Right now, you've got three days between a trade and a settlement, with hundreds of millions in settlement risk tied up in that time. That all goes away in a blockchain system because you've reunited the trade with the settlement. They're not two separate processes.

How high can bitcoin go? The real question is how low can the dollar go?

With the block chain, for the first time, we no longer need these central institutions for settlement or for guaranteeing the value of coins or for land titling. All of these functions can be replaced by a transparent public ledger that is safe from tampering and which can make value and ownership clear and open for everyone.

When we look at government in Washington or what's happening on Wall Street, we see so much centralization. But really, our goals should be to eliminate and overcome these central institutions. And in recent years we have gained powerful new tools to do this, and most significant among those is the block chain, which is the software behind Bitcoin.

This is where the block chain is most useful and revolutionary: It helps us to overcome the problem of mutual trust in exchange, which will, in turn, make many of our modern central institutions unnecessary.