Harold Thomas Finney was a developer and first employee of PGP Corporation, a cypherpunk and early contributor to Bitcoin development. He developed Reusable Proof of Work System (RPoW) modelled on Adam Back’s Hashcash protocol.

He is credited with operating first Bitcoin software after its release and is also the beneficiary of the first Bitcoin transaction wherein he received 10 BTC from bitcoin’s creator Satoshi Nakamoto, registered in Block 170. He continued to code even after being paralyzed by Amyotrophic Lateral Sclerosis in 2009 and wrote software for Bitcoin with a computer that tracked his eye movement.