This contract implements the ERC721 standard for non-fungible tokens (NFTs). It allows users to create, own, transfer, and manage unique tokens. The contract includes functions for minting tokens, transferring ownership, checking balances, and managing approvals. It also provides metadata functions for retrieving token names, symbols, and URIs.
ERC721 :
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}.
Approval(address,address,uint256) :
Emitted when `owner` enables `approved` to manage the `tokenId` token.
ApprovalForAll(address,address,bool) :
Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
Transfer(address,address,uint256) :
Emitted when `tokenId` token is transferred from `from` to `to`.
approve(address,uint256) :
See {IERC721-approve}.
balanceOf(address) :
See {IERC721-balanceOf}.
constructor :
Initializes the contract by setting a `name` and a `symbol` to the token collection.
getApproved(uint256) :
See {IERC721-getApproved}.
isApprovedForAll(address,address) :
See {IERC721-isApprovedForAll}.
name() :
See {IERC721Metadata-name}.
ownerOf(uint256) :
See {IERC721-ownerOf}.
safeTransferFrom(address,address,uint256) :
See {IERC721-safeTransferFrom}.
safeTransferFrom(address,address,uint256,bytes) :
See {IERC721-safeTransferFrom}.
setApprovalForAll(address,bool) :
See {IERC721-setApprovalForAll}.
supportsInterface(bytes4) :
See {IERC165-supportsInterface}.
symbol() :
See {IERC721Metadata-symbol}.
tokenURI(uint256) :
See {IERC721Metadata-tokenURI}.
transferFrom(address,address,uint256) :
See {IERC721-transferFrom}.
IERC721 :
Required interface of an ERC721 compliant contract.
Approval(address,address,uint256) :
Emitted when `owner` enables `approved` to manage the `tokenId` token.
ApprovalForAll(address,address,bool) :
Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
Transfer(address,address,uint256) :
Emitted when `tokenId` token is transferred from `from` to `to`.
approve(address,uint256) :
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.
balanceOf(address) :
Returns the number of tokens in ``owner``'s account.
getApproved(uint256) :
Returns the account approved for `tokenId` token. Requirements: - `tokenId` must exist.
isApprovedForAll(address,address) :
Returns if the `operator` is allowed to manage all of the assets of `owner`. See {setApprovalForAll}
ownerOf(uint256) :
Returns the owner of the `tokenId` token. Requirements: - `tokenId` must exist.
safeTransferFrom(address,address,uint256) :
Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients are aware of the ERC721 protocol to prevent tokens from being forever locked. Requirements: - `from` cannot be the zero address. - `to` cannot be the zero address. - `tokenId` token must exist and be owned by `from`. - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}. - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. Emits a {Transfer} event.
safeTransferFrom(address,address,uint256,bytes) :
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.
setApprovalForAll(address,bool) :
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 address zero. Emits an {ApprovalForAll} event.
supportsInterface(bytes4) :
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.
transferFrom(address,address,uint256) :
Transfers `tokenId` token from `from` to `to`. WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721 or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must understand this adds an external call which potentially creates a reentrancy vulnerability. Requirements: - `from` cannot be the zero address. - `to` cannot be the zero address. - `tokenId` token must be owned by `from`. - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. Emits a {Transfer} event.
IERC165 :
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}.
supportsInterface(bytes4) :
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.
IERC721Receiver :
Interface for any contract that wants to support safeTransfers from ERC721 asset contracts.
onERC721Received(address,address,uint256,bytes) :
Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom} by `operator` from `from`, this function is called. It must return its Solidity selector to confirm the token transfer. If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted. The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
IERC721Metadata :
See https://eips.ethereum.org/EIPS/eip-721
Approval(address,address,uint256) :
Emitted when `owner` enables `approved` to manage the `tokenId` token.
ApprovalForAll(address,address,bool) :
Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
Transfer(address,address,uint256) :
Emitted when `tokenId` token is transferred from `from` to `to`.
approve(address,uint256) :
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.
balanceOf(address) :
Returns the number of tokens in ``owner``'s account.
getApproved(uint256) :
Returns the account approved for `tokenId` token. Requirements: - `tokenId` must exist.
isApprovedForAll(address,address) :
Returns if the `operator` is allowed to manage all of the assets of `owner`. See {setApprovalForAll}
name() :
Returns the token collection name.
ownerOf(uint256) :
Returns the owner of the `tokenId` token. Requirements: - `tokenId` must exist.
safeTransferFrom(address,address,uint256) :
Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients are aware of the ERC721 protocol to prevent tokens from being forever locked. Requirements: - `from` cannot be the zero address. - `to` cannot be the zero address. - `tokenId` token must exist and be owned by `from`. - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}. - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. Emits a {Transfer} event.
safeTransferFrom(address,address,uint256,bytes) :
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.
setApprovalForAll(address,bool) :
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 address zero. Emits an {ApprovalForAll} event.
supportsInterface(bytes4) :
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.
symbol() :
Returns the token collection symbol.
tokenURI(uint256) :
Returns the Uniform Resource Identifier (URI) for `tokenId` token.
transferFrom(address,address,uint256) :
Transfers `tokenId` token from `from` to `to`. WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721 or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must understand this adds an external call which potentially creates a reentrancy vulnerability. Requirements: - `from` cannot be the zero address. - `to` cannot be the zero address. - `tokenId` token must be owned by `from`. - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. Emits a {Transfer} event.
Context :
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.
Strings :
String operations.
Math :
Standard math utilities missing in the Solidity language.
SignedMath :
Standard signed math utilities missing in the Solidity language.
ERC165 :
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); } ```
supportsInterface(bytes4) :
See {IERC165-supportsInterface}.
IERC1155Errors :
Standard ERC1155 Errors Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC1155 tokens.
IERC20Errors :
Standard ERC20 Errors Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC20 tokens.
IERC721Errors :
Standard ERC721 Errors Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC721 tokens.
This contract implements the ERC721 standard for non-fungible tokens (NFTs). It allows users to create, own, transfer, and manage unique tokens. The contract includes functions for minting tokens, transferring ownership, checking balances, and managing approvals. It also provides metadata functions for retrieving token names, symbols, and URIs.
ERC721 :
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}.
Approval(address,address,uint256) :
Emitted when `owner` enables `approved` to manage the `tokenId` token.
ApprovalForAll(address,address,bool) :
Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
Transfer(address,address,uint256) :
Emitted when `tokenId` token is transferred from `from` to `to`.
approve(address,uint256) :
See {IERC721-approve}.
balanceOf(address) :
See {IERC721-balanceOf}.
constructor :
Initializes the contract by setting a `name` and a `symbol` to the token collection.
getApproved(uint256) :
See {IERC721-getApproved}.
isApprovedForAll(address,address) :
See {IERC721-isApprovedForAll}.
name() :
See {IERC721Metadata-name}.
ownerOf(uint256) :
See {IERC721-ownerOf}.
safeTransferFrom(address,address,uint256) :
See {IERC721-safeTransferFrom}.
safeTransferFrom(address,address,uint256,bytes) :
See {IERC721-safeTransferFrom}.
setApprovalForAll(address,bool) :
See {IERC721-setApprovalForAll}.
supportsInterface(bytes4) :
See {IERC165-supportsInterface}.
symbol() :
See {IERC721Metadata-symbol}.
tokenURI(uint256) :
See {IERC721Metadata-tokenURI}.
transferFrom(address,address,uint256) :
See {IERC721-transferFrom}.
IERC721 :
Required interface of an ERC721 compliant contract.
Approval(address,address,uint256) :
Emitted when `owner` enables `approved` to manage the `tokenId` token.
ApprovalForAll(address,address,bool) :
Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
Transfer(address,address,uint256) :
Emitted when `tokenId` token is transferred from `from` to `to`.
approve(address,uint256) :
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.
balanceOf(address) :
Returns the number of tokens in ``owner``'s account.
getApproved(uint256) :
Returns the account approved for `tokenId` token. Requirements: - `tokenId` must exist.
isApprovedForAll(address,address) :
Returns if the `operator` is allowed to manage all of the assets of `owner`. See {setApprovalForAll}
ownerOf(uint256) :
Returns the owner of the `tokenId` token. Requirements: - `tokenId` must exist.
safeTransferFrom(address,address,uint256) :
Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients are aware of the ERC721 protocol to prevent tokens from being forever locked. Requirements: - `from` cannot be the zero address. - `to` cannot be the zero address. - `tokenId` token must exist and be owned by `from`. - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}. - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. Emits a {Transfer} event.
safeTransferFrom(address,address,uint256,bytes) :
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.
setApprovalForAll(address,bool) :
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 address zero. Emits an {ApprovalForAll} event.
supportsInterface(bytes4) :
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.
transferFrom(address,address,uint256) :
Transfers `tokenId` token from `from` to `to`. WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721 or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must understand this adds an external call which potentially creates a reentrancy vulnerability. Requirements: - `from` cannot be the zero address. - `to` cannot be the zero address. - `tokenId` token must be owned by `from`. - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. Emits a {Transfer} event.
IERC165 :
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}.
supportsInterface(bytes4) :
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.
IERC721Receiver :
Interface for any contract that wants to support safeTransfers from ERC721 asset contracts.
onERC721Received(address,address,uint256,bytes) :
Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom} by `operator` from `from`, this function is called. It must return its Solidity selector to confirm the token transfer. If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted. The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
IERC721Metadata :
See https://eips.ethereum.org/EIPS/eip-721
Approval(address,address,uint256) :
Emitted when `owner` enables `approved` to manage the `tokenId` token.
ApprovalForAll(address,address,bool) :
Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
Transfer(address,address,uint256) :
Emitted when `tokenId` token is transferred from `from` to `to`.
approve(address,uint256) :
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.
balanceOf(address) :
Returns the number of tokens in ``owner``'s account.
getApproved(uint256) :
Returns the account approved for `tokenId` token. Requirements: - `tokenId` must exist.
isApprovedForAll(address,address) :
Returns if the `operator` is allowed to manage all of the assets of `owner`. See {setApprovalForAll}
name() :
Returns the token collection name.
ownerOf(uint256) :
Returns the owner of the `tokenId` token. Requirements: - `tokenId` must exist.
safeTransferFrom(address,address,uint256) :
Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients are aware of the ERC721 protocol to prevent tokens from being forever locked. Requirements: - `from` cannot be the zero address. - `to` cannot be the zero address. - `tokenId` token must exist and be owned by `from`. - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}. - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. Emits a {Transfer} event.
safeTransferFrom(address,address,uint256,bytes) :
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.
setApprovalForAll(address,bool) :
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 address zero. Emits an {ApprovalForAll} event.
supportsInterface(bytes4) :
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.
symbol() :
Returns the token collection symbol.
tokenURI(uint256) :
Returns the Uniform Resource Identifier (URI) for `tokenId` token.
transferFrom(address,address,uint256) :
Transfers `tokenId` token from `from` to `to`. WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721 or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must understand this adds an external call which potentially creates a reentrancy vulnerability. Requirements: - `from` cannot be the zero address. - `to` cannot be the zero address. - `tokenId` token must be owned by `from`. - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. Emits a {Transfer} event.
Context :
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.
Strings :
String operations.
Math :
Standard math utilities missing in the Solidity language.
SignedMath :
Standard signed math utilities missing in the Solidity language.
ERC165 :
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); } ```
supportsInterface(bytes4) :
See {IERC165-supportsInterface}.
IERC1155Errors :
Standard ERC1155 Errors Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC1155 tokens.
IERC20Errors :
Standard ERC20 Errors Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC20 tokens.
IERC721Errors :
Standard ERC721 Errors Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC721 tokens.
ERC721
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