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 implementing a pre-emptive freeze on vulnerable coins, the proposal suggests waiting for a quantum-capable attacker to demonstrate their capabilities and then triggering a network-wide response. This 'wait and react' strategy relies 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 attacker unlocks the address, it would serve as public proof that the threat is real, triggering a network-wide freeze of older wallets. The proposal also includes a financial incentive, allowing users to contribute to a bounty that would reward the first entity to demonstrate a quantum attack publicly. However, this approach assumes that the attacker will claim the bounty rather than exploiting the vulnerability for personal gain, which may not be a reliable assumption. The proposal is designed to provide an alternative to a fixed five-year timeline for addressing quantum computing threats, which has been criticized for being 'authoritarian and confiscatory.' The new approach aims to balance the need to protect the network with the need to respect the principles of user control and autonomy that underpin the Bitcoin protocol.