In my case, the item you provide is a quest item, and it cannot be traded. (Everything has a solution) The idea is "more votes, better".
The system currently works with: login-account, IP and Time vote.
Link updated, I already added public permissions. It is a relatively new project, to begin with it is not bad at all (and it is free). The idea is to improve it together.
In the future the idea would be an API to check if you have really voted or not.