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A hash is the output of a hash function, a function which is a mathematically reproducible but irreversible process that takes in an arbitrary length input and produces a fixed length output. The same input will always result in the same output. Hashing is central to Bitcoin mining as well as the generation of Bitcoin addresses.

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Why is HMAC-SHA512 used on root the root seed to create master private key and chain code in...

It seems for derivation of the master private key and chain node, the function is being used as a one-way hash function only, so why is a MAC being used? …
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