Bitcoin hash function

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The first one could generate is one of the kinds the hexadecimal number after processing.

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What the Hash? - How Bitcoin and Blockchains use Hash Functions
In proof of work, a cryptographic hash function is used on a block (group) of transactions. Bitcoin miners then use computing devices to find part of that hash. Cryptographic hash functions generate a fixed-length character string from data records of any length. A data record can be a word, a sentence, a longer text or. Hash functions are the basic tools of modern cryptography that are used in information security to authenticate transactions, messages, and digital signatures.