Slashdot Reader Builds a Photo-Verification App for iPhones
Long-time Slashdot reader BrianFagioli is announcing that he's released a new iPhone app that creates a cryptographic witness for photos without uploading the original image.
The app hashes the file, signs the hash using a dedicated identity stored in Apple Keychain, and publishes the witness to Nostr relays while keeping the photo inside the app unless the user chooses to export it.
Rather than trying to determine whether a scene was genuine, the app — named Veridenz — answers a narrower question, by verifying whether a photo file matches the one that was originally witnessed.
Users do not need a Nostr account because the app creates its own signing identity, keeping private documentation separate from a public Nostr profile.
"The developer does not collect any data from this app," says its page in Apple's iPhone store. The app's tagline is "Capture. Prove. Verify."
The app hashes the file, signs the hash using a dedicated identity stored in Apple Keychain, and publishes the witness to Nostr relays while keeping the photo inside the app unless the user chooses to export it.
Rather than trying to determine whether a scene was genuine, the app — named Veridenz — answers a narrower question, by verifying whether a photo file matches the one that was originally witnessed.
Users do not need a Nostr account because the app creates its own signing identity, keeping private documentation separate from a public Nostr profile.
"The developer does not collect any data from this app," says its page in Apple's iPhone store. The app's tagline is "Capture. Prove. Verify."
Read more of this story at Slashdot.
FIP XML/RSS/RDF Newsfeed Syndication https://freeinternetpress.com/rss.php
© 2026 FreeInternetPress.com
Free Internet Press is licensed under a Creative Commons Attribution 3.0 United States License. You may reuse or distribute original works on this site, with attribution per the above license. Any mirrored or quoted materials may be copyright their respective authors, publications, or outlets, as shown on their publication, indicated by the link in the news story. Such works are used under the fair use doctrine of United States copyright law. Should any materials be found overused or objectionable to the copyright holder, notification should be sent to [email protected], and the work will be removed and replaced with such notification.
Please email [email protected] with any questions.