In Japan, a Hanko is a personal seal, used in place of a signature to authenticate documents and transactions. Each mark is physical, unique, and irreplaceable.

Every Dutchtide original carries a Hanko seal, set into the work itself. Tap it with your phone: it shows the work is the real one, and that you are holding it.

That signature is your certificate of authenticity. Not a scan, not a receipt, the chip in the artwork itself, signing to the blockchain.