Book excerpt: This easy-to-use guide covers the history, development, and current workings of cybercurrencies and the underground economy, both in the United States and around the world. The world of cybercurrency has experienced explosive growth in recent years, but that expansion has been accompanied by numerous controversies and misunderstandings about what it is, how it works, and how it relates to the underground economy and illegal activities such as money laundering, tax evasion, and human trafficking. Many illegal or malicious activities are paid for with cyber currencies. This book covers those applications. But cyber currencies also have many legitimate, constructive applications, all of which are explained in Rogue Money in clear, plain English, without embellishment or exaggeration. An authoritative and thought-provoking reference for readers seeking a greater understanding of all aspects of alternative cybercurrencies, this encyclopedia includes entries on economic history, international trade, current controversies, and its impact on the wider underground economy. It peels back the layers of jargon and obfuscation, giving each topic individual attention to show how it works and contributes to the whole.