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Re:The “mail is hard” myth by esotericn on Sunday September 01, 2019 @10:47AM (#20852545)
https://en.wikipedia.org/wiki/Hashcash

> Hashcash was proposed in 1997 by Adam Back[1] and described more formally in Back's paper "Hashcash - A Denial of Service Counter-Measure".[2]

Re:The “mail is hard” myth by brianpgordon on Sunday September 01, 2019 @11:09AM (#20852677)
I guess the idea was too obvious to be original. I'm surprised that it inspired Bitcoin instead of the other way around though.