Adam Back Suggests Satoshi Nakamoto May Have Lost Access to His Bitcoin Private Keys

Speaking at Blockchain Paris Week, cryptographer Adam Back raised the possibility that the lack of movement from early Bitcoin addresses might not reflect a deliberate choice by Satoshi Nakamoto. Instead, the creator of Bitcoin may have simply lost his private keys. "It could have happened. He's human after all," Back told the audience.

Why This Matters

The fate of Satoshi Nakamoto's bitcoins is one of the most consequential open questions in the crypto market. If hundreds of thousands of BTC are permanently inaccessible, the actual circulating supply of Bitcoin is significantly lower than commonly assumed. Coming from a figure as prominent as Adam Back, these remarks reignite debate over the true volume of available coins and challenge long-standing market assumptions.

Early Wallets Had Fragile Backup Systems

Back pointed out that wallet backup procedures in Bitcoin's first years were far less reliable than today's standards. Before the widespread adoption of HD wallets and mnemonic seed phrases, users had to manually back up the wallet.dat file, which contained a set of private keys.

Anyone actively making transactions needed to update that backup regularly. Not all early users were aware of this requirement, meaning some may have permanently lost access to a portion of their holdings.

Back noted that a future migration of coins to quantum-resistant address types could reveal how many early miners actually retained control over their keys.

How Many BTC Does Satoshi Really Own?

The cryptographer emphasized that the market still lacks certainty about exactly how many coins belong to Bitcoin's creator. Commonly cited estimates rely on mining pattern analysis, but such conclusions remain speculative.

During Bitcoin's first year, network participants mined approximately 2.5 million BTC. Satoshi's share is typically estimated between 500,000 and 1 million BTC. According to Arkham data, addresses associated with Nakamoto hold 1.096 million BTC worth $82.8 billion at current prices.

However, Back suggested those coins could belong to another early participant rather than Satoshi. His personal estimate puts Satoshi's holdings at around 500,000 BTC. Regarding spending activity, no more than 40% of 2009-era coins have been spent. For later periods, the uncertainty is even greater — Nakamoto may have used some later-mined coins, and such transactions would have been the most private.

Institutional Adoption: The Biggest Wave Is Still Coming

Beyond the Satoshi discussion, Back shared his outlook on institutional demand for Bitcoin. He argued that despite market expectations, a large-scale influx of institutional capital has not yet materialized.

The cryptographer explained that institutions operate systematically. Even after a major bank announces the inclusion of BTC in its model portfolios, a lengthy process of legal review, compliance approval, and custodian selection follows. Nevertheless, this process is already underway.

Citing BlackRock flow data, Back noted that institutional players currently hold approximately 30% of coins through ETFs. The remaining 70% belongs to individuals who manage their savings through brokers or advisors.

The primary wave, according to Back, will come from the vast number of people who do not make independent investment decisions. Their capital sits in pension funds and insurance policies managed by professional fund managers. These managers are only beginning to complete the necessary procedures. Once approvals are finalized, millions of people who have never used a crypto exchange will gain Bitcoin exposure. Back estimated this wave will unfold over the next several years.

Earlier in April, a NYT journalist conducted an extensive investigation and concluded that Adam Back is the creator of Bitcoin. The cryptographer denied the claim.