Could blockchain technology prove that time travel is possible?

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This is a very easy question to answer. You'd only need to look for the mandela effect. Slight changes in the letters of the exchanges. Instead of Bittrex .. you may see Bitrex.

This would be due to tears and shifts in parallel universes. So it wouldn't be so much time travel happened with the tech. As much as it would be the overlapping of other universes and earths now using the tech. So as the both universes would be so similar you'd hardly notice any difference at all. So look for slight changes like that.