Bitcoin Exchanges Can Reduce Quantum Risks Before Network Upgrade
Coinbase Workshop Highlights Quantum Challenges for Exchanges
A workshop hosted by Coinbase in September 2026 focused on how Bitcoin exchanges can reduce their exposure to quantum computing risks before any network upgrade. The closed-door session, which included developers, cryptographers, institutional custodians, and hardware-wallet experts, did not reach a consensus on the exact post-quantum approach. However, it emphasized that exchanges can take immediate steps to lower risks.
Key Takeaways from the Discussion
- Coinbase's workshop had no agreement on Bitcoin's post-quantum strategy.
- Exchanges can reduce public-key exposure right now by improving address and custody practices.
- Draft BIP-360 targets long-term exposure, while post-quantum signatures and dormant holdings remain separate challenges.
What Coinbase's Workshop Revealed
Coinbase reported that the workshop identified tradeoffs involving transaction size, hardware performance, key management, and adoption. Participants included experts from various fields, but no single solution was chosen. Coinbase stated that the quantum risk is not immediate, as no current quantum computer can break Bitcoin's signatures.
Glassnode Data Shows Scale of Exchange Exposure
A Glassnode study from May 2026 measured that about 1.6 million BTC in exchange-related outputs had visible public keys on-chain. This is part of the 6.04 million BTC with public-key exposure at rest, which includes coins where the key is already visible. The data suggests that exchanges can shrink this exposure through operational changes like address hygiene and reserve management.
Google Quantum AI Highlights Migration Limits
A March 2026 paper from Google Quantum AI separated active Bitcoin holdings that can be migrated from abandoned or inaccessible assets. Protocol changes can create safer options, but they cannot force absent keyholders to sign transactions. This distinction matters for understanding the hardest parts of quantum migration.
Confirmed Facts from the Sources
The Coinbase workshop took place and involved experts from multiple fields. No consensus was reached on a post-quantum method. Glassnode data confirms approximately 1.6 million BTC in exchange-related outputs with visible public keys. No cryptographically relevant quantum computer exists today that can break Bitcoin's signatures.
Uncertainties and Ongoing Challenges
The exact post-quantum signature scheme is not yet decided. Migrating dormant or lost Bitcoin remains a challenge, as protocol changes cannot make inactive keyholders act. The implementation timeline and adoption of BIP-360 are unclear.
Why This Matters for Bitcoin Security
Exchanges can act now to reduce quantum risks by managing addresses and custody practices. This operational readiness is important before any network-wide upgrade, as it helps protect the Bitcoin ecosystem while quantum technology develops.
Next Steps in Quantum Preparedness
The development of BIP-360 and post-quantum signature proposals continues. Exchanges and custodians will need to adopt new practices and technologies as they become available, but specific timelines are not provided in the sources.