Lightning Network runs on the bitcoin (or other) blockchain and is a new technology that will enable near-instant transactions with near-zero fees. Our btcpay server has lightning built-in. It's not a priority until after the main stuff is up and running, but this page is for notes for reference when that time comes.
René Pickhardt is a data analysis expert and has made auto pilot script to automate the process of finding and assessing other lightning nodes, and advising which ones to open channels with, along with how much to fund them. Lightningd have included it in a plugin.