Is Bitcoin's Q-Day a Decade Away? Even Skeptics Say It's Running Late

Casa security chief Jameson Lopp says a quantum computer able to break Bitcoin (BTC) is orders of magnitude away. Yet the same skeptic warns that preparations for Bitcoin’s Q-Day are already running late. That tension puts about 2.6 million BTC, worth roughly $207 billion, at the center of the debate. Those coins sit in addresses that may never move to quantum-safe cryptography. How Far Away Is Bitcoin’s Q-Day, Really? Casa provides multi-key Bitcoin custody. In a recent interview, Lopp argued that closing the gap would take several massive breakthroughs. The hardware supports his view. Google’s Willow chip runs on 105 qubits. In March, Google estimated that cracking Bitcoin’s signatures would need fewer than 500,000. That is a gap of more than 4,700-fold. However, Lopp added a caveat.

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