Blockchain is a revolutionary computer programming technology that was first proposed in 2008 with Satoshi Nakamoto's white paper on Bitcoin. However, its roots go far deeper, as Nakamoto's white paper actually built on advances and ideas in cryptography and cybersecurity that date all the way back to the early 1990s. Today, blockchain is turning into an Internet phenomenon that is changing how we think of cybersecurity and how data can be safely managed and maintained. This book will give you a detailed, under-the-hood look at how blockchain works. The first chapter will go into detail about the model that most of the Internet is based on, the client-server model, and why it is showing signs of age. The Internet is unable to keep up with the popularity that it has spawned, and it is facing increasing challenges at keeping up with its own demand. Additionally, the centralization of the client-server model makes the information prone to tampering, manipulation, and hacks. The second chapter will look at how blockchain technology provides the answers to many of the problems created by the aging client-server model. The third chapter takes a technical look at how blockchain works, but in a way that is easy for newbies to understand. It looks carefully at what different terms mean and explains them in an easy-to-understand format. It then details how a blockchain transaction works, from beginning to end. By the time you finish reading this chapter, you will feel confident that any information that you send over a blockchain is safe and will reach its destination in one piece. Blockchain isn't without its problems, though. The fourth chapter will explore some of the problems that blockchain is facing as it matures and enters the world of mainstream business and finance. These problems include legal issues, environmental issues, scalability issues, and consensus issues. More than explaining the issues, though, it looks at different solutions, some of which are already being implemented. The fifth chapter gets into how you can make money as a miner on a blockchain network. It gives you detailed, step-by-step information on what you need to do, from having a cheap source of energy to understanding mining protocols to building a mining rig. Finally, the sixth chapter looks at some other ways that you can earn money with blockchain. You can earn money by building your own business on a blockchain, becoming an expert and consulting on it, and by investing in cryptocurrency. There are plenty of other ways that you can earn money with blockchain. The field is brand new and ripe for exploration.