They were doing something similar in Taiwan when I lived there 13 years ago. Each receipt had a lottery number on it, and every month or two there'd be a drawing of prizes. There was no need for a citizen to "register" their receipts... the onus was on the business owner. Making the receipt a lottery ticket caused ordinary citizens to expect and demand a legitimate receipt from each business, so the business couldn't skirt the taxes.
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They were doing something similar in Taiwan when I lived there 13 years ago. Each receipt had a lottery number on it, and every month or two there'd be a drawing of prizes. There was no need for a citizen to "register" their receipts... the onus was on the business owner. Making the receipt a lottery ticket caused ordinary citizens to expect and demand a legitimate receipt from each business, so the business couldn't skirt the taxes.