I gave a talk introducing the blockchain at a meetup hosted by Willow Tree Apps:
Demystifying the Blockchain Hype, 25 October 2016.
Over the past few years, explosive growth in cryptocurrencies (especially Bitcoin), has led to tremendous excitement about blockchains as a powerful tool for just about everything. Without assuming anyprevious background in cryptography, I’ll explain the cryptographic and networking technologies that make blockchains possible, explain why people are so excited about blockchains, but why you shouldn’t believe everything you hear about them.
The slides are below (I believe a recording will also be available soon).