Time capsule crypto for a new baby

Got a friend who's gonna be having a baby soon, was thinking off putting together a time capsule of a few different newspapers from the day of the birth, then thought that it might be fun to throw a few bucks into some different cryptos and include them. Thinking literally just a few bucks into bitcoin, ripple, ethereum, and doge. What else would you include in a wallet to be opened in 18 years? Preferably things that will still exist in that time but one or two speculative ones couldn't hurt, who knows what might moon in the meantime.