Evidence protocol

ProofQR

Cryptographically signed QR codes that prove time and place — hold the screen in frame while you shoot photos or video.

  • Live rotation

    Tokens refresh every ~1.5s and expire in ~3s to prevent static paste attacks.

  • Signed evidence

    Server- or device-signed envelopes verifiable without trusting the image alone.

  • Location claims

    GPS coordinates embedded when the browser grants permission — always treated as claims.

▣ Start live proof ✓ Verify a token

Works in Safari on iPhone, iPad, Mac, and Apple Watch. Compatible with the native iOS app’s offline PQR2 format.