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Hash

Hashes are the cryptography part of cryptocurrency, and are what makes a blockchain secure, verifiable, and unhackable. Cryptographic hashes can take inputs of variable length, but always output a fixed-length string of numbers and letters.

Most cryptocurrencies use SHA-265, which always outputs a 256-bit string regardless of whether the input is "hello" or an entire sentence.

 

Source: https://www.techrepublic.com/article/mini-glossary-cryptocurrency-terms-you-need-to-know/

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