Silk Road's URL has only changed once in its history, from "ianxz6zefk72ulzz.onion" to "silkroadvb5piz3r.onion". You may be thinking of Silk Road's backup URLs which will ONLY become active if the site is taken down permanently - you can read more about them in DPR's post here: http://dkn255hz262ypmii.onion/index.php?topic=32771 The forum backup URLs (with the 3 marketplace backup URLs at the bottom) can be found here: http://dkn255hz262ypmii.onion/index.php?topic=155554 Libertas