StarkWare Cuts Bitcoin Quantum-Safe Transaction Cost by 79%

StarkWare says optimization efforts connected to its Quantum-Safe Bitcoin (QSB) work have driven down the estimated computational cost of constructing a quantum-resistant Bitcoin transaction to under $67—down from about $320 for the first QSB transaction demonstrated on mainnet in August. The latest figure, published in a Sept. 23 update and reflected on the Yukon QSB dashboard, suggests the benchmark cost has continued to edge lower to roughly $66.

While the QSB approach is designed to improve resilience against future quantum threats without requiring changes to Bitcoin’s consensus rules, StarkWare cautions that the new numbers are based on benchmark tests. The development nonetheless matters for anyone evaluating practical “emergency” defenses for large holders who may be most exposed if public keys are later compromised by quantum-capable machines.

Key takeaways

• StarkWare reports QSB transaction construction costs fell to about $66–$67 after a week of optimization.
• The cost decline follows the Quantum-Safe Bitcoin Optimization Challenge, which generated improvements across the benchmarked transaction-building steps.
• The earliest mainnet QSB demonstration required ~3,100 GPU-hours and cost around $320 in compute, excluding Bitcoin network fees.
• QSB is positioned as an “emergency” measure; StarkWare says broader, long-term protection likely still requires a consensus-layer soft fork.
• StarkWare emphasizes the latest optimizations are verified via benchmarks, not renewed full mainnet demonstrations.