Money is a lot of things. It can be a form of payment for goods and services. In essence we are looking at impressive graphics printed on combination of fibrous pulp derived papers and synthetic materials such as teslin. Another component of promissory notes is often hidden between layers these can be a simple hot/cold foil often partially demetallized to improve security. Nanotechnology enables manufactures to take hologram production to a whole new level.
What we see without aid of magnification are the overt security features. Guilloché is a decorative composition of repeated patterns of curves. When accurately designed it becomes a highly sophisticated product which adds security. Guilloché often can be represented as an algorithm. TBC