Not a bad idea! Think of this in the form of a birthday card (Christmas, etc.). The card would state something like being an old fart and don't know a damn thing about computers, but along with this fiat bill is a link to get a bitcoin, whatever the fuck that is, but they, however the fuck they are say, that in time, one bitcoin could be worth a hell of lot more. Therefore, _______________, you figure out how to unlock it, and may I suggest storing it in a safe place, whereupon it may pay for your college education. Or spend it now on some stupid video game, like I know you will. Either way, I love you, and happy birthday ______________________.
Grandma & Grandpa