Avihu Levy, Starkware's CPO, published QSB on April 9, 2026, enabling quantum-safe Bitcoin transactions using existing script rules at $75-150 per tx, no softfork needed.

Avihu Levy, Chief Product Officer at Starkware, published QSB—a quantum-safe Bitcoin transaction scheme built on existing protocol rules. It achieves ~118-bit pre-image resistance against quantum attacks using RIPEMD-160 hashing, with off-chain GPU costs of $75–$150 per transaction. No softfork or consensus change required.

Avihu Levy of Starkware has introduced QSB, a research-backed method for creating quantum-safe Bitcoin transactions using existing Bitcoin rules, though deployment remains limited by relay policy, wallet support, and engineering constraints.

Starkware CPO Avihu Levy introduced QSB, a quantum-safe Bitcoin transaction scheme built entirely from existing Bitcoin rules, though the approach still faces relay, cost, and wallet adoption hurdles.

Starkware CPO Avihu Levy has introduced QSB, a scheme designed to make Bitcoin transactions quantum-safe using existing script rules, without soft forks or new opcodes, though deployment hurdles remain significant.

StarkWare researcher Avihu Levy proposes Quantum Safe Bitcoin (QSB), enabling quantum-resistant transactions without a soft fork. Each transaction costs up to $200, acting as an emergency measure until protocol upgrades arrive.

StarkWare researcher proposes QSB, the first quantum-safe Bitcoin transaction method without protocol changes, costing $75-$200 per transaction as an emergency measure.

StarkWare researcher proposes QSB, enabling quantum-safe Bitcoin transactions without a soft fork. Each transaction costs $75-$200, designed as an emergency measure, not a permanent fix.