KASAM✦A PHONE-FIRST EXPERIMENTVerify a video

LIGHT AS A WITNESS

The video that
swears it's real.

A little light. A lasting oath.
Your screen writes a secret code into your video. An edit makes the oath break.

Seal a video Verify a video

On your phone. Offline. Nothing uploaded.

Use another screen? Try Light-only mode →
A phone projects a gold light pattern onto a face. The recorded brightness carries the same pattern.
01 / CAPTURE THE LIGHTKasam se.

THE IDEA, IN FOUR BEATS

Let the pixels
keep their promise.

A file can lose its metadata.
Light becomes part of the picture.

01

Your screen speaks.

A fresh seal code controls a small brightness flicker, 15 times a second.

02

Your face reflects.

The screen lights your face. Your camera records the pattern into the pixels.

03

The code travels.

Check the downloaded video, including a compressed copy. Real WhatsApp tests are still needed.

04

An edit breaks time.

The verifier looks for the pattern. A timing jump can reveal a cut or insertion.

TRY TO BREAK THE OATH

One second.
A different story.

Remove a second and watch the light code's timing jump. Try a clearly labelled synthetic test before recording your own video.

Run the demo

SEALED ●

ONE SECOND REMOVED ●

↑ Timing jumps. Kasam toot gayi.
A WORKING PROTOTYPE. AN HONEST PROMISE.

KASAM checks for a known light pattern and timing breaks. It does not prove that a statement is true, authenticate a person's identity, or detect every edit. Keep the seal code with people you trust.