Bitcoin quantum-resistant transactions cut 79% in cost to under $67
In brief
- Optimization challenge reduced GPU costs for quantum-resistant Bitcoin transactions by 79%
- New cost under $67, down from $320 in August
- StarkWare, Yukon Research, and Eigen Labs launched challenge September 16
- 62 accepted improvements across two computational tasks enabled the reduction
- Approach remains interim; soft fork favored for long-term quantum security
The optimization breakthrough
The challenge produced 62 accepted improvements across two computational tasks needed to prepare a quantum-safe Bitcoin transaction. The cost reduction makes the approach more practical for holders facing quantum threats, though the latest optimizations have only been demonstrated in benchmark tests, not yet in real-world conditions.
The first quantum-safe Bitcoin transaction was mined and confirmed on August 26 with approximately 3,100 GPU-hours across roughly 100 GPUs, costing about $320. That benchmark provided the baseline for measuring the challenge's impact.
Why quantum protection matters
A sufficiently powerful quantum computer could break the elliptic-curve digital signatures used by Bitcoin, potentially allowing attackers to steal coins whose public keys are exposed. StarkWare researcher Avihu Levy published the Quantum-Safe Bitcoin design in April as a method to add hash-based protection against quantum attacks without changing Bitcoin's consensus rules.
Levy described it as a "last resort measure" due to costs, complexity and limited applicability. The approach isn't meant to replace broader protocol changes.
The path forward
A construction that costs a few hundred dollars per transaction is a demo. One that costs $67 is closer to something a holder with a large unexposed balance might reach for in an emergency.
StarkWare still favors a soft fork as a better long-term answer for broad quantum protection on Bitcoin. The optimization challenge shows that the immediate, emergency-use case is becoming more accessible, but the real solution will likely require consensus-level changes to the network itself.
The reduction from $320 to under $67 demonstrates progress in making quantum-resistant options practical for holders with significant unexposed balances. It's a meaningful step, even if it remains a contingency rather than a primary defense strategy.
