This Blockenheimer instance isn't available any more. I rehosted it as a quick fix to address certain moderation needs and whilst I didn't ask for or expect any feedback I have received a bunch of abuse and demands, as well as angry messages from people holding me responsible for its use and I can't be bothered any more.
Bluesky is also beyond saving at this point so I am also disinclined to provide anything to help with using it.
You can get a copy to host yourself here: https://codeberg.org/xormetric/bblock, you can even run it locally if you are prepared to ignore or resolve having a local https certificate.
Other instances/mirrors are also available, you can find them by searching on Bluesky.
Take care
Alex