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But does it mean you pay 1% interest in SBD to people using your node and if so is there a possibility to use only your node for steem transactions...or i'm making such confusion and don't know nothing about this?

It's a blockchain property: witnesses are setting each a specific APR, and then it's using an average of that value to set up the APR globally for all users. If all witnesses will set 2%, then everybody on the Steemit blockchain will get 2% interest for their SBDs.

Thank you so much for your explanation :)

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