Bitcoin Brainwallet Exponent Calculator

function brainwallet_exponent () { printf %s "$1"|sha256sum|head -c 64; }
A bitcoin "brainwallet" is a secret passphrase you carry in your brain. The Bitcoin Brainwallet Exponent Calculator is one of three functions needed to calculate the bitcoin PRIVATE key. Roughly, the formula is exponent = sha256 (passphrase) Note that this is a bash function, which means you have to type its name to invoke it. You can check the accuracy of the results here http://brainwallet.org
Sample Output
> brainwallet_exponent "correct horse battery staple"
> c4bbcb1fbec99d65bf59d85c8cb62ee2db963f0fe106f483d9afa73bd4e39a8a

> echo -ne "correct horse battery staple" | sha256sum
> c4bbcb1fbec99d65bf59d85c8cb62ee2db963f0fe106f483d9afa73bd4e39a8a  -

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Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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