Other thing that may take into consideration is the use of bots to gain trust, like someone receive positive trust from new participants and those same participants give trust between them.
That is an important thing to consider. My initial thoughts would be to limit it so one account can only leave one rating on another account, and have some minimum standard that much be reached before a new account is permitted to leave feedback. We can also add a Radon cost, to make botting financially unfeasible.
Thoughts?
In the world of corruption, the money is not the problem.
Maybe, in some point create accounts that it will not corrupt (I do not know how) maybe accounts with great trust, institutions, entities, something big that watch over for the community. I don't know, is a good debate.