Coinbase Prepares $250B Post-Quantum Bitcoin Custody

What happened: Coinbase, which safeguards approximately $250 billion in institutional assets (including BlackRock’s holdings), is developing a post-quantum custody architecture for Bitcoin. Head of Cryptography Yehuda Lindell confirmed that the company is designing systems agnostic to whichever post-quantum signing scheme Bitcoin ultimately adopts, noting that many such schemes are not compatible with current multi-party computation (MPC) models. Coinbase is exploring fallback architectures such as threshold decryption and programmable hardware security modules (HSMs) to address these challenges.

Why it matters: As quantum computing advances, the risk to existing cryptographic systems increases. Coinbase’s proactive approach highlights both the urgency and complexity of securing digital assets against quantum threats. The lack of a clear industry standard for post-quantum signatures means major custodians must build flexible, forward-compatible solutions, potentially influencing how institutional assets are secured across the sector.

Source: Decrypt