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Google Warns Bitcoin Security at Risk by 2029

4/5/2026

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Story summary
  • Google Quantum AI's whitepaper projects that quantum computers could breach Bitcoin's security by 2029, using fewer than 500,000 physical qubits.
  • About 6.9 million Bitcoin, nearly one-third of the total supply, would be at risk.
  • The analysis estimates a 41% chance of intercepting funds during a transaction, which takes about 10 minutes to confirm.
  • Google urges the crypto industry to transition to post-quantum cryptography by 2029, noting the defenses' shortened timeline.