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 Alternatively require high PoW on just kind 0 events. Really high, like it takes at least 1 minute to mine. 
 Given that there's a form of PoW when registering for normal websites, be it in the form of complex captchas, doing so would be good.

I guess for existing pubkeys, they would need to submit a kind 0 update with a high PoW? 
 Given that there's a form of PoW when registering for normal websites, be it in the form of complex captchas, doing so would be good.

I guess for existing pubkeys, they would need to submit a kind 0 update with a high PoW? nostr.fmt.wiz.biz