I've spent the last 4-5 months working on some software to recover a bitcoin wallet I lost the password to many years ago.  It is more advanced than anything I've seen available on the public internet.  It uses hashcat on the backend, and I've currently tested about 20 billion passwords.

Since I've spent so much time setting it up, I figured why not offer to help others in my situation?  My offer was going to be send me your hash, and I'll try to crack it for free. To gain some trust, anyone could send me an empty wallet hash with less than 50 million or so possible combinations, and I'd send them the password back. If it was a 'real' wallet, I wouldn't have it anyway.

I realize there are probably a lot of scams out there, and I would be getting password information that might be related to other accounts they have. Before sending a hash, anyone should make sure all their other account passwords have been changed to something completely unrelated.

My reddit account got banned as soon as I posted a guide to my own user account page.

Is there any way I could gain trust around this? I wouldn't be able to run it for free forever as GPU time isn't cheap, but I thought asking for whatever donation the user wanted after a successful recovery could offset the costs.

Any thoughts on this?  I created a domain specific language for specifying password combinations that took months to get right.  I feel like it could be more useful than just being used for my wallet.

Anyway, I hope I'm not breaking any rules here.  Just looking for feedback.