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Mmm that's mean that we can't vote in the Blockchain issues?

You can actually vote for the witnesses with your hive stake.

Witnesses are like congressman? We vote they, and they vote whatever they want?

Haha, almost. You can actually vote the witnesses according to which APR for HBD they show. https://peakd.com/me/witnesses

Oki Doki, thanks a lot! Great articles for understanding better HIVE!
!PIZZA