Cairn: Verified Photography
Proof your photos are real
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Cryptographic proof your photos are authentic. RFC 3161 timestamps, signed certificates and shareable verify pages — built for fine-art and documentary photographers.
Prove your photographs are real.
In a world where most images are generated, Cairn gives photographers a way to prove the opposite — that a picture was genuinely made, at a real moment, and hasn't changed since.
Built for fine-art and limited-edition print sellers, Cairn turns every print into a verifiable original.
HOW IT WORKS
- Capture or import a photo — its unique fingerprint is taken the instant the shutter fires.
- That fingerprint is sealed by two independent public timestamp authorities (RFC 3161) — no trust in Cairn required.
- Add a Certificate of Authenticity: title, your name, edition number, place.
- Export a print-ready PDF certificate with a QR code.
- Publish a beautiful public verify page your buyer scans straight from the print.
WHAT THE BUYER SEES
A scan opens a hosted, server-verified provenance page: the photograph, the edition, the exact moment it was anchored, and a green Verified seal — instantly, on any phone, no app or upload needed.
OPEN BY DESIGN
Cairn's manifest and verification protocol are open. Every receipt can be checked with standard tools — today or in fifty years. Your proof outlives the app, the device, and even Cairn.
PRICING
- Anchoring, certificates and PDF exports are always free and unlimited.
- Publish a public verify page for a one-time charge per certificate, or go Cairn Pro for unlimited publishing.
- Cairn Pro is a monthly or yearly subscription with a 7-day free trial. Payment is charged to your Apple ID; it renews unless cancelled at least 24 hours before the period ends, and you can manage or cancel it in Settings.
No accounts. No tracking. Your photos stay on your device until you choose to publish.
Made in Groningen by a photographer-developer.
Privacy Policy: https://cairn.steenbergen.ai/privacy.html
Terms of Use: https://cairn.steenbergen.ai/terms.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Cairn now has a fully Dutch App Store listing. Plus minor refinements and stability improvements.
The developer, Mario Steenbergen, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Mario Steenbergen
- Size
- 1.1 MB
- Category
- Photo & Video
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Cairn Pro Yearly $69.99
- Cairn Pro Monthly $8.99
- Publish a verify page $2.99
- Copyright
- © 2026 Mario Steenbergen