NFTs

A non-fungible token (NFT) is a unique and non-interchangeable unit of data stored on a blockchain, a form of digital ledger. NFTs can 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. The lack of interchangeability (fungibility) distinguishes NFTs from blockchain cryptocurrencies, such as Bitcoin.

NFTs 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. Further criticisms challenge the usefulness of establishing proof of ownership in an often extralegal unregulated market.    (Wikipedia)