Verify an A-Tag

Check whether a file was signed by a real person. Drop any A-Tagged file below to verify its authenticity.

Your file stays on your device

Drop a file here or click to browse

Any file tagged by the A-Tag app

How It Works

Drop Your File

Select any file that was signed with the A-Tag app. The file stays on your device.

Tag Extracted Locally

The A-Tag signature is read directly in your browser. Your file is never uploaded.

Server Verifies

The identifier is checked against the server and the Polygon blockchain. Credentials are anchored on-chain hourly.

What is A-Tag?

In a world of AI-generated content, A-Tag proves a file was created by a real person.

When you sign a file with the A-Tag app, your device verifies you're a real human using your unique biometric motion pattern, then embeds a cryptographic proof directly into the file. That proof is permanently anchored to the Polygon blockchain so it can never be forged or erased.

Anyone who receives that file can verify it here, no account needed, no app required, no trust necessary.