Bitcoin Developers Propose Quantum Defenses, Potentially Freezing Vulnerable Coins

The promise of Bitcoin has always been that no one can access your coins without your private key. However, this promise is now being challenged by the developer community as they try to build defenses against future quantum computers that could compromise the Bitcoin 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 by the network. This proposal has sparked controversy within the community, with some citing it as a violation of Bitcoin's fundamental principle of sovereign control over funds. The proposal is a response to a recent Google report warning that a sufficiently powerful quantum machine could compromise the Bitcoin blockchain with less firepower than initially estimated. Every Bitcoin wallet is secured by a form of cryptography called ECDSA, but a sufficiently powerful quantum machine can use the public key to reverse engineer the private key and drain funds. As of March, approximately 6.7 million BTC were in vulnerable addresses. The proposal structures the migration in three phases, with the first phase blocking new bitcoin from being sent to old-style addresses, the second phase rendering old-style signatures invalid, and the third phase potentially allowing holders to prove ownership and recover frozen coins. The community has pushed back against the proposal, calling it authoritarian and confiscatory, while developers argue it is a necessary defensive measure to protect the Bitcoin ecosystem.