BlockFact
Camera app that cryptographically seals photos at capture and registers proof on a blockchain
By Knightfox App Design Limited
What it does
BlockFact is an image provenance tool from Knightfox App Design Limited in Kingston. It defines its own image file format, .facti, which carries evidence that a photograph is authentic, unedited and timestamped rather than relying on metadata that can be rewritten.
Sealing happens at the moment of capture: the app produces a cryptographic commitment using zero knowledge proofs and registers it on the StarkNet blockchain, so a later viewer can check that the file matches what the camera recorded without the original having to be disclosed. The listing names journalists documenting events, photographers, legal professionals and content creators as the intended users.
The app is free and shipped in 2026. Knightfox also publishes a React Native SDK so other applications can produce and verify the format, which is why this is catalogued as a developer facing product as well as a camera app. Only an iOS release was found.
Built with
- iOS app
- version 1.6 · updated 10 May 2026 · first released 2026 · needs iOS 15.1
Detected automatically from public signals on 14 Sep 2026: response headers, page scripts, DNS records and public registries. It shows what is visible from outside, so it can miss things and can go out of date.
Ratings and comments
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Until then, the status above is the catalogue's own check. Spot something wrong? Tell us.
