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Edited ch04_keys.adoc with Atlas code editor

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@ -508,7 +508,7 @@ For example, imagine I want to ask you a question and also give you my
answer in a form that you can't read immediately. Let's say the answer in a form that you can't read immediately. Let's say the
question is, "in what year did Satoshi Nakamoto start working on question is, "in what year did Satoshi Nakamoto start working on
Bitcoin?" I'll give you a commitment to my answer in the form of Bitcoin?" I'll give you a commitment to my answer in the form of
output from the SHA256 hash function, the function most commonly used in output from the((("SHA256 hash function"))) SHA256 hash function, the function most commonly used in
Bitcoin: Bitcoin:
---- ----
@ -533,7 +533,7 @@ was the exact same key that was used to create that earlier commitment.
The SHA256 hash function is considered to be very secure and produces The SHA256 hash function is considered to be very secure and produces
256 bits (32 bytes) of output, less than half the size of original 256 bits (32 bytes) of output, less than half the size of original
Bitcoin public keys. However, there are other slightly less secure hash Bitcoin public keys. However, there are other slightly less secure hash
functions that produce smaller output, such as the RIPEMD160 hash functions that produce smaller output, such as the ((("RIPEMD160 hash function")))RIPEMD160 hash
function whose output is 160 bits (20 bytes). For reasons Satoshi function whose output is 160 bits (20 bytes). For reasons Satoshi
Nakamoto never stated, the original version of Bitcoin made commitments Nakamoto never stated, the original version of Bitcoin made commitments
to public keys by first hashing the key with SHA256 and then hashing to public keys by first hashing the key with SHA256 and then hashing