That's the key right there. When you go to the store to make a purchase, what do you get? A paper receipt that tells you what you purchased, how much money you spent, and the amount of sales tax you paid. In other words, a record of your purchase.
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I just presented a method for the voter to verify their vote in an anonymous system.
Ever see door-prize or raffle tickets that are torn in half?
The tear match is the verification.