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Many apps these days are promising “cash back” to consumers, which can sound too good to be true. Some of them really do deliver, though, and even significant dollars if you use them frequently.
Hashcash is a proof-of-work system used to limit email spam and denial-of-service attacks. Hashcash was proposed in 1997 by Adam Back [1] and described more formally in Back's 2002 paper "Hashcash - A Denial of Service Counter-Measure". [2]