A recent analysis has spotlighted a startling vulnerability: a sufficiently advanced quantum computer could crack Bitcoin's elliptic curve cryptography in just nine minutes. This 'nine-minute threat' exploits Shor's algorithm, which allows quantum machines to reverse the math behind private keys far faster than classical computers.
Google researchers estimate that fewer than 500,000 physical qubits could execute such an attack. The risk centers on Bitcoin's 10-minute block time—attackers could intercept transactions in the mempool, front-run them, and redirect funds before the network confirms. Even more alarming, over 6.9 million BTC (roughly one-third of the total supply) sit in 'at-rest' wallets where public keys are already exposed, making them prime targets.
While quantum computing remains nascent, the crypto community is urged to prepare by migrating to quantum-resistant algorithms. The clock is ticking for a security upgrade before the nine-minute hack becomes a reality.