Public key recovery for EC leaves in P2MR (BIP-360)

The discussion on the BIP32 standard and its application to EC keys in the context of P2MR reveals significant concerns regarding security and complexity. It is evident that applying BIP32 standards to new protocols such as EC-P2MR would present numerous challenges. The risks associated with such an implementation could deter user migration due to heightened complexities and a shift from traditional wallet concepts. This change demands users to adapt to completely new definitions of what constitutes a wallet, which may prove too burdensome for widespread acceptance.

Furthermore, the integration of BIP32 into the current ecosystem underscores its foundational role in supporting various cryptographic services and operations. These include multisig functionalities, escrow services, software watch-only wallets that utilize descriptors, and wallet indexing services. The survival of coins post-Q-day in an EC-P2MR setting without resorting to an EC-disabling consensus change appears highly improbable. This scenario suggests that maintaining the current infrastructure, heavily reliant on xpub and public key sharing, is critical unless substantial modifications are made to ensure compatibility and security in the face of quantum computing advancements.