Cryptocurrency is rising. So are the stakes for governments everywhere.

For centuries, money issued by governments has served as the lifeblood of the global economy — the currencies in which people hold savings, make payments and keep accounts, and in which nations measure their wealth and geopolitical power. But in our digital age, it's facing a bizarre, postmodern sort of competition. Cryptocurrencies — created to supplant the traditional, sovereign kind — have become a widespread obsession, inspiring their own counterculture and attracting hundreds of billions of dollars in speculative investment that may or may not have anything to do with their viability.

How, if at all, should issuers of the world's official currencies respond? In a word: carefully. As financial regulators, they need to strike a balance between encouraging innovation and preventing harm. Most important, as competitors in the global market for cash, they need to improve their products.

Money comes in various forms, none ideal. Notes and coin allow for easy face-to-face transactions and serve as a mostly stable store of purchasing power, but they're costly to hold in significant amounts and no use for transactions at a distance. Bank deposits, along with the credit and debit cards connected to them, are more convenient but also flawed. They often entail hefty fees, and since (unlike fiat money) they aren't a direct liability of the government, they involve an element of risk — relying on institutions that don't always succeed in maintaining the public's trust. The 2008 financial crisis took a lasting toll on confidence in the banking system — one reason why holdings of physical currency have since increased.

Enter Bitcoin, the first cryptocurrency. In a 2008 white paper, the pseudonymous Satoshi Nakamoto described a system of electronic cash that would operate outside established channels and dispense with the need to trust any central authority or institution. A computer protocol would create new digital tokens. And a voluntary network of processing nodes would maintain a dispersed public ledger known as a blockchain, employing high-powered cryptography to ensure accuracy, security and anonymity. Instead of handling paper bills or transmitting deposits, people would make payments using private alphanumeric keys establishing ownership of their Bitcoin.

More than a decade later, Bitcoin and other cryptocurrencies have succeeded beyond their creators' wildest hopes — after a fashion. But they aren't actually functioning as money. They're poor stores of value, because their prices fluctuate wildly. They're also easy to lose: An estimated 20% of all Bitcoins are stuck in wallets to which people have lost the keys. They're not great for payments: Most places won't accept Bitcoin, and transactions are often slow and expensive, occasionally taking days or costing more than $25 each when the network is congested. They're extremely wasteful: The computations required to maintain the Bitcoin blockchain alone consume as much electricity as a midsized country, making a significant contribution to climate change.

These seemingly fatal defects, though, haven't prevented cryptocurrencies from becoming a cultural and financial phenomenon. They've taken on the trappings of a religious or revolutionary movement, promising a future in which decentralized networks displace not only money, but also companies, governments and society as we know it. This fervor overlaps with the hyperspeculative world of day traders, where crypto has become a favorite obsession — with help from the likes of Elon Musk, who put $1.5 billion of Tesla's cash into Bitcoin. The total market value of Bitcoin, a virtual asset with almost no practical use except for illicit commerce, recently reached $1 trillion. Even Dogecoin, created entirely as a joke, briefly topped $10 billion.

These remarkable gains are wearing down the resistance of the financial and political establishment that cryptocurrencies were intended to obliterate. Celebrity hedge-fund managers such as Paul Tudor Jones and Stanley Druckenmiller have piled in. Big Wall Street banks are recommending Bitcoin for investors and offering safekeeping services. Bitcoin-focused trusts and derivatives — and possibly soon a U.S. exchange-traded fund — offer exposure with no need to hold the actual stuff. Mastercard is planning to process payments denominated in cryptocurrencies. The mayor of Miami has proposed accepting property tax payments in Bitcoin. A big step toward the mainstream came when Coinbase — the leading crypto exchange, which earned more than $300 million amid the frenetic trading of 2020 — filed for an IPO that could value it at close to $100 billion.

Some guidelines for public policy:

• Don't stifle innovation. Cryptocurrencies and the underlying blockchain technology haven't fulfilled their original purpose, but they could yet have interesting and important applications. The blockchain's capacity to create unique and immutable digital records, for example, has enabled a burgeoning market for one-of-a-kind collectibles — such as art, music and sports highlights. Its decentralized governance has made way for new kinds of social media, such as Minds and LBRY. Facebook's proposed Libra system — now known as Diem — is one of many that might spur reform of slow, cumbersome cross-border payments. Authorities should be patient — giving entrepreneurs room to test concepts before subjecting them to the full weight of regulation — lest they quash ideas that could ultimately prove beneficial.

• Tread carefully in markets. It's not the job of regulators to stop people making risky investments, but they do need to ensure people know what they're getting into and don't harm others. The Securities and Exchange Commission is right to get involved when digital tokens adopt the properties of securities — as in many initial coin offerings. It would also make sense for the U.S. to join Europe and Canada in approving Bitcoin exchange-traded funds; this allows for adequate risk disclosure and custody procedures, and makes speculation safer and less costly for the unsophisticated investor. As more and bigger players get into the game, supervisors such as the Fed will have to ensure that exposures don't become large enough to threaten financial stability, and that institutions have ample capital to absorb any losses.

• Work on a better alternative. Give cryptocurrencies credit for one thing above all. They've highlighted an enormous shortcoming of ordinary money: There's no true digital version of cash — one that represents a direct claim on the government, can easily be transferred and is universally available. It's thus encouraging (for all except those heavily invested in the existing digital tokens) to see central banks getting ready to compete. The Fed and others are seriously considering the creation of their own digital currencies.To be sure, such radical innovation involves risk. A full-fledged central-bank digital currency would upset the business model of traditional banks. If people were able to hold government-issued money directly — the equivalent of opening an account at the central bank — they might dump the deposits that remain the banking system's primary source of funding. To avert a collapse, central banks would have to ease the transition — by setting limits on direct holdings, by using banks as intermediaries or by providing banks with alternative financing.

Then there's the issue of privacy. A digital currency could allow governments to keep track of people's spending — a possibility of particular concern in China, which is already testing its own digital currency. To alleviate worries about surveillance, central banks will have to provide a degree of anonymity, while maintaining the access needed to track down criminals and combat money laundering.