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Update bitcoin-fundamentals-review.asciidoc

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Co-authored-by: Mark Erhardt <murch@murch.one>
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Andreas M. Antonopoulos 3 years ago committed by GitHub
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@ -45,7 +45,7 @@ It is impossible to reverse this calculation. Given a public key +K+, one cannot
Another important tool used extensively in Bitcoin, and in the Lightning Network, are _cryptographic hash functions_ and specifically the +SHA-256+ hash function.
A hash function also known as a _digest function_ is a function that takes arbitrary length data and transforms it into a fixed length result, called the _hash_, _digest_, or _fingerprint_. Importantly, hash functions are _one-way_ functions meaning that you can't reverse them and calculate the input data from the fingerprint.
A hash function, also known as a _digest function_, is a function that takes arbitrary length data and transforms it into a fixed length result, called the _hash_, _digest_, or _fingerprint_. Importantly, hash functions are _one-way_ functions meaning that you can't reverse them and calculate the input data from the fingerprint.
[[SHA256]]
.The SHA-256 cryptographic hash algorithm

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