Bitcoin Developers Propose 'Wait and React' Strategy to Counter Quantum 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 system would wait for a quantum-capable attacker to demonstrate their capabilities and then trigger a network-wide response. This 'wait and react' strategy relies on a 'canary' mechanism, where a small amount of bitcoin is placed in a special address that can only be unlocked by a quantum attacker. If the attacker claims the bounty, the network would automatically freeze older wallets, preventing potential theft. However, this approach assumes that the attacker would prioritize claiming the bounty over maximizing their gains through stealthy exploitation. The proposal is designed to provide a more flexible and user-centric alternative to the controversial BIP-361, which would impose a fixed timeline for security upgrades. Critics of BIP-361 argue that it could lead to an 'authoritarian and confiscatory' outcome, undermining Bitcoin's core principles. The new proposal introduces a financial incentive for users to contribute to the 'canary' address, creating a bounty for the first entity to demonstrate a quantum attack. Additionally, a 'safety window' is proposed to make stealth attacks more difficult, allowing for the retroactive freezing of vulnerable coins if the 'canary' is triggered. While this approach reduces the risk of premature disruption to users, it relies on a bet that the first quantum-capable attacker will prioritize the bounty over executing a potentially catastrophic theft. If this bet fails, Bitcoin may face the worst of both worlds – the devastating consequences of a successful attack and the realization that a more proactive defense could have prevented it.