This document summarizes a presentation on Bitcoin and cryptocurrencies given by Juan Llanos in Dubai in 2014. The presentation covers what Bitcoin is, how it works, why it is revolutionary, its challenges, and its implications for financial crime. Regarding what Bitcoin is, it discusses different definitions that describe it as a peer-to-peer electronic cash system, a trust-free transaction ledger, and a digital payment network with a digital token (Bitcoin) and protocol. The presentation explains how Bitcoin works and some of its key features like being instantaneous, secure, low-cost, and global. It also covers why Bitcoin is revolutionary in having no central authority, using distributed consensus and transparent ledgers. The presentation addresses