title: Authentic, legal, unalterable timestamp?
body: <p>Is there any way to impart upon a digital file, e.g., a LibreOffice document, an Emacs text file, a legally valid timestamp of when it was created? If not &quot;inside&quot; the actual file, then the next place would be within the file system/OS. Or could timestamps in, say, Git or Dropbox be considered unforgable? Or are we looking at blockchain finally for this? This is a sort of space-time issue for computers....</p>