You contradict yourself. You say money can be nothing (a computer entry) and then say it can be anything that's a store of wealth. Nothing is not a store of wealth. Not very convincing as an argument.
Money as it is today, only works while people have faith in it because it has little or no intrinsic value.
Using an inelastic commodity of intrinsic value (like a precious metal - agricultural commodities and oil are NOT inelastic) as currency removes control of the money supply from people who are corruptible and who have slowly eroded the system over time.
Money as it is today is in anything BUT a free market. Governments and banks control it completely. Central bank systems allow banks to operate as a cartel, in turn allowing them to make more money. i.e. price fixing. In a true free banking system, fractional reserve lending would be almost impossible.
US president Andrew Jackson once said "If the people only understood the rank injustice of our Money and Banking system, there would be a revolution before morning." This is as true today as it was then and it applies to all western central bank based systems. Fortunately for the banks no one bothers to understand.