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Can you give some examples? Do you mean it's highly trustworthy?

>communicating under their real name and job title.

I never got spammed once on my terminal.

Not once.

He's just saying the high cost acts as an inbound filter.

Spamfilter prior to HashCash based on Proof of Income

I wonder if a messageboard where you had to submit a significantly difficult hashcash proof with every message would be very interesting.