Bitcoin cryptographic hash function

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Hashing is also essential to of variable lengths to return.

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21. Cryptography: Hash Functions
The SHA cryptography algorithm is the block hashing algorithm Bitcoin uses for hashing new blocks and running the network. This algorithm creates output. A cryptographic hash function is a mathematical algorithm that takes a data input, often referred to as a message, and produces a fixed-length encrypted output. Cryptocurrencies use the determinacy and verifiability of cryptographic hash functions to confirm every transaction on their public payment.

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Ethereum, the second most popular blockchain, uses Keccak to hash information. Typical hash functions take inputs of variable lengths to return outputs of a fixed length. When you type in your password to log in, the same hash function is run on the word you've entered, and the server checks whether the result matches the stored digest.