While I know there isn't any active development of purlz, should not a
move to say GitHub be appropriate for archival reasons?
I have made one Export to Github request to
https://github.com/stain/persistenturls/ (anyone can do this), but I am not going to be maintaining this, it is
merely a snapshot preserved for history.
If you want to help run purlz in one way or another, then create a
GitHub organization like persistenturls and add contributors.