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**Describe the solution you'd like** > a high-speed device, connected via a serial or perhaps USB interface, to manage authentication. This device can send an authentication challenge, receive a response, measure its timing, and verify it.
No Risk for You: There is absolutely no risk for those that purchase bills from us. No one knows we have them and no one knows their serial numbers. For both of our protection we don’t keep any records whatsoever. Furthermore buying cash is not illegal.