The coins are "empty" de-facto. They use multi-signature security.

Security is crucial to us. That is why we've worked with talented developers to create a great tool that makes Bitcoin multi-signature easy to use.

Using multi-signature solves the problem of having to trust the person or company creating the physical cryptocurrencies. There are two keys to unlock the coin: the one under the hologram and the one you've created on your side. (You can do it on an offline computer to be sure it can't be compromised.)

We will never see your Passphrase (Your key), and you'll see our Coin Secret (Our key) only by removing the temperproof hologram. You will have the option to print a certificate with your Passphrase, Public Key and Coin Address after the order has been placed.

Thanks for your interest !