"Quantum Safe Bitcoin (QSB) is the first known scheme to secure live bitcoin transactions against Shor's algorithm using only Bitcoin's existing legacy Script rules, requiring no softfork or community coordination."
"Levy's scheme costs between $75 and $150 in GPU compute per transaction and achieves approximately 118-bit pre-image resistance against quantum attacks, significantly enhancing Bitcoin's security."
"QSB severs the dependency on elliptic curve hardness by building security on the pre-image resistance of RIPEMD-160, which quantum computers can only attack with Grover's algorithm."
Quantum Safe Bitcoin (QSB) was introduced by Starkware's Avihu Levy on April 9, 2026. This scheme allows quantum-safe bitcoin transactions without requiring any protocol changes, soft forks, or new opcodes. QSB operates within Bitcoin's existing legacy Script rules, addressing vulnerabilities posed by quantum computers, particularly Shor's algorithm. It utilizes RIPEMD-160 for pre-image resistance, providing a robust defense against quantum attacks. The implementation costs between $75 and $150 in GPU compute per transaction, ensuring security for P2PK outputs and legacy addresses.
Read at news.bitcoin.com
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