How to track the cheating of VK voting?

Question

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Hello. The question arose of how I can track down the cheating of voters? It only comes to mind to check if these participants who voted in the poll are in the group.
I'm using voting as a contest and don't want fake winners.

Answer 1

Parse voters and compare with the list of the group, you can compare in excel

Answer 2

Well, there are actually not so many options
1) As already mentioned above - check for those who have joined the group
2) Put a callback on the group and enter the date of entry of the participants into the database. After the end of the voting, drive the participants through the database and discard those who joined during the last 0-3 days.
3) Analyze the profile of those who voted, or rather the date of their registration. If cheating through new accounts - ignore. But there are also cheat services, so this is an option