1. Establish an official website which people know is yours
2. Add a link to your official website from your Mastodon profile
3. Edit your Mastodon profile and go to the section on links, paste the HTML ownership code into the front page of your website
4. Save your Mastodon profile, your instance will check that the ownership code is present on your website. If it is, you get a green tick next to the link.
5. Congratulations, you're verified!