Yes, nosdav is cloud storage.  Optionally private and shared is definitely a design goal, but not yet implemented in a NAV.  NosDAV absolutely designed to do hash-addressable content.  But blossom got there first, so props & well done!  I LOVE what is being done with blossom today.

Before I worked on Nostr I helped create the Solid Project. Which is really an attempt to complete the WorldWideWeb project.  NosDAV is nostr identity combined with all the good parts of Solid, but without the complexity.  Hopefully will all converge.

https://solidproject.org/