This issue of Library Technology Reports (vol. 55, no. 8), "Blockchain in Libraries," examines the application of blockchain in libraries. Blockchain technology has the ability to transform how libraries provide services and organize information. To date, most of these applications are still in the conceptual stage. However, sooner or later, development and implementation will follow. This report is intended to provide a primer on the technology and some thought starters. In chapter 2, the concept of blockchain is explained. Chapter 3 provides eight thought and conversation starters that look at how blockchain could be applied in libraries. Chapter 4 looks at the barriers and challenges of implementing blockchain in libraries. Chapter 5 raises some questions around ethical issues that librarians should consider with respect to blockchain implementation.