Very interesting, but this makes me wonder: "..product which enables the buyer to provide the producer with a password protected private key..."
That doesn't seem ideal to me. Every person it passes through will know the private keys. Would you get it, transfer the amount to a new wallet and then just keep the physical coin as a memento? I mean, they do look beautiful. :)
The private keys are protected by a tamper proof hologram on the back. The coins are value is more as a collectors item. The private keys that store your bitcoin are only as safe as the person who loaded them is honest. There have been some coins that had the bitcoin stolen off them by the creators i will cover that in up coming blog posts.
I look forward to reading more. Thank you.