I really liked these audiobooks. I wanted to know more about crypto wallets. I was trying to find a more recent book, as technology changes quickly. However, the info given about crypto wallets was still very much relevant. I was able to confidently setup a wallet with full understanding. I didn’t get this for the alt coin book, but it still had some good information that I learned from. Highly recommended if you want to learn more about crypto wallets. You will learn what kind of wallets there are, how they function, what the security of each is, and recommendations for wallets.