Buying and selling with cryptocurrencies is hard. Every time you make a transaction, it’s recorded in the blockchain, a digital ledger. That takes up a lot of resources, such as hard drive space. But a new technology called the Lightning Network could offer a way to speed up the process. It’s a huge change in how cryptocurrencies could work. Marketplace Tech host Molly Wood spoke about it with Timothy Lee, a reporter at the tech news site Ars Technica. The following is an edited transcript of their conversation.