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Pretty sure they're blockchains. But I've had my doubts a few times.

Decentralized-- well there's a bunch of ways of defining that.

Trouble is they don't even work as described, and since they're so screwed up, when you ask if x y or z works, the orgs behind them actually think it's better to lie.

They are replicated databases among a set of trusted nodes (validators). Have nothing to do with Satoshi's invention. Could have been around since the 1970s really.

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