Content verified. Source redacted.
Prove that a photo or document was created by someone in your trusted group — without revealing who. Built for newsrooms, NGOs, and investigative teams.
Security status: MVP — not yet audited
Veridact's cryptographic foundations (Semaphore V4, Groth16) are independently audited; the application layer (key management, proof format, smart contract) is not yet. Do not use Veridact in situations where your safety depends on it until an independent audit is complete.
Sign
Upload a photo and create a tamper-proof certificate that links it to your group — anonymously.
Verify
Check if a photo is authentic. Anyone can verify — no account needed.
Admin
Manage who is authorized to join the group. Admin only.
How It Works
An admin approves you
A group administrator adds you to the list of trusted contributors.
You set up your anonymous identity
The app creates a private key in your browser. You use it to join the group — after that, your personal account is no longer linked to your activity.
Sign your content
Upload a photo. The app creates a certificate proving it came from someone in your group — without revealing who.
Anyone can verify
Upload the photo and the certificate — the app instantly confirms if it's authentic. No account needed.