The question is similar to saying -can you prove to another that you experience/d anything in your Soul?
Actually it
has been possible to prove to another.
See this case (technically an N.D.E. but an out-of-body experience at least:
https://www.youtube.com/watch?v=WPXK2Ls-xzQ
That is by now, a well-known case about one tiny detail that could be backed up by someone who went looking for the old shoe.
Now sceptics are likely to say "Oh the woman who "died" of cardiac arrest could have seen that shoe herself on that out of the way ledge high up on the building, and then subconsciously remembered it"...
But was a woman so close to death who literally flatlines with cardiac arrest fit enough to go wandering about the hospital, climbing stairs and leaning out of windows to check the ledges, before her NDE? Probably not.