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What I'm curious about is all the so-called "blockchain" tech that banks and others are implementing.

If it's not a solution to Byzantine Generals Problem, and not de-centralized/distributed, then it can't be called a blockchain.

So I'm wondering if that's the case, or if they really are solving BGP while still being largely distributed?

Bitcoin is blockchain + POW. Git is blockchain. Chain of blocks of information where each consecutive block refers to the previous one (and one block can have multiple descendants, although this is not applicable to bitcoin) - is blockchain.

Git isn't considered to be a blockchain actually.

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