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InfluxDB
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The code is written in C++ and the latest versions of bitcoin have A LOT of code which is hard to get your head around. I have personally created a cryptocurrency from scratch so I understand the process of learning how bitcoin works from a technical point of view and understanding the code behind it. What I'd recommend for you is to have a look at the original code published by Satoshi Nakamoto (here's a link https://github.com/Maguines/Bitcoin-v0.1/tree/master/bitcoin0.1) and try to understand what the code does. It's really not rocket science for a decent programmer, unlike the modern versions of bitcoin which have been developed by hundreds of people, and would give you a really good start.