NFT
A non-fungible token (NFT) is a unique digital identifier that cannot be copied, substituted, or subdivided, that is recorded in a blockchain, and that is used to certify ownership and authenticity.
Non-fungible token - Wikipedia
A 3-second introduction to NFT that any software engineer can understand - Okapies' Archive
A smart contract that holds information linking a unique token identifier recorded on the blockchain to its holder's address, as well as a state variable.
EIP-721
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