I think the Bitcoin blockchain itself is Satoshi. It's a self-aware AI on it's way to world domination through crypto-currency dominance!
Jokes aside, I have no idea... It could be indeed a group of people with a strong agreement (a contract, perhaps?) that prevents them from revealing their true identity, for whatever reasons. Or perhaps it's one person that decided to keep their identity a secret. A nameless hero? Or maybe he or she is just waiting for the perfect moment to come out.
Personally, I believe more in the idea of a group of people or even an organization, but it's pure conjecture.
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I tend more towards the group of people or an organization theory as well.
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