Yes, but what you are brute-forcing is set: block and random number to get hash that start with defined number of zeroes. That's it. No other use. No brute-forc

Yes, but what you are brute-forcing is set: block and random number to get hash that start with defined number of zeroes. That's it. No other use. No brute-force of communication. It does not even help to brute-force passwords.