What if we signed a Bitcoin transaction with our Nostr public key with a significant amount of money in the address. Then it would allow us to filter address and interact with only signed address. 100 dollars every signed transaction would be too expensive to make millions of accounts. 
I've known for years that high followers count on most profiles were fake on every platform because you could easily purchase followers. It is just a matter of time when you can purchase followers on Nostr.
We need a way to verify if someone is real or not. Maybe others could sign a transaction verifying your identify.
Eventually someone will think of a system. The dead internet theory still lives on.
Most of the internet is fake with bots pretending to be human.