Bitcoin Developers Propose Quantum Defenses, Potentially Freezing Vulnerable Coins

The promise of Bitcoin's security is being reevaluated as developers propose measures to defend against future quantum computers that could compromise the blockchain. A recently updated proposal, Bitcoin Improvement Proposal (BIP)-361, suggests forcing bitcoin holders to migrate their coins to new quantum-resistant addresses or risk having them frozen permanently. 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 has sparked backlash from the community, with some citing it as authoritarian and confiscatory, while developers argue it is a necessary defensive measure. The BIP-361 proposal outlines a three-phase migration process, starting with blocking new bitcoin from being sent to old-style addresses, followed by rendering old-style signatures invalid, and potentially introducing a rescue phase using zero-knowledge proofs to recover frozen coins.