It's just what I would like to listen at the conference. I don't know if these people are interested in speaking at the conference.

@mattn A great open source developer, an author of the Golang book, a writer for tech magazines, etc. He has already released some Nostr software, e.g. algia. He's also an organizer of upcoming magazine articles, which will publish a series of articles about Nostr in a few months.

I don't know much about Japanese bitcoiners, but @yutaro actively posts about Bitcoin topics on my timeline in both Japanese and English.