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 imposing a blanket freeze on vulnerable coins, the proposal involves a 'wait and react' strategy that relies on a canary system to detect and respond to quantum attacks. This approach is designed to trigger a network-wide restriction on older bitcoin wallets only if a quantum-capable attacker demonstrates their capabilities on-chain. The system works by placing a small amount of bitcoin in a special address that can only be unlocked by a quantum-capable attacker, with any spend from that address serving as public proof that the threat has arrived and automatically triggering a network-wide freeze of older wallets. The proposal also introduces a financial incentive, allowing users to contribute bitcoin to the address and create a bounty that rewards the first entity to demonstrate a quantum attack publicly. However, this approach rests on the assumption that the first entity capable of breaking Bitcoin would claim the bounty rather than executing a large-scale theft. Critics argue that this bet goes against the network's design principles and may not prevent the worst-case scenario. The proposal is seen as an alternative to BIP-361, a controversial plan that would impose a fixed five-year timeline for phasing out vulnerable addresses and invalidating old signature schemes. The new approach aims to reduce the risk of disrupting users prematurely while providing a more flexible and responsive solution to the quantum computing threat.