报告题目：Direct Acyclic Graph-Based Distributed Ledger(基于有向无环图的分布式账本)
报告摘要：In this talk, Dr. Zhao will introduce IOTA, the first open-source distributed ledger that is being built to power the future of the Internet of Things with feeless microtransactions and data integrity for machines. Unlike traditional blockchain-based distributed ledger, IOTA does not consist of transactions grouped into blocks and stored in a sequential chain, instead, the IOTA ledger is formed as a stream of individual transactions entangled together as a direct acyclic graph, which is referred to as a Tangle. In order to participate in this network, a participant simply needs to perform a small amount of computational work that verifies two previous transactions. Rather than creating a hierarchy of roles and responsibilities in the network, every actor has the same incentives and rewards. In order to make a transaction in the Tangle, two previous transactions must be validated with the reward for doing so being the validation of your own transaction by some subsequent transaction. IOTA is not limited to transactional value settlements. It is possible to securely store information within Tangle transactions, or even spread larger amounts of information across multiple bundled or linked transactions.This structure also enables high scalability of transactions. The more activity in ‘the Tangle’, the faster transactions can be confirmed.
主讲人简介：Wenbing Zhao received his Ph.D. in Electrical and Computer Engineering at University of California, Santa Barbara, in 2002. Dr. Zhao has a Bachelor of Science degree in Physics in 1990, and a Master of Science degree in Physics in 1993, both at Peking University, Beijing, China. Dr. Zhao also received a Master of Science degree in Electrical and Computer Engineering in 1998 at University of California, Santa Barbara. Dr. Zhao joined Cleveland State University (CSU) faculty in 2004 and is currently a Professor in the Department of Electrical Engineering and Computer Science (EECS) at CSU. Dr. Zhao published over 200 peer-reviewed papers in the area of distributed systems (three of them won the best paper award), smart and connected health, computer vision, machine learning, physics, and education. Dr. Zhao’s research is supported in part by the US National Science Foundation, the US Department of Energy, the US Department of Transportation, Ohio State Bureau of Workers’ Compensation, Ohio Department of Higher Education, and by Cleveland State University. Dr. Zhao is currently serving on the organizing committee and the technical program committee for numerous international conferences. He is an Associate Editor for IEEE Access and for MDPI Computers. Dr. Zhao is a senior member of IEEE.