A different approach to file history

Git handles 4 different types of objects
Files (called «blobs»)
Directories (called «trees»)
Commits («commits»)
Tags («tags»)

All objects are immutable
Each object is identified by its own hash
Git stores objects in a directory «objects», according to their hashes
An object may include hashes that link other objects

The status and complete history of a file-set is identified by the
         final commit in such history
Every commit is represented by its SHA1 hash
If two users own the same commit they automatically own the same files
To authenticate a file-set and history you just sign the hash