Update
ARK Invest’s Valente Optimistic About Bitcoin Quantum Fix
ARK Invest’s Lorenzo Valente, the company’s Director of Research for Digital Assets, has expressed increased optimism that Bitcoin will deploy a quantum fix before 'Q Day.' This shift in outlook aligns with a white paper co-authored by ARK Invest and Unchained, published on March 12, 2026. The white paper outlines five stages of quantum risk to Bitcoin, suggesting the threat builds gradually rather than arriving suddenly. As of October 11, 2026, approximately 7.1 million BTC, representing about 35% of the circulating supply, has exposed public keys and is vulnerable to an attack using Shor’s algorithm. ARK Invest notes that most Bitcoin addresses use hashed versions of public keys, which are considered resilient to potential quantum attacks. The research highlights the Bitcoin ecosystem’s awareness of the problem and readiness to adopt defensive measures, including draft proposals for new output types like BIP-360.