Verify a sealed report

Check that photos are the untouched originals from a ScratchProof scan or a DepositBack check-in or move-out. Everything happens in this browser: your photos are never uploaded.

1. Paste the fingerprints from the report

Copy the photo fingerprints (64-character SHA-256 codes) from the appendix of the PDF report and paste them here. Any text around them is ignored.

2. Add the original photos

Use the original photos shared with the report (ScratchProof: "Share PDF + original photos"; DepositBack: the ZIP export). Edited, resized or re-saved copies will not match.

Choose photos or drop them here

How the seal works

When a photo is taken, the app computes its SHA-256 fingerprint. Changing even one pixel changes the fingerprint completely.
When a scan is finished, the photos' places, times, fingerprints and damage marks (in DepositBack also notes, meter readings and keys) are written in a fixed order (format rentproof-seal-v1 or depositback-seal-v1) and fingerprinted again. That result is the scan's seal, printed on the report.
This page recomputes a photo's fingerprint and looks for it in the report. A match means the photo is the same file that was sealed.

Times and places come from the phone that took the photos. The seal shows that nothing changed after sealing; it is not a certified time-stamping service.