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Adam Back

Adam Back is the British cryptographer who invented Hashcash, the proof-of-work system cited in the Bitcoin whitepaper, and CEO of Blockstream. Since 2025 he has also led Bitcoin Standard Treasury Company (BSTR), a Bitcoin treasury vehicle in the process of listing on the Nasdaq.

Riccardo CuratoloBy Riccardo Curatolo 2 min read How we work
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Who he is

Adam Back is a British applied cryptographer and one of the most respected figures in the history of Bitcoin. In 1997 he invented Hashcash, the proof-of-work system that Satoshi Nakamoto cited in the Bitcoin whitepaper and adopted for decentralized mining. He has worked on electronic cash protocols since 1995: he was an architect and cryptographer at Zero-Knowledge Systems, where he contributed to the Freedom network, a precursor of Tor, and a consultant for companies such as Nokia, Credentica (later acquired by Microsoft) and VMware. He holds a PhD in distributed systems from the University of Exeter. In 2014 he co-founded Blockstream, one of the leading infrastructure companies in the Bitcoin ecosystem, which funds Bitcoin Core development and has created technologies such as the Liquid sidechains.

Current role

  • CEO and co-founder of Blockstream — he has led the company since its founding, focusing on Bitcoin infrastructure: the Liquid sidechain, mining, the Jade hardware wallet and custody services (Verified: September 2026).
  • CEO of Bitcoin Standard Treasury Company (BSTR) — a Bitcoin treasury vehicle announced in July 2025, set to debut on the Nasdaq via a SPAC merger with Cantor Equity Partners I with roughly 30,021 BTC on its balance sheet. In July 2026 the parties renegotiated the original terms of the deal, citing changed market conditions; as of September 2026 the listing does not yet appear to be completed (Verified: September 2026).

Career path

  • 1997 — Invents Hashcash, an anti-spam proof-of-work system that, more than a decade later, would become the basis of Bitcoin mining.
  • Late 1990s-2000s — Architect and cryptographer at Zero-Knowledge Systems (the Freedom network, a precursor of Tor); co-founds Picorp, acquired by EMC.
  • 2014-present — Co-founds Blockstream and becomes its CEO; since 2025 he has combined that role with the leadership of BSTR, placing him at the intersection of Bitcoin infrastructure and capital markets.

Recent developments and controversies

  • BSTR and the Cantor merger — The deal announced in July 2025 (30,021 BTC contributed, up to $1.5 billion in PIPE financing) has been scaled back: in July 2026 the original financial structure lapsed and the parties are negotiating revised terms. The outcome remains open (Verified: September 2026).
  • The Satoshi hypothesis — Back is periodically named among the historical candidates for the identity of Satoshi Nakamoto, most recently in a New York Times investigation picked up by the trade press in 2025. He has always denied being Satoshi, and no evidence has ever linked him to the pseudonym.

FAQ

Is Adam Back Satoshi Nakamoto? There is no evidence to that effect and Back has always denied it. He is, however, the only person cited in the Bitcoin whitepaper for a direct technical contribution: the Hashcash proof-of-work system, which he invented in 1997.

What is Bitcoin Standard Treasury Company (BSTR)? It is a Bitcoin treasury company led by Adam Back, designed to hold BTC as a balance-sheet asset and list on the Nasdaq via a SPAC merger with Cantor Equity Partners I. As of September 2026 the deal has been renegotiated and is not yet completed (Verified: September 2026).

See also

Verified sources

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