When you’re in the U.S., all real bills can have a watermark of the person whose portrait is around the bill. They’ll even have a stability thread embedded inside the paper that glows under ultraviolet light. Some trade dollar fakes have an used rim- they struck the coin 'disc' initial https://rafaelyzzyy.blogoxo.com/35734886/a-secret-weapon-for-where-can-i-copyright-dollar-bills