Well, you can absolutely own the copyright to a digital piece of art. Granted, you don’t get a neat little cryptographic signature, but according to the law, yo

Well, you can absolutely own the copyright to a digital piece of art. Granted, you don’t get a neat little cryptographic signature, but according to the law, you control who can display that piece of art, and where they can display it. Now then, whether copyright should grant such rights, that’s a different discussion.