Coinbase Prepares $250B Post-Quantum Bitcoin Custody

What happened: Coinbase, custodian of approximately $250 billion in assets, is developing a post-quantum secure custody system for Bitcoin and other digital assets. Head of Cryptography Yehuda Lindell explained that traditional multi-party computation (MPC) may not be compatible with future post-quantum signature schemes. Coinbase's PQ-CoreKMS architecture will use programmable hardware security modules and post-quantum threshold decryption, aiming for automated, adaptable signing pipelines within the next year.

Why it matters: As quantum computing advances, the risk to current cryptographic signatures grows. Coinbase's proactive approach—advised by a council including leading cryptographers—positions it as a potential standard-bearer for institutional-grade, quantum-resistant custody. However, the Bitcoin protocol has not yet selected a post-quantum signature scheme, so Coinbase's solution remains agnostic and somewhat speculative until standards solidify.

Source: Decrypt