[MUSIC] I want to start this next set of lessons with a quote from my friend, Dr. Ann Cavoukian. She's a distinguished Expert-in-Residence, leading the Privacy by Design Center of Excellence at Ryerson University. And Ann and I also wrote a book about privacy in the mid-1990s. Okay, it wasn't exactly a bestseller, it was probably a decade or so before its time. But anyway, Ann once said, and I quote, freedom is predicated on privacy, unquote. Think about that for a moment. Your freedom depends on your privacy. We found one of the first decentralized peer to peer platforms, for preserving user privacy. It's called Enigma. It was designed at MIT Media Lab. Enigma combines the virtues of blockchain's public ledger with something known as homomorphic encryption, and secure multiparty computation. That's a mouthful, but it means Enigma takes your information, breaks it up, and encrypts it into pieces of data, randomly distributed to nodes in a network. No single node handles all of it. Enigma enables blockchain to embed the data and track all of the pieces of it. So you can share your data with third parties. These parties can use it without ever decrypting it. In essence, your data exists in a virtual black box and you alone control it. You alone can see it in its entirety. This concept is worth taking seriously. It's the principle of what Ann calls "privacy by design." That means we design privacy into our innovations. It's privacy by design, it's not an add on. It's one of the seven design principles underlying blockchain technology, such as security by design and integrity by design. This module walks you through each of these principles. For each, we describe a big problem to be solved, and the blockchain solution, and we discuss their implications for the digital economy. We hope these design principles will inspire you as you think about your roles in the blockchain revolution.