Since nobody has mentioned it yet, Andreas Antonopoulos' book, "Mastering Bitcoin," is quite good.<p>You can build the ePub from source:<p><a href="https://github.com/bitcoinbook/bitcoinbook" rel="nofollow">https://github.com/bitcoinbook/bitcoinbook</a><p>Or get it from oreilly:<p><a href="http://shop.oreilly.com/product/0636920032281.do" rel="nofollow">http://shop.oreilly.com/product/0636920032281.do</a>