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This thinking is behind the introduction of Proof-of-Work, later popularized through Bitcoin.

https://en.wikipedia.org/wiki/Hashcash



Problem with this is that it absolutely melts your phone to send a picture while a spammer with a GPU farm can blast out spam in bulk.


Also melts a small operator's mailing list server while the spammer is toasting some IP cameras and insecure IoT without care.




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