Huh? I’m a bit confused by what you mean with this. I mean I even run my own single user Mastodon instance for myself, and I certainly have never needed to “verify” my account.
You can put links on your profile that get a “verified” checkmark next to it if you put in a special meta HTML tag anywhere on it, but that’s more of an “I control / own this page” thing, and doesn’t actually really mean much to people as far as I’ve seen - is that what you mean?