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What is an NFT?

My definition of a Non-fungible Token (NFT)

A pile of random receipts
A receipt with arrows pointing to human-readable and machine-readable sections
  • Every NFT must have a unique resource identifier (URI) that can be automatically interrogated by software so they can be verified/authenticated. Otherwise they’re useless.
  • Some people talk about buying and selling NFTs, but you can’t buy an NFT any more than you can buy a receipt.



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Paul Walsh

MetaCert CEO. Passionate about Cybersecurity, Blockchain, Crypto, Snowboarding & Red Wine. Part of the AOL team that launched AIM. Co-founded 2 W3C Standards.