Research indicates that quantum-safe bitcoin can now be achieved without a soft fork, though it comes with a price tag of $200 each.
New Approach to Quantum-Secure Bitcoin Transactions Researchers at StarkWare have unveiled what they claim is the first method to achieve quantum-secure Bitcoin transactions on active networks without altering the Bitcoin protocol. However, this approach comes with a hefty price tag, costing as much as $200 per transaction, and is intended primarily as a temporary solution. […]