It seems to use DHT under the hood whether directly or through a relay. https://pkdns.net/ .

The info graphic shows the flow in `What is iroh?`, and quickly looking at the endpoint area you can see what the key is: https://docs.iroh.computer/connecting/creating-endpoint#pers...

It might be the docs just mesh with how I think about things. The creators should expand on this, since people seem to not mesh with the current info.

They mention later on it's an Ed25519 key.

I suggest going through https://www.youtube.com/watch?v=RwAt36Xe3UI for an explainer.