The only way to check your passphrases database is to compare the generated brain wallets with your local database (take it from daily blockchair dumps -
https://gz.blockchair.com/bitcoin/addresses) or take from Loyce.
That assumes you'll find a funded Bitcoin address, which is unlikely. By checking against the full list of
all Bitcoin addresses ever used, you may find brainwallets that have been used in the past.
I'm not sure if brainwallets were ever used for Segwit addresses.
Has anyone figured this out using
bitcoin-tool? I've used it in the past, performance isn't bad, but the command line is quite complicated to get correct.
you will need to use a hashing algorithm that can handle a sufficiently large number of items
I didn't expect SHA256 to be so slow. I just tested a simple bash loop, and get less than 1000 hashes per second. That won't scale well to 40 billion inputs.