First, start the verification process on App.net.
Second, in whatever custom aside you put your ADN timeline in, find the link to your ADN profile (it should be something like “Follow @yourname”). Add ‘rel=“me”’ to the anchor tag.
Explaining further, change this line:
Then, of course, finish the verification process on the ADN website.
And that’s it. Adding a configuration option to the plugin for verification would be easy enough, but since a new Octopress is theoretically coming out very soon, an easy solution like this is probably sufficient. I would imagine that whatever ADN timeline plugin that comes with the new Octopress will have the verification stuff built in.