PoW is also not a verification system.
Spammers are more than willing to pay to spam better. They will even buy batches of email addresses, run bots etc…
Spammers pay. "Normal" users, commonly, do not.
Agreed.
PoW keys are a step in the right direction, but even better are what I call PoW endorsements.
https://pippellia.com/pippellia/Social+Graph/Navigating+the+social+graph#PoW+endorsement
PoW is also not a verification system.
Spammers are more than willing to pay to spam better. They will even buy batches of email addresses, run bots etc…
Spammers pay. "Normal" users, commonly, do not.
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