Bitcoin Developers Propose Reactive Strategy to Counter Quantum Threats

The Bitcoin community is considering a novel approach to mitigate the risks associated with quantum computing. Instead of imposing a pre-emptive freeze on vulnerable coins, the proposal involves a 'canary' system that triggers a network-wide restriction only when a quantum-capable attacker demonstrates their capabilities. This 'wait and react' strategy relies on placing a small amount of bitcoin in a special address that can only be unlocked by a quantum attacker, thereby serving as proof of the threat and automatically triggering a network-wide freeze of older wallets. The approach is designed to provide an alternative to a fixed five-year timeline for restrictions, which has been met with criticism for being 'authoritarian and confiscatory.' A key aspect of the proposal is the introduction of a financial incentive, where users can contribute to a bounty that rewards the first entity to demonstrate a quantum attack publicly, rather than secretly exploiting vulnerable wallets. However, this approach rests 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 proves incorrect, 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.