Explore the intersection of theoretical computer science and blockchain technology in this 50-minute lecture by Tim Roughgarden from Columbia University. Gain a clear and concise understanding of blockchains as a general-purpose public computer without an owner or operator. Learn how this technology supports user-owned data and verifies ownership while allowing anyone to run programs. Discover how a theorist's perspective can simplify complex technological concepts and provide valuable insights into the fundamental nature of blockchains and Web3.