Have you tried verifying your contacts? It's clunky, but I believe this is how signal handles the problem: https://support.signal.org/hc/en-us/articles/3600070

Have you tried verifying your contacts? It's clunky, but I believe this is how signal handles the problem: https://support.signal.org/hc/en-us/articles/360007060632-What-is-a-safety-number-and-why-do-I-see-that-it-changed-#safety_number_view https://support.signal.org/hc/en-us/articles/360007060632-Wh... Using signal without verifying contacts is like bit like using HTTPS without verifying certificates. It prevents passive monitoring.