Corrected entry: The precop explains that because each ball's grain is unique, they are "impossible to forge." If all they do is verify that the grain is unique, then all it takes for someone to forge their own ball is to make sure that it has a "unique" grain, i.e., different from the others. What kind of a security measure is that?
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Correction: For one thing, they would have pictures of the balls that are not fake, so your "unique" ball would be worthless. So the first point of the security is that you would have to somehow create a duplicate of one of the unique balls that was already loaded into the machine. The real point, however, is that once the ball was engraved (and again recorded), you can't substitute an identical ball with a different name as the name was recorded into a random place in the grain.
Myridon