Explore a groundbreaking approach to transparent and privacy-preserving data services in this conference talk from USENIX Security '23. Delve into the innovative TAP system, which addresses the limitations of existing authenticated data structures by introducing a novel tree structure that supports efficient result verification while maintaining user data privacy. Learn how TAP utilizes independent audits with zero-knowledge range proofs to ensure correct tree construction without compromising sensitive information. Discover the system's capability to support a wide range of verifiable operations, including quantiles and sample standard deviations, while achieving practical performance at scale. Compare TAP's effectiveness against state-of-the-art baselines like IntegriDB and Merkle2, and gain insights into the future of secure, transparent, and privacy-preserving multi-user data services.