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.

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If you see the Twitter verified icon on Mastodon, its a custom emoji on that person's Mastodon instance. I've only seen this on toxic instances such as freeatlantis​.com

emojos.in/FreeAtlantis.com?sho

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Mastodon @ SDF

"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko