ERRA · SIGNAL RAIL
Pattern → threshold ACT/HOLD → signed snapshot → signal verify without login. Twin depth to Velaru proof — inverse function, separate custody.
Erra grades asymmetry — ACT or HOLD before you commit.
Demo or API returns custody-walled JSON + verify URL — Ed25519 transport only.
Eight checks in browser — twin to Velaru /verify honest ladder.
Primary row = signal path. Secondary row = buyer rooms (Diligence · Reinsurance · Platform · Grades).
erra_public_demo