http://3l3yxzsdifyqn7rn765c7oy5rtv346tbw2zmtdfjvaotkmps2xwu4qyd.onion/Tor/Tor%20-%20Gentoo%20Wiki%20(5_28_2022%2010_18_09%20AM).html
Let's say a friend uses a website to invite you to do something. Then the website sends you an email with a link like this: website.domain/enGm7IKS. By opening the link, your tor connection has been identified to be yours, because the enGm7IKS part is unique for your email address.