The suggestion for PoW for email bonds was called Hashcash, by Adam Back, and in... | Hacker News

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sneak on Aug 24, 2023 | parent | context | favorite | on: Proof-of-Work Defense for Onion Services

The suggestion for PoW for email bonds was called Hashcash, by Adam Back, and involved partial hash collisions.

http://www.hashcash.org/

It served as the inspiration for Bitcoin's PoW mining, interestingly enough.

drfuchs on Aug 24, 2023 [–]

The original invention of PoW, as well as the idea of using it for email, was years earlier; see Naor and Dwork's "Pricing via Processing, Or, Combatting Junk Mail" in CRYPTO'92.

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