No whistling blowing here...

Forty years ago in South Africa, a note (money) carried the following promise:
I promise to pay in Pretoria in Gold (Signed Governor of the Reserve Bank).

It changed later to: I promise to pay in Pretoria(Signed Governor of the Reserve Bank). Note it does not say "what".

Now? No promise, just a signature.

To-morrow? No more money, just a figure in a computer...

Easier to control and manipulate!

And people will just dance to the whistle...