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An acronym for the algorithm used to secure (encrypt) Bitcoin transactions. It stands for Secure Hash Algorithm – 256 bits. What this means is that a 256 character long, nearly-unique, hash is created for each transaction. SHA-256 is a one way algorithm, meaning it cannot be decrypted back.


  • George Levy – What is a SHA-256 Cryptographic Hash Algorithm? Youtube
  • (Very) Basic Intro to Hash Functions (SHA-256, MD-5, etc)Medium