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A non-fungible token, or NFT, is a type of token on the blockchain that represents a unique digital asset: crypto-collectibles, gaming units, or even art pieces. By adding gamification to the yield-farming process, NFTs promote user engagement and foster mass adoption. The first NFT-like token was introduced by Coloured Coins, aka Bitcoin 2x, back in 2012. The most common example of an NFT is the ERC-721 token used by CryptoKitties.