You understand what? Graffiti is copyrightable. He can’t transfer it because that (in general) must be done in writing and with a signature. Any target of copy

You understand what? Graffiti is copyrightable. He can’t transfer it because that (in general) must be done in writing and with a signature. Any target of copyright litigation will demand to know who is purported to have assigned copyright, so just putting “Banksy” there won’t hold up. Those are the evidentiary issues.