>>158131
I picked I would print it as business cards 90x50mm because it is easier
I decided I would put a QR code for checking balance in a visible place, and hide QR encoded 25 word seed inside, I would generate it with python offline

The QR seed would need to be protected by a sticker that is glued so hard you would need to damage the note in order to get it so that no used notes get passed, and I would put some dark paper so that people dont trick it with a laser
I will pick some cool holo stickers to hide it beneath, the point is that any used notes must look like they were tampered with

Next is designing but that would not take much time and I can start getting them into circulation