Not long ago, I was looking into how fiat currencies actually work, and I was surprised to discover how many people don’t understand why a piece of paper is worth something. It’s interesting to note that the fiat currency we use every day has no intrinsic value—we simply trust that the government backs it.

It all started in China, between the years 960 and 1279, during the Song dynasty. Imagine it: more than a thousand years ago, they were already experimenting with paper money. Before that, the world ran on the gold standard, where each banknote could be exchanged for precious metal. But when the Primera Guerra Mundial arrived, that system became impractical and fiat currency became popular worldwide.

The difference is striking. Under the gold standard, if the government issued more banknotes without increasing its reserves, the currency would be automatically devalued. Today, fiat money depends entirely on three things: the authority of the government that issues it, how much people use it, and the trust they place in it. The dollar is strong globally because it’s accepted in almost anywhere. The real, on the other hand, has less international circulation.

Obviously, this has its advantages. Producing fiat currency is incredibly cheap—you only need to print paper. You don’t depend on scarce metals like gold or silver. Also, it’s easy to transport and store, and it makes international transactions easier.

But here’s where it gets complicated. When there’s no tangible backing, the risk is real. Governments can print money without control, causing inflation or even hyperinflation. If the public loses confidence in the currency, its value collapses quickly. That’s what you see in countries with economic instability.

And this is where the contrast with cryptocurrencies comes in. While a fiat currency is centralized and controlled by governments and central banks, Bitcoin and other cryptocurrencies operate in a completely decentralized way. There’s no government printing more tokens; value is defined by supply and demand in the market, and transactions take place without intermediaries.

These are two different worlds. Fiat currencies are the foundation of today’s financial system, but more and more people are exploring decentralized alternatives. Understanding how a fiat currency works is key to understanding why crypto is so disruptive. If you’re interested in going deeper into these topics, Gate has good resources to explore both worlds.