Joe Nocera, Columnist

Sorry, Bitcoin Fans. Digital Currency Is Still a Dream.

I've been waiting for decades for someone to invent a currency for online purchases. And still am.

Maybe some day ...

Photographer: Chris Ratcliffe/Bloomberg

Bitcoin breaks my heart.

Not because I missed the great run-up (though I did) and not because I fear that the Bitcoin bubble will end badly (it will, but that’s not my problem). Rather, it is because I have been waiting for decades for someone to invent a purely digital currency, a currency for online purchases that wasn’t linked to a credit card. It was the killer app (as we used to say) that no one ever figured out.