> It seems we now have hard figures to support the notion that
> proof-of-work cannot be a complete solution in itself. We will be making
> that clearer in a revision of the paper (and fixing some errors).
It seems that efforts to increase cost of e-mail by some heavy cycle burning
fail on the assumption that it will always be painless for the "individual" and
very inconvenient for "mass-mailer."
Not to mention small issue of modifying all mail transport agents and/or
end-user clients.
Let me put it simply: it will never happen.
What has far greater probability of success is taxing SMTP packets. Easy to
implement (only ISPs are involved) and governments will love it. Basic
subscription includes some quota. Each taxed packet is signed by taxing
authority (new life for ICANN) - like stamps on cigarette packs, by placing a
sealed stamping box on ISP's backbone connection. On national/state boundaries
packets not signed by recognised authorities are dropped by Customs Mail
Inspection Bridges.
=====
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