[arkh]

> artsy frame

Embedding a QR code or simply a barcode somewhere and you're done. Maybe hide it like a watermark so it does not show to the naked eye and doing some Fourier transform in the app won't require a network connection nor lot of processing power.

[ndileas]

the article does mention that the client rejected a similar approach. steganography seems like a bad choice for a museum setting where you don't own the images.