You might be interested in Peergos[0], where the server is treated as an adversary, and can't see file sizes, number of files etc. Everything is in merkle trees

You might be interested in Peergos[0], where the server is treated as an adversary, and can't see file sizes, number of files etc. Everything is in merkle trees whose roots are signed. So not possible for a mirror to selectively remove a file, or add an old version of a file. They don't even know what constitutes a file. [0] https://github.com/peergos/peergos https://github.com/peergos/peergos