Explore the concept of centrally banked cryptocurrencies in this 33-minute lecture by Dr. Sarah Meiklejohn from UCL. Delve into the world of digital currencies, starting with an introduction to fully decentralized cryptocurrencies and the issues surrounding Bitcoin. Examine the structure of higher-level and lower-level blocks in blockchain technology, and understand the crucial consensus features that govern these systems. Analyze the security properties of centrally banked cryptocurrencies and learn about the role of mintette logs in maintaining the integrity of the network. Gain insights from Dr. Meiklejohn's extensive background in computer science, security, and cryptography as she presents this complex topic at the Alan Turing Institute.