Google Quantum AI demonstrated a method on March 31, 2026 that cracks Bitcoin and Ethereum cryptography ten times faster using fewer than 1,200 logical qubits. The disclosure sparked immediate replication efforts and forced blockchain projects to reconsider post-quantum migration deadlines.
March 31 Breakthrough
Google's team showed their optimization in a private lab demo. It slashed qubit requirements to under 1,200, a threshold previously thought years away. The method specifically targeted elliptic curve cryptography used by major blockchains.
Leak and Rebuild
French researcher André Schrottenloher reconstructed Google's quantum attack within two months of its undisclosed release. U.S. officials then blocked full publication of the zero-knowledge proof, calling it a national security risk. That decision ignited fierce debate over quantum research transparency.
Hobbyist Replication
Amateur coders and AI systems quickly weaponized the leaked proof. They used it as a feedback tool for automated search algorithms, accelerating their own quantum attack models. The technique spread through crypto forums within weeks.
Timeline Dispute
Justin Drake now estimates a 50 percent chance of quantum decryption capability by 2032 and 10 percent by 2030. He called the U.S. government's 2035 deadline outdated, pointing to hobbyist acceleration as proof the timeline has shifted.
Ethereum's Response
The Ethereum Foundation and partners are pushing to complete their post-quantum migration using hash-based cryptography by 2029. That target moves three years ahead of previous industry estimates but may still be too late. Their next public roadmap update arrives later this month.
