Bitcoin is a digital currency that was created by Satoshi Nakamoto in 2009.It is created electronically and impossible to control it.This currency are not printed currency like dollars or euros.Running computer all around the world are producing it.Owing to this reason they are different from other currencies.
I think bitcoin was so different from other currencies is because of the price of it. As I know bitcoin is the highest value in all crypto currency or digital currency. And the bitcoin tax is free, it means that if you buy some thing and you use bitcoin as payment, there is no other charge or additional payment to buy that thing. It means that you buy that thing on its original price. And that is some thing why bitcoin is different from others.