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NFTs, short for non-fungible tokens, are blockchain-based cryptographic tokens. The big distinction from fungible tokens like bitcoin is that each NFT has unique properties, containing different data like directions to a specific artwork.
This is in comparison to the example of bitcoin, where each token is in theory the same, mutually interchangeable, and therefore fungible. The hash function is deterministic and "one way" which means the artwork data cannot be recreated from only the hash function.