Google Quantum AI has issued a stark warning: quantum computers could potentially crack Bitcoin’s private keys in as little as 9 minutes, posing a direct threat to the cryptocurrency’s security. This alarming estimate, detailed in a recent whitepaper, marks a shift from theoretical risk to a more immediate concern as quantum technology advances.
The paper outlines that breaking Bitcoin’s elliptic-curve cryptography may require only 1,200 to 1,450 logical qubits, translating to fewer than half a million physical qubits on a standard superconducting architecture. This is a sharp reduction from earlier, more speculative estimates, bringing the timeline for a viable threat closer than previously thought. For an “on-spend” attack—where part of the quantum algorithm is precomputed before a public key is exposed—the live attack window could shrink to 9 to 12 minutes, with a 41% chance of success within Bitcoin’s typical 10-minute block interval.
This vulnerability isn’t abstract. The research highlights that roughly 1.7 million bitcoin—nearly 9% of the total supply—resides in old P2PK outputs with exposed public keys, making them prime targets for both at-rest and on-spend attacks. Even coins protected by hashed addresses remain at risk during transaction settlement when public mempool exposure occurs.
Beyond Bitcoin, the implications ripple across the digital asset ecosystem. Ethereum, smart contracts, stablecoins, and tokenized real-world assets all face similar quantum threats through exposed keys, administrative multisig setups, and contract control paths. As digital systems increasingly intersect with traditional finance and payments, a single breached key at a critical moment could unleash significant damage.
The cloud computing angle amplifies this danger. With platforms like Amazon Braket, IBM’s Quantum Platform, and Google’s own Quantum Computing Service already offering remote access to quantum hardware, the future delivery model for such technology could mirror today’s on-demand services. A cryptographically relevant quantum computer might not be a locked-away supercomputer but a rentable resource, accessible to enterprises or even malicious actors through a service layer.
Urgency underpins Google’s findings. Transitioning to post-quantum cryptography will take years, and the arrival of capable quantum systems may not come with public fanfare—potentially surfacing first through on-chain exploits. While projects like Algorand, Solana, and the XRP Ledger are exploring post-quantum solutions, legacy assets and dormant wallets pose a persistent challenge.
The bottom line is clear: the window to act is narrowing. With 1.7 million bitcoin already exposed and attack times potentially dropping to single-digit minutes, the crypto industry faces a race against an accelerating technological frontier.
Information for this story was found via the sources and companies mentioned. The author has no securities or affiliations related to the organizations discussed. Not a recommendation to buy or sell. Always do additional research and consult a professional before purchasing a security. The author holds no licenses.
