Technically nothing prevents them from storing metadata on servers - only contents of messages are encrypted, same with Matrix. So, you have to trust Signal servers.
They also know your phone number 😅. 
Signal is so much celebrated because it has great UX, large userbase, battle-tested encryption (WhatsApp is based on the Signal protocol) and it was the first. 



 

 can't wait for SnubHub release! 

 definetely some wizardry is happining here. is it safe? 

 But people from HN are devs or at least technologically savvy. How is it that they cannot understand the basic ideas of such a simple but ingenious protocol? 

 that's crazy 

 test 

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 3:00 test