{
  "component": "FRI query-index derivation (sample_bits + folding-index walk)",
  "precompile": "0x0000000000000000000000000000000000000ae8",
  "scope": "port spec section 8; ONE constant-free slice of FRI component (d)",
  "validates": "index LOGIC vs public Plonky3 p3-fri spec, across independent implementations",
  "does_not_validate": "conformance to a real SP1 v6.1.0 trace ([MEASURE]; needs Poseidon2 challenger + exported proof)",
  "top_level_verifier": "unchanged, still fail-closed (returns EMPTY for every input)",
  "cross_language": [
    "java",
    "node",
    "python"
  ],
  "flags": [
    "[VERIFY] sample_bits masks LOW bits of as_canonical_u32 (LSB) vs p3-challenger",
    "[VERIFY] arity-2 fold: sibling = index^1, index_pair = index>>1 vs p3-fri verifier.rs",
    "[VERIFY] log_max_height = log_max_degree + log_blowup; num_fold_rounds = log_max_height - log_final_poly_len for the pinned config",
    "[MEASURE] bit-reversal index-to-domain-point mapping vs a real Plonky3 trace",
    "[MEASURE] end-to-end derive_query_indices vs a real SP1 v6.1.0 inner proof"
  ],
  "notes": [
    "Poseidon2 S-box exponent d = smallest d>1 with gcd(d, p-1)=1 = 7 (x^7)",
    "cross-language implementations compared: java, node, python"
  ],
  "passed": 100021,
  "failed": 0,
  "total": 100021
}