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

The Bitcoin community is considering a novel approach to address the potential threat of quantum computing to the network's security. Instead of implementing a pre-emptive freeze on vulnerable coins, the proposed 'canary' system would trigger a network-wide response only if a quantum-capable attacker demonstrates their capabilities on-chain. This approach is based on a 'wait and react' strategy, where a small amount of bitcoin is placed in a special address that can only be unlocked by a quantum-capable attacker, serving as a public proof of the threat and automatically triggering a network-wide freeze of older wallets. The proposal includes a financial incentive, allowing users to contribute to a bounty that rewards the first entity to demonstrate a quantum attack, rather than attempting to exploit the vulnerability for personal gain. 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 potentially massive theft. This assumption has raised concerns, as it goes against the network's historical emphasis on preventing worst-case scenarios and minimizing the need for protocol-level interventions. If the assumption proves incorrect, Bitcoin may face the worst of both worlds: the catastrophic consequences of a successful attack and the realization that a more proactive defense strategy could have prevented it.