NUT-00
Notation, Utilization, and Terminology
MANDATORY
NUT-00: Protocol Foundation
This specification defines the core notation, cryptographic models, and terminology used throughout the Cashu protocol for privacy-preserving digital cash.
Meet the Characters
Alice
Wants to send money privately
Bob
The mint operator
Carol
Receives the payment
Key Innovation: Blind Signatures
The protocol uses Blind Diffie-Hellmann Key Exchange (BDHKE) to enable the mint to sign tokens without seeing their content. This ensures that when Carol redeems a token, Bob can verify its validity but cannot link it back to Alice.