Recently, while researching the early history of Bitcoin, I thought of Hal Finney. Honestly, his story truly deserves to be known by more people.

Many people only know that Satoshi Nakamoto created Bitcoin, but few understand how significant Hal Finney’s contributions were in the early stages of the project. This guy was born in 1956 in California and has been fascinated by technology and cryptography since he was young. After graduating from Caltech in 1979, he worked in the gaming industry for a while, but ultimately he pursued a career in cryptography.

His true value lies in the fact that—before Bitcoin appeared—Hal Finney was already a participant in the cypherpunk movement. He helped develop PGP (Pretty Good Privacy), one of the earliest widely available email encryption programs. By 2004, he even created a reusable proof-of-work algorithm (RPOW), which was later extensively used in Bitcoin.

On October 31, 2008, when Satoshi released the Bitcoin white paper, Hal Finney responded immediately. This guy didn’t just look at it and think, “That’s interesting,” but actually got involved. He engaged in in-depth technical discussions with Satoshi and offered many suggestions for improvements. More importantly, after Bitcoin went live, Hal Finney was the first to download the client and run a node. On January 11, 2009, he tweeted a legendary message: “Running Bitcoin.” Soon after, they conducted the first Bitcoin transaction in history, which proved the system’s feasibility.

Thanks to the close collaboration between Hal Finney and Satoshi, along with his work on RPOW, some began to speculate that Hal Finney might be Satoshi. However, Hal always denied this. The current consensus in the cryptography community is that they are two different people, but Hal was indeed one of the most critical contributors to Bitcoin’s early development.

Interestingly, this tech genius was also a good husband and father. But in 2009, doctors diagnosed him with ALS (amyotrophic lateral sclerosis), a progressive neurodegenerative disease. The illness gradually took away his mobility, but Hal didn’t give up. He continued programming using eye-tracking devices and kept communicating with the world. His perseverance and optimism are truly inspiring.

On August 28, 2014, Hal Finney passed away at the age of 58. In accordance with his wishes, his body was cryogenically preserved by the Alcor Life Extension Foundation. This decision itself reflected his belief in the future and the potential of technology.

Looking back now, Hal Finney’s legacy is far more than his connection to Bitcoin. He was a pioneer in cryptography and digital privacy; his work on PGP and RPOW laid the foundation for modern cryptosystems. But what truly makes him immortal is his understanding of Bitcoin’s philosophy—he saw it not just as a technological innovation, but as a tool to empower individuals and protect financial freedom. His vision and persistence have changed the way we perceive money, technology, and privacy.