Bitcoin Developers Propose Alternative Plan to Counter Quantum 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-determined freeze on vulnerable coins, the proposed system would only take action if a quantum-capable attacker demonstrates their capabilities on-chain. This 'canary' system involves placing a small amount of bitcoin in a special address that can only be accessed by a quantum attacker, triggering a network-wide freeze of older wallets if the address is compromised. The proposal also includes a bounty system, where users can contribute bitcoin to incentivize the first entity to demonstrate a quantum attack publicly, rather than attempting to exploit vulnerable wallets. This approach is seen as an alternative to a previously proposed fixed five-year timeline for phasing out vulnerable addresses, which has been criticized for being overly restrictive and potentially undermining the principles of Bitcoin. However, the new proposal relies on the assumption that the first entity capable of breaking Bitcoin's security will choose to claim the bounty rather than carrying out a large-scale theft, which some argue is an uncomfortable bet to make.