Bitcoin Quantum Risk: 30,000 Qubits Could Crack Keys in an Hour
Alice & Bob estimates that a fault-tolerant quantum computer with about 29,588 physical qubits could derive a Bitcoin private key from an exposed public key in roughly 61.8 minutes. The theoretical model uses superconducting cat qubits, error correction and an improved Shor’s algorithm to target Bitcoin’s secp256k1 cryptography. The estimate is about 17 times lower than Google Quantum AI’s March 2026 upper bound of fewer than 500,000 qubits, though the approaches and assumptions may differ. No existing quantum computer can do this, and the projected cracking time exceeds Bitcoin’s average 10-minute block interval. Around 6–7.1 million BTC, including an estimated 6.9 million in the latest study, may be more exposed because their public keys have been revealed. Researchers warn that quantum hardware could become a concern in the early 2030s, while moving Bitcoin to quantum-resistant signatures could take years. For traders, this highlights a long-term Bitcoin security and upgrade risk, not an immediate threat to funds or near-term market stability.
Neutral
The findings point to a long-term Bitcoin security challenge, but do not establish a present ability to break keys or threaten the network. In the short term, the theoretical nature of the estimate and the lack of capable quantum hardware make a significant price effect unlikely. Traders may respond to headlines with brief concern or volatility, particularly around exposed-key holdings, but the study does not change Bitcoin’s immediate ability to process transactions. Over the longer term, the estimate may increase attention on quantum-resistant signatures, migration plans and the risks to coins with exposed public keys. Delayed or difficult upgrades could weigh on confidence, while credible progress on post-quantum protections could reduce that concern. With no immediate technical breakthrough reported, the likely direct price impact on BTC is neutral.