The big exchanges that hold customer deposits are a big target for hackers, and unfortunately, most bitcoin exchanges store user funds.

Bitcoin is absolutely the Wild West of finance, and thank goodness. It represents a whole legion of adventurers and entrepreneurs, of risk takers, inventors, and problem solvers. It is the frontier. Huge amounts of wealth will be created and destroyed as this new landscape is mapped out.

The value of Bitcoin is astronomical, but the price goes all over the place as a million buyers and sellers try to figure out what that value is and how likely it is to manifest.

Personally, I had over 550 BTC in Gox. I will never get any of that back.

The public's got it right, a lot of NBA stars are arrogant and like to spend lots of money and have lots of girlfriends and all that.

We're constantly having to go head-to-head with the Bernie Madoffs of the world who just want more and more money.

I swore to myself that I was never going to lose again, and that's what drives me still. More than money, more than titles, more than fame, it's the desire not to be defeated.

It was all about flying round the world, working hard, being on the cover of Vogue, making money. It wasn't fun. It was exhausting, but I was young and convinced I knew best.