GeoProof is a GPS timestamp camera for Android. The user takes a photo and the app burns a stamp directly into the image pixels: street address, latitude/longitude, date and time with timezone, GPS accuracy (±metres) and altitude, an optional OpenStreetMap thumbnail, and a free-text reference number. Because the stamp is drawn into the pixels rather than stored as EXIF metadata, it survives being forwarded through messaging apps that strip metadata. The app is built around use-case presets that only change which fields appear and what the reference field is called: Delivery (Order / Tracking No), Cargo (Container / AWB), Property move-in / move-out (Unit / Contract No), Vehicle handover (Plate / Rental No), Site inspection (Job No), Visit / attendance (Visit ID), and General. Typical users are couriers documenting deliveries, people shipping or receiving freight, renters and expats documenting the condition of a property at move-in and move-out, car rental handovers, and field workers. Features: live camera with a real-time stamp preview, four stamp layouts, a local gallery of captured shots, download and share of individual photos, copy coordinates, and a printable PDF field report assembled from selected shots. Monetization: the app is FREE with a single one-time in-app purchase called "GeoProof PRO" (product id geoproof_pro, US$3.99, non-consumable, no subscription). PRO unlocks two extra stamp layouts (Map Card, Field Report), a company logo and watermark on the stamp, the PDF field report, unlimited gallery (free tier is capped at 20 shots), batch download, and project/team tags. Purchases are processed by Google Play Billing; we never see or handle card details. A "Restore purchase" button re-checks entitlement with Google Play. There are NO user accounts, NO login, NO registration. There is no advertising and no advertising SDK. Permissions used: CAMERA (to take the photo), ACCESS_FINE_LOCATION and ACCESS_COARSE_LOCATION (the coordinates, accuracy and altitude that make up the stamp), INTERNET (only for OpenStreetMap address lookup and map tiles, and for Google Play Billing).