Executive Summary On March 31, 2026, Google’s Quantum AI team published a whitepaper revealing that breaking the elliptic curve cryptography (ECDSA-256) protecting Bitcoin, Ethereum, and most blockchains could require 20× fewer quantum resources than estimated in 2019 — specifically fewer than 500,000 physical qubits. The research models a real-time transaction … Continue reading Can Quantum Computers Break Bitcoin? | 2026 Google Research