Inside Coinbase’s $250 Billion Playbook for Post-Quantum Bitcoin Custody
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If a cryptographically relevant quantum computer eventually becomes an active threat to Bitcoin's security, Coinbase wants to have protections in place that are prepared for whatever direction Bitcoin and other digital assets take, according to Yehuda Lindell.
Key facts
- Safeguarding roughly $250 billion in assets on behalf of institutions such as BlackRock, Coinbase has spent years refining associated procedures
- While Bitcoin's native scripting language allows users to create multi-signature setups by enforcing quorum rules directly on-chain, MPC operates off-chain using specific cryptographic functions
- Concerns about hash-based signatures have also been raised by wallet developers including Ledger CTO Charles Guillemet
- If Bitcoin adopts a post-quantum scheme incompatible with MPC, Coinbase is researching a fallback architecture centered on programmable Hardware Security Modules (HSMs)—digital vaults for encrypted
Summary
Coinbase is developing post-quantum custody safeguards to support a wide range of signature schemes, according to Head of Cryptography Yehuda Lindell. Traditional Multi-Party Computation (MPC) relies on split keys, but many post-quantum signature schemes may be “non-MPC-friendly.” Coinbase is exploring a fallback architecture that combines post-quantum threshold decryption with programmable Hardware Security Modules (HSMs). In a recent appearance on MARA Foundation TV, the crypto exchange’s head of cryptography told host Isabel Foxen Duke that the company’s post-quantum safeguards are being designed to support any potential forms of technical retooling.