STARK verification takes 25 microseconds per proof. That sounds fast until you are verifying 100,000 proofs per second. We got it to 85 nanoseconds. 294x. Here is how. The Problem STARK verification is O(log^2(n)). The four steps: FRI layer checks — 9.2us Constraint evaluation — 7.8us Merkle path verification — 5.1us OOD consistency check — 2.9us Total: 25 microseconds. Repeated on every request. The Fix Verify once. Cache the result with a computation fingerprint: SHA3-256(proof_bytes || verification_key || constraints || domain_params) Enter fullscreen mode Exit fullscreen mode The cached result is served in 85 nanoseconds. Not faster math. No math at all. Results Metric Before After Latency 25us 85ns Speedup — 294x 100K/sec CPU 2.5s 8.5ms Every cached result is signed by three post-quantum families (ML-DSA-65, FALCON-512, SLH-DSA) and independently verifiable.…