{"sources":{"@openzeppelin/contracts/access/Ownable.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)\n\npragma solidity ^0.8.20;\n\nimport {Context} from \"../utils/Context.sol\";\n\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * The initial owner is set to the address provided by the deployer. This can\n * later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\nabstract contract Ownable is Context {\n address private _owner;\n\n /**\n * @dev The caller account is not authorized to perform an operation.\n */\n error OwnableUnauthorizedAccount(address account);\n\n /**\n * @dev The owner is not a valid owner account. (eg. `address(0)`)\n */\n error OwnableInvalidOwner(address owner);\n\n event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n /**\n * @dev Initializes the contract setting the address provided by the deployer as the initial owner.\n */\n constructor(address initialOwner) {\n if (initialOwner == address(0)) {\n revert OwnableInvalidOwner(address(0));\n }\n _transferOwnership(initialOwner);\n }\n\n /**\n * @dev Throws if called by any account other than the owner.\n */\n modifier onlyOwner() {\n _checkOwner();\n _;\n }\n\n /**\n * @dev Returns the address of the current owner.\n */\n function owner() public view virtual returns (address) {\n return _owner;\n }\n\n /**\n * @dev Throws if the sender is not the owner.\n */\n function _checkOwner() internal view virtual {\n if (owner() != _msgSender()) {\n revert OwnableUnauthorizedAccount(_msgSender());\n }\n }\n\n /**\n * @dev Leaves the contract without owner. It will not be possible to call\n * `onlyOwner` functions. Can only be called by the current owner.\n *\n * NOTE: Renouncing ownership will leave the contract without an owner,\n * thereby disabling any functionality that is only available to the owner.\n */\n function renounceOwnership() public virtual onlyOwner {\n _transferOwnership(address(0));\n }\n\n /**\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\n * Can only be called by the current owner.\n */\n function transferOwnership(address newOwner) public virtual onlyOwner {\n if (newOwner == address(0)) {\n revert OwnableInvalidOwner(address(0));\n }\n _transferOwnership(newOwner);\n }\n\n /**\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\n * Internal function without access restriction.\n */\n function _transferOwnership(address newOwner) internal virtual {\n address oldOwner = _owner;\n _owner = newOwner;\n emit OwnershipTransferred(oldOwner, newOwner);\n }\n}\n"},"@openzeppelin/contracts/access/Ownable2Step.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable2Step.sol)\n\npragma solidity ^0.8.20;\n\nimport {Ownable} from \"./Ownable.sol\";\n\n/**\n * @dev Contract module which provides access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * The initial owner is specified at deployment time in the constructor for `Ownable`. This\n * can later be changed with {transferOwnership} and {acceptOwnership}.\n *\n * This module is used through inheritance. It will make available all functions\n * from parent (Ownable).\n */\nabstract contract Ownable2Step is Ownable {\n address private _pendingOwner;\n\n event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner);\n\n /**\n * @dev Returns the address of the pending owner.\n */\n function pendingOwner() public view virtual returns (address) {\n return _pendingOwner;\n }\n\n /**\n * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.\n * Can only be called by the current owner.\n */\n function transferOwnership(address newOwner) public virtual override onlyOwner {\n _pendingOwner = newOwner;\n emit OwnershipTransferStarted(owner(), newOwner);\n }\n\n /**\n * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.\n * Internal function without access restriction.\n */\n function _transferOwnership(address newOwner) internal virtual override {\n delete _pendingOwner;\n super._transferOwnership(newOwner);\n }\n\n /**\n * @dev The new owner accepts the ownership transfer.\n */\n function acceptOwnership() public virtual {\n address sender = _msgSender();\n if (pendingOwner() != sender) {\n revert OwnableUnauthorizedAccount(sender);\n }\n _transferOwnership(sender);\n }\n}\n"},"@openzeppelin/contracts/interfaces/IERC2981.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC2981.sol)\n\npragma solidity ^0.8.20;\n\nimport {IERC165} from \"../utils/introspection/IERC165.sol\";\n\n/**\n * @dev Interface for the NFT Royalty Standard.\n *\n * A standardized way to retrieve royalty payment information for non-fungible tokens (NFTs) to enable universal\n * support for royalty payments across all NFT marketplaces and ecosystem participants.\n */\ninterface IERC2981 is IERC165 {\n /**\n * @dev Returns how much royalty is owed and to whom, based on a sale price that may be denominated in any unit of\n * exchange. The royalty amount is denominated and should be paid in that same unit of exchange.\n */\n function royaltyInfo(\n uint256 tokenId,\n uint256 salePrice\n ) external view returns (address receiver, uint256 royaltyAmount);\n}\n"},"@openzeppelin/contracts/interfaces/draft-IERC6093.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/draft-IERC6093.sol)\npragma solidity ^0.8.20;\n\n/**\n * @dev Standard ERC20 Errors\n * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC20 tokens.\n */\ninterface IERC20Errors {\n /**\n * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.\n * @param sender Address whose tokens are being transferred.\n * @param balance Current balance for the interacting account.\n * @param needed Minimum amount required to perform a transfer.\n */\n error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);\n\n /**\n * @dev Indicates a failure with the token `sender`. Used in transfers.\n * @param sender Address whose tokens are being transferred.\n */\n error ERC20InvalidSender(address sender);\n\n /**\n * @dev Indicates a failure with the token `receiver`. Used in transfers.\n * @param receiver Address to which tokens are being transferred.\n */\n error ERC20InvalidReceiver(address receiver);\n\n /**\n * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.\n * @param spender Address that may be allowed to operate on tokens without being their owner.\n * @param allowance Amount of tokens a `spender` is allowed to operate with.\n * @param needed Minimum amount required to perform a transfer.\n */\n error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);\n\n /**\n * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.\n * @param approver Address initiating an approval operation.\n */\n error ERC20InvalidApprover(address approver);\n\n /**\n * @dev Indicates a failure with the `spender` to be approved. Used in approvals.\n * @param spender Address that may be allowed to operate on tokens without being their owner.\n */\n error ERC20InvalidSpender(address spender);\n}\n\n/**\n * @dev Standard ERC721 Errors\n * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC721 tokens.\n */\ninterface IERC721Errors {\n /**\n * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in EIP-20.\n * Used in balance queries.\n * @param owner Address of the current owner of a token.\n */\n error ERC721InvalidOwner(address owner);\n\n /**\n * @dev Indicates a `tokenId` whose `owner` is the zero address.\n * @param tokenId Identifier number of a token.\n */\n error ERC721NonexistentToken(uint256 tokenId);\n\n /**\n * @dev Indicates an error related to the ownership over a particular token. Used in transfers.\n * @param sender Address whose tokens are being transferred.\n * @param tokenId Identifier number of a token.\n * @param owner Address of the current owner of a token.\n */\n error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);\n\n /**\n * @dev Indicates a failure with the token `sender`. Used in transfers.\n * @param sender Address whose tokens are being transferred.\n */\n error ERC721InvalidSender(address sender);\n\n /**\n * @dev Indicates a failure with the token `receiver`. Used in transfers.\n * @param receiver Address to which tokens are being transferred.\n */\n error ERC721InvalidReceiver(address receiver);\n\n /**\n * @dev Indicates a failure with the `operator`’s approval. Used in transfers.\n * @param operator Address that may be allowed to operate on tokens without being their owner.\n * @param tokenId Identifier number of a token.\n */\n error ERC721InsufficientApproval(address operator, uint256 tokenId);\n\n /**\n * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.\n * @param approver Address initiating an approval operation.\n */\n error ERC721InvalidApprover(address approver);\n\n /**\n * @dev Indicates a failure with the `operator` to be approved. Used in approvals.\n * @param operator Address that may be allowed to operate on tokens without being their owner.\n */\n error ERC721InvalidOperator(address operator);\n}\n\n/**\n * @dev Standard ERC1155 Errors\n * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC1155 tokens.\n */\ninterface IERC1155Errors {\n /**\n * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.\n * @param sender Address whose tokens are being transferred.\n * @param balance Current balance for the interacting account.\n * @param needed Minimum amount required to perform a transfer.\n * @param tokenId Identifier number of a token.\n */\n error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);\n\n /**\n * @dev Indicates a failure with the token `sender`. Used in transfers.\n * @param sender Address whose tokens are being transferred.\n */\n error ERC1155InvalidSender(address sender);\n\n /**\n * @dev Indicates a failure with the token `receiver`. Used in transfers.\n * @param receiver Address to which tokens are being transferred.\n */\n error ERC1155InvalidReceiver(address receiver);\n\n /**\n * @dev Indicates a failure with the `operator`’s approval. Used in transfers.\n * @param operator Address that may be allowed to operate on tokens without being their owner.\n * @param owner Address of the current owner of a token.\n */\n error ERC1155MissingApprovalForAll(address operator, address owner);\n\n /**\n * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.\n * @param approver Address initiating an approval operation.\n */\n error ERC1155InvalidApprover(address approver);\n\n /**\n * @dev Indicates a failure with the `operator` to be approved. Used in approvals.\n * @param operator Address that may be allowed to operate on tokens without being their owner.\n */\n error ERC1155InvalidOperator(address operator);\n\n /**\n * @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.\n * Used in batch transfers.\n * @param idsLength Length of the array of token identifiers\n * @param valuesLength Length of the array of token amounts\n */\n error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);\n}\n"},"@openzeppelin/contracts/token/ERC721/ERC721.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/ERC721.sol)\n\npragma solidity ^0.8.20;\n\nimport {IERC721} from \"./IERC721.sol\";\nimport {IERC721Receiver} from \"./IERC721Receiver.sol\";\nimport {IERC721Metadata} from \"./extensions/IERC721Metadata.sol\";\nimport {Context} from \"../../utils/Context.sol\";\nimport {Strings} from \"../../utils/Strings.sol\";\nimport {IERC165, ERC165} from \"../../utils/introspection/ERC165.sol\";\nimport {IERC721Errors} from \"../../interfaces/draft-IERC6093.sol\";\n\n/**\n * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including\n * the Metadata extension, but not including the Enumerable extension, which is available separately as\n * {ERC721Enumerable}.\n */\nabstract contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Errors {\n using Strings for uint256;\n\n // Token name\n string private _name;\n\n // Token symbol\n string private _symbol;\n\n mapping(uint256 tokenId => address) private _owners;\n\n mapping(address owner => uint256) private _balances;\n\n mapping(uint256 tokenId => address) private _tokenApprovals;\n\n mapping(address owner => mapping(address operator => bool)) private _operatorApprovals;\n\n /**\n * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.\n */\n constructor(string memory name_, string memory symbol_) {\n _name = name_;\n _symbol = symbol_;\n }\n\n /**\n * @dev See {IERC165-supportsInterface}.\n */\n function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {\n return\n interfaceId == type(IERC721).interfaceId ||\n interfaceId == type(IERC721Metadata).interfaceId ||\n super.supportsInterface(interfaceId);\n }\n\n /**\n * @dev See {IERC721-balanceOf}.\n */\n function balanceOf(address owner) public view virtual returns (uint256) {\n if (owner == address(0)) {\n revert ERC721InvalidOwner(address(0));\n }\n return _balances[owner];\n }\n\n /**\n * @dev See {IERC721-ownerOf}.\n */\n function ownerOf(uint256 tokenId) public view virtual returns (address) {\n return _requireOwned(tokenId);\n }\n\n /**\n * @dev See {IERC721Metadata-name}.\n */\n function name() public view virtual returns (string memory) {\n return _name;\n }\n\n /**\n * @dev See {IERC721Metadata-symbol}.\n */\n function symbol() public view virtual returns (string memory) {\n return _symbol;\n }\n\n /**\n * @dev See {IERC721Metadata-tokenURI}.\n */\n function tokenURI(uint256 tokenId) public view virtual returns (string memory) {\n _requireOwned(tokenId);\n\n string memory baseURI = _baseURI();\n return bytes(baseURI).length > 0 ? string.concat(baseURI, tokenId.toString()) : \"\";\n }\n\n /**\n * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each\n * token will be the concatenation of the `baseURI` and the `tokenId`. Empty\n * by default, can be overridden in child contracts.\n */\n function _baseURI() internal view virtual returns (string memory) {\n return \"\";\n }\n\n /**\n * @dev See {IERC721-approve}.\n */\n function approve(address to, uint256 tokenId) public virtual {\n _approve(to, tokenId, _msgSender());\n }\n\n /**\n * @dev See {IERC721-getApproved}.\n */\n function getApproved(uint256 tokenId) public view virtual returns (address) {\n _requireOwned(tokenId);\n\n return _getApproved(tokenId);\n }\n\n /**\n * @dev See {IERC721-setApprovalForAll}.\n */\n function setApprovalForAll(address operator, bool approved) public virtual {\n _setApprovalForAll(_msgSender(), operator, approved);\n }\n\n /**\n * @dev See {IERC721-isApprovedForAll}.\n */\n function isApprovedForAll(address owner, address operator) public view virtual returns (bool) {\n return _operatorApprovals[owner][operator];\n }\n\n /**\n * @dev See {IERC721-transferFrom}.\n */\n function transferFrom(address from, address to, uint256 tokenId) public virtual {\n if (to == address(0)) {\n revert ERC721InvalidReceiver(address(0));\n }\n // Setting an \"auth\" arguments enables the `_isAuthorized` check which verifies that the token exists\n // (from != 0). Therefore, it is not needed to verify that the return value is not 0 here.\n address previousOwner = _update(to, tokenId, _msgSender());\n if (previousOwner != from) {\n revert ERC721IncorrectOwner(from, tokenId, previousOwner);\n }\n }\n\n /**\n * @dev See {IERC721-safeTransferFrom}.\n */\n function safeTransferFrom(address from, address to, uint256 tokenId) public {\n safeTransferFrom(from, to, tokenId, \"\");\n }\n\n /**\n * @dev See {IERC721-safeTransferFrom}.\n */\n function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public virtual {\n transferFrom(from, to, tokenId);\n _checkOnERC721Received(from, to, tokenId, data);\n }\n\n /**\n * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist\n *\n * IMPORTANT: Any overrides to this function that add ownership of tokens not tracked by the\n * core ERC721 logic MUST be matched with the use of {_increaseBalance} to keep balances\n * consistent with ownership. The invariant to preserve is that for any address `a` the value returned by\n * `balanceOf(a)` must be equal to the number of tokens such that `_ownerOf(tokenId)` is `a`.\n */\n function _ownerOf(uint256 tokenId) internal view virtual returns (address) {\n return _owners[tokenId];\n }\n\n /**\n * @dev Returns the approved address for `tokenId`. Returns 0 if `tokenId` is not minted.\n */\n function _getApproved(uint256 tokenId) internal view virtual returns (address) {\n return _tokenApprovals[tokenId];\n }\n\n /**\n * @dev Returns whether `spender` is allowed to manage `owner`'s tokens, or `tokenId` in\n * particular (ignoring whether it is owned by `owner`).\n *\n * WARNING: This function assumes that `owner` is the actual owner of `tokenId` and does not verify this\n * assumption.\n */\n function _isAuthorized(address owner, address spender, uint256 tokenId) internal view virtual returns (bool) {\n return\n spender != address(0) &&\n (owner == spender || isApprovedForAll(owner, spender) || _getApproved(tokenId) == spender);\n }\n\n /**\n * @dev Checks if `spender` can operate on `tokenId`, assuming the provided `owner` is the actual owner.\n * Reverts if `spender` does not have approval from the provided `owner` for the given token or for all its assets\n * the `spender` for the specific `tokenId`.\n *\n * WARNING: This function assumes that `owner` is the actual owner of `tokenId` and does not verify this\n * assumption.\n */\n function _checkAuthorized(address owner, address spender, uint256 tokenId) internal view virtual {\n if (!_isAuthorized(owner, spender, tokenId)) {\n if (owner == address(0)) {\n revert ERC721NonexistentToken(tokenId);\n } else {\n revert ERC721InsufficientApproval(spender, tokenId);\n }\n }\n }\n\n /**\n * @dev Unsafe write access to the balances, used by extensions that \"mint\" tokens using an {ownerOf} override.\n *\n * NOTE: the value is limited to type(uint128).max. This protect against _balance overflow. It is unrealistic that\n * a uint256 would ever overflow from increments when these increments are bounded to uint128 values.\n *\n * WARNING: Increasing an account's balance using this function tends to be paired with an override of the\n * {_ownerOf} function to resolve the ownership of the corresponding tokens so that balances and ownership\n * remain consistent with one another.\n */\n function _increaseBalance(address account, uint128 value) internal virtual {\n unchecked {\n _balances[account] += value;\n }\n }\n\n /**\n * @dev Transfers `tokenId` from its current owner to `to`, or alternatively mints (or burns) if the current owner\n * (or `to`) is the zero address. Returns the owner of the `tokenId` before the update.\n *\n * The `auth` argument is optional. If the value passed is non 0, then this function will check that\n * `auth` is either the owner of the token, or approved to operate on the token (by the owner).\n *\n * Emits a {Transfer} event.\n *\n * NOTE: If overriding this function in a way that tracks balances, see also {_increaseBalance}.\n */\n function _update(address to, uint256 tokenId, address auth) internal virtual returns (address) {\n address from = _ownerOf(tokenId);\n\n // Perform (optional) operator check\n if (auth != address(0)) {\n _checkAuthorized(from, auth, tokenId);\n }\n\n // Execute the update\n if (from != address(0)) {\n // Clear approval. No need to re-authorize or emit the Approval event\n _approve(address(0), tokenId, address(0), false);\n\n unchecked {\n _balances[from] -= 1;\n }\n }\n\n if (to != address(0)) {\n unchecked {\n _balances[to] += 1;\n }\n }\n\n _owners[tokenId] = to;\n\n emit Transfer(from, to, tokenId);\n\n return from;\n }\n\n /**\n * @dev Mints `tokenId` and transfers it to `to`.\n *\n * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible\n *\n * Requirements:\n *\n * - `tokenId` must not exist.\n * - `to` cannot be the zero address.\n *\n * Emits a {Transfer} event.\n */\n function _mint(address to, uint256 tokenId) internal {\n if (to == address(0)) {\n revert ERC721InvalidReceiver(address(0));\n }\n address previousOwner = _update(to, tokenId, address(0));\n if (previousOwner != address(0)) {\n revert ERC721InvalidSender(address(0));\n }\n }\n\n /**\n * @dev Mints `tokenId`, transfers it to `to` and checks for `to` acceptance.\n *\n * Requirements:\n *\n * - `tokenId` must not exist.\n * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n *\n * Emits a {Transfer} event.\n */\n function _safeMint(address to, uint256 tokenId) internal {\n _safeMint(to, tokenId, \"\");\n }\n\n /**\n * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is\n * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.\n */\n function _safeMint(address to, uint256 tokenId, bytes memory data) internal virtual {\n _mint(to, tokenId);\n _checkOnERC721Received(address(0), to, tokenId, data);\n }\n\n /**\n * @dev Destroys `tokenId`.\n * The approval is cleared when the token is burned.\n * This is an internal function that does not check if the sender is authorized to operate on the token.\n *\n * Requirements:\n *\n * - `tokenId` must exist.\n *\n * Emits a {Transfer} event.\n */\n function _burn(uint256 tokenId) internal {\n address previousOwner = _update(address(0), tokenId, address(0));\n if (previousOwner == address(0)) {\n revert ERC721NonexistentToken(tokenId);\n }\n }\n\n /**\n * @dev Transfers `tokenId` from `from` to `to`.\n * As opposed to {transferFrom}, this imposes no restrictions on msg.sender.\n *\n * Requirements:\n *\n * - `to` cannot be the zero address.\n * - `tokenId` token must be owned by `from`.\n *\n * Emits a {Transfer} event.\n */\n function _transfer(address from, address to, uint256 tokenId) internal {\n if (to == address(0)) {\n revert ERC721InvalidReceiver(address(0));\n }\n address previousOwner = _update(to, tokenId, address(0));\n if (previousOwner == address(0)) {\n revert ERC721NonexistentToken(tokenId);\n } else if (previousOwner != from) {\n revert ERC721IncorrectOwner(from, tokenId, previousOwner);\n }\n }\n\n /**\n * @dev Safely transfers `tokenId` token from `from` to `to`, checking that contract recipients\n * are aware of the ERC721 standard to prevent tokens from being forever locked.\n *\n * `data` is additional data, it has no specified format and it is sent in call to `to`.\n *\n * This internal function is like {safeTransferFrom} in the sense that it invokes\n * {IERC721Receiver-onERC721Received} on the receiver, and can be used to e.g.\n * implement alternative mechanisms to perform token transfer, such as signature-based.\n *\n * Requirements:\n *\n * - `tokenId` token must exist and be owned by `from`.\n * - `to` cannot be the zero address.\n * - `from` cannot be the zero address.\n * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n *\n * Emits a {Transfer} event.\n */\n function _safeTransfer(address from, address to, uint256 tokenId) internal {\n _safeTransfer(from, to, tokenId, \"\");\n }\n\n /**\n * @dev Same as {xref-ERC721-_safeTransfer-address-address-uint256-}[`_safeTransfer`], with an additional `data` parameter which is\n * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.\n */\n function _safeTransfer(address from, address to, uint256 tokenId, bytes memory data) internal virtual {\n _transfer(from, to, tokenId);\n _checkOnERC721Received(from, to, tokenId, data);\n }\n\n /**\n * @dev Approve `to` to operate on `tokenId`\n *\n * The `auth` argument is optional. If the value passed is non 0, then this function will check that `auth` is\n * either the owner of the token, or approved to operate on all tokens held by this owner.\n *\n * Emits an {Approval} event.\n *\n * Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.\n */\n function _approve(address to, uint256 tokenId, address auth) internal {\n _approve(to, tokenId, auth, true);\n }\n\n /**\n * @dev Variant of `_approve` with an optional flag to enable or disable the {Approval} event. The event is not\n * emitted in the context of transfers.\n */\n function _approve(address to, uint256 tokenId, address auth, bool emitEvent) internal virtual {\n // Avoid reading the owner unless necessary\n if (emitEvent || auth != address(0)) {\n address owner = _requireOwned(tokenId);\n\n // We do not use _isAuthorized because single-token approvals should not be able to call approve\n if (auth != address(0) && owner != auth && !isApprovedForAll(owner, auth)) {\n revert ERC721InvalidApprover(auth);\n }\n\n if (emitEvent) {\n emit Approval(owner, to, tokenId);\n }\n }\n\n _tokenApprovals[tokenId] = to;\n }\n\n /**\n * @dev Approve `operator` to operate on all of `owner` tokens\n *\n * Requirements:\n * - operator can't be the address zero.\n *\n * Emits an {ApprovalForAll} event.\n */\n function _setApprovalForAll(address owner, address operator, bool approved) internal virtual {\n if (operator == address(0)) {\n revert ERC721InvalidOperator(operator);\n }\n _operatorApprovals[owner][operator] = approved;\n emit ApprovalForAll(owner, operator, approved);\n }\n\n /**\n * @dev Reverts if the `tokenId` doesn't have a current owner (it hasn't been minted, or it has been burned).\n * Returns the owner.\n *\n * Overrides to ownership logic should be done to {_ownerOf}.\n */\n function _requireOwned(uint256 tokenId) internal view returns (address) {\n address owner = _ownerOf(tokenId);\n if (owner == address(0)) {\n revert ERC721NonexistentToken(tokenId);\n }\n return owner;\n }\n\n /**\n * @dev Private function to invoke {IERC721Receiver-onERC721Received} on a target address. This will revert if the\n * recipient doesn't accept the token transfer. The call is not executed if the target address is not a contract.\n *\n * @param from address representing the previous owner of the given token ID\n * @param to target address that will receive the tokens\n * @param tokenId uint256 ID of the token to be transferred\n * @param data bytes optional data to send along with the call\n */\n function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory data) private {\n if (to.code.length > 0) {\n try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {\n if (retval != IERC721Receiver.onERC721Received.selector) {\n revert ERC721InvalidReceiver(to);\n }\n } catch (bytes memory reason) {\n if (reason.length == 0) {\n revert ERC721InvalidReceiver(to);\n } else {\n /// @solidity memory-safe-assembly\n assembly {\n revert(add(32, reason), mload(reason))\n }\n }\n }\n }\n }\n}\n"},"@openzeppelin/contracts/token/ERC721/IERC721.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/IERC721.sol)\n\npragma solidity ^0.8.20;\n\nimport {IERC165} from \"../../utils/introspection/IERC165.sol\";\n\n/**\n * @dev Required interface of an ERC721 compliant contract.\n */\ninterface IERC721 is IERC165 {\n /**\n * @dev Emitted when `tokenId` token is transferred from `from` to `to`.\n */\n event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);\n\n /**\n * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.\n */\n event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);\n\n /**\n * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.\n */\n event ApprovalForAll(address indexed owner, address indexed operator, bool approved);\n\n /**\n * @dev Returns the number of tokens in ``owner``'s account.\n */\n function balanceOf(address owner) external view returns (uint256 balance);\n\n /**\n * @dev Returns the owner of the `tokenId` token.\n *\n * Requirements:\n *\n * - `tokenId` must exist.\n */\n function ownerOf(uint256 tokenId) external view returns (address owner);\n\n /**\n * @dev Safely transfers `tokenId` token from `from` to `to`.\n *\n * Requirements:\n *\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n * - `tokenId` token must exist and be owned by `from`.\n * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\n * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon\n * a safe transfer.\n *\n * Emits a {Transfer} event.\n */\n function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;\n\n /**\n * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients\n * are aware of the ERC721 protocol to prevent tokens from being forever locked.\n *\n * Requirements:\n *\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n * - `tokenId` token must exist and be owned by `from`.\n * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or\n * {setApprovalForAll}.\n * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon\n * a safe transfer.\n *\n * Emits a {Transfer} event.\n */\n function safeTransferFrom(address from, address to, uint256 tokenId) external;\n\n /**\n * @dev Transfers `tokenId` token from `from` to `to`.\n *\n * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721\n * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must\n * understand this adds an external call which potentially creates a reentrancy vulnerability.\n *\n * Requirements:\n *\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n * - `tokenId` token must be owned by `from`.\n * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\n *\n * Emits a {Transfer} event.\n */\n function transferFrom(address from, address to, uint256 tokenId) external;\n\n /**\n * @dev Gives permission to `to` to transfer `tokenId` token to another account.\n * The approval is cleared when the token is transferred.\n *\n * Only a single account can be approved at a time, so approving the zero address clears previous approvals.\n *\n * Requirements:\n *\n * - The caller must own the token or be an approved operator.\n * - `tokenId` must exist.\n *\n * Emits an {Approval} event.\n */\n function approve(address to, uint256 tokenId) external;\n\n /**\n * @dev Approve or remove `operator` as an operator for the caller.\n * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.\n *\n * Requirements:\n *\n * - The `operator` cannot be the address zero.\n *\n * Emits an {ApprovalForAll} event.\n */\n function setApprovalForAll(address operator, bool approved) external;\n\n /**\n * @dev Returns the account approved for `tokenId` token.\n *\n * Requirements:\n *\n * - `tokenId` must exist.\n */\n function getApproved(uint256 tokenId) external view returns (address operator);\n\n /**\n * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.\n *\n * See {setApprovalForAll}\n */\n function isApprovedForAll(address owner, address operator) external view returns (bool);\n}\n"},"@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/IERC721Receiver.sol)\n\npragma solidity ^0.8.20;\n\n/**\n * @title ERC721 token receiver interface\n * @dev Interface for any contract that wants to support safeTransfers\n * from ERC721 asset contracts.\n */\ninterface IERC721Receiver {\n /**\n * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}\n * by `operator` from `from`, this function is called.\n *\n * It must return its Solidity selector to confirm the token transfer.\n * If any other value is returned or the interface is not implemented by the recipient, the transfer will be\n * reverted.\n *\n * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.\n */\n function onERC721Received(\n address operator,\n address from,\n uint256 tokenId,\n bytes calldata data\n ) external returns (bytes4);\n}\n"},"@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/extensions/IERC721Metadata.sol)\n\npragma solidity ^0.8.20;\n\nimport {IERC721} from \"../IERC721.sol\";\n\n/**\n * @title ERC-721 Non-Fungible Token Standard, optional metadata extension\n * @dev See https://eips.ethereum.org/EIPS/eip-721\n */\ninterface IERC721Metadata is IERC721 {\n /**\n * @dev Returns the token collection name.\n */\n function name() external view returns (string memory);\n\n /**\n * @dev Returns the token collection symbol.\n */\n function symbol() external view returns (string memory);\n\n /**\n * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.\n */\n function tokenURI(uint256 tokenId) external view returns (string memory);\n}\n"},"@openzeppelin/contracts/token/common/ERC2981.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (token/common/ERC2981.sol)\n\npragma solidity ^0.8.20;\n\nimport {IERC2981} from \"../../interfaces/IERC2981.sol\";\nimport {IERC165, ERC165} from \"../../utils/introspection/ERC165.sol\";\n\n/**\n * @dev Implementation of the NFT Royalty Standard, a standardized way to retrieve royalty payment information.\n *\n * Royalty information can be specified globally for all token ids via {_setDefaultRoyalty}, and/or individually for\n * specific token ids via {_setTokenRoyalty}. The latter takes precedence over the first.\n *\n * Royalty is specified as a fraction of sale price. {_feeDenominator} is overridable but defaults to 10000, meaning the\n * fee is specified in basis points by default.\n *\n * IMPORTANT: ERC-2981 only specifies a way to signal royalty information and does not enforce its payment. See\n * https://eips.ethereum.org/EIPS/eip-2981#optional-royalty-payments[Rationale] in the EIP. Marketplaces are expected to\n * voluntarily pay royalties together with sales, but note that this standard is not yet widely supported.\n */\nabstract contract ERC2981 is IERC2981, ERC165 {\n struct RoyaltyInfo {\n address receiver;\n uint96 royaltyFraction;\n }\n\n RoyaltyInfo private _defaultRoyaltyInfo;\n mapping(uint256 tokenId => RoyaltyInfo) private _tokenRoyaltyInfo;\n\n /**\n * @dev The default royalty set is invalid (eg. (numerator / denominator) >= 1).\n */\n error ERC2981InvalidDefaultRoyalty(uint256 numerator, uint256 denominator);\n\n /**\n * @dev The default royalty receiver is invalid.\n */\n error ERC2981InvalidDefaultRoyaltyReceiver(address receiver);\n\n /**\n * @dev The royalty set for an specific `tokenId` is invalid (eg. (numerator / denominator) >= 1).\n */\n error ERC2981InvalidTokenRoyalty(uint256 tokenId, uint256 numerator, uint256 denominator);\n\n /**\n * @dev The royalty receiver for `tokenId` is invalid.\n */\n error ERC2981InvalidTokenRoyaltyReceiver(uint256 tokenId, address receiver);\n\n /**\n * @dev See {IERC165-supportsInterface}.\n */\n function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC165) returns (bool) {\n return interfaceId == type(IERC2981).interfaceId || super.supportsInterface(interfaceId);\n }\n\n /**\n * @inheritdoc IERC2981\n */\n function royaltyInfo(uint256 tokenId, uint256 salePrice) public view virtual returns (address, uint256) {\n RoyaltyInfo memory royalty = _tokenRoyaltyInfo[tokenId];\n\n if (royalty.receiver == address(0)) {\n royalty = _defaultRoyaltyInfo;\n }\n\n uint256 royaltyAmount = (salePrice * royalty.royaltyFraction) / _feeDenominator();\n\n return (royalty.receiver, royaltyAmount);\n }\n\n /**\n * @dev The denominator with which to interpret the fee set in {_setTokenRoyalty} and {_setDefaultRoyalty} as a\n * fraction of the sale price. Defaults to 10000 so fees are expressed in basis points, but may be customized by an\n * override.\n */\n function _feeDenominator() internal pure virtual returns (uint96) {\n return 10000;\n }\n\n /**\n * @dev Sets the royalty information that all ids in this contract will default to.\n *\n * Requirements:\n *\n * - `receiver` cannot be the zero address.\n * - `feeNumerator` cannot be greater than the fee denominator.\n */\n function _setDefaultRoyalty(address receiver, uint96 feeNumerator) internal virtual {\n uint256 denominator = _feeDenominator();\n if (feeNumerator > denominator) {\n // Royalty fee will exceed the sale price\n revert ERC2981InvalidDefaultRoyalty(feeNumerator, denominator);\n }\n if (receiver == address(0)) {\n revert ERC2981InvalidDefaultRoyaltyReceiver(address(0));\n }\n\n _defaultRoyaltyInfo = RoyaltyInfo(receiver, feeNumerator);\n }\n\n /**\n * @dev Removes default royalty information.\n */\n function _deleteDefaultRoyalty() internal virtual {\n delete _defaultRoyaltyInfo;\n }\n\n /**\n * @dev Sets the royalty information for a specific token id, overriding the global default.\n *\n * Requirements:\n *\n * - `receiver` cannot be the zero address.\n * - `feeNumerator` cannot be greater than the fee denominator.\n */\n function _setTokenRoyalty(uint256 tokenId, address receiver, uint96 feeNumerator) internal virtual {\n uint256 denominator = _feeDenominator();\n if (feeNumerator > denominator) {\n // Royalty fee will exceed the sale price\n revert ERC2981InvalidTokenRoyalty(tokenId, feeNumerator, denominator);\n }\n if (receiver == address(0)) {\n revert ERC2981InvalidTokenRoyaltyReceiver(tokenId, address(0));\n }\n\n _tokenRoyaltyInfo[tokenId] = RoyaltyInfo(receiver, feeNumerator);\n }\n\n /**\n * @dev Resets royalty information for the token id back to the global default.\n */\n function _resetTokenRoyalty(uint256 tokenId) internal virtual {\n delete _tokenRoyaltyInfo[tokenId];\n }\n}\n"},"@openzeppelin/contracts/utils/Context.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)\n\npragma solidity ^0.8.20;\n\n/**\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract Context {\n function _msgSender() internal view virtual returns (address) {\n return msg.sender;\n }\n\n function _msgData() internal view virtual returns (bytes calldata) {\n return msg.data;\n }\n\n function _contextSuffixLength() internal view virtual returns (uint256) {\n return 0;\n }\n}\n"},"@openzeppelin/contracts/utils/ReentrancyGuard.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (utils/ReentrancyGuard.sol)\n\npragma solidity ^0.8.20;\n\n/**\n * @dev Contract module that helps prevent reentrant calls to a function.\n *\n * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\n * available, which can be applied to functions to make sure there are no nested\n * (reentrant) calls to them.\n *\n * Note that because there is a single `nonReentrant` guard, functions marked as\n * `nonReentrant` may not call one another. This can be worked around by making\n * those functions `private`, and then adding `external` `nonReentrant` entry\n * points to them.\n *\n * TIP: If you would like to learn more about reentrancy and alternative ways\n * to protect against it, check out our blog post\n * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\n */\nabstract contract ReentrancyGuard {\n // Booleans are more expensive than uint256 or any type that takes up a full\n // word because each write operation emits an extra SLOAD to first read the\n // slot's contents, replace the bits taken up by the boolean, and then write\n // back. This is the compiler's defense against contract upgrades and\n // pointer aliasing, and it cannot be disabled.\n\n // The values being non-zero value makes deployment a bit more expensive,\n // but in exchange the refund on every call to nonReentrant will be lower in\n // amount. Since refunds are capped to a percentage of the total\n // transaction's gas, it is best to keep them low in cases like this one, to\n // increase the likelihood of the full refund coming into effect.\n uint256 private constant NOT_ENTERED = 1;\n uint256 private constant ENTERED = 2;\n\n uint256 private _status;\n\n /**\n * @dev Unauthorized reentrant call.\n */\n error ReentrancyGuardReentrantCall();\n\n constructor() {\n _status = NOT_ENTERED;\n }\n\n /**\n * @dev Prevents a contract from calling itself, directly or indirectly.\n * Calling a `nonReentrant` function from another `nonReentrant`\n * function is not supported. It is possible to prevent this from happening\n * by making the `nonReentrant` function external, and making it call a\n * `private` function that does the actual work.\n */\n modifier nonReentrant() {\n _nonReentrantBefore();\n _;\n _nonReentrantAfter();\n }\n\n function _nonReentrantBefore() private {\n // On the first call to nonReentrant, _status will be NOT_ENTERED\n if (_status == ENTERED) {\n revert ReentrancyGuardReentrantCall();\n }\n\n // Any calls to nonReentrant after this point will fail\n _status = ENTERED;\n }\n\n function _nonReentrantAfter() private {\n // By storing the original value once again, a refund is triggered (see\n // https://eips.ethereum.org/EIPS/eip-2200)\n _status = NOT_ENTERED;\n }\n\n /**\n * @dev Returns true if the reentrancy guard is currently set to \"entered\", which indicates there is a\n * `nonReentrant` function in the call stack.\n */\n function _reentrancyGuardEntered() internal view returns (bool) {\n return _status == ENTERED;\n }\n}\n"},"@openzeppelin/contracts/utils/Strings.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (utils/Strings.sol)\n\npragma solidity ^0.8.20;\n\nimport {Math} from \"./math/Math.sol\";\nimport {SignedMath} from \"./math/SignedMath.sol\";\n\n/**\n * @dev String operations.\n */\nlibrary Strings {\n bytes16 private constant HEX_DIGITS = \"0123456789abcdef\";\n uint8 private constant ADDRESS_LENGTH = 20;\n\n /**\n * @dev The `value` string doesn't fit in the specified `length`.\n */\n error StringsInsufficientHexLength(uint256 value, uint256 length);\n\n /**\n * @dev Converts a `uint256` to its ASCII `string` decimal representation.\n */\n function toString(uint256 value) internal pure returns (string memory) {\n unchecked {\n uint256 length = Math.log10(value) + 1;\n string memory buffer = new string(length);\n uint256 ptr;\n /// @solidity memory-safe-assembly\n assembly {\n ptr := add(buffer, add(32, length))\n }\n while (true) {\n ptr--;\n /// @solidity memory-safe-assembly\n assembly {\n mstore8(ptr, byte(mod(value, 10), HEX_DIGITS))\n }\n value /= 10;\n if (value == 0) break;\n }\n return buffer;\n }\n }\n\n /**\n * @dev Converts a `int256` to its ASCII `string` decimal representation.\n */\n function toStringSigned(int256 value) internal pure returns (string memory) {\n return string.concat(value < 0 ? \"-\" : \"\", toString(SignedMath.abs(value)));\n }\n\n /**\n * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.\n */\n function toHexString(uint256 value) internal pure returns (string memory) {\n unchecked {\n return toHexString(value, Math.log256(value) + 1);\n }\n }\n\n /**\n * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.\n */\n function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {\n uint256 localValue = value;\n bytes memory buffer = new bytes(2 * length + 2);\n buffer[0] = \"0\";\n buffer[1] = \"x\";\n for (uint256 i = 2 * length + 1; i > 1; --i) {\n buffer[i] = HEX_DIGITS[localValue & 0xf];\n localValue >>= 4;\n }\n if (localValue != 0) {\n revert StringsInsufficientHexLength(value, length);\n }\n return string(buffer);\n }\n\n /**\n * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal\n * representation.\n */\n function toHexString(address addr) internal pure returns (string memory) {\n return toHexString(uint256(uint160(addr)), ADDRESS_LENGTH);\n }\n\n /**\n * @dev Returns true if the two strings are equal.\n */\n function equal(string memory a, string memory b) internal pure returns (bool) {\n return bytes(a).length == bytes(b).length && keccak256(bytes(a)) == keccak256(bytes(b));\n }\n}\n"},"@openzeppelin/contracts/utils/introspection/ERC165.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (utils/introspection/ERC165.sol)\n\npragma solidity ^0.8.20;\n\nimport {IERC165} from \"./IERC165.sol\";\n\n/**\n * @dev Implementation of the {IERC165} interface.\n *\n * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check\n * for the additional interface id that will be supported. For example:\n *\n * ```solidity\n * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\n * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);\n * }\n * ```\n */\nabstract contract ERC165 is IERC165 {\n /**\n * @dev See {IERC165-supportsInterface}.\n */\n function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {\n return interfaceId == type(IERC165).interfaceId;\n }\n}\n"},"@openzeppelin/contracts/utils/introspection/IERC165.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (utils/introspection/IERC165.sol)\n\npragma solidity ^0.8.20;\n\n/**\n * @dev Interface of the ERC165 standard, as defined in the\n * https://eips.ethereum.org/EIPS/eip-165[EIP].\n *\n * Implementers can declare support of contract interfaces, which can then be\n * queried by others ({ERC165Checker}).\n *\n * For an implementation, see {ERC165}.\n */\ninterface IERC165 {\n /**\n * @dev Returns true if this contract implements the interface defined by\n * `interfaceId`. See the corresponding\n * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]\n * to learn more about how these ids are created.\n *\n * This function call must use less than 30 000 gas.\n */\n function supportsInterface(bytes4 interfaceId) external view returns (bool);\n}\n"},"@openzeppelin/contracts/utils/math/Math.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (utils/math/Math.sol)\n\npragma solidity ^0.8.20;\n\n/**\n * @dev Standard math utilities missing in the Solidity language.\n */\nlibrary Math {\n /**\n * @dev Muldiv operation overflow.\n */\n error MathOverflowedMulDiv();\n\n enum Rounding {\n Floor, // Toward negative infinity\n Ceil, // Toward positive infinity\n Trunc, // Toward zero\n Expand // Away from zero\n }\n\n /**\n * @dev Returns the addition of two unsigned integers, with an overflow flag.\n */\n function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n unchecked {\n uint256 c = a + b;\n if (c < a) return (false, 0);\n return (true, c);\n }\n }\n\n /**\n * @dev Returns the subtraction of two unsigned integers, with an overflow flag.\n */\n function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n unchecked {\n if (b > a) return (false, 0);\n return (true, a - b);\n }\n }\n\n /**\n * @dev Returns the multiplication of two unsigned integers, with an overflow flag.\n */\n function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n unchecked {\n // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\n // benefit is lost if 'b' is also tested.\n // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\n if (a == 0) return (true, 0);\n uint256 c = a * b;\n if (c / a != b) return (false, 0);\n return (true, c);\n }\n }\n\n /**\n * @dev Returns the division of two unsigned integers, with a division by zero flag.\n */\n function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n unchecked {\n if (b == 0) return (false, 0);\n return (true, a / b);\n }\n }\n\n /**\n * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.\n */\n function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n unchecked {\n if (b == 0) return (false, 0);\n return (true, a % b);\n }\n }\n\n /**\n * @dev Returns the largest of two numbers.\n */\n function max(uint256 a, uint256 b) internal pure returns (uint256) {\n return a > b ? a : b;\n }\n\n /**\n * @dev Returns the smallest of two numbers.\n */\n function min(uint256 a, uint256 b) internal pure returns (uint256) {\n return a < b ? a : b;\n }\n\n /**\n * @dev Returns the average of two numbers. The result is rounded towards\n * zero.\n */\n function average(uint256 a, uint256 b) internal pure returns (uint256) {\n // (a + b) / 2 can overflow.\n return (a & b) + (a ^ b) / 2;\n }\n\n /**\n * @dev Returns the ceiling of the division of two numbers.\n *\n * This differs from standard division with `/` in that it rounds towards infinity instead\n * of rounding towards zero.\n */\n function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {\n if (b == 0) {\n // Guarantee the same behavior as in a regular Solidity division.\n return a / b;\n }\n\n // (a + b - 1) / b can overflow on addition, so we distribute.\n return a == 0 ? 0 : (a - 1) / b + 1;\n }\n\n /**\n * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or\n * denominator == 0.\n * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) with further edits by\n * Uniswap Labs also under MIT license.\n */\n function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {\n unchecked {\n // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use\n // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256\n // variables such that product = prod1 * 2^256 + prod0.\n uint256 prod0 = x * y; // Least significant 256 bits of the product\n uint256 prod1; // Most significant 256 bits of the product\n assembly {\n let mm := mulmod(x, y, not(0))\n prod1 := sub(sub(mm, prod0), lt(mm, prod0))\n }\n\n // Handle non-overflow cases, 256 by 256 division.\n if (prod1 == 0) {\n // Solidity will revert if denominator == 0, unlike the div opcode on its own.\n // The surrounding unchecked block does not change this fact.\n // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.\n return prod0 / denominator;\n }\n\n // Make sure the result is less than 2^256. Also prevents denominator == 0.\n if (denominator <= prod1) {\n revert MathOverflowedMulDiv();\n }\n\n ///////////////////////////////////////////////\n // 512 by 256 division.\n ///////////////////////////////////////////////\n\n // Make division exact by subtracting the remainder from [prod1 prod0].\n uint256 remainder;\n assembly {\n // Compute remainder using mulmod.\n remainder := mulmod(x, y, denominator)\n\n // Subtract 256 bit number from 512 bit number.\n prod1 := sub(prod1, gt(remainder, prod0))\n prod0 := sub(prod0, remainder)\n }\n\n // Factor powers of two out of denominator and compute largest power of two divisor of denominator.\n // Always >= 1. See https://cs.stackexchange.com/q/138556/92363.\n\n uint256 twos = denominator & (0 - denominator);\n assembly {\n // Divide denominator by twos.\n denominator := div(denominator, twos)\n\n // Divide [prod1 prod0] by twos.\n prod0 := div(prod0, twos)\n\n // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.\n twos := add(div(sub(0, twos), twos), 1)\n }\n\n // Shift in bits from prod1 into prod0.\n prod0 |= prod1 * twos;\n\n // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such\n // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for\n // four bits. That is, denominator * inv = 1 mod 2^4.\n uint256 inverse = (3 * denominator) ^ 2;\n\n // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also\n // works in modular arithmetic, doubling the correct bits in each step.\n inverse *= 2 - denominator * inverse; // inverse mod 2^8\n inverse *= 2 - denominator * inverse; // inverse mod 2^16\n inverse *= 2 - denominator * inverse; // inverse mod 2^32\n inverse *= 2 - denominator * inverse; // inverse mod 2^64\n inverse *= 2 - denominator * inverse; // inverse mod 2^128\n inverse *= 2 - denominator * inverse; // inverse mod 2^256\n\n // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.\n // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is\n // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1\n // is no longer required.\n result = prod0 * inverse;\n return result;\n }\n }\n\n /**\n * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.\n */\n function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {\n uint256 result = mulDiv(x, y, denominator);\n if (unsignedRoundsUp(rounding) && mulmod(x, y, denominator) > 0) {\n result += 1;\n }\n return result;\n }\n\n /**\n * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded\n * towards zero.\n *\n * Inspired by Henry S. Warren, Jr.'s \"Hacker's Delight\" (Chapter 11).\n */\n function sqrt(uint256 a) internal pure returns (uint256) {\n if (a == 0) {\n return 0;\n }\n\n // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.\n //\n // We know that the \"msb\" (most significant bit) of our target number `a` is a power of 2 such that we have\n // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.\n //\n // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`\n // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`\n // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`\n //\n // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.\n uint256 result = 1 << (log2(a) >> 1);\n\n // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,\n // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at\n // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision\n // into the expected uint128 result.\n unchecked {\n result = (result + a / result) >> 1;\n result = (result + a / result) >> 1;\n result = (result + a / result) >> 1;\n result = (result + a / result) >> 1;\n result = (result + a / result) >> 1;\n result = (result + a / result) >> 1;\n result = (result + a / result) >> 1;\n return min(result, a / result);\n }\n }\n\n /**\n * @notice Calculates sqrt(a), following the selected rounding direction.\n */\n function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {\n unchecked {\n uint256 result = sqrt(a);\n return result + (unsignedRoundsUp(rounding) && result * result < a ? 1 : 0);\n }\n }\n\n /**\n * @dev Return the log in base 2 of a positive value rounded towards zero.\n * Returns 0 if given 0.\n */\n function log2(uint256 value) internal pure returns (uint256) {\n uint256 result = 0;\n unchecked {\n if (value >> 128 > 0) {\n value >>= 128;\n result += 128;\n }\n if (value >> 64 > 0) {\n value >>= 64;\n result += 64;\n }\n if (value >> 32 > 0) {\n value >>= 32;\n result += 32;\n }\n if (value >> 16 > 0) {\n value >>= 16;\n result += 16;\n }\n if (value >> 8 > 0) {\n value >>= 8;\n result += 8;\n }\n if (value >> 4 > 0) {\n value >>= 4;\n result += 4;\n }\n if (value >> 2 > 0) {\n value >>= 2;\n result += 2;\n }\n if (value >> 1 > 0) {\n result += 1;\n }\n }\n return result;\n }\n\n /**\n * @dev Return the log in base 2, following the selected rounding direction, of a positive value.\n * Returns 0 if given 0.\n */\n function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {\n unchecked {\n uint256 result = log2(value);\n return result + (unsignedRoundsUp(rounding) && 1 << result < value ? 1 : 0);\n }\n }\n\n /**\n * @dev Return the log in base 10 of a positive value rounded towards zero.\n * Returns 0 if given 0.\n */\n function log10(uint256 value) internal pure returns (uint256) {\n uint256 result = 0;\n unchecked {\n if (value >= 10 ** 64) {\n value /= 10 ** 64;\n result += 64;\n }\n if (value >= 10 ** 32) {\n value /= 10 ** 32;\n result += 32;\n }\n if (value >= 10 ** 16) {\n value /= 10 ** 16;\n result += 16;\n }\n if (value >= 10 ** 8) {\n value /= 10 ** 8;\n result += 8;\n }\n if (value >= 10 ** 4) {\n value /= 10 ** 4;\n result += 4;\n }\n if (value >= 10 ** 2) {\n value /= 10 ** 2;\n result += 2;\n }\n if (value >= 10 ** 1) {\n result += 1;\n }\n }\n return result;\n }\n\n /**\n * @dev Return the log in base 10, following the selected rounding direction, of a positive value.\n * Returns 0 if given 0.\n */\n function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {\n unchecked {\n uint256 result = log10(value);\n return result + (unsignedRoundsUp(rounding) && 10 ** result < value ? 1 : 0);\n }\n }\n\n /**\n * @dev Return the log in base 256 of a positive value rounded towards zero.\n * Returns 0 if given 0.\n *\n * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.\n */\n function log256(uint256 value) internal pure returns (uint256) {\n uint256 result = 0;\n unchecked {\n if (value >> 128 > 0) {\n value >>= 128;\n result += 16;\n }\n if (value >> 64 > 0) {\n value >>= 64;\n result += 8;\n }\n if (value >> 32 > 0) {\n value >>= 32;\n result += 4;\n }\n if (value >> 16 > 0) {\n value >>= 16;\n result += 2;\n }\n if (value >> 8 > 0) {\n result += 1;\n }\n }\n return result;\n }\n\n /**\n * @dev Return the log in base 256, following the selected rounding direction, of a positive value.\n * Returns 0 if given 0.\n */\n function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {\n unchecked {\n uint256 result = log256(value);\n return result + (unsignedRoundsUp(rounding) && 1 << (result << 3) < value ? 1 : 0);\n }\n }\n\n /**\n * @dev Returns whether a provided rounding mode is considered rounding up for unsigned integers.\n */\n function unsignedRoundsUp(Rounding rounding) internal pure returns (bool) {\n return uint8(rounding) % 2 == 1;\n }\n}\n"},"@openzeppelin/contracts/utils/math/SignedMath.sol":{"content":"// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (utils/math/SignedMath.sol)\n\npragma solidity ^0.8.20;\n\n/**\n * @dev Standard signed math utilities missing in the Solidity language.\n */\nlibrary SignedMath {\n /**\n * @dev Returns the largest of two signed numbers.\n */\n function max(int256 a, int256 b) internal pure returns (int256) {\n return a > b ? a : b;\n }\n\n /**\n * @dev Returns the smallest of two signed numbers.\n */\n function min(int256 a, int256 b) internal pure returns (int256) {\n return a < b ? a : b;\n }\n\n /**\n * @dev Returns the average of two signed numbers without overflow.\n * The result is rounded towards zero.\n */\n function average(int256 a, int256 b) internal pure returns (int256) {\n // Formula from the book \"Hacker's Delight\"\n int256 x = (a & b) + ((a ^ b) >> 1);\n return x + (int256(uint256(x) >> 255) & (a ^ b));\n }\n\n /**\n * @dev Returns the absolute unsigned value of a signed value.\n */\n function abs(int256 n) internal pure returns (uint256) {\n unchecked {\n // must be unchecked in order to support `n = type(int256).min`\n return uint256(n >= 0 ? n : -n);\n }\n }\n}\n"},"Delvers.sol":{"content":"// SPDX-License-Identifier: MIT\npragma solidity ^0.8.26;\n\nimport {ERC721} from \"@openzeppelin/contracts/token/ERC721/ERC721.sol\";\nimport {ERC2981} from \"@openzeppelin/contracts/token/common/ERC2981.sol\";\nimport {Ownable} from \"@openzeppelin/contracts/access/Ownable.sol\";\nimport {Ownable2Step} from \"@openzeppelin/contracts/access/Ownable2Step.sol\";\nimport {ReentrancyGuard} from \"@openzeppelin/contracts/utils/ReentrancyGuard.sol\";\n\ninterface IAgentReg { function balanceOf(address) external view returns (uint256); }\ninterface IDelversRenderer { function tokenURI(uint256 id, uint256 seed, uint256[9] calldata v) external view returns (string memory); }\n\n/// @title Delvers ($DLVR): on-chain pixel heroes, a daily dungeon with a boss pot, and ERC-4907 hero rental. BNB Chain.\n/// @notice Project revenue (paid mint, 25% of dungeon entries, 5% of rentals) is forwarded to `payee` in the same transaction.\n/// The boss pot can only ever be paid to the player who slays the boss. The owner has no function that moves it.\ncontract Delvers is ERC721, ERC2981, Ownable2Step, ReentrancyGuard {\n // ---------------- constants ----------------\n uint256 public constant MAX_SUPPLY = 5555;\n uint256 public constant FREE_CAP = 1111;\n uint256 public constant HALVING_EVERY = 256; // PoW target halves every 256 free mints\n uint256 public constant CHECKPOINT = 5; // fail -> back to the last multiple of 5\n uint256 public constant MAX_PRICE = 0.05 ether;\n uint256 public constant MAX_WALLET_CAP = 100;\n uint256 public constant MAX_ENTRY_FEE = 0.002 ether;\n uint256 public constant PAYEE_ENTRY_BPS = 2500; // 25% of entry fee to payee, 75% to boss pot\n uint256 public constant RENT_FEE_BPS = 500; // 5% of rent to payee, 95% to hero owner\n uint256 public constant MAX_RENT_DAYS = 30;\n uint256 public constant ROYALTY_BPS = 500;\n uint256 public constant RESOLVE_WINDOW = 256; // blockhash horizon\n\n // ---------------- config ----------------\n IAgentReg public registry = IAgentReg(0x60B9262456dE011F7d15a54CdD8c48bAaa8B022F);\n address public payee;\n address public renderer;\n bool public rendererLocked;\n\n bool public freeMintOn;\n bool public paidMintOn;\n bool public dungeonOn;\n bool public rentOn;\n\n uint256 public price = 0.0005 ether;\n uint256 public maxPerWallet = 13;\n uint256 public entryFee = 0.0002 ether;\n uint256 public bossDepth = 25;\n uint256 public baseTarget = 1 << 236; // ~1M hashes expected at the start\n\n // ---------------- mint state ----------------\n uint256 public totalSupply;\n uint256 public freeMinted;\n uint256 public paidMinted;\n mapping(address => bool) public claimedFree;\n mapping(address => uint256) public paidMintedBy;\n bytes32 private _challenge;\n bytes32 private _prevChallenge;\n mapping(uint256 => uint256) public seedOf;\n\n // ---------------- dungeon state ----------------\n struct Hero { uint32 xp; uint16 level; uint16 streak; uint32 lastDay; uint64 entryBlock; uint32 entrySeason; uint32 runs; }\n mapping(uint256 => Hero) public heroes;\n uint256 public season = 1;\n uint256 public bossPot;\n mapping(uint256 => mapping(uint256 => uint256)) public depthIn; // season => tokenId => depth\n mapping(uint256 => uint256) public seasonEntries;\n mapping(uint256 => address) public seasonWinner;\n mapping(uint256 => uint256) public seasonWinnerToken;\n mapping(uint256 => uint256) public seasonPrize;\n\n // ---------------- rental state (ERC-4907) ----------------\n struct RentListing { uint128 pricePerDay; uint32 maxDays; }\n struct UserInfo { address user; uint64 expires; }\n mapping(uint256 => RentListing) public rentListings;\n mapping(uint256 => UserInfo) private _users;\n\n // ---------------- events ----------------\n event FreeMinted(address indexed to, uint256 indexed tokenId, uint256 nonce, bytes32 nextChallenge);\n event PaidMinted(address indexed to, uint256 firstId, uint256 qty, uint256 paid);\n event Entered(uint256 indexed tokenId, address indexed runner, uint256 indexed season, uint256 day, uint256 streak, uint256 toPayee, uint256 toPot);\n event Resolved(uint256 indexed tokenId, address indexed runner, uint256 indexed season, uint256 floor, bool survived, uint256 depth, uint256 level, uint256 chance, uint256 roll);\n event EntryExpired(uint256 indexed tokenId, uint256 indexed season, uint256 depth);\n event EntryVoided(uint256 indexed tokenId, uint256 indexed season);\n event BossSlain(uint256 indexed season, uint256 indexed tokenId, address indexed runner, uint256 prize);\n event SeasonStarted(uint256 indexed season, uint256 bossDepth);\n event RentListed(uint256 indexed tokenId, address indexed owner, uint256 pricePerDay, uint256 maxDays);\n event RentUnlisted(uint256 indexed tokenId);\n event Rented(uint256 indexed tokenId, address indexed renter, address indexed owner, uint256 numDays, uint64 expires, uint256 paid);\n event UpdateUser(uint256 indexed tokenId, address indexed user, uint64 expires); // ERC-4907\n event SwitchSet(string name, bool on);\n event ConfigSet(string name, uint256 value);\n event PayeeSet(address payee);\n event RegistrySet(address registry);\n event RendererSet(address renderer, bool locked);\n\n constructor(address owner_, address payee_, address renderer_) ERC721(\"Delvers\", \"DLVR\") Ownable(owner_) {\n require(payee_ != address(0) && renderer_ != address(0), \"zero\");\n payee = payee_;\n renderer = renderer_;\n _setDefaultRoyalty(payee_, uint96(ROYALTY_BPS));\n _challenge = keccak256(abi.encodePacked(\"Delvers\", block.chainid, address(this)));\n _prevChallenge = _challenge;\n emit SeasonStarted(1, 25);\n }\n\n // ---------------- internal helpers ----------------\n function _pay(address to, uint256 amt) private {\n if (amt == 0) return;\n (bool ok, ) = payable(to).call{value: amt}(\"\");\n require(ok, \"pay failed\");\n }\n function _freeCap() internal view virtual returns (uint256) { return FREE_CAP; }\n function _halvingEvery() internal view virtual returns (uint256) { return HALVING_EVERY; }\n function _today() private view returns (uint256) { return block.timestamp / 1 days; }\n\n function _mintHero(address to) private returns (uint256 id) {\n id = ++totalSupply;\n seedOf[id] = uint256(keccak256(abi.encodePacked(block.prevrandao, id, to, blockhash(block.number - 1))));\n heroes[id].level = 1;\n _mint(to, id);\n }\n\n // ---------------- views ----------------\n function isAgent(address a) public view returns (bool) {\n try registry.balanceOf(a) returns (uint256 b) { return b > 0; } catch { return false; }\n }\n function challenge() external view returns (bytes32) { return _challenge; }\n function prevChallenge() external view returns (bytes32) { return _prevChallenge; }\n function target() public view returns (uint256) {\n uint256 s = freeMinted / _halvingEvery();\n return s >= 255 ? 0 : baseTarget >> s;\n }\n function freeLeft() public view returns (uint256) {\n uint256 cap = _freeCap(); uint256 f = freeMinted >= cap ? 0 : cap - freeMinted;\n uint256 s = MAX_SUPPLY - totalSupply;\n return f < s ? f : s;\n }\n function canFreeMint(address a) public view returns (bool) {\n return freeMintOn && !claimedFree[a] && freeLeft() > 0 && isAgent(a);\n }\n /// @notice True when `nonce` currently solves the PoW for `a` (against the current or previous challenge).\n function checkNonce(address a, uint256 nonce) public view returns (bool) {\n uint256 t = target();\n return uint256(keccak256(abi.encodePacked(_challenge, a, nonce))) < t || uint256(keccak256(abi.encodePacked(_prevChallenge, a, nonce))) < t;\n }\n /// @return cost wei for `qty`, and `allowed` how many more paid mints `a` can make right now\n function quote(address a, uint256 qty) external view returns (uint256 cost, uint256 allowed) {\n cost = price * qty;\n uint256 used = paidMintedBy[a];\n allowed = used >= maxPerWallet ? 0 : maxPerWallet - used;\n uint256 s = MAX_SUPPLY - totalSupply;\n if (s < allowed) allowed = s;\n }\n\n function statsOf(uint256 id) public view returns (uint256 atk, uint256 def, uint256 lck) {\n uint256 seed = seedOf[id];\n require(seed != 0, \"no hero\");\n uint256 cls = seed % 6;\n uint256 rr = (seed >> 8) % 100;\n uint256 rb = rr < 2 ? 4 : rr < 10 ? 2 : rr < 30 ? 1 : 0;\n // class bases: Knight 7/9/3, Rogue 7/4/9, Mage 10/3/6, Ranger 8/5/7, Cleric 5/8/7, Berserker 11/5/3\n uint256 packed = 0x070903_070409_0a0306_080507_050807_0b0503;\n uint256 b = packed >> ((5 - cls) * 24);\n atk = ((b >> 16) & 0xff) + rb + (seed >> 64) % 5;\n def = ((b >> 8) & 0xff) + rb + (seed >> 72) % 5;\n lck = (b & 0xff) + rb + (seed >> 80) % 5;\n }\n function liveStreak(uint256 id) public view returns (uint256) {\n Hero memory h = heroes[id];\n return (h.lastDay + 1 >= _today()) ? h.streak : 0;\n }\n function depthOf(uint256 id) public view returns (uint256) { return depthIn[season][id]; }\n /// @notice Survival chance (percent) for the hero's next floor: 60 + ATK+DEF+LCK + 2*level + 2*min(streak,7) - 3*floor, clamped to [15, 95].\n function survivalChance(uint256 id) public view returns (uint256) {\n (uint256 a, uint256 d, uint256 l) = statsOf(id);\n Hero memory h = heroes[id];\n uint256 st = liveStreak(id); if (st > 7) st = 7;\n uint256 floor_ = depthIn[season][id] + 1;\n uint256 up = 60 + a + d + l + 2 * uint256(h.level) + 2 * st;\n uint256 down = 3 * floor_;\n uint256 c = up > down ? up - down : 0;\n return c < 15 ? 15 : c > 95 ? 95 : c;\n }\n function controllerOf(uint256 id) public view returns (address) {\n address u = userOf(id);\n return u != address(0) ? u : ownerOf(id);\n }\n function stats() external view returns (uint256[12] memory s, bytes32 ch) {\n s = [totalSupply, freeMinted, paidMinted, price, maxPerWallet, entryFee, bossPot, season, bossDepth,\n (freeMintOn ? 1 : 0) | (paidMintOn ? 2 : 0) | (dungeonOn ? 4 : 0) | (rentOn ? 8 : 0), target(), seasonEntries[season]];\n ch = _challenge;\n }\n /// @dev v = [level, xp, depth, liveStreak, lastDay, pendingEntryBlock, atk, def, lck, chance, rentPricePerDay, rentMaxDays, userExpires, runs]\n function heroInfo(uint256 id) external view returns (address owner_, address user_, uint256[14] memory v) {\n owner_ = ownerOf(id); user_ = userOf(id);\n Hero memory h = heroes[id];\n (uint256 a, uint256 d, uint256 l) = statsOf(id);\n RentListing memory r = rentListings[id];\n v = [uint256(h.level), h.xp, depthIn[season][id], liveStreak(id), h.lastDay, h.entryBlock, a, d, l, survivalChance(id), r.pricePerDay, r.maxDays, userExpires(id), h.runs];\n }\n /// @notice Current-season depth for ids [start, start+count) (for leaderboards).\n function depths(uint256 start, uint256 count) external view returns (uint256[] memory out) {\n if (start == 0) start = 1;\n uint256 end = start + count; if (end > totalSupply + 1) end = totalSupply + 1;\n out = new uint256[](end > start ? end - start : 0);\n for (uint256 i = start; i < end; i++) out[i - start] = depthIn[season][i];\n }\n /// @notice Token ids owned by `a` among [start, start+count).\n function ownedIn(address a, uint256 start, uint256 count) external view returns (uint256[] memory ids) {\n if (start == 0) start = 1;\n uint256 end = start + count; if (end > totalSupply + 1) end = totalSupply + 1;\n uint256[] memory tmp = new uint256[](end > start ? end - start : 0); uint256 n;\n for (uint256 i = start; i < end; i++) if (_ownerOf(i) == a) tmp[n++] = i;\n ids = new uint256[](n);\n for (uint256 i = 0; i < n; i++) ids[i] = tmp[i];\n }\n\n // ---------------- mint ----------------\n /// @notice Free proof-of-work mint for .ai Agent ID wallets: keccak256(abi.encodePacked(challenge, msg.sender, nonce)) < target().\n function freeMint(uint256 nonce) external nonReentrant {\n require(freeMintOn, \"free mint off\");\n require(!claimedFree[msg.sender], \"already claimed\");\n require(freeLeft() > 0, \"free cap reached\");\n require(isAgent(msg.sender), \"no .ai Agent ID\");\n require(checkNonce(msg.sender, nonce), \"bad nonce\");\n claimedFree[msg.sender] = true;\n freeMinted++;\n _prevChallenge = _challenge;\n _challenge = keccak256(abi.encodePacked(_challenge, blockhash(block.number - 1), msg.sender, freeMinted));\n uint256 id = _mintHero(msg.sender);\n emit FreeMinted(msg.sender, id, nonce, _challenge);\n }\n\n function mint(uint256 qty) external payable nonReentrant {\n require(paidMintOn, \"paid mint off\");\n require(qty > 0 && paidMintedBy[msg.sender] + qty <= maxPerWallet, \"wallet cap\");\n require(totalSupply + qty <= MAX_SUPPLY, \"sold out\");\n uint256 cost = price * qty;\n require(msg.value >= cost, \"underpaid\");\n paidMintedBy[msg.sender] += qty;\n paidMinted += qty;\n uint256 first = totalSupply + 1;\n for (uint256 i = 0; i < qty; i++) _mintHero(msg.sender);\n emit PaidMinted(msg.sender, first, qty, cost);\n _pay(payee, cost);\n _pay(msg.sender, msg.value - cost);\n }\n\n // ---------------- dungeon ----------------\n function _failDepth(uint256 d) private pure returns (uint256) { return (d / CHECKPOINT) * CHECKPOINT; }\n\n /// @notice One run per hero per UTC day. Caller must be the hero's owner, or the active renter while a rental runs.\n function enter(uint256 id) external payable nonReentrant {\n require(dungeonOn, \"dungeon closed\");\n require(controllerOf(id) == msg.sender, \"not your hero\");\n require(msg.value == entryFee, \"wrong fee\");\n Hero storage h = heroes[id];\n if (h.entryBlock != 0) {\n if (h.entrySeason != season) { emit EntryVoided(id, h.entrySeason); }\n else {\n require(block.number > uint256(h.entryBlock) + 1 + RESOLVE_WINDOW, \"resolve first\");\n _expire(id, h);\n }\n }\n uint256 day = _today();\n require(h.lastDay != day, \"already ran today\");\n h.streak = (h.lastDay + 1 == day) ? h.streak + 1 : 1;\n h.lastDay = uint32(day);\n h.entryBlock = uint64(block.number);\n h.entrySeason = uint32(season);\n seasonEntries[season]++;\n uint256 toPayee = (msg.value * PAYEE_ENTRY_BPS) / 10000;\n uint256 toPot = msg.value - toPayee;\n bossPot += toPot;\n emit Entered(id, msg.sender, season, day, h.streak, toPayee, toPot);\n _pay(payee, toPayee);\n }\n\n /// @dev An entry left unresolved past the blockhash window counts as a failed run (prevents picking only good outcomes).\n function _expire(uint256 id, Hero storage h) private {\n uint256 d = _failDepth(depthIn[season][id]);\n depthIn[season][id] = d;\n h.entryBlock = 0;\n emit EntryExpired(id, season, d);\n }\n\n /// @notice Resolve a pending run at least 2 blocks after entering (uses blockhash(entryBlock + 1)), within 256 blocks.\n function resolve(uint256 id) external nonReentrant {\n Hero storage h = heroes[id];\n uint256 eb = h.entryBlock;\n require(eb != 0, \"no run\");\n require(controllerOf(id) == msg.sender, \"not your hero\");\n require(block.number > eb + 1, \"wait a block\");\n if (h.entrySeason != season) { h.entryBlock = 0; emit EntryVoided(id, h.entrySeason); return; }\n if (block.number > eb + 1 + RESOLVE_WINDOW) { _expire(id, h); return; }\n uint256 chance = survivalChance(id);\n h.entryBlock = 0;\n h.runs += 1;\n uint256 roll = uint256(keccak256(abi.encodePacked(blockhash(eb + 1), id, seedOf[id]))) % 100;\n uint256 d = depthIn[season][id];\n uint256 floor_ = d + 1;\n bool ok = roll < chance;\n uint256 xp = uint256(h.xp) + (ok ? 10 + floor_ : 3);\n uint256 lv = h.level;\n while (lv < 99 && xp >= lv * 25) { xp -= lv * 25; lv++; }\n h.xp = uint32(xp); h.level = uint16(lv);\n d = ok ? floor_ : _failDepth(d);\n depthIn[season][id] = d;\n emit Resolved(id, msg.sender, season, floor_, ok, d, lv, chance, roll);\n if (ok && d >= bossDepth) {\n uint256 s = season;\n uint256 prize = bossPot;\n bossPot = 0;\n seasonWinner[s] = msg.sender; seasonWinnerToken[s] = id; seasonPrize[s] = prize;\n season = s + 1;\n emit BossSlain(s, id, msg.sender, prize);\n emit SeasonStarted(s + 1, bossDepth);\n _pay(msg.sender, prize);\n }\n }\n\n // ---------------- rental (ERC-4907) ----------------\n function userOf(uint256 id) public view returns (address) {\n UserInfo memory u = _users[id];\n return uint256(u.expires) >= block.timestamp ? u.user : address(0);\n }\n function userExpires(uint256 id) public view returns (uint256) {\n UserInfo memory u = _users[id];\n return uint256(u.expires) >= block.timestamp ? u.expires : 0;\n }\n /// @notice ERC-4907 setUser. Only when no rental is active, so an owner can never cut a paid rental short.\n function setUser(uint256 id, address user, uint64 expires) external {\n require(_isAuthorized(ownerOf(id), msg.sender, id), \"not owner\");\n require(userOf(id) == address(0), \"rental active\");\n _users[id] = UserInfo(user, expires);\n emit UpdateUser(id, user, expires);\n }\n function listRent(uint256 id, uint256 pricePerDay, uint256 maxDays) external {\n require(ownerOf(id) == msg.sender, \"not owner\");\n require(pricePerDay > 0 && pricePerDay <= type(uint128).max, \"price\");\n require(maxDays >= 1 && maxDays <= MAX_RENT_DAYS, \"days\");\n rentListings[id] = RentListing(uint128(pricePerDay), uint32(maxDays));\n emit RentListed(id, msg.sender, pricePerDay, maxDays);\n }\n function unlistRent(uint256 id) external {\n require(ownerOf(id) == msg.sender, \"not owner\");\n delete rentListings[id];\n emit RentUnlisted(id);\n }\n function rent(uint256 id, uint256 numDays) external payable nonReentrant {\n require(rentOn, \"rent off\");\n RentListing memory l = rentListings[id];\n require(l.pricePerDay > 0, \"not listed\");\n require(numDays >= 1 && numDays <= l.maxDays, \"days\");\n require(userOf(id) == address(0), \"already rented\");\n address o = ownerOf(id);\n require(msg.sender != o, \"own hero\");\n uint256 cost = uint256(l.pricePerDay) * numDays;\n require(msg.value >= cost, \"underpaid\");\n uint64 exp = uint64(block.timestamp + numDays * 1 days);\n _users[id] = UserInfo(msg.sender, exp);\n emit UpdateUser(id, msg.sender, exp);\n uint256 fee = (cost * RENT_FEE_BPS) / 10000;\n emit Rented(id, msg.sender, o, numDays, exp, cost);\n _pay(payee, fee);\n _pay(o, cost - fee);\n _pay(msg.sender, msg.value - cost);\n }\n\n function _update(address to, uint256 tokenId, address auth) internal override returns (address from) {\n from = super._update(to, tokenId, auth);\n if (from != address(0) && from != to) {\n if (rentListings[tokenId].pricePerDay != 0) { delete rentListings[tokenId]; emit RentUnlisted(tokenId); }\n if (_users[tokenId].user != address(0)) { delete _users[tokenId]; emit UpdateUser(tokenId, address(0), 0); }\n }\n }\n\n // ---------------- metadata ----------------\n function tokenURI(uint256 id) public view override returns (string memory) {\n _requireOwned(id);\n Hero memory h = heroes[id];\n (uint256 a, uint256 d, uint256 l) = statsOf(id);\n uint256[9] memory v = [uint256(h.level), h.xp, depthIn[season][id], liveStreak(id), season, a, d, l, bossDepth];\n return IDelversRenderer(renderer).tokenURI(id, seedOf[id], v);\n }\n\n function supportsInterface(bytes4 i) public view override(ERC721, ERC2981) returns (bool) {\n return i == 0xad092b5c || super.supportsInterface(i);\n }\n\n // ---------------- owner admin (nothing here touches player funds or the boss pot) ----------------\n function setFreeMint(bool on) external onlyOwner { freeMintOn = on; emit SwitchSet(\"freeMint\", on); }\n function setPaidMint(bool on) external onlyOwner { paidMintOn = on; emit SwitchSet(\"paidMint\", on); }\n function setDungeon(bool on) external onlyOwner { dungeonOn = on; emit SwitchSet(\"dungeon\", on); }\n function setRent(bool on) external onlyOwner { rentOn = on; emit SwitchSet(\"rent\", on); }\n function setPrice(uint256 p) external onlyOwner { require(p > 0 && p <= MAX_PRICE, \"price cap\"); price = p; emit ConfigSet(\"price\", p); }\n function setMaxPerWallet(uint256 m) external onlyOwner { require(m >= 1 && m <= MAX_WALLET_CAP, \"cap\"); maxPerWallet = m; emit ConfigSet(\"maxPerWallet\", m); }\n function setEntryFee(uint256 f) external onlyOwner { require(f > 0 && f <= MAX_ENTRY_FEE, \"fee cap\"); entryFee = f; emit ConfigSet(\"entryFee\", f); }\n function setBossDepth(uint256 d) external onlyOwner {\n require(d >= 10 && d <= 100, \"range\");\n require(seasonEntries[season] == 0, \"season under way\");\n bossDepth = d; emit ConfigSet(\"bossDepth\", d);\n }\n /// @notice PoW difficulty base (before halvings). Bounded to [2^200, 2^250].\n function setBaseTarget(uint256 t) external onlyOwner { require(t >= (1 << 200) && t <= (1 << 250), \"range\"); baseTarget = t; emit ConfigSet(\"baseTarget\", t); }\n function setPayee(address p) external onlyOwner {\n require(p != address(0), \"zero\");\n payee = p; _setDefaultRoyalty(p, uint96(ROYALTY_BPS)); emit PayeeSet(p);\n }\n function setRegistry(address r) external onlyOwner { require(r != address(0), \"zero\"); registry = IAgentReg(r); emit RegistrySet(r); }\n function setRenderer(address r) external onlyOwner { require(!rendererLocked, \"locked\"); require(r != address(0), \"zero\"); renderer = r; emit RendererSet(r, false); }\n function lockRenderer() external onlyOwner { rendererLocked = true; emit RendererSet(renderer, true); }\n function renounceOwnership() public pure override { revert(\"disabled\"); }\n}\n"}},"abi":[{"type":"constructor","inputs":[{"name":"owner_","type":"address","internalType":"address"},{"name":"payee_","type":"address","internalType":"address"},{"name":"renderer_","type":"address","internalType":"address"}],"stateMutability":"nonpayable"},{"name":"ERC2981InvalidDefaultRoyalty","type":"error","inputs":[{"name":"numerator","type":"uint256","internalType":"uint256"},{"name":"denominator","type":"uint256","internalType":"uint256"}]},{"name":"ERC2981InvalidDefaultRoyaltyReceiver","type":"error","inputs":[{"name":"receiver","type":"address","internalType":"address"}]},{"name":"ERC2981InvalidTokenRoyalty","type":"error","inputs":[{"name":"tokenId","type":"uint256","internalType":"uint256"},{"name":"numerator","type":"uint256","internalType":"uint256"},{"name":"denominator","type":"uint256","internalType":"uint256"}]},{"name":"ERC2981InvalidTokenRoyaltyReceiver","type":"error","inputs":[{"name":"tokenId","type":"uint256","internalType":"uint256"},{"name":"receiver","type":"address","internalType":"address"}]},{"name":"ERC721IncorrectOwner","type":"error","inputs":[{"name":"sender","type":"address","internalType":"address"},{"name":"tokenId","type":"uint256","internalType":"uint256"},{"name":"owner","type":"address","internalType":"address"}]},{"name":"ERC721InsufficientApproval","type":"error","inputs":[{"name":"operator","type":"address","internalType":"address"},{"name":"tokenId","type":"uint256","internalType":"uint256"}]},{"name":"ERC721InvalidApprover","type":"error","inputs":[{"name":"approver","type":"address","internalType":"address"}]},{"name":"ERC721InvalidOperator","type":"error","inputs":[{"name":"operator","type":"address","internalType":"address"}]},{"name":"ERC721InvalidOwner","type":"error","inputs":[{"name":"owner","type":"address","internalType":"address"}]},{"name":"ERC721InvalidReceiver","type":"error","inputs":[{"name":"receiver","type":"address","internalType":"address"}]},{"name":"ERC721InvalidSender","type":"error","inputs":[{"name":"sender","type":"address","internalType":"address"}]},{"name":"ERC721NonexistentToken","type":"error","inputs":[{"name":"tokenId","type":"uint256","internalType":"uint256"}]},{"name":"OwnableInvalidOwner","type":"error","inputs":[{"name":"owner","type":"address","internalType":"address"}]},{"name":"OwnableUnauthorizedAccount","type":"error","inputs":[{"name":"account","type":"address","internalType":"address"}]},{"name":"ReentrancyGuardReentrantCall","type":"error","inputs":[]},{"name":"Approval","type":"event","inputs":[{"name":"owner","type":"address","indexed":true,"internalType":"address"},{"name":"approved","type":"address","indexed":true,"internalType":"address"},{"name":"tokenId","type":"uint256","indexed":true,"internalType":"uint256"}],"anonymous":false},{"name":"ApprovalForAll","type":"event","inputs":[{"name":"owner","type":"address","indexed":true,"internalType":"address"},{"name":"operator","type":"address","indexed":true,"internalType":"address"},{"name":"approved","type":"bool","indexed":false,"internalType":"bool"}],"anonymous":false},{"name":"BossSlain","type":"event","inputs":[{"name":"season","type":"uint256","indexed":true,"internalType":"uint256"},{"name":"tokenId","type":"uint256","indexed":true,"internalType":"uint256"},{"name":"runner","type":"address","indexed":true,"internalType":"address"},{"name":"prize","type":"uint256","indexed":false,"internalType":"uint256"}],"anonymous":false},{"name":"ConfigSet","type":"event","inputs":[{"name":"name","type":"string","indexed":false,"internalType":"string"},{"name":"value","type":"uint256","indexed":false,"internalType":"uint256"}],"anonymous":false},{"name":"Entered","type":"event","inputs":[{"name":"tokenId","type":"uint256","indexed":true,"internalType":"uint256"},{"name":"runner","type":"address","indexed":true,"internalType":"address"},{"name":"season","type":"uint256","indexed":true,"internalType":"uint256"},{"name":"day","type":"uint256","indexed":false,"internalType":"uint256"},{"name":"streak","type":"uint256","indexed":false,"internalType":"uint256"},{"name":"toPayee","type":"uint256","indexed":false,"internalType":"uint256"},{"name":"toPot","type":"uint256","indexed":false,"internalType":"uint256"}],"anonymous":false},{"name":"EntryExpired","type":"event","inputs":[{"name":"tokenId","type":"uint256","indexed":true,"internalType":"uint256"},{"name":"season","type":"uint256","indexed":true,"internalType":"uint256"},{"name":"depth","type":"uint256","indexed":false,"internalType":"uint256"}],"anonymous":false},{"name":"EntryVoided","type":"event","inputs":[{"name":"tokenId","type":"uint256","indexed":true,"internalType":"uint256"},{"name":"season","type":"uint256","indexed":true,"internalType":"uint256"}],"anonymous":false},{"name":"FreeMinted","type":"event","inputs":[{"name":"to","type":"address","indexed":true,"internalType":"address"},{"name":"tokenId","type":"uint256","indexed":true,"internalType":"uint256"},{"name":"nonce","type":"uint256","indexed":false,"i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