As someone with domain expertise in both distributed systems and crypto, I'll say "not crypto"; it's relatively well-understood and most of the people who get value out of it don't need to work on it, they can just use what already exists. By comparison, one needs detailed knowledge of distributed systems to make effective use of them, so expertise has broader value. I suspect ML/AI is similar to distributed systems in impact and value, maybe with broader market applicability, but I don't know as much about it in practice.
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