Bitcoin Developers Propose a Reactive Approach to Mitigate Quantum Computing Threats

The Bitcoin community is discussing a novel approach to address the potential threat of quantum computing to the network's security. Instead of implementing a pre-scheduled freeze on vulnerable coins, the proposal involves a 'canary' system that triggers a network-wide restriction only when a quantum-capable attacker is detected. This system works by placing a small amount of bitcoin in a special address that can only be unlocked by a quantum-capable attacker, serving as proof that the threat has arrived and triggering a network-wide freeze. The proposal is designed to provide an alternative to a fixed five-year timeline for imposing restrictions, which has been met with criticism for being 'authoritarian and confiscatory.' A key aspect of the proposal is a financial incentive, where users can contribute to a bounty that rewards the first entity to demonstrate a quantum attack publicly. However, this approach relies on the assumption that the first entity capable of breaking Bitcoin's security would claim the bounty rather than executing a large-scale theft. This assumption has raised concerns, as it goes against the network's design principle of preventing worst-case scenarios. If the assumption fails, Bitcoin may face the worst of both worlds - the catastrophe it was trying to prevent, and the realization that a fixed-timeline defense would have been more effective.