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But then not the same because one as you say is just a datastructure that has existed already and uses standard computer science constructions. But the data structure is also revolutionary? That's a contradiction. So the other blockchain is not a datastructure but a separate unrelated concept

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You misunderstood my comment. The novel part isn't the data structure, its the consensus mechanism tied to that specific datastructure. The fact that is used to implement cryptocurrencies and whatnot is irrelevant - you can implement crypto without "blockchain" (by using a typical non-distributed datastructure, called "a database"). In fact, the buzzword for that is "private blockchain".

Ok so we agree blockchain and blockchain are different. Also private blockchain would be a 3rd definition as that's another nonsense word that people use

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