Cryptographic essence of Bitcoin part # 1: What is a Hash function?

Cryptographic hash functions are mathematical operations run on digital data. In Bitcoin, all the operations use SHA256 as the underlying cryptographic hash function.

SHA (Secure Hash Algorithm) is a set of cryptographic hash functions designed by the United States National Security Agency (NSA).

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https://hackernoon.com/cryptographic-essence-of-bitcoin-part-1-what-is-a-hash-function-f468e7f72daa?source=rss----3a8144eabfe3---4

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