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I built a proof-of-work blockchain from scratch in C++23, now running a multi-node network I've been building a blockchain from scratch in C++23 for a while, and I figured I'd finally post it here and see what other C++ developers think. The project is called Amarian. I started it because I wanted to understand what actually goes into building a blockchain at the implementation level. It started small and ended up becoming a much bigger systems project than I expected. The node currently has: C++23 with CMake/Ninja SHA-256 / SHA-256d and canonical serialization Transaction, block and Merkle tree primitives Context-free and contextual consensus validation