Project Tourbillon demonstrates cash-like anonymity for retail CBDC
The Bank for International Settlements (BIS) published an update on Project Tourbillon, which explores privacy, security and scalability for retail central bank digital currency (CBDC). The experiment proposes a concept of payer anonymity, providing cash-like anonymity to the payer, combining proven technologies such as blind signatures and mix networks with the latest research on cryptography and CBDC design suggested by David Chaum and Thomas Moser’s eCash 2.0 platform. Project Tourbillon explored not only current, but also quantum-safe blind signatures, an important cryptography used in both designs to guarantee privacy and future security. Tourbillon also demonstrated that implementing quantum-safe cryptography is possible, but it severely limits performance.