Abstract: The blockchain industry is the latest addition to the list of fields penetration testers should understand and be able to audit. In this presentation, my aim is to help everyone get a basic understanding of what a blockchain is, how as penetration testers we can mentally map this field, What is Ethereum and why it's important to developers, How [D]apps are built on Ethereum, What common pitfalls to look for at a high level and a case study of a recent exploit. Bio: Security Consultant at Nettitude and Bug hunter