AI is trained on creative work without permission. Cairn gives you a permanent, shareable timestamp that proves you made it first — before anyone else could claim it.
Drag a document, image, design, or piece of writing into the Cairn extension. Your file never leaves your device.
Cairn creates a cryptographic fingerprint of your file and writes it permanently to the Base blockchain with a timestamp.
Get a permanent link anyone can open — cairn.app/proof/... — that shows your verified ownership record. Forever.