When time traveling, I think it would be best to generate a random string seeded by actual universal entropy, a pseudo-random string generated by a good software-only-algorithm (like AES or something), download the entire contents of Wikipedia, and make two copies of each. Then, over the ocean or somewhere that would be unlikely to have ever had anything built there (in most timelines), travel 5 seconds into the future. If it works, compare random strings and Wikipedia hashes to tell if the universe is at all different, and if so how that affected human history.
It will probably be impossible to tell if that time-travel event will affect the future, but if any of the hashes are different, then the time traveler has also traveled to a parallel dimension that doesn't share a common past.
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