reactor1967
Quantum Scribe
There is almost nothing. Almost everything can be explained away. Pictures and videos can be altered. well....perhaps an extinct species of something but even then someone will say oh it survived somehow. Bringing back something from the far future may be especially if it does not exist
yet or the tech is not possible yet. Even a hot smoking time machine will be doubted even if touched...perhaps the only way is an actual ride or to see someone appear or disappear in the machine. hmmm even then the person may assume he was somehow tricked. lol.
Then again it depends on who you are presenting these things to.
If it is an engineer who built the time machine or someone involved in the program bringing back anything will be proof because they know the machine works where if it is someone like you on the internet that does not know the time traveler personally there will be nothing to satisfy your desire for proof. It all depends on who is receiving the info or item. Proof to one person will not be proof to another.
"Proof to one person will not be proof to another." Well you hit the nail on the head pretty good there. More so with the subject of time travel which can be difficult to prove at best to one person and very difficult to prove to many people. Even if someone can pin point events there is always a hole or nick in the story someone will try to invent or find. And with media your right almost anything can try to be explained away. On devices from the future your correct about that. I recently watched videos on youtube of alian implants which is suppose to be way beyond our technology and even with scientific study all that could be proving was the material was not of earth but nothing else. With future technology yes it would be explained away somehow or put in a catagory other than time travel. Proving actual time travel is difficult at best. The only thing that might be proved was that it was in someway possible but that it actually took place almost impossible to prove. It might help to have the news paper and television reporters there but if they wrote negative storys then again the proof goes out the window. Even if a room full of scientist were present some would agree and some would disagree again clouding the issue. There would have to be some type of test developed and agreed upon by the scientific community which the results would be conclusive and agreed upon. The test more than likely would have to be able to be reproduced by others with the same conclusive results before it could actually be proved. But, how that would happen again would be difficult seeing as time travel creates paradox's and alternate timelines which again makes proof all most impossible.