PBS News Weekend

The 8-year-old digital currency, Bitcoin, has made headlines for its surge in value into the tens of billions of dollars and because it's how some people pay each other anonymously on the dark web. Bitcoin is one of nearly a thousand digital currencies, which are not controlled by any country, fluctuate in value, and are traded on online exchanges. But Bitcoin is just one of many examples of the underlying technology behind digital currencies called the blockchain. Hari Sreenivasan recently sat down with author Don Tapscott, who co-wrote the book "Blockchain Revolution," to find out why he thinks blockchain technology may end up revolutionizing everything from financial services to intellectual property to democracy.