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Non-Fungible Tokens (NFTs), digital certificates of ownership for virtualart, have until recently been traded on a highly lucrative and speculativemarket. Yet, an emergence of misconceptions, along with a sustained marketdowntime, are calling the value of NFTs into question. This project (1)describes three properties that any valuable NFT should possess (permanence,immutability and uniqueness), (2) creates a quantitative summary of permanenceas an initial criteria, and (3) tests our measures on 6 months of NFTs on theEthereum blockchain, finding 45% of ERC721 tokens in our corpus do not satisfythis initial criteria. Our work could help buyers and marketplaces identify andwarn users against purchasing NFTs that may be overvalued.

The Fungibility of Non-Fungible Tokens: A Quantitative Analysis of ERC-721 Metadata