codecrafters-io/build-your-own-x: Build your own Blockchain / Cryptocurrency

This GitHub repository, codecrafters-io/build-your-own-x, is a compilation of step-by-step guides for re-creating popular technologies from scratch, introduced with the quote "What I cannot create, I do not understand," attributed to Richard Feynman. It is organized by category, including 3D renderers, AI models, BitTorrent clients, blockchain and cryptocurrency, databases, Docker, operating systems and programming languages. The Blockchain / Cryptocurrency section lists guides in languages such as Go, Python, JavaScript, Rust and Kotlin, including "Go: Code your own blockchain in less than 200 lines of Go" and "Rust: Building A Blockchain in Rust & Substrate."