I've put installation instructions in the readme. Tested with Ubuntu 14.10.
Actually there was this other repo that was linked earlier ( https://github.com/cscott/bip38-cracker ) that is quite faster, probably because it uses scrypt-jane. I fixed it up to read the passwords from stdin so I can either crack from a wordlist or a generated list. Stuff's explained in the README.
It took ~20 hours on three n1-highcpu-16 machines on Google Compute. Each one did ~50 passwords per second, 150 total.
It cost around $38 overall.
So yes, cracking 5-char passwords is definitely feasible for relatively cheap. Would be way cheaper if I had used my own hardware.
The password? The cracker sent me the coins and then I destroyed the instances without writing down the password, silly me. Sorry!
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