Most of the documentation is a snapshot of the old Namesys site (archive.org, 2007-09-29).
There was also a Reiser4 Wiki (archive.org, 2007-07-06) once on pub.namesys.com.
Reiser4 development appears to have stalled and ReiserFS is deprecated and scheduled to be removed from mainline Linux in 2025.
Block log
From Reiser4 FS Wiki
This is a log of user blocking and unblocking actions. Automatically blocked IP addresses are not listed. See the block list for the list of currently operational bans and blocks.
No matching items in log.