Bitcoin Developers Propose Quantum Defenses, Potentially Freezing Vulnerable Coins

The promise of Bitcoin has always been that users have full control over their coins, with no external entity able to touch them without the private key. However, this promise is now being challenged by the developer community as they attempt to build defenses against future quantum computers that could compromise the Bitcoin blockchain. A recent proposal, Bitcoin Improvement Proposal (BIP)-361, suggests forcing bitcoin holders to migrate their coins to new quantum-resistant addresses or face having their coins frozen permanently by the network. This move is in response to a Google report warning that a sufficiently powerful quantum machine could compromise the Bitcoin blockchain with less firepower than initially estimated. The proposal outlines a three-phase migration plan, starting with blocking new bitcoin from being sent to old-style, quantum-vulnerable addresses, followed by rendering old-style signatures invalid, and finally, a potential rescue phase where holders with frozen wallets could prove ownership using a zero-knowledge proof. The community has pushed back against the proposal, citing concerns over the authoritarian and confiscatory nature of freezing coins, while developers argue it is a necessary defensive measure to protect the Bitcoin ecosystem.