This seems more like a blind deal between curators and authors

Yeah but at the same time it doesn't have to be blind, we're going to add that option in the future but right now you can check what % they set by sending @reward.app a memo with a number from 0 to 100 which defines the % of author rewards they want their next post to go to curators. Then of course you also need to verify they set @reward.app as beneficiaries to know that's what's going to occur.