Laser engraving Card Question!

[valkir]

Hi all

I'm looking to buy a laser engraved card but I got a question.

How I'm sure that the companie do not keep the private key?

I mean with the private key, they are able to get the bitcoin on my wallet?

I'm not sure to understand the bip38 stuff! Anyone can help? 

Thanks

[deepceleron]

BIP38 (Bitcoin Improvement Proposal) encrypts the private key with a passphrase, so it is acceptable to have a third-party manufacture a paper wallet or storage token with this, providing the passphrase is difficult enough. They cannot spend without knowing or cracking the passphrase.

Without encryption, even if you sit there and watch them put the key into the laser engraver, print it, and delete the file, you can never be sure. They could recover hard drive data or there could be a keylogger installed by them or a hacker. There might be a camera system or even be an operator with an eidetic memory which would allow the key to be discovered or recalled later.