As a designer, I can copy sketches or make high resolution versions of any logo and claim them as my own pretty easily. That would not work as proof that I'm th

As a designer, I can copy sketches or make high resolution versions of any logo and claim them as my own pretty easily. That would not work as proof that I'm the creator. I believe metadata on the files can help. -I'm no lawyer though- or emailing a copy of the logo to yourself like you said.