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

The Bitcoin community is discussing a significant shift in its approach to addressing the potential threat of quantum computing. Instead of implementing a pre-emptive freeze on vulnerable coins, developers are considering a 'wait and react' strategy that would only trigger a network-wide restriction if a quantum-capable attacker demonstrates their capabilities. This approach is based on a 'canary' system, which involves placing a small amount of bitcoin in a special address that can only be unlocked by a quantum-capable attacker. If the address is accessed, it would serve as public proof that the threat is real and automatically trigger a network-wide freeze. The proposal also includes 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 sparked debate, as it goes against the network's design principle of preparing for worst-case scenarios. The proposal is seen as an alternative to BIP-361, which suggests imposing restrictions on a fixed five-year timeline, regardless of whether quantum computers are capable of attacking the blockchain. Critics argue that BIP-361's approach is 'authoritarian and confiscatory,' as it would undermine Bitcoin's core principle of private key holders being in control. The 'canary' system is designed to reduce the risk of disrupting users prematurely, but it introduces a new risk - that the first entity capable of breaking Bitcoin's security might choose to exploit the network rather than claim the bounty.