Bitcoin, the original cryptocurrency, was launched in 2009. Today, there are thousands of cryptocurrencies with a total value of about $2 trillion. The surge in their prices earlier this year minted tens of thousands of cryptocurrency millionaires—at least on paper. Cryptocurrencies might turn out to be a massive speculative bubble that ends up hurting many naive investors. Indeed, many cryptocurrency fortunes have already evaporated with the recent plunge in prices. But whatever their ultimate fate, the ingenious technological innovations underpinning them will transform the nature of money and finance.

Myth No. 1

A cryptocurrency is real money that can be used for payments.

Cryptocurrencies such as bitcoin and Ethereum were designed as a way to make payments without relying on traditional modes such as currency notes, debit cards, credit cards or checks. The bitcoin white paper, which set off the cryptocurrency revolution, envisions an electronic payment system that allows “any two willing parties to transact directly with each other without the need for a trusted third party,” cutting governments and banks out of the financial loop. The website Pymnts claims, “Blockchain IS the future of the payments industry,” a reference to the computational technology that undergirds cryptocurrencies.

In fact, it has become very expensive and slow to conduct transactions using cryptocurrencies. It takes about 10 minutes for a bitcoin transaction to be validated, and the average fee for just one transaction was recently about $20. Ethereum, the second-largest cryptocurrency, processes transactions slightly faster but also has high fees.

Moreover, wild swings in the values of most