Money is whatever people decides holds value. Doesn't matter what it is, seashells, gold, beanie babies, paper. Currency is just a faith based system. Fiat is a complete scam but most people are too stupid to realize or lack any real fight to go against the banks.
Alas, I do not agree with you, money is called the banknote of the Central Bank of your country and they only do what they print.
The rest of the securities are either gold or bitcoin are some assets that cost a certain amount which is expressed in money.
Bitcoin is a digital asset that can be attributed to digital money, but so far the problem is that payment with bitcoin is rarely applicable.