ChainCatcher report, according to Bitcoin Magazine, StarkWare’s Avihu Levy has published a research proposal titled “Quantum-Safe Bitcoin Transactions Without a Soft Fork,” introducing a quantum-safe Bitcoin scheme called QSB. The scheme aims to make Bitcoin transactions resistant to quantum computing attacks without altering Bitcoin’s core rules. QSB replaces elliptic curve cryptography with hash-based assumptions, shifting security to hash preimage resistance to counter threats from Shor’s algorithm. The scheme operates within Bitcoin’s existing script constraints and requires no consensus changes or soft forks. However, QSB transactions exceed standard relay policy limits and cannot propagate through the network under default settings; they must be submitted directly to miners via services such as Slipstream. The paper estimates the cost of generating valid transactions using cloud GPUs at approximately $75 to $150. The full transaction assembly and broadcasting process for this project has not yet been demonstrated on-chain.
New Research Proposes Quantum-Safe Bitcoin Transactions Without Protocol Changes
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Summary
StarkWare's Avihu Levy has proposed a new method to secure Bitcoin transactions against quantum threats without requiring protocol changes. The QSB scheme replaces elliptic curve cryptography with hash function-based assumptions, leveraging preimage resistance to defend against Shor’s algorithm. The design is compatible with Bitcoin’s script constraints and avoids the need for a soft fork. However, QSB transactions exceed standard relay limits and require direct submission by miners. Estimated transaction costs using cloud GPUs range from $75 to $150. On-chain testing has not yet been conducted.
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