Hello @firepower how are you, this question I liked so much that I decided to make a post about it, I'll leave you the answer on steem.chat
regards.
https://steemit.com/contest/@hendersonp/if-you-were-sent-back-in-time-about-500-years-without-any-object-from-this-century-including-clothes-how-would-you-prove-you-are