The goal is to discuss security and integrity issues with the participants. Data protection is an important facet of IT systems, and therefore has to be aligned with blockchain technology. Participants will learn about pseudonymity in public blockchain systems. Furthermore, this module will provide deeper knowledge in cryptography, mining and consensus algorithms. These topics are primarily relevant in public blockchain architectures; however, cryptography is also a key element in the enterprise context. Additionally, students will learn about the scalability of blockchain solutions and game theoretical approaches.