Dev Ojha on the Osmosis Story and his Return to Privacy

Anna Rose welcomes listeners to the Zero Knowledge podcast, featuring Dev Ojha, co-founder of Osmosis and an expert in zero-knowledge research. They discuss the evolution of Osmosis within the Cosmos ecosystem, its impact, and the challenges faced during its launch, particularly regarding scalability, privacy, and Miner Extractable Value (MEV). After his work with Osmosis, Dave has returned to focus on Zcash and privacy technologies, highlighting a threshold decryption scheme aimed at blocking MEV by preventing validators from seeing user transactions before execution.

The conversation shifts to the collapse of Terra, which created an existential crisis for the Cosmos ecosystem. Dave recounts significant bugs during the crash that threatened Luna's security, leading to critical decisions by validators to halt the chain. The internal coordination during this crisis involved freezing UST and Luna liquidity pools to protect liquidity providers and conducting emergency audits to deploy upgrades rapidly. The aftermath of the Terra crash prompted a pivot in strategy to enhance security measures and cross-chain standards.

They discuss the challenges of user experience in DeFi, particularly the need for seamless trading across chains. Existing cross-chain wallets have limitations, leading to the introduction of Polaris, designed to integrate various bridges and DEXs while focusing on privacy. However, challenges arose before its launch due to dependency issues with Nomada and third-party bridges.

Dev Ojha discusses the potential for Cosmos to become a central hub for privacy applications, highlighting projects like Zcash, Secret Network, and Penumbra. He reflects on the migration of developers from Cosmos to Ethereum roll-ups or Solana, emphasizing the necessity for consolidation during a bear market. Ojha shares insights from his experience with Zcash, focusing on improving its scalability, usability, and post-quantum security.

The discussion touches on Zcash's usability challenges, including the lengthy "shielded sync" process. Ojha introduces the concept of Private Information Retrieval (PIR) to enhance usability by allowing efficient transaction information retrieval without compromising privacy. He outlines methods for verifying payments in a private system and proposes solutions for recovering funds from payments made via messaging apps.

Ojha emphasizes the need for a long-term solution to maintain usability as transaction volumes rise, discussing the balance between update frequency and server workload. He introduces the concept of oblivious transfer services to synchronize time across systems and explores the application of verifiable databases in Zcash using zero-knowledge proofs.

The conversation also addresses the complexities of establishing the first payment between users and introduces the relayer concept, "Raven," which facilitates payments while ensuring proof of communication. Ojha discusses the proposal to reduce block time to enhance user experience and introduces the concept of post-quantum recoverability for Zcash.

The discussion on zero-knowledge technology reveals differing opinions on its current state, with concerns about the complexity of multiple layers of abstraction. Zoe envisions a future where Zcash facilitates everyday private payments and emphasizes the importance of anonymity in user queries. The conversation concludes with a collective emphasis on the critical importance of privacy.