'Let's Encrypt is a free, automated, and open certificate authority (CA), run for the public's benefit. Let's Encrypt is a service provided by the Internet Security Research Group (ISRG).'
"The Obsidian Platform is a C# blockchain based on Stratis, with both Masternodes and Service Nodes. We have developed the Obsidian Secure Messenger (OSM) application, currently in public alpha testing."