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Funny fact - Sandisk products sold on Chinese market have additional 18-digit code protected by scratchpad, and you can verify authenticity of the card on http://verify.sandisk.cn. You don't need to unpack the card to scratch the pad and get the code for verification.

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How does that work? The code is valid only once or counterfeiters can just copy it on the new packaging?

Or is it based on "Trust in the scratchpad technology" ?

I'm not sure how the SanDisk one works, but other verification checkers in China have 'this code has been viewed X times' on the result page.

So if the counterfeit product has copied a real code, you might see 'this code has been viewed 33000 times' instead of 0.

Sandisk one works this way exactly. When you check the same code second time, you get the message '您输入的防伪码正确，但是已被查询过，您可以拨打400-670-6711进行人工查询,我们可以提供首次查询时间以及查询方式' (translation - 'The security code you entered is correct, but it has been queried. You can call Sandisk customer care for manual query. We can provide the first query time and query method.') with 'attention!' sign.

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