It is interesting the fact that they create a physical BTC but I think it is still more secure and reliable to invest in the digital being, many people would try to falsify those physical currencies which is total loss
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There's some evidence of counterfeit Casascius coins from a years years ago, but they were not done well. It would be very difficult to re-create the Kialara contraption. The volume of these sold is so small that faking them probably is not worth anyone's time. But other tokens certainly could be faked.