Bitcoin Developers Propose 'Wait and React' Strategy to Counter 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 involves waiting for a quantum-capable attacker to demonstrate their capabilities and then reacting accordingly. This 'wait and react' strategy is based 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 attacker succeeds in unlocking the address, it would trigger a network-wide freeze on older wallets. The proposal also includes a bounty system to incentivize 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 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 imposing restrictions on vulnerable wallets, which has been met with criticism from some members of the community. The proposed system aims to balance the need to protect the network from potential threats with the need to preserve the core principles of Bitcoin, including the control of private key holders. The introduction of a 'safety window' is also intended to make stealth attacks more difficult, by allowing vulnerable coins to be moved but not spent for an extended period. If the 'canary' is triggered during this window, the coins would be frozen retroactively, increasing the risk for any attacker attempting to quietly extract funds. While the proposal reduces the risk of disrupting users prematurely, it ultimately rests on the bet that the first entity capable of breaking Bitcoin's security would choose to claim the bounty rather than execute a potentially catastrophic theft.