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static-informational Adam Back 90s Cypherpunk, Inventor of HashCash, CEO of Blockstream /people/adam-back
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From wikipedia:

Adam Back (born July 1970) is a British cryptographer and crypto-hacker.

He is the inventor of hashcash, the proof-of-work system used by several anti-spam systems. A similar system is used in bitcoin. Hashcash has also been used in a number of other protocols such as combating blog spam, and defending against user namespace pollution.

He is also known for pioneering the use of ultra-compact code with his 3-line RSA in Perl signature file and non-exportable T-shirts to protest the (now relaxed) United States cryptography export regulations.

Today he is CEO of Blockstream, a company that seeks to further the development of bitcoin and blockchain technology.