Payment Systems
An insider's look at the fascinating technical and organizational details of ATMs — from the 40-banknote limit and 30-second timeout rules to supervisor cards, cryptographic keys, and a mouse that died a hero's death surrounded by cash.
Payment Systems
A deep dive into the technical systems used to verify the authenticity of banknotes, covering human-readable security features, machine-readable markers, detection devices from simple UV lamps to advanced sorting machines, validation algorithms, and future technologies including RFID tags and quantum money.