David Marcus, the former President of PayPal and Vice President of Messaging Products at Facebook, says that the Bitcoin Lightning Network will soon be the most widely used payment network in the world. He and his team at Lightspark believe that Bitcoin (BTC) is going to be the neutral settlement network and asset for the world and that Lightning will make it cheaper and easier to make payments with BTC. In our interview, we discuss this as well as how Lightspark makes it easier for companies - including Coinbase - to integrate and engage with Lightning.