Developer Builds Two-Node Lightning Network From Scratch in One Week

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A developer documented a week-long hands-on project to build a two-node Lightning Network from scratch in a local test environment, forgoing tutorials in favour of direct engineering work. The project involved compiling Bitcoin Core v31.99.0 from source code without sudo privileges, rather than using pre-built binaries. The exercise covered foundational Bitcoin concepts, including its ~7 transactions-per-second throughput limit and the tradeoffs that make it decentralised but slow. Lightning Network was explored as Bitcoin's Layer 2 solution, enabling thousands of off-chain transactions between parties with only two on-chain events — one to open and one to close a payment channel. The write-up aims to explain the engineering behind Bitcoin and Lightning without investment hype, focusing on what the technology actually does under the hood.

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