David Chaum is a pioneering cryptographer and widely regarded as the “father of digital cash.” He invented eCash and developed foundational technologies such as blind signatures, mix networks, and zero‑knowledge proofs, which underpin modern cryptocurrencies and privacy systems. Chaum founded DigiCash in the 1990s and today leads the xx network, the first blockchain designed with quantum‑resistant cryptography and privacy at its core. A PhD graduate from UC Berkeley, he has advised governments, think tanks, and ventures worldwide. His visionary work continues to shape secure digital infrastructure, decentralized governance, and the future of privacy‑preserving financial innovation.