I really think it is really becoming an international currency there are so many people all over the world that is using it,
And it doesn't matter where ever you are as long as you can access the internet you can send and receive bitcoin.
At the time when everyone in the world will have bitcoin and will be accepted for payment and other transactions all over the world even for state then we will call it as global currency while in current situation we call it as international currency so it is said that bitcoin is an international currency because it is adoptable in every corner of the world.