I don't know if hiding author rewards is possible, or even desirable (?). Perhaps the money should be moved to something like non-author accounts with secret balances, so if one wants to remain anonymous as an author, he can write, get paid, his rewards will be public, but then the trail of money will be lost after he transfers his money to the non-author account that has secret-balance properties...

I don't know enough about the back-end system used right now, I'm just throwing ideas that could circumvent the problem (which in our case is that it is desirable by the platform programmers for the rewards to be transparent - and by extension for the authors to be paid transparently)