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: rather than imposing a pre-emptive freeze on vulnerable coins, the network would wait for an attacker to demonstrate their capabilities and then react. This 'wait and react' strategy relies 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 address is accessed, it would trigger a network-wide freeze of older wallets. The proposal includes a bounty system, where users can contribute bitcoin to incentivize the first entity to demonstrate a quantum attack, rather than exploiting vulnerable wallets for personal gain. However, this approach assumes that the attacker will prioritize claiming the bounty over executing a large-scale theft. The 'canary' system is designed to provide an alternative to a fixed five-year timeline for imposing restrictions on older bitcoin wallets, which has been met with criticism for being 'authoritarian and confiscatory.' The new proposal aims to balance the need to protect the network with the principle of giving control to private key holders. A 'safety window' is also introduced, which would restrict the movement of vulnerable coins for an extended period, making it more difficult for attackers to quietly drain wallets. While this approach reduces the risk of disrupting users prematurely, it relies on the assumption that the first entity capable of breaking Bitcoin's security would choose to claim the bounty rather than execute a massive theft. This bet goes against the network's historical emphasis on preventing worst-case scenarios, and the potential consequences of failure could be catastrophic.