Researchers at the Center for Cryptocurrency Research and Engineering (IC3E) from Imperial College London have published major research on post-quantum Bitcoin security. The paper proposes a model that would make Bitcoin transfers private and quantum-proof, all without the need for a soft fork.
Bitcoin’s quantum resistance proposals
Back in 2018-2020, the group’s research dubbed “Commit-Delay-Reveal” proposed a similar quantum-secure Bitcoin framework.
While clever, it required a network soft fork and thereafter asset migration from vulnerable ECDSA addresses to the quantum-resistant chain using a multi-step time delay. The method would also have demanded network-wide protocol upgrades and triggered heated debates among developers.
An alternative was the traditional way of transitioning from ECDSA to lattice-based or hash-based alternatives. However, this would still demand a soft fork, which is socially and technologically difficult to coordinate. The model would also likely cause deployment delays, consensus realignment issues, and network congestion due to larger signature sizes/Zero-Knowledge (ZK) proofs.
What the latest research shows
The group’s newest “Compact Shielded Client-Side Validation (CSV)” framework is a grand breakthrough that eliminates the soft fork challenge.
Rather than enforcing changes at the consensus layer, it layers advanced post-quantum cryptographic technology on top of current transaction architectures.
This means that all bulky post-quantum keys, transaction histories, and algorithmic proofs would get verified at the peer-to-peer level. The underlying Bitcoin blockchain becomes an immutable ledger rather than a computational engine.
Note that using this quantum-safe layer requires clients to download compatible client software to conduct transactions over the Bitcoin network.
Recent events in the quantum space
More recently, Ethereum’s co-founder Vitalik Buterin and Cardano’s founder Charles Hoskinson had a disagreement surrounding quantum security mechanisms. Vitalik supported hashes while Hoskinson bet on lattices.
Despite the debate, the crypto community is encouraged to conduct any migrations to quantum-proof addresses in a meticulous manner to prevent loss of funds.
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