Researchers at the Center for Cryptocurrency Research and Engineering (IC3E) from Imperial College London have published research on post-quantum Bitcoin security. The new framework, called Compact Shielded Client-Side Validation (CSV), proposes a method to make Bitcoin transfers quantum-proof without requiring a network soft fork.
Previous Quantum Security Proposals
Earlier research from 2018-2020 by the same group, dubbed "Commit-Delay-Reveal," proposed a quantum-secure Bitcoin framework but required a network soft fork and asset migration from vulnerable ECDSA addresses to the quantum-resistant chain using a multi-step time delay. This approach would have demanded network-wide protocol upgrades.
Alternative approaches involving transitions from ECDSA to lattice-based or hash-based cryptography would still require a soft fork, which presents challenges including social and technological coordination difficulties, potential deployment delays, consensus realignment issues, and network congestion from larger signature sizes and Zero-Knowledge proofs.
How the New Framework Works
The CSV framework layers advanced post-quantum cryptographic technology on top of current transaction architectures rather than enforcing changes at the consensus layer. Post-quantum keys, transaction histories, and algorithmic proofs are verified at the peer-to-peer level, while the underlying Bitcoin blockchain remains an immutable ledger.
Participants using this quantum-safe layer are required to download compatible client software to conduct transactions over the Bitcoin network.
Industry Discussions on Quantum Security
The quantum security approach remains a topic of debate within the cryptocurrency community. The crypto community has been encouraged to conduct migrations to quantum-proof addresses carefully to prevent loss of funds.
