It is true there is no Twitter style verification on Mastodon. However, you can link to another website with which you have edit rights. If you create a mutual rel="me" link from Mastodon Preferences to that other website, you will get a green tick on your profile page, like this:
It doesn't prove anything about you other than you have access to a Mastodon account, and also have access to the other website, but that does have value.
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