If you create a new twitter account (and make the first tweet(s) include your name and some quotes from the intro of https://books.google.com/books/about/The_Prophecies.html?id=neZvDwAAQBAJ&printsec=frontcover&source=kp_read_button ) and then put all your predictions, and only your predictions, in it—that would be an easy time stamped record.
If you create a new twitter account (and make the first tweet(s) include your name and some quotes from the intro of https://books.google.com/books/about/The_Prophecies.html?id=neZvDwAAQBAJ&printsec=frontcover&source=kp_read_button ) and then put all your predictions, and only your predictions, in it—that would be an easy time stamped record.