Coinbase Preps Post-Quantum Custody for $250B Held for BlackRock After Lindell Flags MPC Blind Spot

Coinbase is engineering a post-quantum custody architecture for roughly $250 billion in institutional assets held for BlackRock and others. Today, its institutional stack runs on multi-party computation (MPC), where private key shares stay split across multiple parties. The move addresses potential quantum computing threats to current cryptographic security.