Bitcoin Developers Propose a Reactive Approach to Quantum Computing Threats

A novel approach to addressing the potential threat of quantum computing to the Bitcoin network has been proposed, wherein the network would only take action against vulnerable coins if a quantum-capable attacker is detected. This 'wait and react' strategy relies on the attacker claiming a bounty rather than exploiting the vulnerability for personal gain. The proposal 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. This approach is designed to provide an alternative to a previously proposed fixed five-year timeline for implementing security measures, which has been criticized for being overly restrictive. The new proposal includes a financial incentive for the first entity to demonstrate a quantum attack, as well as a 'safety window' to prevent stealth attacks. However, the approach is not without risks, as it assumes that the first entity capable of breaking Bitcoin's security will choose to claim the bounty rather than carrying out a potentially massive theft.