Two weeks ago, Charlie Shrem got hacked and robbed, Bitcoin-style ... he has a jewelry engraver. He took a piece of silver, and he engraved it into a ring." Well, he engraved most of it into ...

That's the idea behind the bitcoin ring, a 3D-printed piece of jewelry with a QR code that lets anyone with the corresponding app see how much cash you've really got. If you want to get one ...