I am a time traveler from rhe future here to beg you to stop what you are doing

  I have no way of proving to you I'm really who I claim to be

  Well, you could have printed the blockchain hashes of today and tomorrow...

Interesting. Brings to mind a question: How would time traveler scientifically prove that they are the true thing? I need something that I can verify immediately, i.e. not wait for the future.

Showing some (to me) currently unknown technology wouldn't work because "The future is already here – it's just not evenly distributed", i.e. he might just be working for a secret corporate or government lab today.

Disclosure: I am long bitcoin and have no plans to initiate any positions within the next 48 hours.

Quite realistic scenario ...