Non-fungible token (NFT) has become a quite hot topic recently along with the concept of metaverse gradually becoming clearer and more mature. As part, or even the infrastructure of the metaverse ecosystem, NFT is actually shaping how metaverse would look like in the future. Current applications of NFTs are tightly associated with digital files such as photos, audio and videos and any of those minted files are assigned unique and non-interchangeable unit of data saved on blockchain, which aut...