Urbit? Yea. And even more interesting is https://groundwire.io/ - they're re-doing the identity layer using Bitcoin, and are working on a nostr client.
I tried it and it's all a little buggy so far, but I know there are good people working on it.
...All that said, I'm pretty exhausted by urbit at this point. I have very little patience for it and it's history of baggage and stupid ideas.
