How old are we talking? I own what I believe is the most powerful password cracking cluster for pre v2.8 electrum wallets.

https://www.reddit.com/r/Bitcoin/comments/c2von0/i_built_an_insanely_fast_electrum_pre_v28_2017/

Well, I now upgraded it to a FPGA cluster.



30 GH/s.

If you need an old electrum password cracked, I feel like I might be your guy.

And hashcat just introduced support for the same! 250 MH/s on a 1080!

... With 10 GPUs. I'm still finishing testing the code, so if anyone wants to help with test vectors or if you have a wallet to crack, please contact me! I believe I might be able to easily adapt the code to Electrum < 2.8 if needed.

The system works with word mangling + dictionaries, so feel free to send those as well (one word per line works).

Here is the extract script, meaning I can't steal your bitcoins: https://pastebin.com/P3GZbFaL