Let me try to share with you the main learning points I collected from this book. As always, here it goes my personal disclaimer: the reading of this very personal and non-comprehensive summary by no means replaces the reading of the book it refers to; on the contrary, this post is an invite to read the entire work.
The book starts first with the concept of money, how money was an innovation itself, the functions of money as a medium of exchange, a unit of account, a store of value, a deferred payment and a value measure. It also provides some insights on the history of money and how credit is older than cash and, finally, a key concept: the monopolistic role of the government in terms of currency issuance.
There are some hints in the book to consider Bitcoin a starting point to end the monopoly of central banks. It claims that the Bitcoin value scheme is inspired on the old gold standard. It is interesting to read the links that the author sees between the Austrian School of Economics and Bitcoin.
The point that Bitcoin does not have a centralised clearing house is certainly a key point in the book. It also mentions that the blockchain public ledger is the heart of the Bitcoin technology. It also mentions that Bitcoin is inflation-free (there is a fixed number of Bitcoins that can eventually be minted). The supply of Bitcoins does not depend on the monetary policy of a central authority. It also remembers the Keynesian line of thought on deflation and how it encourages individuals and businesses to save money.
To use Bitcoins, you just need a Bitcoin wallet and a Bitcoin address. Technically, Bitcoin has currently a transaction limit of 7 per second.
There is a section of the book on legal aspects of Bitcoin. Apparently virtual currencies do not have legal tender status in any jurisdiction. Bitcoin has the properties of a payment system, a currency and a commodity. There is still a bit of regulatory ambiguity in terms of Bitcoin. There are some appendixes in the book related to a very useful glossary of terms, a legal guidance issued by FinCEN in the US, also from US GAO (Accountability Office), from the Inland Revenue Service, some input from revelant regulators and legal documentation on different Bitcoin-related cases.