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opensource the database (just as dying companies should opensource repair manuals and signing keys - have fun with your blockchain-authenticated John Deere). and regularly archive the state hash in a public archive.

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I wonder why e-gold didn't just opensource their database.

Sounds like a lot of work. Not sure why you think that is superior to simply using a blockchain.

Because a blockchain is far, far, far more expensive in terms of computing resources.

Only if it’s a Proof of Work blockchain. Ethereum is what is mainly used for NFTs and it’s in the process of migrating to Proof of Stake.

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