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Edited ch04_keys.adoc with Atlas code editor

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@ -977,7 +977,7 @@ combined execute about 2^80^ hash functions every hour. They run a
different hash function than HASH160, so their existing hardware can't
create collision attacks for it, but the existence of the Bitcoin
network proves that collision attacks against 160-bit functions like
HASH160 are practical. Bitcoin miners have spent the equivalent of
HASH160 are ((("HASH160")))practical. Bitcoin miners have spent the equivalent of
billions of US dollars on special hardware, so creating a collision
attack wouldn't be cheap, but there are organizations that expect to
receive billions of dollars in bitcoins to addresses generated by