Bitcoin Developers Propose 'Wait and React' Strategy to Counter Quantum Computing Threats

The Bitcoin community is considering a novel approach to addressing potential quantum computing threats. Instead of implementing a pre-emptive freeze on vulnerable coins, the proposal suggests waiting for an attacker to demonstrate their capabilities and then reacting accordingly. This 'wait and react' strategy relies on a 'canary' system, where a small amount of bitcoin is placed in a special address that can only be unlocked by a quantum-capable attacker. If the address is accessed, it would trigger a network-wide freeze on older wallets. The proposal also includes a bounty system, where users can contribute bitcoin to incentivize the first attacker to come forward, rather than exploiting the vulnerability for personal gain. However, this approach assumes that the attacker will prioritize claiming the bounty over maximizing their profits through theft. The 'canary' system is designed to provide an alternative to a fixed five-year timeline for implementing restrictions on older bitcoin wallets, which has been met with criticism for being 'authoritarian and confiscatory'. The new proposal aims to strike a balance between mitigating the risks associated with quantum computing and preserving the core principles of the Bitcoin network. A 'safety window' is also introduced, which would restrict the movement of vulnerable coins for an extended period, making it more difficult for attackers to quietly drain wallets. While the proposal reduces the risk of disrupting users prematurely, it 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, as it goes against the network's historical approach to preventing worst-case scenarios. If the assumption proves incorrect, Bitcoin may face the worst of both worlds – the catastrophic consequences of a quantum attack and the realization that a fixed-timeline defense could have prevented it.