Coinbase is designing adaptive post-quantum custody infrastructure for Bitcoin to prepare for future cryptographic standards.
Regulation & Gov ·
Coinbase is preparing custody infrastructure to safeguard against future quantum computing threats to Bitcoin, according to the exchange's Head of Cryptography Yehuda Lindell. The company is designing systems flexible enough to support whichever post-quantum signature scheme Bitcoin ultimately adopts, as it currently remains unclear what standard will be used across different blockchains. With approximately $250 billion in assets under custody, Coinbase has emphasized the need for adaptive security across multiple potential technical approaches.
Traditional custody relies on Multi-Party Computation (MPC), which splits private keys across multiple parties so no single device holds complete signing authority. However, many post-quantum signature schemes—particularly hash-based signatures—may be incompatible with this architecture because they lack the mathematical structure required for key-splitting. Lindell noted that certain post-quantum options could make MPC infrastructure either extremely difficult or impossible to implement, despite offering strong protection against quantum threats.
In response, Coinbase is exploring a fallback architecture combining post-quantum threshold decryption with programmable Hardware Security Modules. Research into MPC-compatible hash-based signatures remains experimental, leaving open whether viable solutions can be developed before quantum threats materialize. The timeline and ultimate viability of Coinbase's fallback approach have not been specified.