Hash ladder, log-time: L1 entry_hash (on-device, offline-capable)
→ mesh replicas (gossip, still no internet) → L2 witness leaf — FIRST INTERNET
→ L3 git SHA → L4 Rekor. The red band is the Danger Zone (solid to median, hatched to p95).
Survival curve — share of captures still inside the Danger Zone after t.