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NFT has a uint256 variable called tokenId, and the pair of contract address and uint256 tokenId is globally unique. Further, the tokenId can be used as an input to generate special identifications such as images in the form of zombies or cartoon characters. Algorithm 1: NFT Standard Interfaces (with selected functions) interface ERC721 { function ownerOf(uint256 tokenId) external view returns (address); function transferFrom(address from, address to, uint256 tokenId) external payable; ... } interface ERC1155 { function balanceOf(address owner, uint256 id) external view returns (address); function balanceOfBatch(address calldata owners, uint256 calldata ids) external view returns (uint256 memory); function transferFrom(address from, address to, uint256 id, uint256 quantity) external payable; ... } Another standard ERC-1155 (Multi Token Standard) [114] extends the repre- sentation of both fungible and non-fungible tokens. It provides an interface that can represent any number of tokens. In previous standards, every tokenId in contact only contains a single type of tokens. For instance, ERC-20 makes each token type deployed in separate contracts. As well, ERC-721 deploys the group of non-fungible tokens in a single contract with the same configurations. In con- trast, ERC-1155 extends the functionality of tokenId, where each of them can independently represent different configurable token types. The field may con- tain its customized information such as the metadata, lock-time, date, supply, or any other attributes. Here, we provide an illustration (see Fig.2) to show their structures and aforementioned differences. 3.3 NFTs Desired Proprieties NFT schemes are essentially decentralized applications [70], and thus enjoy the benefits/properties from their underlying public ledgers. We summarise the key properties as follows. - Verifiability. The NFT with its token metadata and its ownership can be publicly verified. - Transparent Execution. The activities of NFTs include minting, selling and purchasing are publicly accessible. 7PDF Image | Non-Fungible Token (NFT): Overview, Evaluation, Opportunities
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