Bitcoin bulls scramble for post-quantum protection as Google drops bombshell paper Google's finding that breaking bitcoin's cryptography requires 20x fewer qubits than previously estimated has triggered the strongest industry response to quantum threats since the Willow chip in 2024. Here's how builders, investors, and researchers are reacting. What to know: - New research from Google's Quantum AI team sharply lowers the estimated resources needed for a quantum computer to break bitcoin and Ethereum wallet cryptography, suggesting such machines could arrive sooner than the mid-2030s. - The paper warns that a sufficiently powerful quantum computer could crack a bitcoin private key in about nine minutes once a public key is exposed, putting roughly one-third of all bitcoin—about 6.9 million coins—at heightened risk, especially after upgrades like Taproot. - Ethereum developers have already launched an extensive post-quantum migration effort, while prominent voices are urging the Bitcoin community to accelerate work on quantum-resistant upgrades amid concerns that state-level actors could develop and deploy such capabilities in secret. Google just told the crypto industry the threat is closer than anyone priced in. The industry, for once, is listening. A whitepaper published late Monday by Google's Quantum AI team found that breaking the 256-bit elliptic curve cryptography protecting bitcoin and Ethereum wallets could require fewer than 500,000 physical qubits (a unit of computation in quantum systems), roughly a 20-fold reduction from previous estimates that placed the requirement in the millions. The paper also described how a quantum computer could crack bitcoin private keys in about nine minutes once a transaction exposes a public key, giving an attacker a 41% chance of beating bitcoin's 10-minute confirmation window. The research landed like a bomb across online crypto circles. Not because it says quantum computers can break bitcoin today — they can't — but because it dramatically compresses