Bitcoin's quantum debate splits as Adam Back pushes optional upgrades over forced freeze

The Blockstream CEO told Paris Blockchain Week that Bitcoin should build quantum-resistant upgrades now, a day after Jameson Lopp proposed freezing vulnerable coins instead. What to know : Bitcoin developer Adam Back argues that the network should begin adding optional quantum-resistant features now, even though practical quantum computers remain years away. A new proposal known as BIP-361 would phase out quantum-vulnerable addresses over five years and freeze coins that do not migrate, including Satoshi Nakamoto’s and millions of long-dormant bitcoins. The debate centers on whether Bitcoin should rely on rapid, emergency coordination if quantum threats materialize or pre-schedule strict measures like address freezes to force an orderly migration.