One such improvement is the Sealed Sender feature: https://signal.org/blog/sealed-sender/ https://signal.org/blog/sealed-sender/ It's unclear to me is these ar

One such improvement is the Sealed Sender feature: https://signal.org/blog/sealed-sender/ https://signal.org/blog/sealed-sender/ It's unclear to me is these are part of the "protocol" or just the Signal client.