Public Keys, Private Keys, and Signing

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The concept Blockchains need a way to prove "I authorize this transaction" without a bank, a password database, or any central authority to check against. The tool that makes this possible is asymmetric (public-key) cryptography, specifically the Elliptic Curve Digital Signature Algorithm (ECDSA) on the secp256k1 curve, used by both Bitcoin and Ethereum. The core idea: you generate a mathematically……

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