Mastodon has a verification mechanism, though it looks different from Twitter's. We do not ask for your documents. Instead, if you have a website that you are known by, you can verify that you are the owner of that website.

Link to your Mastodon profile from the website, either through a visible link, or through a <link> tag in the head of the document, with a rel=me attribute, and link back to that page from your Mastodon profile. It should then get a green checkmark, like @Mastodon.

@Gargron @Mastodon ya I’m also wondering if we can do this from our other socials
@malcolm @Gargron @Mastodon the only one I’m aware of is if you set your Mastodon profile as your URL on GitHub, it adds a `rel="me"`, so it works to verify!
@malcolm @Gargron @Mastodon unfortunately they also override `rel` attribute in links in READMEs so you can't use their magic username/username repo to add a link, it only works on the single profile-wide URL.