This is seriously awesome, Martti. 💚🔥 I am building a Nostr client in Rust focused on Private Messaging (initially with just NIP-17 but optional Double-Ratchet is on the roadmap). I would be willing to donate where necessary to have this implementation in Rust (ideally in Nostr-SDK, if this gets formalised as a NIP? cc @Yuki Kishimoto). I'll cross-reference and test using Iris, when I begin this. 🙏