Send once, reach many. A sealed message published to a topic, or simply sprayed across an area, fans out device to device until it reaches everyone who's subscribed, even when no tower or server is in the picture. Emergency alerts, evacuation notices, event announcements, crew-wide broadcasts.
Topic-based pub/sub over hps:// fans a broadcast only to the people who care; members decrypt it, non-members carry it blind, and reach is acknowledged back across the mesh, so a one-to-many push is as reliable as a one-to-one message.
The same animations from the homepage, for Alerts & broadcast. Tab through the situations and watch a sealed message find a way across the mesh.
Your browser is running the real Hop protocol: every node above is the actual hop-core, compiled to WebAssembly, carrying real encrypted messages. Only the devices and their radios are simulated.