This colon should be replaced with a semicolon.
Colon can be used between two main clauses in cases where the second clause explains or follows from the first. http://www.oxforddictionaries.com/words/colon
The main task of the semicolon is to mark a break that is stronger than a comma but not as final as a full stop. It’s used between two main clauses that balance each other and are too closely linked to be made into separate sentences. http://www.oxforddictionaries.com/words/semicolon
This colon should be replaced with a semicolon.
Colon can be used between two main clauses in cases where the second clause explains or follows from the first. http://www.oxforddictionaries.com/words/colon
The main task of the semicolon is to mark a break that is stronger than a comma but not as final as a full stop. It’s used between two main clauses that balance each other and are too closely linked to be made into separate sentences. http://www.oxforddictionaries.com/words/semicolon
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The second clause is intended to explain the first, so isn't a colon appropriate?
Bitcoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network [instead of by a central authority].
Not really. It's more like:
"The road runs through a beautiful wooded valley; the railway line follows it."
than
"That is the secret of my extraordinary life: always do the unexpected."
I've asked around, and consensus seems to be that ';' is not really an improvement here (though ':' is awkward too), closing.