this post was submitted on 06 Aug 2023
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Facebook started as invite only. Great for an exclusive, loyal customer.
Each item is represented by an NFT on the Walmart blockchain. The innovation in the chain of custody is that everyone is verifiably using the same database. It's a permissioned database, so it's proof of authority.
https://hbr.org/2022/01/how-walmart-canada-uses-blockchain-to-solve-supply-chain-challenges
Private keys sign hashes. Hashes cannot sign hashes because there is no associated private key.