It's a bit geeky, but it works actually rather simple.
To become a real IPv6 friend, you need to do the following things:
-- Generate a GPG key with a comment named RIF following the URL of
- your computer
+- Generate a GPG key with a comment named **RIF** following the URL of
+ your computer (f.i. **RIF https://nico.ungleich.cloud**)
- Ensure that the URL points to the IPv6 address of your computer
- Setup a webserver on your computer
- Export your key and all real IPv6 friend keys to your webserver as