Recorded by me at Tech Tuesday Meetup group 4 Oct. 2016
"Blockchain, cryptography, and consensus" By Christian Cachin (Cryptographer, IBM Research - Zurich)
Christian Cachin is a senior researcher at IBM Research Zurich. His research focuses on information security and distributed systems, with emphasis on secure protocols for distributed systems. Two of his current research topics are blockchain and consensus protocols in general. He received his PhD in cryptography from ETH Zurich in 1997.