http://ciisqbg45nggykdl6rjdrq3wc64csga4vkphu66qsi65mypeitqedoad.onion/blog/tlscryptv2
If you want to generate a new tls-crypt-v2 key, just repeat these steps. For those of you on Linux (who aren't afraid of the Terminal), you could technically automate all of this so that you get a new key each time you connect. To make things easier, the page at http://ciisqbg45nggykdl6rjdrq3wc64csga4vkphu66qsi65mypeitqedoad.onion/tlscryptv2 will show you just the key, without the HTML, if it sees your user agent as curl...