Someone asked me how you know how many sats you have, without a wallet. I told them you paste your pubkey into a service and it can look it up for you. 

They said, no how do you *really* look it up? You know, without trusting anyone. And I said ohhh, right. Well, you can look your own key up in the "database". This drive right here has a copy of that, the ...entire... global history of Bitcoin. Right here on this tiny drive. 

Damn.