Overview
- Google’s Quantum AI paper this week estimated that fewer than 500,000 physical qubits could let a future gate‑model machine derive a Bitcoin private key from a public key in roughly nine minutes.
- Because Bitcoin blocks confirm in about 10 minutes, that finding creates a live “mempool” attack window in which an attacker has near even odds to redirect a transaction before it settles.
- Roughly 6.9 million bitcoin are in wallets where public keys are already visible on-chain from early address formats or reuse, which a capable quantum system could target without any time race.
- Coinbase CEO Brian Armstrong said he will work on a solution “sooner rather than later” and is organizing developers to migrate Bitcoin to post‑quantum signature schemes.
- Postquant Labs launched the Quip Network testnet to pit quantum annealers against CPUs and GPUs on blockchain tasks, though annealers cannot run Shor’s algorithm and the startup’s speed and energy claims remain unverified.