Punchscan.org
Punchscan is a voting system invented by David Chaum that allows voters to take a piece of the ballot home with them as a receipt. This receipt does not allow voters to prove how they voted to others, but it does permit them to:
* Verify that they have properly indicated their votes to election officials (cast-as-intended).
* Verify with extremely high assurance that all votes were counted properly (counted-as-cast).
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