A non-fungible token (NFT) is a non-interchangeable unit of data stored on a blockchain, a form of digital ledger.[1] NFTs can also be associated with reproducible digital files such as photos, videos, and audio. NFTs use a digital ledger to provide a public certificate of authenticity or proof of ownership, but do not restrict the sharing or copying of the underlying digital files or the re-creation of identical NFTs. The lack of interchangeability (fungibility) distinguishes NFTs from blockchain cryptocurrencies, such as Bitcoin.
NFTs have seen some use as a speculative investment, and they have drawn criticism with respect to the energy cost and carbon footprint associated with validating blockchain transactions as well as their frequent use in art scams.[2]
