Coinbase Exec Warns Quantum Computing Threatens 33% of Bitcoin Supply – Here’s Why

A warning from a senior Coinbase executive has reignited concerns about how quantum computing could one day reshape Bitcoin’s security, with new estimates suggesting that roughly a third of the network’s total supply could be exposed under certain conditions. David Duong, Global Head of Investment Research at Coinbase, said in a recent post that Bitcoin may be entering a “new regime” as quantum computing advances, even if the threat is not immediate. Duong pointed to growing institutional awareness of the issue, including BlackRock’s decision to flag quantum risks in the amended prospectus for its iShares Bitcoin Trust ETF in May 2025 and guidance from U.S. and EU authorities urging critical infrastructure to migrate to post-quantum cryptography by 2035. Why Researchers Say a Third of Bitcoin Could Face Quantum Risk At the center of the concern is what researchers often call “Q-day,” the point at which cryptographically relevant quantum computers become...

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