Not sure if it's what you mean by blank (not a big keyboard geek, but I just got a Moonlander), but when you buy it there's an option for all of the keys to have "-" on them, so it's effectively blank?
The printed keys are all the same shape and can be moved around as one remaps the keys. However, this results in a flat keyboard. You can get the same effect by buying another set of keycaps from a keycap company.
The blank keys are sculpted, so each key is unique to it's position or a set of positions. This makes reaching keys much easier from the default position, but makes learning the keyboard harder.
How do you like the Moonlander? I really love my ErgoDox, but the Moonlander looks nice.