Can you send the funds in escrow and make a hash of your number, so we can verify you didn't cheat?
If you do that, I'll give it a try. The answer can be guessed within 140 guesses.
escrow is no problem, will do that tomorrow but don't see why it's necessary, i'm not going to cheat
how do i make a hash?
Go to this website:
http://www.xorbin.com/tools/sha256-hash-calculatorFill in the exact number with some extra random letters and numbers in order to prevent people to bruteforce it.
It should look something like this
*yournumber* AK$t4tsl445 (any random letters and numbers)
Keep those letters and numbers, so if we can't guess it right, you'll be able to prove that we indeed didn't guess the number right.
If you've filled it all in, copy the sha-256 hash, and post it here.
Why would anyone want to bruteforce this for 1mBTC?