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Cryptos is a pure Python implementation of major Bitcoin concepts built from scratch for educational purposes. It deliberately avoids external dependencies so readers can inspect how the underlying cryptography and protocol mechanics work. The project implements SHA-256, finite-field elliptic-curve mathematics, Bitcoin key generation, addresses, and ECDSA digital signatures. It can parse and inspect legacy and SegWit transaction structures, although its transaction validation is intentionally incomplete compared with a full Bitcoin node. Block utilities cover headers, proof-of-work validation, and difficulty calculations. ...

cpuminer is a multi-threaded, highly optimized CPU miner for Litecoin, Bitcoin, and other cryptocurrencies. Currently supported algorithms are SHA-256d and scrypt(N, 1, 1). It supports the getblocktemplate mining protocol as well as the Stratum mining protocol, and can be used for both solo and pooled mining. Notice: Please see here to understand why this package is recognized as a threat by some antivirus software: https://github.com/pooler/cpuminer/issues/13