I find bitcoin extremely fascinating for a lot of different reasons. It's technically innovative and creative, and it holds serious promise for upending the global financial systems. The latter are currently controlled by corporations and central governments, and their cronyism hurts the Western poor, retards third world development, and destroys economic growth. A free and decentralized global monetary system would do wonders to increase liberty and autonomy.
This book covers the history of bitcoin. It's technical but still layman-friendly, and a major focus is on how it developed from the underground currency of the dark web--drugs, traffickers, assassinations--to the darling of Silicon Valley investment firms. Now, it's increasingly respected as a legitimate store of value, and a legitimate means of payment: over 100,000 merchants accept bitcoin today.
I'm concerned about some of the unresolved questions that the bitcoin community has to work through--technical controversies that pose barriers to broad global acceptance over time (for example, today the bitcoin protocol can process 7 transactions per second, while Visa can handle over 50,000). I hope they can resolve these items and clear away the barriers to global adoption.
As I heard a bitcoin enthusiast point out the other day, we ARE going toward having a cashless society--either by law or de facto. We WILL be using a digital currency. The question is whether you want to use a digital currency that is controlled, monitored and gatekept by governments and corporations, or use one that is decentralized, secure, private, and free. I know which one I'm hoping for.