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I'm both pleased and annoyed by podatki.gov.pl/wykaz-podatniko
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 and some basic commands.
Annoyed:
- 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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