what if someday when bitcoin has become the main payment instruments in the world. and how when the Internet network paralyzed. it means that we all can not perform various financial transactions? , is there any solution ?
No need for internet. Just need to relay tx. Can use other forms of communication
yes, when you look on the past they have also financial transactions even though internet doesn't exist on that time. other forms of communication is the best solution for it. you just need to find it.