I just learned that nostr:npub1j9qyxka5lck4tw50v7qfrs6gdwczz5ydt7ugqy6nhuva9p6dpy5q8rs2yg has silent payments already implemented. Also they offer advice on how to harden the mobile wallet for more #privacy on their website.
And: they will integrate Lightning via nostr:npub1mu7nv2jkaq4xausnn098xc8tp3gzgf2w5r2cj68x8dnns0rktmysnsj5cl bringing it to their 280,000 users. Interesting.