I didn't know either. It looks like they're a company who want to 'take bitcoin mainstream' http://blogs.wsj.com/digits/2015/03/10/secretive-bitcoin-startup-21

I didn't know either. It looks like they're a company who want to 'take bitcoin mainstream' http://blogs.wsj.com/digits/2015/03/10/secretive-bitcoin-startup-21-reveals-record-funds-hints-at-mass-consumer-play/?mg=id-wsj http://blogs.wsj.com/digits/2015/03/10/secretive-bitcoin-sta...