Just get some world leaders to sign something saying that any time travellers must report to that point in time
But obviously it will never exist
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time travel can only be forwards
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But what if the future leaders come together once they invent time travel and decide never to go back? Y'know, for reasons of keeping the space-time continuum/SCIENCE!...or trolling purposes.
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The best thing would be to [spoiler]#sexylonghorn[/spoiler]
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Thought experiment! You've just discovered [i]time travel.[/i] Congratulations, OP! Now, what do you do first? Do you: A. go back in time and tell some stuffy world leaders that time travel is real or: B. go back to the Jurassic and ride a Tyrannosaurus Rex! I think I've made my point.