Caltech: Quantum Computers Might Break Bitcoin With Only ~10,000 Qubits
Researchers at Caltech working with Oratomic demonstrated that executing Shor’s algorithm at scale may require roughly 10,000 qubits rather than the previously assumed million-plus. Shor’s algorithm can factor the elliptic‑curve operations underlying secp256k1 and other widely used public‑key schemes, meaning a sufficiently large, fault‑tolerant quantum computer could derive private keys from public addresses and sign transactions.
The finding doesn’t mean an immediate break—practical, error‑corrected quantum hardware is still in development—but it meaningfully lowers the resource bar and narrows the window for preparedness. For Bitcoin holders and custodians, the takeaway is urgency: avoid address reuse, prioritize cold‑storage hygiene, and accelerate evaluation of post‑quantum signature schemes or coordinated protocol upgrades. Exchanges, wallet providers, and standards bodies should start contingency planning now, because the timeline for viable quantum threats just got shorter.