Open, decentralized media attestation

Is this original? Check it onchain.

Stamper records a photo or video the moment it is taken. Anyone can check it against the blockchain.

Powered byFilecoinOnchain Cloud · PDP proofs
Try an example
Harbour at duskDemo stamp
or

Check a copy

Drop a photo or video here, or choose a file. It is hashed in this browser first.

Scan a QR code

How a stamp works

Three steps, each one public and repeatable.

  1. 01 · Capture

    Signed on the device

    The Stamper app, on a phone or in the browser, hashes the photo or video as it is taken and signs a claim with the device's key.

  2. 02 · Anchor

    Recorded on Filecoin

    The claim is registered on the Filecoin EVM, and two independent storage providers keep the original and prove it every day.

  3. 03 · Check

    Open to anyone

    Anyone with the code can rerun every check on this site, or with nothing but cast and curl.

Who it's for

Journalists and newsrooms, human-rights documenters, citizen reporters, creators and public figures: anyone who must later show when a picture was taken and that it was not altered.