A fresh rift is opening in Bitcoin’s ranks over how to respond to the growing specter of quantum computing — and Blockstream CEO Adam Back is arguing for a calm, optional approach rather than urgent, mandatory fixes.
Speaking at Paris Blockchain Week, Back urged developers to begin building optional, quantum-resistant upgrades now, even while quantum machines remain “essentially lab experiments” whose progress has been “incremental” over the 25 years he’s followed the field. “Preparation is key. Making changes in a controlled way is far safer than reacting in a crisis,” he said, pointing to Blockstream’s experiments with quantum-resistant signatures on Liquid, Bitcoin’s federated sister network.
Back also highlighted Bitcoin’s Taproot upgrade as having been designed with sufficient flexibility to accept new signature schemes without disrupting existing users. He has previously suggested users should have roughly a decade to migrate keys to quantum-resistant formats.
That stance comes in direct contrast to BIP-361, a proposal published Tuesday by Jameson Lopp and five other developers, which would impose a fixed five-year timeline to phase out quantum-vulnerable addresses and automatically freeze any coins that fail to migrate. The proposal would affect roughly 1 million bitcoins attributed to Satoshi Nakamoto and, according to Lopp, about 5.6 million coins that have not moved in over a decade.
Back’s position can be read as the implicit alternative to Lopp’s forced migration. He argues Bitcoin’s governance — ad hoc, “rough-consensus” coordination — can marshal quick action in an emergency: “Bugs have been identified and fixed within hours. When something becomes urgent, it focuses attention and drives consensus,” he said. Lopp, on the other hand, contends developers may not be able to move quickly enough if a quantum breakthrough arrives, and that pre-scheduled protections are necessary to avoid an uncoordinated, chaotic migration.
The debate has shifted from theoretical to urgent after a recent Google–Caltech paper suggested that functional quantum computers capable of undermining Bitcoin’s cryptography could arrive sooner than previously expected. That warning has prompted developers, companies and users to weigh the tradeoffs between forethought and enforced timelines — and to consider the governance and practical risks of freezing potentially millions of bitcoins versus relying on emergency coordination when (or if) the threat materializes.
For now, Bitcoin’s quantum future remains uncertain, and the community is split between gradual, optional upgrades and a hard, timebound migration plan. The coming months will likely determine whether consensus forms around voluntary preparedness or mandatory safeguards.
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