Re: anti-spam WKBIs, Worsening google service reputation and abuse

[John Levine via NANOG <nanog () lists nanog org>]

It appears that Matthew Petach via NANOG <nanog () lists nanog org> said:
> I think we should take a cue from cryptocurrencies, and have a "proof of
> stake" type of
> challenge for email messages sent out.  The recipient machine doesn't
> accept a message
> until the sender has demonstrated they have put some skin in the game as well.

Dwork and Naor invented that in 1992.  Clever idea, doesn't work in practice.

https://www.wisdom.weizmann.ac.il/~naor/PAPERS/pvp.pdf

R's,
John
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