No signup. No install. Three scripted moments: an ordinary reply, an adversarial prompt getting neutralized, and every event anchored into an append-only HMAC-sealed ledger. This is the Sentinel doing its actual job — not a video, not a mock.
You're about to watch the Sentinel handle two prompts back-to-back: one harmless, one hostile. The harmless one returns a signed receipt. The hostile one gets neutralized in flight. Both are chained into the truth ledger with the same HMAC pipeline.