Proof of Loss
Proof of Loss turns one walkthrough video of a home into a verified, priced inventory.
Core trick
Renders the reconstructed home from the video's camera positions and fixes scene items until each render matches its real frame.
Description
Proof of Loss turns one walkthrough video of a home into a verified, priced inventory. When something is lost, it works out on its own what's missing and files the insurance claim for you.
After a burglary, fire or flood, insurers ask for a list of everything you owned, with values. Most people have never made a home inventory, so they rebuild it from memory, and every forgotten item is money lost.
You film your space once. Gemini 4 Argon rebuilds it as an explorable 3D inventory, then checks its own work, rendering the scene from the video's camera positions and fixing what doesn't match the real frames. Managed Agents price every item at real retailers, with listings as proof.
After a loss, you film the space again. Argon finds the missing items itself and tells them apart from ones that were only moved. A claim agent fills the insurer's form from a locked-down sandbox, and you review and submit it.
README excerpt
# Proof of Loss After a fire, flood or burglary, your insurer asks you to list everything you owned, from memory, with a value for each item. That list is the "proof of loss". People forget most of what they had, and every forgotten item is money they don't get back. Proof of Loss turns one walkthrough video of your home into a **verified** 3D inventory with a price on every item. "Verified" is the point. A single pass that invents an item inflates the claim; one that misses an item underpays it. So Gemini 4 Argon renders its reconstruction back from the camera positions in the video, compares each render with the real frame, and fixes the scene until they agree. Then Managed Agents sandboxes browse real retailers to price every item at "like kind and quality", the standard insurers reimburse at. After a burglary, you walk the same space again. Argon compares the "after" video with the inventory, tells moved items from stolen ones, and only calls an item stolen when its BEFORE | AFTER image proves it. A claim agent in a Managed Agents sandbox then fills the insurer's claim form from the stolen list and stops for you to review and submit. Every step any agent takes appears live in the Activity panel. Built at the **Gemini 4 Argon Hackathon** (Cerebral Valley × Google DeepMind, San Francisco, October 25 2026) for **Problem Statement 2: More Dimensions** and **Best Use of Managed Agents**. ## Results on our demo walkthrough A 2-minute walkthrough of a building lobby, score