Awesome, yeah will have a listen. I know the fountain team are looking at audio books so it will be great to link in with them. 

My focus is books reading, tracking, challenges, reviews and maybe pointing folks to where they can find/read books since open library have a lot of books available to borrow. Further out I’d like to do more like allow books markets. If you are interested I have a rough roadmap on my GitHub readme.

What is your client’s focus? A review app? I hear nostr:npub1a2cww4kn9wqte4ry70vyfwqyqvpswksna27rtxd8vty6c74era8sdcw83a asking after something like that as it has some great benefits with nostr’s social graph for surfacing relevant reviews.