Some good resources for further understanding of Signal: Signal Tutorials by Infosec Bytes: https://www.youtube.com/watch?v=46ozj... - on Android: https://www.youtube.com/watch?v=XQzhW... - on iOS: https://www.youtube.com/watch?v=kiX8l... Introduction to Signal: https://freedom.press/news/signal-beg... Signal PINs: https://support.signal.org/hc/en-us/a... PIN-related feature: https://signal.org/blog/secure-value-... Moxie on Signal's future (unfortunately, not decentralized): https://signal.org/blog/looking-back-... Some news coverage on the PIN feature: https://www.zdnet.com/article/signal-... https://www.vice.com/en_us/article/pk... https://www.forbes.com/sites/kateofla... Moxie's take on the critical reception of the PIN feature: https://mobile.twitter.com/moxie/stat...