Coldcard Entropy Flaw Exposes Single-Sig Risks; Multi-Sig Becomes New Bitcoin Custody Baseline

This incident shifts the custody conversation from hardware reliability to systemic key-management design. The flaw's impact is less about one device and more about how it exposes the fragility of single points of failure in Bitcoin storage. For institutional and high-net-worth holders, the takeaway is structural: the baseline for secure custody is moving toward multi-sig architectures that distribute trust across independent keys and devices. The open question is whether this event accelerates adoption of multi-sig as a default standard, and how hardware vendors respond to restore confidence in single-device solutions. What matters next is whether the industry codifies multi-sig requirements in custody best practices, not just for exchanges but for individual holders managing significant assets.