Coinbase Prepares Post-Quantum Protections for $250B in Assets

The significance here is less about any near-term quantum threat than about where the defensive work is being done: a major custodian, not the Bitcoin protocol itself. That shifts the question from whether Bitcoin's cryptography holds to whether the largest holders of it can retrofit protections without disrupting the assets they safeguard. The open question is whether this stays a single-exchange engineering effort or becomes a broader coordination problem across the industry.