~snip~
I have a solution for the lottery round winner.
I want to say that don't credited the lottery winning balance instantly at user account. Tell the winner to post there with their user id. And when they will post here then credit their lottery winning balance at their account.
Why would anyone do that? You can't force people to post their wins and blackmail them if they don't do it.
It is only up to them if they want or don't want to do that.