Did you know that Bitcoin may be predicted in the bible? Some Christians may believe Bitcoin to lead to the mark of the beast:
Revelation 16 And he causes all, the small and the great, and the rich and the poor, and the free men and the slaves, to be given a mark on their right hand or on their forehead, 17 and he provides that no one will be able to buy or to sell, except the one who has the mark, either the name of the beast or the number of his name. 18 Here is wisdom. Let him who has understanding calculate the number of the beast, for the number is that of a man; and his number is six hundred and sixty-six.
There is a man who injected himself so he can walk around with his wallet inside his hands:
http://arstechnica.com/business/2014/11/man-has-nfc-chips-injected-into-his-hands-to-store-cold-bitcoin-wallet/
"....For the last 10 days, Martijn Wismeijer, a Dutch entrepreneur and Bitcoin enthusiast, has lived with an NFC chip embedded in each hand. One has data that he’s constantly overwriting; he can put his contact details in simply by having another person scan his hand with an NFC-enabled phone. But the other contains the encrypted private key to his wallet....."
If that was the case, the world would have to accept Bitcoin as a global currency, and also FORCE people to use it over any other currency and get the mark. That would still be quite a while off.
But it could be one day.
Thinking long term here.
I've thought about it a bit since I wrote last, and I think it would have to be a multi-sig key in the body (where one private key needed is from the beast, or has the number 666 involved). Also one key could maybe need a dna sample or something (which is why it would be in the body) to prove you're the one true owner.
The only way I can see this happening (in this theory) is that when the anti-christ comes, he would try to unite the world with world peace, ending all all wars, and moving to a currency that is used everywhere. Yes, there would have to be centralization, and not just a government centralizing it, but a world-government, like the UN. Sounds good to some people, I'm sure, world peace. But for Christians, it's about separation at the end. You aren't supposed to worship any God but the true God, and to say you won't worship the anti-christ will get you killed. That's not true world peace. According to Revelations, they would be forced to take the mark or else it would be impossible to buy food.
At some point, when Revelation comes to pass, there will be one common currency and you will need to prove you have the mark (which could be a second private key) and then people would be forced to not accept it without that second key. Cryptocurrency seems like a good fit. Maybe it wouldn't be Bitcoin, but a new altcoin with required multi-sig addresses.