my friends lost his coins from offline wallet when he was chatting online on facebook messenger
sure he can't restore his coin
so how can protect offline wallet ?
I cannot think of ways how can an offline wallet be hacked or infiltrated by just chatting on online facebook messenger. As we all know offline wallet are highly resistant to attacks and also the way you tell your story lacks details. I guess he is using a cold wallet and possibly he was a victim of hardware keyloggers. Another possibility is that somebody knew of all the details about his offline wallet and just snatch it away from him.