Some time ago, an interesting question arose: Could a deceased cryptographer named Len Sassaman be the mysterious Satoshi Nakamoto? Filmmaker Cullen Hoback announced at the time an HBO documentary in which he promised to reveal the true identity of Bitcoin's inventor. The internet took notice, and bettors on Polymarket suddenly heavily wagered on Len Sassaman as the likely candidate.

Who was this Len Sassaman anyway? A cryptography genius who moved from Pennsylvania to San Francisco as a teenager and joined the cypherpunk movement. He studied under David Chaum, a pioneer of modern cryptography, and worked on legendary projects like PGP. Sassaman also developed Pynchon Gate, an advancement of remailer technology that enabled anonymous communication. Later, he founded the startup Osogato with his wife Meredith Patterson.

The speculation that Len Sassaman could be Satoshi was based on several suspicious parallels. Sassaman worked with Hal Finney—and Finney was the first person to contribute to Bitcoin code and communicate directly with Nakamoto. Both were deeply involved with remailer technology, a direct predecessor of Bitcoin. Sassaman had even dealt with the Byzantine fault, exactly the problem Nakamoto later solved with the blockchain. The timing also seemed suspicious: Nakamoto disappeared in April 2011, and Len Sassaman died just a few months later, in July 2011, at the age of 31.

But here’s the big catch: Meredith Patterson, Sassaman’s widow, has clearly denied this. She publicly stated that her deceased husband, to the best of his knowledge, was not Satoshi Nakamoto. And honestly, there are other strong candidates like Adam Back or Nick Szabo, who fit the technical profile just as well. The HBO documentary ultimately did not provide a definitive answer—Satoshi’s identity remains one of the biggest mysteries in crypto history. In any case, Len Sassaman will continue to be remembered as a brilliant cryptographer in blockchain history, whether or not he was Satoshi.