This. Andreas' book is awesome. It will give you a high enough level to understand all the moving parts, then it deep dives into how they all work. A+++ will bu

This. Andreas' book is awesome. It will give you a high enough level to understand all the moving parts, then it deep dives into how they all work. A+++ will buy again. Once you've read Mastering Bitcoin, install the reference implementation, and start playing with the API while pointing to the testnet. When you get stuck, look to the Bitcoin reference documentation... it's pretty good too. Happy hacking