Coinbase Advances Post-Quantum Bitcoin Custody

Coinbase is developing post-quantum Bitcoin custody infrastructure to protect about $250 billion in institutional crypto assets and support multiple digital-signature standards. Chief Cryptographer Yehuda Lindell said Bitcoin has not adopted a single post-quantum standard, so the exchange is preparing for several possible schemes. The project addresses limits in multi-party computation (MPC), which Coinbase currently uses extensively. Some post-quantum signatures, especially hash-based designs, may not work with conventional MPC. Coinbase is therefore researching programmable hardware security modules (HSMs) that can assemble encrypted private keys inside protected devices. HSMs would complement MPC, although they could be less secure if a complete key exists temporarily. Coinbase is also studying ML-DSA support and address migration. Its quantum advisory board has urged Bitcoin developers to create migration tools before quantum computers can threaten existing cryptography. Bitcoin has no approved post-quantum migration plan, while proposals such as BIP 360 and BIP 361 remain inactive. Coinbase counts BlackRock and other institutions among its custody clients. A separate U.S. review estimated its institutional assets at about $376 billion and said it safeguards more than 80% of assets held by U.S. spot Bitcoin and Ethereum ETFs. These figures may use different periods and definitions. For traders, Coinbase’s post-quantum Bitcoin custody initiative is a long-term security and infrastructure development. It could support institutional confidence and reduce future upgrade risks, but it does not immediately change Bitcoin’s rules, supply, liquidity or market valuation.