The ERC721 implementation

The ERC721 Solidity implementation defines the NFT contract and implements the ERC721 and ERC165 interfaces. It also defines all the relevant state variables to store and manage the NFTs, along with their ownership, interface function implementations, and additional internal and external functions such as minting, burning, and using ERC721-defined events in the function to let consumers know about a state change within a contract.

The definition of the contract is shown in the following code block. It implements both the IERC165 and IERC721 interfaces defined earlier. The contract defines a CryptoNFT NFT:

contract CryptoNFT is IERC165, IERC721 {
}

The contract declares multiple state variables to manage the state of its NFTs. It declares variables for both the name and symbol of the NFT. The value for these variables is assigned during contract deployment within the contract constructor.

The constructor code is shown next. It accepts two arguments...