Sounds fun to hear that " One World Currency" is Bitcoin but I must say that it's only be in crypto industries, many people and countries don't know about bitcoins and cryptocurrencies (as of now) later in future it will be called if fiat will be replace or bitcoins will be spread all over the world.
I wonder if all other countries would agree with that name as "One World Currency" because as far as I know, not every country liked Bitcoin and some did try to make their own cryptocurrency to fight against the Bitcoin adoption or they just don't really trust Bitcoin that's why they were planning to make their own cryptocurrency.
Bitcoin has a long way to go before other countries consider it as the world currency and so far this is the only decentralized crypto currency that has lots of adoption since the day Satoshi release it to the public.