Update
Coinbase Prepares for Post-Quantum Bitcoin Security
Coinbase has outlined its needs for a new digital signature scheme for Bitcoin that can accommodate limited block space and is suitable for both custodians and everyday wallets. The exchange is actively engaging with Bitcoin developers and exploring hybrid signature arrangements to prepare for the transition to post-quantum security. Concerns about stateful post-quantum signatures and potential forgery are also discussed, along with strategies for wallets that might be left behind if ECDSA and Schnorr signatures are phased out.