Git as Blockchain
summary
A working blockchain prototype is built entirely in Git: immutable lunch files, validate.js and balance.js to verify sums and nonnegative balances, git hooks to reject bad merges, and per-user wallets via git subtree. Identity uses RSA keys and SHA-256 fingerprints; commits are mined by brute force to meet a prefix target (proof of work via commit SHA with leading zeros). It defends against casual cheating but provokes an arms race and a 51% attack risk, so it works but at high cost and limited real-world necessity.
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