TLDR: signal content in Apple notification can be retrieved even after signal app deletion.
I saw from this reddit thread: Signal messages retrieved from iPhone after uninstalling app. : signal
Referencing this news article: Pretti Killing May Affect ICE Prairieland “Antifa Cell” Terrorism Trial
The mention of signal is in court documents here: March 10: Federal Trial Day 12 - Support the Prairieland Defendants
Signal chat evidence from Sharp’s device (Exhibit 158):
Messages were recovered from Sharp’s phone through Apple’s internal notification storage — Signal had been removed, but incoming notifications were preserved in internal memory. Only incoming messages were captured (no outgoing).
Well, of course. All notification contents go through Apple’s servers (or Google’s in case of Android).
Not all, no. There are alternatives on Android:
https://tuta.com/blog/google-push-alternative#alternatives-to-google-push
Signal for android uses web sockets for notifications
Only in absense of google play services.
Source: https://github.com/signalapp/Signal-Android/issues/13290#issuecomment-1848588865
Why would a notification need to leave my device at all?
Because it’s FAANG
A lot of notifications originate off your device.
It’s not because of push notifications. the message is not sent to firebase, just a signal that the app should do a refresh.
It’s because the system saves the notifications apps posted to the notification menu.
As I already replied om one of your other comments:
Is is 100% because of firebase. Here is an example payload from firebases official document:
{ "message":{ "token":"bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...", "notification":{ "title":"Portugal vs. Denmark", "body":"great match!" } } }https://firebase.google.com/docs/cloud-messaging/customize-messages/set-message-type
Notification history is purely local to the device. It is not sent to any servers.
my reply on another thread: https://sh.itjust.works/comment/24730726