Find the original when the metadata is gone
A fingerprint is a compact description of what a file looks or sounds like. We compute it from the file you publish and keep it on our servers, scoped to your account. Verification compares a copy against it.
Your signed original
Re-uploaded copy
- COPY
- Cropped, recompressed, no manifest
- FINGERPRINTS
- ISCC Image-Code · DINOv2-S descriptor
- RESULT
- Fingerprint match · record found
How fingerprints are kept
Server-side and private
Fingerprints are recovery signals. They are not returned by any public response and not shared between accounts.
One in the manifest
Only ISCC Image-Code enters a manifest, as the image soft binding. Every other fingerprint stays on our servers.
Recovery, not proof
A fingerprint match is reported as recovery, a lead to your original. Only an intact signed manifest establishes validity.
Fingerprints by media type
| Media | Default set | Also selectable |
|---|---|---|
| Image | ISCC Image-Code (always on), DINOv2-S descriptor | PDQ, DINOv2-S keyed LSH (256 bit) |
| Audio | Chromaprint | audfprint landmarks, ISCC Audio-Code |
| Video | TMK+PDQF | vPDQ |
Omit fingerprint_algorithms for the default set, or send a list to replace it. ISCC Image-Code is always added for images, and at least one fingerprint is required.
What each one is good at
In our own testing, which transformed a fixed corpus with re-encoding, resizing, cropping, overlays and rotation:
- ISCC Image-Code handles JPEG re-encoding, resizing, colour changes and added borders. It is weaker on crops, rotation and overlays.
- DINOv2-S handles crops and overlays, and held up best of the image descriptors we run.
- PDQ handles flips and 90-degree rotations and is widely used for hash sharing.
- Chromaprint handles codecs, noise and re-recording, but not pitch or tempo changes.
- TMK+PDQF matches re-encodes of a whole clip; vPDQ matches partial clips frame by frame.
Which requests fingerprint
| Request fields | Fingerprints |
|---|---|
"watermark": true, "fingerprint": true | Yes, with a watermark and a C2PA manifest |
"fingerprint": true | Yes, with a C2PA manifest and no watermark |
"watermark": false, "fingerprint": false | No |
"watermark": true | No |
Billing
One fingerprint unit per image, or per started second of audio or video. Units are graduated per month, from $0.015 down to $0.0025, and billed separately from signing and watermarking.
Make your signed files traceable
Add fingerprints with one request field and match stripped copies through the verification API.