I'm both pleased and annoyed by https://www.podatki.gov.pl/wykaz-podatnikow-vat-wyszukiwarka
It's for checking if NIP (tax id number) and NRB (bank account number) are registered.
Annoyed: yesterday it was giving me http 500 error.
Pleased: you can download a "flat file". A 7z packed json, that contains a list of `sha512(current date || NIP || NRB)`. I could use it with #bash and some basic commands.
- There's some weird shit going on with NRB masking.
- sha512 is not secure enough, so you must put it through 5000 rounds.
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