Freenet might be an option. There's a built-in option for versioning so
   changes or additions/extension to the original upload can be searched
   while still remaining in control of the original uploader. As for being
   immutable just program a client to query the content on a regular basis
   and it should stay cached.

   On Mon, May 21, 2018 at 6:36 PM, Zenaan Harkness <[1]zen@freedbms.net>
   wrote:

     On Mon, May 21, 2018 at 09:28:44PM -0400, Karl wrote:
     > Hi cpunks,
     >
     > I'm trying to figure out how to produce lengthy recordings that
     cannot be
     > reasonably removed or altered even by a very powerful entity.
     Your sole option is distribution of the recording (presumably in
     real
     time) to multiple jurisdictions, at least one of which will be
     supportive of "not deleting/ suppressing" your recording.
     I imagine Wikileaks would like to know if you come up with something
     better than the Tor NSA CIA mafia.

References

   1. mailto:zen@freedbms.net