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all they would have to do to prove it would be to bring some object from the future that would be testable as to the veracity of said object.
A newspaper or history book that gave information about specific events that were to take place in the near future.
and I had a book detailing next big stock market crash, which takes place in a week. Or...this coming monday. or ...a piece of paper and said ... "bet on the Colts, take the over, bet on the Saints and the under, take the knicks, Heat, Lakers, Pacers and then bet on the following 9 horses to win their respective races at churchill downs." Now, if I went 100% on my predictions, I'd say my information was fairly accurate and might lead you to believe I was coming from the future.
get me some physical evidence that will exist exactly like that in the future, with you having no way of manufactering it.
If someone from the future came to the now and said to bet on something, wouldnt the act of you betting on something that you wouldn't have done normally changed the rest of the future, so that the traveller might not have been able to visit you in the first place?
if I came to you with a history book that focused on the early part of the 21st century, all you would have to do was look for these events to happen. Sure, I could be psychic and I could have gone to the trouble of having a book printed up, bound, etc to look authentic but no psychic is 100% accurate and they are usually rather vague in their predictions, allowing themselves lots of leeway and room for adjustment to prove they were correct.
the text book, assuming there were events that could come to fruition in the near future would be pretty hard to disprove.