Bolt's related site - the one they were in the process of setting up - that page can still be seen.
http://bit.bolt.cd/But it says
"Registration is currently disabled for new users. Bolt forum users belonging to the following usergroups (Administrators, Super Moderators, Moderators and Elders) may convert their existing forum accounts (this will not affect your forum account or profile in any way)." which keeps just about everyone from accessing it.
Not that it matters because it looks like might also be out of commission because the one blog I saw has an Invalid date.