event AdminSet(address indexed account, bool indexed status); modifier onlyAdmin() { address sender = _msgSender(); (bool isAdminValid, string memory errorAdminMessage) = _validateAdmin(sender); require(isAdminValid, errorAdminMessage); _; } modifier onlyAdminOrOwner() { address sender = _msgSender(); (bool isAdminValid, string memory errorAdminMessage) = _validateAdminOrOwner(sender); require(isAdminValid, errorAdminMessage); _; } function setAdmin(address account, bool status) external onlyOwner { _setAdmin(account, status); } function renounceAdmin() external onlyAdmin { address sender = _msgSender(); _setAdmin(sender, false); } function _setAdmin(address account, bool status) internal { require(_admins[account] != status, "AdminController: admin already set"); _admins[account] = status; emit AdminSet(account, status); } function _isAdmin(address account) internal view returns (bool) { return _admins[account]; } function _isAdminOrOwner(address account) internal view returns (bool) { return owner() == account || _isAdmin(account); } function _validateAdmin(address account) internal view returns (bool, string memory) { if (!_isAdmin(account)) { return (false, "AdminController: admin verification failed"); } return (true, ""); } function _validateAdminOrOwner(address account) internal view returns (bool, string memory) { if (!_isAdminOrOwner(account)) { return (false, "AdminController: admin or owner verification failed"); } return (true, ""); } // solhint-disable-next-line ordering uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol"; abstract contract DefaultApproval is ERC721Upgradeable { mapping(address => bool) private _defaultApprovals; event DefaultApprovalSet(address indexed operator, bool indexed status); function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) { return _defaultApprovals[operator] || super.isApprovedForAll(owner, operator); } function _setDefaultApproval(address operator, bool status) internal { require(_defaultApprovals[operator] != status, "DefaultApproval: default approval already set"); _defaultApprovals[operator] = status; emit DefaultApprovalSet(operator, status); } function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual override returns (bool) { return _defaultApprovals[spender] || super._isApprovedOrOwner(spender, tokenId); } // solhint-disable-next-line ordering uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; abstract contract FreezableProvenance { string private _provenance; bool private _isProvenanceFreezed; event ProvenanceFreezed(); event ProvenanceSet(string provenance); modifier whenNotProvenanceFreezed() { require(!_isProvenanceFreezed, "FreezableProvenance: provenance already freezed"); _; } function provenance() public view returns (string memory) { return _provenance; } function _freezeProvenance() internal whenNotProvenanceFreezed { _isProvenanceFreezed = true; emit ProvenanceFreezed(); } function _setProvenance(string memory provenance_, bool freezing) internal whenNotProvenanceFreezed { _provenance = provenance_; emit ProvenanceSet(provenance_); if (freezing) { _freezeProvenance(); } } // solhint-disable-next-line ordering uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; abstract contract FreezableRoot { bytes32 private _root; bool private _isRootFreezed; event RootFreezed(); event RootSet(bytes32 root); modifier whenNotRootFreezed() { require(!_isRootFreezed, "FreezableRoot: root already freezed"); _; } function root() public view returns (bytes32) { return _root; } function _freezeRoot() internal whenNotRootFreezed { _isRootFreezed = true; emit RootFreezed(); } function _setRoot(bytes32 root_, bool freezing) internal whenNotRootFreezed { _root = root_; emit RootSet(root_); if (freezing) { _freezeRoot(); } } function _validateRoot(bytes32 root_) internal view returns (bool, string memory) { if (_root != bytes32(0x0) && _root != root_) { return (false, "FreezableRoot: root verification failed"); } return (true, ""); } // solhint-disable-next-line ordering uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol"; abstract contract FreezableTokenURI is ERC721Upgradeable { mapping(uint256 => string) private _tokenStaticURIs; mapping(uint256 => bool) private _isTokenStaticURIFreezed; bool private _isAllTokenStaticURIFreezed; bool private _isTokenURIBaseFreezed; string private _tokenURIBase; event AllTokenStaticURIFreezed(); event TokenStaticURIFreezed(uint256 tokenId); event TokenStaticURIDefrosted(uint256 tokenId); event TokenStaticURISet(uint256 indexed tokenId, string tokenStaticURI); event TokenURIBaseFreezed(); event TokenURIBaseSet(string tokenURIBase); modifier whenNotAllTokenStaticURIFreezed() { require(!_isAllTokenStaticURIFreezed, "FreezableTokenURI: all token static URI already freezed"); _; } modifier whenNotTokenStaticURIFreezed(uint256 tokenId) { require(!_isTokenStaticURIFreezed[tokenId], "FreezableTokenURI: token static URI already freezed"); _; } modifier whenNotTokenURIBaseFreezed() { require(!_isTokenURIBaseFreezed, "FreezableTokenURI: token URI base already freezed"); _; } function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { require(_exists(tokenId), "FreezableTokenURI: URI query for nonexistent token"); string memory _tokenStaticURI = _tokenStaticURIs[tokenId]; if (bytes(_tokenStaticURI).length > 0) { return _tokenStaticURI; } return super.tokenURI(tokenId); } function _freezeAllTokenStaticURI() internal whenNotAllTokenStaticURIFreezed { _isAllTokenStaticURIFreezed = true; emit AllTokenStaticURIFreezed(); } function _freezeTokenStaticURI(uint256 tokenId) internal whenNotAllTokenStaticURIFreezed whenNotTokenStaticURIFreezed(tokenId) { require(_exists(tokenId), "FreezableTokenURI: URI freeze for nonexistent token"); _isTokenStaticURIFreezed[tokenId] = true; emit TokenStaticURIFreezed(tokenId); } function _setTokenStaticURI( uint256 tokenId, string memory _tokenStaticURI, bool freezing ) internal whenNotAllTokenStaticURIFreezed whenNotTokenStaticURIFreezed(tokenId) { require(_exists(tokenId), "FreezableTokenURI: URI set for nonexistent token"); _tokenStaticURIs[tokenId] = _tokenStaticURI; emit TokenStaticURISet(tokenId, string(_tokenStaticURI)); if (freezing) { _freezeTokenStaticURI(tokenId); } } function _freezeTokenURIBase() internal whenNotTokenURIBaseFreezed { _isTokenURIBaseFreezed = true; emit TokenURIBaseFreezed(); } function _setTokenURIBase(string memory tokenURIBase, bool freezing) internal whenNotTokenURIBaseFreezed { _tokenURIBase = tokenURIBase; emit TokenURIBaseSet(tokenURIBase); if (freezing) { _freezeTokenURIBase(); } } function _burn(uint256 tokenId) internal virtual override { super._burn(tokenId); if (bytes(_tokenStaticURIs[tokenId]).length > 0) { delete _tokenStaticURIs[tokenId]; emit TokenStaticURISet(tokenId, ""); if (_isTokenStaticURIFreezed[tokenId]) { _isTokenStaticURIFreezed[tokenId] = false; emit TokenStaticURIDefrosted(tokenId); } } } function _baseURI() internal view virtual override returns (string memory) { return _tokenURIBase; } // solhint-disable-next-line ordering uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol"; import "../interfaces/IERC2981.sol"; import "./RoyaltyLib.sol"; contract FreezableRoyalty is ERC721Upgradeable, IERC2981 { mapping(uint256 => RoyaltyLib.RoyaltyData) private _tokenRoyalties; mapping(uint256 => bool) private _isTokenRoyaltyFreezed; RoyaltyLib.RoyaltyData private _defaultRoyalty; bool private _isAllTokenRoyaltyFreezed; bool private _isDefaultRoyaltyFreezed; event AllTokenRoyaltyFreezed(); event TokenRoyaltyFreezed(uint256 tokenId); event TokenRoyaltyDefrosted(uint256 tokenId); event TokenRoyaltySet(uint256 tokenId, address recipient, uint256 bps); event DefaultRoyaltyFreezed(); event DefaultRoyaltySet(address recipient, uint256 bps); modifier requireValidRoyalty(RoyaltyLib.RoyaltyData memory royaltyData) { (bool isValid, string memory errorMessage) = RoyaltyLib.validate(royaltyData); require(isValid, errorMessage); _; } modifier whenNotAllTokenRoyaltyFreezed() { require(!_isAllTokenRoyaltyFreezed, "FreezableRoyalty: all token royalty already freezed"); _; } modifier whenNotTokenRoyaltyFreezed(uint256 tokenId) { require(!_isTokenRoyaltyFreezed[tokenId], "FreezableRoyalty: token royalty already freezed"); _; } modifier whenNotDefaultRoyaltyFreezed() { require(!_isDefaultRoyaltyFreezed, "FreezableRoyalty: default royalty already freezed"); _; } function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IERC2981).interfaceId || super.supportsInterface(interfaceId); } function royaltyInfo(uint256 tokenId, uint256 salePrice) public view override returns (address, uint256) { require(_exists(tokenId), "FreezableRoyalty: royalty query for nonexistent token"); if (RoyaltyLib.isNotNull(_tokenRoyalties[tokenId])) { return (_tokenRoyalties[tokenId].recipient, RoyaltyLib.calc(salePrice, _tokenRoyalties[tokenId].bps)); } if (RoyaltyLib.isNotNull(_defaultRoyalty)) { return (_defaultRoyalty.recipient, RoyaltyLib.calc(salePrice, _defaultRoyalty.bps)); } return (address(0x0), 0); } function _freezeAllTokenRoyalty() internal whenNotAllTokenRoyaltyFreezed { _isAllTokenRoyaltyFreezed = true; emit AllTokenRoyaltyFreezed(); } function _freezeTokenRoyalty(uint256 tokenId) internal whenNotAllTokenRoyaltyFreezed whenNotTokenRoyaltyFreezed(tokenId) { require(_exists(tokenId), "FreezableRoyalty: royalty freeze for nonexistent token"); _isTokenRoyaltyFreezed[tokenId] = true; emit TokenRoyaltyFreezed(tokenId); } function _freezeDefaultRoyalty() internal whenNotDefaultRoyaltyFreezed { _isDefaultRoyaltyFreezed = true; emit DefaultRoyaltyFreezed(); } function _setTokenRoyalty( uint256 tokenId, RoyaltyLib.RoyaltyData memory royaltyData, bool freezing ) internal whenNotAllTokenRoyaltyFreezed whenNotTokenRoyaltyFreezed(tokenId) requireValidRoyalty(royaltyData) { require(_exists(tokenId), "FreezableRoyalty: royalty set for nonexistent token"); _tokenRoyalties[tokenId] = royaltyData; emit TokenRoyaltySet(tokenId, royaltyData.recipient, royaltyData.bps); if (freezing) { _freezeTokenRoyalty(tokenId); } } function _setDefaultRoyalty(RoyaltyLib.RoyaltyData memory royaltyData, bool freezing) internal whenNotDefaultRoyaltyFreezed requireValidRoyalty(royaltyData) { _defaultRoyalty = royaltyData; emit DefaultRoyaltySet(royaltyData.recipient, royaltyData.bps); if (freezing) { _freezeDefaultRoyalty(); } } function _burn(uint256 tokenId) internal virtual override { super._burn(tokenId); if (RoyaltyLib.isNotNull(_tokenRoyalties[tokenId])) { delete _tokenRoyalties[tokenId]; emit TokenRoyaltySet(tokenId, address(0x0), 0); if (_isTokenRoyaltyFreezed[tokenId]) { _isTokenRoyaltyFreezed[tokenId] = false; emit TokenRoyaltyDefrosted(tokenId); } } } // solhint-disable-next-line ordering uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol"; abstract contract TotalSupply is ERC721Upgradeable { uint256 private _totalSupply; function totalSupply() public view returns (uint256) { return _totalSupply; } function _mint(address to, uint256 tokenId) internal virtual override { super._mint(to, tokenId); _totalSupply++; } function _burn(uint256 tokenId) internal virtual override { super._burn(tokenId); _totalSupply--; } // solhint-disable-next-line ordering uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts-upgradeable/utils/cryptography/draft-EIP712Upgradeable.sol"; import "@openzeppelin/contracts-upgradeable/utils/cryptography/MerkleProofUpgradeable.sol"; import "@openzeppelin/contracts-upgradeable/utils/cryptography/SignatureCheckerUpgradeable.sol"; import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol"; import "./FreezableRoot.sol"; import "./Revocable.sol"; import "./SignatureLib.sol"; abstract contract TxValidatable is ContextUpgradeable, EIP712Upgradeable, FreezableRoot, Revocable { using MerkleProofUpgradeable for bytes32[]; using SignatureCheckerUpgradeable for address; function _validateTx( address signer, bytes32 hash, SignatureLib.SignatureData memory signatureData ) internal view returns (bool, string memory) { (bool isHashValid, string memory hashErrorMessage) = _validateHash(hash); if (!isHashValid) { return (false, hashErrorMessage); } (bool isRootValid, string memory rootErrorMessage) = _validateRoot(signatureData.root); if (!isRootValid) { return (false, rootErrorMessage); } if (!signatureData.proof.verify(signatureData.root, hash)) { return (false, "TxValidatable: proof verification failed"); } if (signatureData.signature.length == 0) { address sender = _msgSender(); if (signer != sender) { return (false, "TxValidatable: sender verification failed"); } } else { if ( !signer.isValidSignatureNow(_hashTypedDataV4(SignatureLib.hashStruct(signatureData)), signatureData.signature) ) { if (!signer.isValidSignatureNow(_hashTypedDataV4(hash), signatureData.signature)) { return (false, "TxValidatable: signature verification failed"); } } } return (true, ""); } // solhint-disable-next-line ordering uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../../utils/introspection/IERC165Upgradeable.sol"; /** * @dev Required interface of an ERC721 compliant contract. */ interface IERC721Upgradeable is IERC165Upgradeable { /** * @dev Emitted when `tokenId` token is transferred from `from` to `to`. */ event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token. */ event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets. */ event ApprovalForAll(address indexed owner, address indexed operator, bool approved); /** * @dev Returns the number of tokens in ``owner``'s account. */ function balanceOf(address owner) external view returns (uint256 balance); /** * @dev Returns the owner of the `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function ownerOf(uint256 tokenId) external view returns (address owner); /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Transfers `tokenId` token from `from` to `to`. * * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Gives permission to `to` to transfer `tokenId` token to another account. * The approval is cleared when the token is transferred. * * Only a single account can be approved at a time, so approving the zero address clears previous approvals. * * Requirements: * * - The caller must own the token or be an approved operator. * - `tokenId` must exist. * * Emits an {Approval} event. */ function approve(address to, uint256 tokenId) external; /** * @dev Returns the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @dev Approve or remove `operator` as an operator for the caller. * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller. * * Requirements: * * - The `operator` cannot be the caller. * * Emits an {ApprovalForAll} event. */ function setApprovalForAll(address operator, bool _approved) external; /** * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`. * * See {setApprovalForAll} */ function isApprovedForAll(address owner, address operator) external view returns (bool); /** * @dev Safely transfers `tokenId` token from `from` to `to`. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes calldata data ) external; }
// SPDX-License-Identifier: MIT 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 IERC721ReceiverUpgradeable { /** * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom} * by `operator` from `from`, this function is called. * * It must return its Solidity selector to confirm the token transfer. * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted. * * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`. */ function onERC721Received( address operator, address from, uint256 tokenId, bytes calldata data ) external returns (bytes4); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC721Upgradeable.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721MetadataUpgradeable is IERC721Upgradeable { /** * @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 pragma solidity ^0.8.0; /** * @dev Collection of functions related to the address type */ library AddressUpgradeable { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev String operations. */ library StringsUpgradeable { bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); while (value != 0) { digits -= 1; buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); value /= 10; } return string(buffer); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { if (value == 0) { return "0x00"; } uint256 temp = value; uint256 length = 0; while (temp != 0) { length++; temp >>= 8; } return toHexString(value, length); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _HEX_SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } }
// SPDX-License-Identifier: MIT 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 IERC165Upgradeable { /** * @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 pragma solidity ^0.8.0; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSAUpgradeable { enum RecoverError { NoError, InvalidSignature, InvalidSignatureLength, InvalidSignatureS, InvalidSignatureV } function _throwError(RecoverError error) private pure { if (error == RecoverError.NoError) { return; // no error: do nothing } else if (error == RecoverError.InvalidSignature) { revert("ECDSA: invalid signature"); } else if (error == RecoverError.InvalidSignatureLength) { revert("ECDSA: invalid signature length"); } else if (error == RecoverError.InvalidSignatureS) { revert("ECDSA: invalid signature 's' value"); } else if (error == RecoverError.InvalidSignatureV) { revert("ECDSA: invalid signature 'v' value"); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature` or error string. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] * * _Available since v4.3._ */ function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) { // Check the signature length // - case 65: r,s,v signature (standard) // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._ if (signature.length == 65) { bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return tryRecover(hash, v, r, s); } else if (signature.length == 64) { bytes32 r; bytes32 vs; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) vs := mload(add(signature, 0x40)) } return tryRecover(hash, r, vs); } else { return (address(0), RecoverError.InvalidSignatureLength); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, signature); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately. * * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures] * * _Available since v4.3._ */ function tryRecover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address, RecoverError) { bytes32 s; uint8 v; assembly { s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff) v := add(shr(255, vs), 27) } return tryRecover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately. * * _Available since v4.2._ */ function recover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, r, vs); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `v`, * `r` and `s` signature fields separately. * * _Available since v4.3._ */ function tryRecover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address, RecoverError) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) { return (address(0), RecoverError.InvalidSignatureS); } if (v != 27 && v != 28) { return (address(0), RecoverError.InvalidSignatureV); } // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); if (signer == address(0)) { return (address(0), RecoverError.InvalidSignature); } return (signer, RecoverError.NoError); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, * `r` and `s` signature fields separately. */ function recover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, v, r, s); _throwError(error); return recovered; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash)); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../utils/ContextUpgradeable.sol"; import "../proxy/utils/Initializable.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ function __Ownable_init() internal initializer { __Context_init_unchained(); __Ownable_init_unchained(); } function __Ownable_init_unchained() internal initializer { _setOwner(_msgSender()); } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _setOwner(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _setOwner(newOwner); } function _setOwner(address newOwner) private { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } uint256[49] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; interface IERC2981 { function royaltyInfo(uint256 tokenId, uint256 value) external view returns (address, uint256); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./SecurityLib.sol"; import "./HashLib.sol"; library RoyaltyLib { struct RoyaltyData { address recipient; uint256 bps; } uint256 private constant _BPS_BASE = 10000; bytes32 private constant _ROYALTY_TYPEHASH = keccak256(bytes("RoyaltyData(address recipient,uint256 bps)")); function hashStruct(RoyaltyData memory royaltyData) internal pure returns (bytes32) { return keccak256(abi.encode(_ROYALTY_TYPEHASH, royaltyData.recipient, royaltyData.bps)); } function validate(RoyaltyData memory royaltyData) internal pure returns (bool, string memory) { if (royaltyData.recipient == address(0x0)) { return (false, "RoyaltyLib: recipient verification failed"); } if (royaltyData.bps == 0 || royaltyData.bps > _BPS_BASE) { return (false, "RoyaltyLib: bps verification failed"); } return (true, ""); } function calc(uint256 salePrice, uint256 bps) internal pure returns (uint256) { return (salePrice * bps) / _BPS_BASE; } function isNotNull(RoyaltyLib.RoyaltyData memory royaltyData) internal pure returns (bool) { return (royaltyData.recipient != address(0x0) && royaltyData.bps != 0); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; library HashLib { function hashBytesArray(bytes[] memory data) internal pure returns (bytes32) { uint256 length = data.length; bytes32[] memory result = new bytes32[](length); for (uint256 i = 0; i < length; i++) { result[i] = keccak256(abi.encodePacked(data[i])); } return keccak256(abi.encodePacked(result)); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev These functions deal with verification of Merkle Trees proofs. * * The proofs can be generated using the JavaScript library * https://github.com/miguelmota/merkletreejs[merkletreejs]. * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled. * * See `test/utils/cryptography/MerkleProof.test.js` for some examples. */ library MerkleProofUpgradeable { /** * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree * defined by `root`. For this, a `proof` must be provided, containing * sibling hashes on the branch from the leaf to the root of the tree. Each * pair of leaves and each pair of pre-images are assumed to be sorted. */ function verify( bytes32[] memory proof, bytes32 root, bytes32 leaf ) internal pure returns (bool) { bytes32 computedHash = leaf; for (uint256 i = 0; i < proof.length; i++) { bytes32 proofElement = proof[i]; if (computedHash <= proofElement) { // Hash(current computed hash + current element of the proof) computedHash = keccak256(abi.encodePacked(computedHash, proofElement)); } else { // Hash(current element of the proof + current computed hash) computedHash = keccak256(abi.encodePacked(proofElement, computedHash)); } } // Check if the computed hash (root) is equal to the provided root return computedHash == root; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./ECDSAUpgradeable.sol"; import "../AddressUpgradeable.sol"; import "../../interfaces/IERC1271Upgradeable.sol"; /** * @dev Signature verification helper: Provide a single mechanism to verify both private-key (EOA) ECDSA signature and * ERC1271 contract sigantures. Using this instead of ECDSA.recover in your contract will make them compatible with * smart contract wallets such as Argent and Gnosis. * * Note: unlike ECDSA signatures, contract signature's are revocable, and the outcome of this function can thus change * through time. It could return true at block N and false at block N+1 (or the opposite). * * _Available since v4.1._ */ library SignatureCheckerUpgradeable { function isValidSignatureNow( address signer, bytes32 hash, bytes memory signature ) internal view returns (bool) { (address recovered, ECDSAUpgradeable.RecoverError error) = ECDSAUpgradeable.tryRecover(hash, signature); if (error == ECDSAUpgradeable.RecoverError.NoError && recovered == signer) { return true; } (bool success, bytes memory result) = signer.staticcall( abi.encodeWithSelector(IERC1271Upgradeable.isValidSignature.selector, hash, signature) ); return (success && result.length == 32 && abi.decode(result, (bytes4)) == IERC1271Upgradeable.isValidSignature.selector); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; abstract contract Revocable { mapping(bytes32 => bool) private _isRevoked; function _revokeHash(bytes32 hash) internal { require(!_isRevoked[hash], "Revocable: hash verification failed"); _isRevoked[hash] = true; } function _validateHash(bytes32 hash) internal view returns (bool, string memory) { if (_isRevoked[hash]) { return (false, "Revocable: hash verification failed"); } return (true, ""); } // solhint-disable-next-line ordering uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC1271 standard signature validation method for * contracts as defined in https://eips.ethereum.org/EIPS/eip-1271[ERC-1271]. * * _Available since v4.1._ */ interface IERC1271Upgradeable { /** * @dev Should return whether the signature provided is valid for the provided data * @param hash Hash of the data to be signed * @param signature Signature byte array associated with _data */ function isValidSignature(bytes32 hash, bytes memory signature) external view returns (bytes4 magicValue); }
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A token is a representation of an on-chain or off-chain asset. The token page shows information such as price, total supply, holders, transfers and social links. Learn more about this page in our Knowledge Base.