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how do you expect them to identify unique humans?

Individuality verification is different from identity verification.

I think @ash is talking about who does the verification. I really don't think any system can survive on complete decentralization, so a little well-crafted centralization can help solve certain issues.

Yeah! In a way let's use the term governance. Just like this blockchain can't function well without witnesses to verify the price feed. But that governance has to reflect the public opinion in some way or it will be centralized.