@icedquinn Except that the currency-type has little to nothing to do with war ("money is money").
WW1 took place under the gold standard, WW2 saw a limited gold bullion standard (and Bretton Woods), The Korean war + Vietnam war + Bamileke and many more happened under the Bretton Woods system before the "Nixon Shock" in 1971 when it all turned into fiat currency.
ISIS and ISIL were known to use BTC as well for their wars.
@kaia Fiat indexes are usually backed by reserves of (internationally) valuable resources. Putting aside if gold is a good choice for that. You can also back something by the availability/demand of oil, or the price of potatoes, or the profit of a company. But those are tangible things. Bitcoin is like Art, in that it's demand is only sourced by it's popularity. And Bitcoins availability is directly linked to mining difficulty. Might make a detailed post once I have a higher limit.
@kaia according to Forbes, the dollar in particular is backed by production. So the stuff in the US being on sale for dollars. Didn't know that. So aside from the production being localized (stuff made in the US usually sells for dollars), it's similar. I heard that some nation already uses crypto for local payments, so I guess that would give it backing.