tspacepilot@god:~/src/vanitygen$ ./vanitygen -v 1WALNUT
Yeah, probably just bad luck then. 7-character prefix will take a while on most hardware and the bad end of variance scales accordingly.
If you're keen on having it, generate a private/public key pair, post the public key here, and maybe some kind folks will attempt a search for you. See the discussion on split key generation a page or 2 back for details.
Right on, for the moment I've got no rush so I'll just let it crank away for a while. If I get desperate sometime a week or so from now then I may just take you up on that. Thanks TheRealSteve.
I'm not sure what version you are running, but I checked on my system:
$ ./vanitygen -v 1WALNUT
Prefix difficulty: 888446610538 1WALNUT
Difficulty: 888446610538
$ ./vanitygen -v -i 1WALNUT
Prefix difficulty: 27763956579 1WALNUT
The difficulty with and without the -i (ignore case) is different, and my ignore case is giving the same difficulty as your code dump.
It seems your version is looking for the all caps, but is showing difficulty equal to my ignore case command.
So all the probability is calculated based on a wrong number, it will probably take about 888/27 = 38 times longer to find a single key.
based on ~350Kkey/s about 20 days to hit the 50%