Explore the concept of a secure data market built on blockchain technology in this 23-minute conference talk from USENIX Enigma 2019. Discover how combining blockchain with privacy-preserving techniques can revolutionize data sharing for analytics and machine learning. Learn about the challenges faced by today's data markets, the vision for a secure alternative, and the building blocks required to create such a system. Delve into topics like smart contracts, secure computation, program rewriting, and privacy risks in machine learning. Gain insights from a real-world deployment at Uber and understand the advantages of a secure data market that empowers users to share data while maintaining privacy, transparency, and control.