Chapter 5 - SIGTRACK: Forensic Audit Chain

SIGTRACK is the forensic backbone under the other dashboards. When a session crosses a high-risk threshold (DRM-RED, BHS collapse, acute alert patterns), its behavioral record is written to an immutable ledger: each record is SHA-256-chained to the previous one and anchored to a public drand randomness beacon (proof of time). Anyone can verify integrity without trusting PSA - PSA holds no signing key (zero-trust). It is what turns "we flagged this" into "here is the tamper-proof record, and here is how you check it yourself".