On March 16th, the Cypriot President Nicos Anastasiades, who’d been in office for about a month, announced a strategy to solve the country’s banking crisis. This plan, which would be funded in part by confiscating money directly from every single bank account in Cyprus—even the very smallest—met with instantaneous and violent opposition from the country’s citizens. Offstage, the European Union, led by a group of adamant Germans, Finns, and Danes, as well as the I.M.F. and the European Central Bank, pointed a cannon at Anastasiades’s head: if he didn’t move forward with this plan, the Cyprus banks would go bust and their hapless customers would lose pretty much all their money, instead of a measly 6.75 per cent. However, under great pressure from their constituents, Cypriot M.P.s rejected the proposal and sent Anastasiades back to the drawing board.

The following Monday, the price of the decentralized electronic currency bitcoin rose from forty-five to fifty-five dollars on the major exchanges, and by Wednesday it had nipped up to sixty-five dollars. The financial media generally agreed that the two dramas are related. According to Bloomberg Businessweek, it appears that Spaniards are liable to have been particularly active buyers of bitcoins that week, having taken the debacle in Cyprus as the likely sign of a forthcoming governmental plunder of their own savings. The evidence coming out of Spain is circumstantial—a spike in Google searches for “bitcoin,” and another on mobile-app downloads of Bitcoin-related software were widely reported—but the pieces appear to fit. Subsequent developments (including the announcement of an eleventh-hour bailout deal for Cyprus) have so far failed to stabilize the euro or cool the bitcoin fever, with the price over a hundred and three at the time of writing.

That a number of panicked Europeans appear to have reckoned the wildly volatile, vulnerable, and tiny bitcoin market a preferable alternative to their own banking system, even temporarily, signals a serious widening of the cracks between the northern and southern E.U. countries in the wake of the euro-zone debt crisis. It also illustrates the broader collapse of trust that is threatening the world of global banking and fiat money.

The weakness in existing currencies stems from lack of faith in institutions—particularly central banks, which are often in league with commercial and investment banks. When a government bails out a failed bank or insurance company—in essence, by printing money—the net effect is that the currency as a whole is debased, in favor of a few and at the literal expense of everyone else, which amounts to a fair description of today’s global financial system. Hence the sudden appeal of bitcoins, which appear, for the moment, at least, to be immune to the machinations of inept or crooked bankers and politicians.

In many ways, bitcoins function essentially like any other currency, and are accepted as payment by a growing number of merchants, both online and in the real world. But they are generated at a predetermined rate by an open-source computer program, which was set in motion in January of 2009. This program produced each one of the nearly eleven million bitcoins in circulation (with a total value just over a billion dollars at the current rate of exchange), and it runs on a massive peer-to-peer network of some twenty thousand independent nodes, which are generally very powerful (and expensive) G.P.U. or ASIC computer systems optimized to compete for new bitcoins. (Standards vary, but there seems to be a consensus forming around Bitcoin, capitalized, for the system, the software, and the network it runs on, and bitcoin, lowercase, for the currency itself.)

Bitcoin releases a twenty-five-coin reward to the first node in the network that succeeds in solving a difficult mathematical problem requiring a certain amount of brute-force computation (known as a proof-of-work calculation.) The solution is then broadcast throughout the network, and competition for a new block and its twenty-five-coin reward begins. (There’s a good rundown of the technical aspects of Bitcoin on the Bitcoin wiki; there’s also a wonderfully pellucid explanation of the proof-of-work angle from Paul Bohm, on Quora.)

At first, anyone armed with an ordinary computer could download and run the Bitcoin software and gather (or “mine”) bitcoins. The more computing power you can dedicate to Bitcoin calculations, though, the better your chances of arriving first at each solution. This feature of the system, by design, resulted in a kind of computational arms race that strengthened the network by rewarding increased computing power. Four years into the Bitcoin project, only very powerful, purpose-built machines have enough muscle to keep pace with existing network nodes.

In this way, bitcoins are mined like gold used to be, in quantities that are small relative to the total supply, so that the supply grows slowly. There is an upper limit of twenty-one million new coins built into the software; the last one is projected to be mined in 2140. After that, it is presumed that there will be enough traffic to keep rewards flowing in the form of transaction fees rather than mining new coins. For now, the bitcoins are initially issued to the miners, but are distributed when miners buy things with them or sell them to non-miners (such as jumpy Spanish bank depositors) who desire an alternative currency. The chain of ownership of every bitcoin in circulation is verified and registered with a timestamp on all twenty thousand network nodes. This prevents double spending, since no coin can be exchanged without the authentication of some twenty thousand independent cyber-witnesses. In order to hack the network, you would have to deceive over half of these computers at the same time, a progressively more difficult task and, even today, a very formidable one.

In 2008, Satoshi Nakamoto, the founder of Bitcoin, whose real identity is not known, cleverly combined existing peer-to-peer network technologies, cryptographic techniques, digital signatures, and the potential power of network effects to design and develop the Bitcoin system. Nakamoto was very clearly motivated in this effort by the fallout from the 2008 financial crisis. When the experiment was launched and the first fifty bitcoins (the so-called genesis block) were mined, in January of 2009, he (or she, or they) included this line of text along with the data: “The Times 03/Jan/2009 Chancellor on brink of second bailout for banks.”

Until his disappearance from the Web, around the spring of 2012, Nakamoto was a visible participant on cryptography forums, where he discussed Bitcoin freely, and published a nine-page paper outlining the details of the project. These posts reveal that even in 2008, Nakamoto was able to respond to concerns regarding the scalability of bitcoin with remarkable prescience; he clearly understood the ramp-up of computing power that would be required for producing bitcoins as the system grew.