New Evidence Suggests Cryptographer Adam Back Invented Bitcoin

The release of roughly 3.5 million pages of Jeffrey Epstein documents by the U.S. Department of Justice on January 30, 2026, reignited one of cryptography's most enduring mysteries: whether British cypherpunk Adam Back, inventor of the proof-of-work algorithm that powers Bitcoin, is also its anonymous creator, Satoshi Nakamoto.

The Epstein files revealed that Epstein had invested approximately $500,000 in Blockstream's seed round, the Bitcoin infrastructure company co-founded and led by Back. A 2015 email from MIT Media Lab director Joi Ito proposed that Epstein hold a meeting with "Jeremy Rubin, Adam Back (or other core developer of bitcoin), Seth Lloyd, Martin Nowak... about money and the future of finance." Back publicly acknowledged the early investment on social media, stating the fund later "exited due to a potential conflict of interest, and other concerns," and that "Blockstream has no direct nor indirect financial connection with Jeffrey Epstein, or his estate." The revelation nonetheless deepened questions about the overlapping networks of Bitcoin's earliest institutional figures.

The circumstantial case for Back as Satoshi predates the Epstein disclosures by years. Back invented Hashcash in 1997, a proof-of-work system originally designed to combat email spam. When Satoshi Nakamoto published the Bitcoin white paper in 2008, Hashcash was the only prior work cited by name as the direct foundation for Bitcoin's mining mechanism. Back was also one of the first two people Satoshi contacted by email before the white paper was made public.

In 2024, those five emails between Back and Satoshi were entered into the official record of a U.K. court case stemming from Craig Wright's claims to be Satoshi. The correspondence showed Satoshi approaching Back with questions about whether Bitcoin's design related to Hashcash, and Back pointing Satoshi toward Wei Dai's b-money proposal. Wright, who had also sued Back for publicly disputing his Satoshi claim, subsequently dropped that lawsuit.

Analysts and researchers have long flagged stylistic parallels between Back's known writing and Satoshi's. Both used British English spellings and employed double spaces after periods throughout their communications, a typographical habit uncommon in American technical writing. Back himself addressed the overlap in 2020: "I moved to Malta, an EU tax haven - in 2009. Pure coincidence, though ofc I did know about Bitcoin in 2008 via emails from Satoshi. I was born in London. I do use double-space and native spelling British. Can code C++."

Ethereum and Cardano co-founder Charles Hoskinson has stated publicly that he is "absolutely certain" Back is Satoshi, arguing that Back possesses every relevant characteristic, from technical depth in cryptographic proof-of-work systems to the ideological alignment with cypherpunk privacy principles that animated Bitcoin's design.

Back has consistently denied being Satoshi. Stylometric analyses have produced conflicting results, with some researchers finding no significant similarity between Back's writing and Satoshi's, while others highlight the British-English markers as meaningful. The wallet believed to belong to Satoshi, holding an estimated 1.1 million bitcoin, has remained untouched since 2010.

What the accumulating record does establish is that Back occupied an unusually central position in Bitcoin's origin story: the architect of its core technical mechanism, one of Satoshi's first contacts, and, through Blockstream, a principal force in the infrastructure surrounding the network he may or may not have built.