Bitcoin Developers Propose 'Wait and React' Strategy to Counter Quantum Computing Threat

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 proposal involves waiting for an attacker to demonstrate their capabilities and then responding accordingly. 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 attacker succeeds in unlocking the address, it will trigger a network-wide freeze on older wallets. The proposal also includes a bounty system, where users can contribute bitcoin to incentivize the first entity to demonstrate a quantum attack, rather than exploiting the vulnerability for personal gain. However, this approach assumes that the attacker will prioritize claiming the bounty over maximizing their profits through theft. This assumption has raised concerns, as it goes against the network's core principle of prioritizing security and minimizing the risk of catastrophic events. The proposal is seen as an alternative to BIP-361, which suggests a fixed five-year timeline for phasing out vulnerable addresses and invalidating old signature schemes. Critics have argued that BIP-361's approach is overly restrictive and could lead to the permanent freezing of unmigrated coins, undermining the network's decentralized nature. The 'canary' system, on the other hand, aims to balance the need for security with the need for flexibility and adaptability in the face of emerging threats. Nevertheless, the success of this approach hinges on the attacker's behavior, and the network's ability to respond effectively in the event of a quantum attack.