Bitcoin Developers Propose a Reactive Approach to Quantum Computing Threats

The Bitcoin community is considering a novel approach to addressing the potential threat of quantum computing to the network's security. Instead of imposing a pre-emptive freeze on vulnerable coins, developers are proposing a 'wait and react' strategy that would only trigger a network-wide restriction if a quantum-capable attacker is detected. This approach, outlined in a recent proposal by BitMEX Research, relies on a 'canary' system that would place a small amount of bitcoin in a special address, which would serve as a trigger for a network-wide freeze if a quantum-capable attacker were to unlock it. The proposal includes a bounty system, where users can contribute bitcoin to the address, creating a financial incentive for the first entity to demonstrate a quantum attack publicly. 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 sparked debate, with some critics arguing that it goes against the network's design principles and historical approach to security threats. The proposal is seen as an alternative to a controversial plan that would impose a fixed five-year timeline for addressing the quantum computing threat, which has been criticized for being 'authoritarian and confiscatory'. The 'canary' system is designed to reduce the risk of disrupting users prematurely, while also introducing a 'safety window' that would make stealth attacks harder to execute. However, the success of this approach hinges on the bet that the first entity capable of breaking Bitcoin would prioritize claiming the bounty over executing a large-scale theft.