no mp3 -> add skin make is mp4 - upload to blossom your own or rented push is thing u need ask fountaon devs

may be fountain can read URL n play it without local storing

idk how blossom works (still got to learn that) but if it can support mp3 files then you just need to make an RSS feed and then connect that to Fountain or any other podcasting app.

Yes and no, Blossom works for hosting the raw audio/video files but you can't really use it for the RSS feed itself because that needs to be a static URL and with Blossom if you make a change to the RSS feed (say you add a new episode) it changes the URL of the feed and breaks things.

There Is another Nostr spec 😅, two weeks ago https://github.com/nostr-protocol/nips/pull/2211/files