Technology
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She could also simply write down the name of the person who bought the painting from you. And ask them to let her know if they sell it so she could update her records.
Sure it's possible someone might not let her know they sold the painting. But it's equally possible someone sells the painting without transferring the NFT along with it.
Sure, and instead of credit cards, the store can just write down on an index card that I owe them $60. Anyway, the idea is a level of automation exceeding what they had in Sumeria 7,000 years ago.