> Stamps on paper cards are more prone to fraud Given how much fraud is happening with customer data (that is: it being acquired under a pretense and then used

> Stamps on paper cards are more prone to fraud Given how much fraud is happening with customer data (that is: it being acquired under a pretense and then used for a different purpose), I very much doubt it. > require more physical product be printed, and are less convenient for users than online solutions. Except that's kinda orthogonal. The paper solution is easier to demonstrate to be free of back doors, but there is no reason why you couldn't build an "online solution" that doesn't do any tracking. You could just hand out random tokens without ever associating them with a transaction, and then accept sets of ten of those to redeem for a rebate, say.