Regarding profile verification, Mastadon suggests doing it by putting an anchor tag with a link to your profile on a website. In this article the author suggest

Regarding profile verification, Mastadon suggests doing it by putting an anchor tag with a link to your profile on a website. In this article the author suggests you can do it with a `<link>` tag instead. I prefer the link tag to an anchor tag so I'm going to try that right now...