In episode 15, we're featuring two more talks from MobileCoin's Crypto Renaissance Conference. Up first is Alexander Rose, the executive director of The Long Now Foundation, an organization devoted to long-term thinking that is best known for building the ten-thousand-year clock. Alexander explains the roots of cryptography and how ledger systems have evolved over the last 5,000 years. Then we feature a talk from isis agora lovecruft, cryptographer and research consultant at MobileCoin. isis agora lovecruft joins to speak about Ristretto, the cryptographic technology that MobileCoin uses to preserve the privacy of its users.