Adam Back, CEO of Blockstream, said quantum computers do not pose an immediate practical risk but urged prompt preparation.

Assessment of current quantum risk

Back noted that existing quantum hardware has not reached capabilities necessary to break Bitcoin’s widely used elliptic curve cryptography, but complacency could increase future vulnerability.

Recommended upgrade approach

He proposed implementing optional protocol upgrades that would enable a gradual migration to quantum-resistant cryptographic algorithms without causing abrupt consensus changes.

Technical and coordination considerations

According to Back, the practical path includes research into post-quantum signatures, designing soft-fork-compatible proposals and coordinating node and wallet adoption across the ecosystem.

Rationale for early action

Early deployment of optional mechanisms would allow users and services to adopt quantum-resistant keys over time, reducing systemic risk while preserving backward compatibility.

Conclusion

Back’s recommendation emphasizes preparatory work and optional migration tools as prudent measures to address potential future quantum threats to Bitcoin.