* Hadmut Danisch:
As far as I can see, this looks almost exactly like the e-mail stamp
proposal Bill Gates made on several conferences and several interviews
before Microsoft came up with CallerID/SenderID.
Hashcash is even earlier prior art, I think. IIRC, the main
contribution by Microsoft's researchers was a puzzle that stressed
memory bandwidth, and not CPU cycles, in the hope that this would be
fairer because memory bandwidth doesn't very as much as CPU speed.
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