Recently, I was reading about the history of Bretton Woods and realized something that remains relevant today: most current debates about Bitcoin, central bank digital currencies, and de-dollarization are, in fact, echoes of a problem identified over 60 years ago by a Belgian economist named Robert Triffin.

It all started in 1944. The United States managed to make the dollar the global reserve currency, promising that each dollar could be converted into gold at a fixed price of $35 an ounce. Other currencies were pegged to the dollar, and the dollar was backed by gold. In theory, it was a perfect system: exchange rate stability guaranteed by physical metal. It worked well during the first few decades.

But here’s the problem Triffin clearly saw: the very success of the system contained a fatal contradiction. As global trade grew, the planet needed more dollars to operate. But those dollars could only reach the rest of the world if the United States spent more than it earned, creating deficits in its balance of payments. Imports, military investments, all of that sent dollars abroad.

In other words: the more the system prospered, the more dollars circulated globally, and the less credible the promise that all those dollars could be converted into gold. The numbers simply didn’t add up. This was the essence of Triffin’s dilemma: a national currency cannot serve simultaneously as a global reserve currency and maintain its credibility in the long term.

Triffin was a professor at Yale, a consultant for the IMF and the World Bank, and an expert in international monetary systems. He was not a disconnected theorist. He warned about this in the 1960s, just as France and Germany began to question whether there was enough gold to back all that circulating dollar mass. The pressure was quietly mounting.

In 1971, Nixon confirmed it: he abruptly suspended the dollar’s convertibility into gold. The Nixon Shock buried Bretton Woods and transformed the dollar into pure fiat currency. No gold. Just trust, debt, and geopolitical power. Exactly what Triffin had predicted as inevitable.

What’s fascinating is that Triffin’s dilemma never disappeared. It simply changed form. The world still depends on the dollar for trade, finance, and reserves. The U.S. continues to provide that liquidity through increasingly large deficits. But now without the gold brake. The result is a system sustained by inertia, but accumulating tensions: growing debt, global imbalances, and a constant search for alternatives.

And that’s precisely what we see today. Bilateral agreements between countries to avoid the dollar, central banks developing digital currencies, Bitcoin emerging as an alternative to the traditional system. All responses to the same fundamental problem Triffin identified: the fragility of a system based on a national currency that needs to perpetually borrow to support the world.

The global monetary architecture is once again in transformation, and Triffin’s dilemma remains the compass for understanding why.