Sorry for necromancing this thread. @MJ that's just link to API docs. I can't seem to find a way to get new developer key - so basically, API does not exist (at least not for new developers).
@volanar you can see posts’ edit history and restore different edits as admin. You can even see who edited it. What’s in the plugin you are talking about is already in core, most likely why it’s outdated or something.
