ElectionGuard, an open-source software kit Microsoft launched last year, gives voters the ability to confirm that their ballots are counted accurately. In jurisdictions using the software, voters will receive unique codes — which don’t reveal their choices — that can be tracked online as their ballots are processed and counted. Tom Burt, Microsoft’s vice president for customer security and trust, likened it to a ‘“tamper-proof bottle” in a May interview with NPR.

But the success of ElectionGuard is dependent on voting-machine manufacturers incorporating the software kit into their equipment. So far, two of the largest vendors of voting equipment — Elections Systems & Software and Hart Intercivic — have worked with Microsoft.

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