Len Sassaman – The speculation about a possible Bitcoin authorship

The identity of Satoshi Nakamoto, the creator of Bitcoin, remains one of the greatest mysteries in cryptocurrency history. In this context, the late cryptographer Len Sassaman has become the focus of speculation—especially with an upcoming HBO documentary that could raise questions about the true identity behind the most famous pseudonym in the digital world. Filmmaker Cullen Hoback announced the project “Money Electric: The Bitcoin Mystery” in October 2024, hinting that a decades-old answer to the question of Nakamoto’s identity might be revealed.

Len Sassaman in the Spotlight of Market Speculation

The announcement of the HBO documentary quickly sparked reactions on the betting platform Polymarket. Speculators began betting on various potential candidates who could be revealed as the founder of Bitcoin. In the first days after the announcement, about 44.5 percent of bettors leaned toward Len Sassaman—more than for other prominent candidates like Hal Finney, Adam Back, Nick Szabo, or Paul Le Roux. This percentage suggests that a large portion of the crypto community believes there is a historical link between the late expert and Bitcoin technology.

Who Was Len Sassaman Really?

To assess these speculations, it’s worth looking at Sassaman’s biography. The American cypherpunk was already an exceptional talent in cryptography during his youth. After his schooling in Pennsylvania, he moved to San Francisco, where he quickly became an active member of the cypherpunk community—a movement for computer security that emerged in the late 1980s, nearly two decades before Bitcoin.

Under the guidance of David Chaum, the internationally renowned “godfather of cryptography,” Sassaman further developed his expertise. He worked on pioneering projects like Pretty Good Privacy (PGP) and the open-source development of GNU Privacy Guard. Together with his partner Meredith Patterson, herself a renowned computer scientist, he later founded the SaaS startup Osogato. Despite these professional successes, Sassaman struggled with depression, which had been diagnosed in his teenage years. On July 3, 2011, the 31-year-old cryptographer took his own life. The Bitcoin community honored his memory by encoding an inscription in block 138725 of the blockchain—a digital monument describing him as “a friend, a kind soul, and a sharp tactician.”

The Chain of Evidence: Why Sassaman Is a Candidate

Several factors have led cryptography experts and speculators to consider a possible link between Len Sassaman and Satoshi Nakamoto. The timing is particularly significant: On April 23, 2011, just under two months before Sassaman’s death, Nakamoto sent his last message to the Bitcoin community. In this message, the pseudonym indicated that other projects required his attention, and then he disappeared from the public eye. The close timing of Sassaman’s suicide and Nakamoto’s sudden disappearance is interpreted by some as a meaningful coincidence.

Furthermore, there were professional connections between Sassaman and Hal Finney, another top candidate for Nakamoto’s identity. Both worked at Network Associates on PGP encryption—a project that developed fundamental concepts for secure digital communication. Interestingly, Finney was the first person besides Nakamoto to contribute code to the Bitcoin protocol and operated a node. He was also the first recipient of Bitcoin and maintained active exchanges with Nakamoto.

Another technical link: Sassaman and Finney were both experts in remailer technology—a system for anonymous data transmission, considered a direct precursor to blockchain technology. Blockstream CEO Adam Back has speculated that Nakamoto’s development team might have included remailer veterans. Sassaman’s main project, Pynchon Gate, was an evolution of this remailer technology, enabling pseudonymous information gathering over distributed nodes. Later in his research, Sassaman focused on solving the Byzantine Fault problem—a critical issue in decentralized peer-to-peer networks. This mathematical challenge was fundamental to creating secure, trustless cryptocurrencies without double-spending. Nakamoto’s revolutionary triple-entry bookkeeping system with blockchain solved exactly this problem.

Additionally, Sassaman’s geographic location during Bitcoin’s development is considered an indicator. The cryptographer lived in Belgium and had access to European perspectives. Notably, Nakamoto’s published texts consistently use British English—phrases like “bloody difficult,” “flat” instead of “apartment,” “maths” instead of “mathematics,” and the British spelling “grey.” The Genesis Block of Bitcoin also contains a headline from “The Times,” a London newspaper primarily circulated in the UK and Europe. These linguistic features and the choice of publication could point to a European-based or European-oriented founder.

What Does Sassaman’s Family Say?

Despite all the speculation and the odds on Polymarket, there is a significant contradiction: Meredith Patterson, Sassaman’s wife, publicly denied the theory. In February 2021, Patterson stated on X (formerly Twitter) that her late husband, to the best of her knowledge, was not the person behind Satoshi Nakamoto. Such a statement from someone close to the cryptographer carries considerable weight.

The final answer will likely come only with the HBO documentary—or perhaps never. The Bitcoin community will continue to speculate until the mystery of Satoshi Nakamoto is unveiled or remains forever archived on the internet.