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

A recent proposal is sparking debate among Bitcoin developers, suggesting a shift in the network's approach to addressing the potential threat of quantum computing. Instead of imposing a pre-scheduled freeze on vulnerable coins, the new plan proposes a 'wait and react' strategy that only triggers a network-wide restriction if a quantum-capable attacker demonstrates their capabilities on-chain. This approach is designed to mitigate the risk of premature disruption to users, but it relies on the assumption that the first entity to demonstrate a quantum attack will claim a bounty rather than exploiting the vulnerability for financial gain. The proposal outlines 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, triggering a network-wide freeze of older wallets if the address is accessed. This approach is seen as an alternative to BIP-361, a controversial proposal that would impose a fixed five-year timeline for phasing out vulnerable addresses, regardless of whether quantum computers are actually capable of attacking Bitcoin's blockchain. Critics of BIP-361 argue that it undermines Bitcoin's core principle of control resting with private key holders, and could result in the permanent freezing of unmigrated coins. The new proposal introduces a financial incentive, allowing users to contribute to a bounty that rewards the first entity to demonstrate a quantum attack, while also providing a 'safety window' to make stealth attacks more difficult. However, the success of this approach hinges on the bet that the first entity capable of breaking Bitcoin would claim the bounty rather than executing a potentially catastrophic theft.