LiveGuard

What we built LiveGuard checks, during a live video call, whether the person on screen is a real human, before a finance approver releases a payment. It runs as a small floating dot over Meet or Zoom. The caller is never asked to do anything. The agent watches, decides, stays quiet on a pass, and leaves a red banner up on a fail. How it works Watch. The browser records the caller's video tile, from a screen share of the call or a webcam, in back-to-back 8-second windows. Measure, with YOLO. YOLO pose finds the caller (the largest person in the window, ignoring your own self-view) and checks four things: 1.Is there one clear face? 2.Are there no sudden jumps between frames (cuts or glitches)? 3.Does the head show natural micro-movement? A held-up photo moves as one rigid piece. 4.Are the frames changing at all, or is the feed frozen? It also marks the hard moments, a head turn or a hand near the face, because that's where face-swap deepfakes break. Judge, with Cosmos. NVIDIA Cosmos sees five frames, hard moments first, each labelled with what YOLO measured. It judges whether the person looks physically real, and names any artefact with its frame number.Decide each window. 1.FAIL if Cosmos found an artefact or the feed is frozen. 2.INCONCLUSIVE if there was no clear face or no natural movement. 3.Otherwise PASS: "strong" if a hard moment was judged clean, "basic" if the caller stayed still.