Something that you really want and is worth $1 but you can’t buy for less than $20 is something you’ll never buy for yourself. That’s often a pretty good gift.

Imagine a big stamp. Anything stamped with it, the internet in general trusts. Because we all trust that nobody knows how to stamp things like that big stamp. Except instead of a literal stamp, it’s a secret combination of numbers and letters that works like a password. It now turns out that this secret combination of numbers and letters was just the number 4.