Since i joined bitcointalk forum i find it difficult to make a post relating to bitcoin, bitcoin is like physical money (fiat), and i want to know the difference between fiat and bitcoin, and without fiat existence can bitcoin have a name?, after thinking all this with seriousness i concluded that bitcoin and fiat works like brothers and sisters and no one can leave each other, so i want to know if any other digital currency can function without fiat?.
Hmm this is actually an interesting question!
But to better understand the answer, we must first discussed on what "fiat" is all about. Fiat is a representation of money which has a value recognized around the world. Since it is the standard of currency used worldwide, every country has their respective value of money depending on several factors (e.g. inflation, gold reserves, etc.). Since fiat is a representation of money, we can now answer your question if BTC can exist without fiat.
The long answer is YES! It can definitely exist without fiat but there has to be some other representation of value which is BTC's equivalent. That could be anything which is in replacement of fiat.