@martin It simply verifies that I am the owner of both the account and the website; so if you know that the website is mine it is a way to verify that I am the one tooting. The way to do it is simply add a `rel="me"` tag in the link on your website. If you go "Edit profile" in Mastodon there is a bit more detail on it
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!