I've been toying with the idea of putting some spare 3090's to work and cracking wallets with hashcat. However, I'm unfamiliar with how to obtain wallets. I see some sites that "sell" them, but I'm weary they may be scams. Are there resources/groups I can contact where I can offer to try and crack a wallet?
Trying to crack wallets with a balance with a password that can be guessed, or at least knowing part of it, with the ease of predicting these words, is the only possible way, but the owner of such wallets will not sell them on the Internet for $ 100, while he can get more if he sends them to a specialized wallets restore team. all wallets that are sold on the Internet are scam or not worth the trouble of trying to find out the private key.
you can provide recovery wallet services that provide the ability to crack passwords with some complex conditions but such service are managed by people who have good experience in this field and are reliable. even if you try to create such a service, you will not find much support. You are burning your money in a losing project.