A non-fungible token (NFT) is an unique and non-interchangeable unit of data a digital ledger (blockchain). NFTs can be associated with easily-reproducible items such as pictures, videos, audio, and other types of digital files as unique items ( to a certificate of authenticity), and use blockchain technology to offer the NFT a validated and public proof of ownership. Copies of the file are not restricted to the owner of the NFT, and can be copied and shared like any file. The absence of interchangeability (fungibility) distinguishes NFTs from blockchain cryptocurrencies, such as Bitcoin.
The first NFT project was in 2015 on the Ethereum blockchain. The total financial worth of NFTs grew in 2021, with sales of NFTs going beyond $2 billion during the very first quarter of the year.
NFTs have drawn criticism with respect to the energy cost and carbon footprint connected with validating blockchain along with its frequent usage in art frauds.