Native bridgesCalibrated · 2026-04-22

Full pipeline to reproduce the native bridge state classification (BS1 / BS2) served by Invarians for Arbitrum, Base and Optimism. Calibrated using a P97 over 30 days of collector signals with deterministic, published guard rails.

Source

Capture

Live RPC reads on each L2, persisted to Supabase table ans_bridge_signals.

Signal per sample

last_batch_age_seconds, elapsed time since the last L1 commitment of an L2 batch.

Sampling cadence

600 s polling by the Rust collector.

Calibration window

30 days rolling, P97 per chain.

Files

Reproduction paths

Path A · Live collector

1. Clone the collector sources at github.com/agentnorthstar/calibration.
2. Apply migration_bridge_thresholds.sql to a Postgres instance.
3. Run the collector for at least 25 days against Arbitrum, Base and Optimism RPC.
4. Execute calibrate_native_p97_30d.sql as a transaction.
5. Read the AFTER audit, confront to expected_thresholds.md.

Path B · SQL replay on exported samples

1. Load the CSV into a Postgres ans_bridge_signals table with the declared schema.
2. Execute calibrate_native_p97_30d.sql.
3. Read the AFTER audit, confront to expected_thresholds.md.

Guard rails

• p97_s IS NULL — chain has no usable samples.
• n_samples < 1000 — not enough support for a stable P97.
• days_span < 25 — not enough time coverage inside the 30 day window.