provoost on Nostr: Mostr is a piece of software that bridges between ActivityPub (e.g. Mastodon) and ...

Mostr is a piece of software that bridges between ActivityPub (e.g. Mastodon) and Nostr.

There's a public instance at mostr . pub, but it tends to get blocked by Mastodon admins. I run a private instance on my own domain too, but only my own replies on Nostr can cross that bridge.
https://soapbox.pub/blog/mostr-fediverse-nostr-bridge/