Verifying the winner's account and sending keys manually

I'd like to suggest two features for consideration:

1. Checking whether the winner, after claiming a prize, activated the game on their own account or (on their main account, and if they used a third-party account to win)
2. Perhaps we shouldn't automatically send the key to the winner, but instead allow the user to do this themselves (so they can independently verify the user and, if suspicious, notify them or select a new winner (there's some kind of trust factor, but I haven't figured out how it works yet).