Register here to attend in person. Co-sponsored by the Department of Computer Science and the Department of Electrical and Computer Engineering The Arbitrum blockchain protocol started as a Princeton University research project, and has grown into a robust community hosting hundred of applications and over 600,000 monthly users. Along the way, the system has evolved through at least three generations to meet the needs of developers and users. This talk will provide a technical description of how Arbitrum works, as an example of a modern blockchain protocol, along with a perspective on the history and future of blockchain technology. Bio: Ed Felten is the co-founder and chief scientist at Offchain Labs, Inc. He is the Robert E. Kahn Professor Emeritus of Computer Science and Public Affairs and the Founding Director of the Center for Information Technology Policy. Felten officially retired from Princeton University and transferred to emeritus status on July 1, 2021 after 28 years on the faculty of computer science and the Princeton School of Public and International Affairs (SPIA). He founded CITP and led it for 13 years (apart from two federal government posts) before handing off his leadership role. To request accommodations for a disability please contact Jean Butcher, butcher@princeton.edu, at least one week prior to the event. This seminar will be livestreamed, recorded and posted to the CITP website, CITP YouTube channel and Princeton University’s Media Central channel. The livestream will be available here: https://mediacentrallive.princeton.edu/