Bitcoin Developers Propose Alternative Quantum Attack Plan

The Bitcoin community is considering a novel approach to addressing the potential threat of quantum computing to the network's security. Instead of imposing a pre-emptive freeze on vulnerable coins, the proposal involves creating a 'canary' system that would trigger a network-wide response only if a quantum-capable attacker demonstrates their capabilities on-chain. This approach is designed to provide an alternative to a fixed five-year timeline for implementing restrictions, which has been met with criticism for being overly restrictive. The canary system would involve placing a small amount of bitcoin in a special address that can only be unlocked by a quantum-capable attacker, with the spend from that address serving as public proof that the threat has arrived. This would automatically trigger 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 relies on the assumption that the first entity capable of breaking Bitcoin's security would claim the bounty rather than executing a large-scale theft. This assumption has raised concerns, as it goes against the network's design principles and historical resistance to protocol-level interventions. If the bet fails, Bitcoin may face the worst of both worlds, experiencing the catastrophe it was trying to prevent while also realizing that a fixed-timeline defense could have stopped it.