Sounds a lot like 'the ontological proof of god' when you get down to real er *proof*.

Even a notarized letter sent registered, content confirmed by phone call later (?) - always is the element of 'the final trusted arbiter': Heinlein's fairwitness ?

So if the data being shipped is That sensitive (or in Murican scale of importance in the universe: $-related) - well.. I dunno enough about the many entries that are almost good-enough.

Luck,

Ashton Turing