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vbuterin/pybitcointools
SImple, common-sense Bitcoin-themed Python ECC library
Vitalik Buterin's Python ECC library for Bitcoin operations — key generation, signing, transaction building. It was a useful learning resource and lightweight alternative to heavier Bitcoin libraries, but the author has publicly abandoned it.
Historical value as a readable, minimal implementation of Bitcoin ECC primitives. Small enough to read in an afternoon and understand what's actually happening under the hood. Served as a reference for how Bitcoin transaction signing works without the noise of production libraries.
The README is a resignation letter — explicitly unmaintained, single commit away from being reverted, author won't vouch for it. No source files in the tree, just a .gitignore and README, which suggests the repo has been gutted. Using this in anything that touches real money is a bad idea. The recommended fork is unvetted by the original author, so you're on your own for security review.