Coinbase Calls for Flexible Bitcoin Quantum-Security Upgrades

Coinbase is urging Bitcoin developers to prepare for quantum-resistant signatures before a cryptographically relevant quantum computer is announced, with designs that can accommodate the signing systems used by large custodians. The exchange estimates it holds about 5% of all Bitcoin (BTC). It also says changes to Bitcoin’s consensus rules and the later movement of funds could take years, making early planning important. Coinbase favors an output type that would allow post-quantum signature schemes to be added or replaced without redesigning the system.