The best way to vote on the mechanism, how to deal with

The best way to vote on the mechanism
There is a project to do a voting function (to vote for the work, there are bonuses, the first few thousands of dollars), the customer said the limit of IP (one vote a day), but the company was denied, because a LAN in the server appears to be the same IP, so many schools and other local area network users only vote. Now I can think of: login Cookies are implemented, but this one has a dead point, and a malicious user can clear ookie multiple shots. May I ask who has done the voting procedure and whether there is a better solution.

------Solution--------------------
Cookie + single IP daily limit + verification code

No matter the success of the vote, you give him a hint of success, so the basic is difficult to brush the ticket

You can also like Cnbeta's message, voting will not take effect in the server immediately,
The growth that customers see in the browser is, in fact, false, showing the user the number of votes recorded in the real +cookie

Let him think that it is successful, and so when the final results are published, the background data will prevail

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