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

The Bitcoin community is exploring 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, developers are considering a 'wait and react' strategy. This approach involves placing a small amount of bitcoin in a special address that can only be unlocked by a quantum-capable attacker, triggering a network-wide freeze of older wallets if the address is accessed. The proposal, put forth by BitMEX Research, includes a bounty system to incentivize the first entity to demonstrate a quantum attack, rather than exploiting the vulnerability for personal gain. However, this strategy relies on the assumption that the attacker will claim the bounty instead of attempting a large-scale theft. This assumption has sparked debate, as it contradicts the network's historical emphasis on preventing worst-case scenarios. The proposal is an alternative to the controversial BIP-361, which would impose a fixed five-year timeline for phasing out vulnerable addresses. Critics argue that BIP-361's approach is authoritarian and confiscatory, undermining Bitcoin's core principle of private key holder control. The 'canary' system, on the other hand, aims to balance the need for security with the need to minimize disruption to users. The system also includes a 'safety window' to make stealth attacks more difficult, allowing vulnerable coins to be frozen retroactively if the canary is triggered. While this approach reduces the risk of premature disruption, it ultimately relies on the bet that the first entity capable of breaking Bitcoin will prioritize the bounty over a potentially massive theft.