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Andreas Antonopoulos' 'Mastering Bitcoin' book.

In my opinion the best technical resource on Bitcoin.

https://www.bitcoinbook.info

His book on Ethereum is still work-in-progress.

Seconded, big time. Blockchain was a hand-wavy haze for me until I got my hands on this book. As a programmer it's frustrating to read most high-level summaries of cryptocurrency/blockchain because they are often geared to a general audience and raise more technical questions than they answer - not so in "Mastering Bitcoin." The author does an impressive job of creating motivating scenarios before diving into concrete details. The chapters are well-sequenced but they stand up well to a bit of jumping around as your curiosity takes you in different directions. I thought this book was a real pedagogical achievement.

I'm looking forward to his book on Ethereum. In the meantime, Chris Dannen's "Introducing Ethereum and Solidity" is helping me to get a good grasp.

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