{
  "tool_id": "art-541-best-execution-recompute",
  "kernel_id": "art-541-best-execution-recompute",
  "display_name": "Best-Execution NBBO Recompute",
  "tool_version": "1.0.0",
  "mandate_type": "analytics_mandate",
  "purpose": "Recomputes, per supplied fill, price improvement in basis points against the NBBO at time of execution -- price_improvement_bps = (nbbo_ask - execution_price) / nbbo_ask * 10000 for buys, (execution_price - nbbo_bid) / nbbo_bid * 10000 for sells -- and whether each fill cleared at-or-better than the NBBO. Aggregates pct_at_or_better, avg_price_improvement_bps, and fill_count over a bounded fill set (capped at 5,000 fills). No customer/order identifiers accepted. Reg NMS best-execution obligations and FINRA Rule 5310 are the US crosswalk entry; the core recompute is the generic shape any best-execution regime ultimately checks. Attests the computation over caller-supplied inputs only, not an audit of those inputs or a determination of regulatory compliance.",
  "control_description": "Recomputes, per supplied fill, price improvement in basis points against the NBBO at time of execution -- price_improvement_bps = (nbbo_ask - execution_price) / nbbo_ask * 10000 for buys, (execution_price - nbbo_bid) / nbbo_bid * 10000 for sells -- and whether each fill cleared at-or-better than the NBBO. Aggregates pct_at_or_better, avg_price_improvement_bps, and fill_count over a bounded fill set (capped at 5,000 fills). No customer/order identifiers accepted. Reg NMS best-execution obligations and FINRA Rule 5310 are the US crosswalk entry; the core recompute is the generic shape any best-execution regime ultimately checks. Attests the computation over caller-supplied inputs only, not an audit of those inputs or a determination of regulatory compliance.",
  "declared_inputs": [],
  "declared_outputs": [],
  "kernel_digest": "sha256:3fe3f8f91aee95249b6c690837eac8476621b70688946d1417dda593e4c1915c",
  "trust_label": "independently verified: zkVM execution proof (risc0/groth16-bn254)",
  "data_vintage": "2026-08-04",
  "last_validated": "2026-08-04",
  "conformance_fixtures_vendored": true,
  "compute_proof_ready": "ready",
  "wave": 84,
  "source_url": "https://ainumbers.co/chaingraph/art-541-best-execution-recompute.html",
  "generated_at": "2026-08-15T11:12:17.704Z"
}