First of all, lets clear that most of banks and government no longer backed by gold which it was used to be. now days they called it Bond. but its not like james bond. they use this bond as collateral packed with person to famous lands around the world and this is happening in all banks around the world.
as many knows bank international runs by rothschild and other few group. they holds most of real physical gold and government security and also runs IMF and World bank. So if you ask me about US Dollar and Gold, i would say laugh first because its backed by nothing. it exist because people allow it.
yes i admit that real physical gold can be use in many technology as metal which can be very useful. but as value of price its totally inflated both US Dollar and Gold.

Bitcoin Is Unique if people stop Speculating and use it just as payment system it can change lots of problem around the world

Fun Fact:- The highest-denomination note ever printed was worth $100,000.