Standard NFT
The ERC721 smart contract standard is the basic standard for NFTs on EVM compatible chains.
The ERC721 is a smart contract standard which is specialised in single-copy Non Fungible Tokens (NFT) and out-of-the-box compatible with Opensea. In an ERC721, every NFT is unique which means you have to reference the content for each NFT.
Variables
_name: The name of your NFT collection
_symbol: The symbol of your NFT collection
_owner: The owner of the NFT collection. Can be transferred and is initially set to the deployer wallet.
_currentTokenID: The Index of NFTs minted in this collection. Initially set to 1.
constructor
None
Initializes the contract by setting the NFT's name and symbol, and assigns the contract deployer as the initial owner.
None
name
None
Returns the name of the NFT.
string memory
symbol
None
Returns the symbol of the NFT.
string memory
balanceOf
address owner
Returns the number of NFT tokens owned by a specific address.
uint256
ownerOf
uint256 tokenId
Returns the owner address of the specified token ID.
address
tokenImage
uint256 tokenId
Retrieves the image URL linked to a specific token ID.
string memory
transferFrom
address from, address to, uint256 tokenId
Transfers a token from one address to another, if the sender is approved or the owner.
None
approve
address to, uint256 tokenId
Approves another address to transfer a specific token ID.
None
setApprovalForAll
address operator, bool approved
Sets or unsets approval for an operator to manage all of the sender's tokens.
None
isApprovedForAll
address owner, address operator
Checks if an operator is approved to manage all tokens of a given owner.
bool
getApproved
uint256 tokenId
Returns the approved address for a specific token ID.
address
mint
address to, string memory imageUrl
Mints a new token to a specified address with an associated image URL, only callable by the owner.
None
_exists
uint256 tokenId
Internal function to check if a token exists.
bool
_isApprovedOrOwner
address spender, uint256 tokenId
Internal function to check if an address is an approved spender or the owner of a specific token ID.
bool
_transfer
address from, address to, uint256 tokenId
Internal function to handle the token transfer mechanics.
None
_approve
address to, uint256 tokenId
Internal function to set the approval of a given address to manage a specific token ID.
None
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