A new Google Quantum AI paper shows that breaking Bitcoin’s elliptic curve signatures could require fewer than 500,000 physical qubits; that is roughly a 20x reduction from prior estimates. It is a real scientific result. But no machine with even 1% of that capacity exists today, and the paper is a resource estimate, not a timeline prediction. The actual story is that migration work is already underway, and the window to act is measured in years, not minutes.