This document provides an overview of a class on cryptocurrency and bitcoin. It discusses what makes a good currency, the history of currencies like salt and fiat currency, and challenges with decentralized digital currencies. It introduces bitcoin's approach of using a public ledger recorded through mining to record all transactions in a decentralized way without requiring trust in a central authority. The class will cover cryptography, computer science, economics and other topics through studying bitcoin as a concrete system. Students are assigned to set up a bitcoin wallet and complete readings before the next class.