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Blockchain and especially its application in Bitcoin isn't that revolutionary to consider that it couldn't have been created by a human. It isn't that hard to understand if you understand some basic cryptography primitives. It was a great leap and Bitcoin's design shows a great visionary genius of its creators, but we can see today, that if they had more foresight, they could have done much better (comparing to some modern fintech technologies) and if it wasn't for them, in a few years someone would have come up with something similarly ingenious.