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Bitcoin: Currency of the future?
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Recently you mentioned bitcoin as a popular medium of exchange in the deep, dark Web. A couple friends have tried to get me to invest in bitcoin because it's supposedly the "currency of the future." What's the deal? —Josh

Virtual currencies are familiar to those who play massively multiplayer online role-playing games, or who maintain a cyber-presence in online communities like Second Life. For the most part these virtual currencies are divorced from the real world—you can become a virtual millionaire selling virtual real estate in Second Life and still be sleeping on your real-life mom's real-life couch.

Bitcoins are different. They're virtual in the sense that they exist solely in cyberspace, but they're expressly designed for the real world—specifically, any form of commerce where anonymity and untraceability are essential. Funds can be sent digitally across borders without physical transfer or anyone looking over your shoulder, and there are no fees or international exchange rates to worry about. For these reasons bitcoins originally appealed mainly to anarcho-utopian types, plus drug dealers, gamblers, and thieves.

Once the exchange rate for bitcoins shot up in 2011, speculators got into the act too, which I can't say classed up the situation much, but it did put the bitcoin on the financial map. At the moment the 11-plus million bitcoins in existence are worth roughly $1.2 billion.

The idea behind bitcoins isn't that complicated:

• Transactions are peer-to-peer. There's no central authority and no recourse. If bitcoins get stolen (and it's happened), they're gone.

• There's nothing backing up bitcoins. Their value is dependent entirely on what people agree they're worth.

• The system doesn't work on trust, though. Each bitcoin includes a log of all previous transactions in which it's changed hands. When a bitcoin is transferred between two parties, its transaction log is broadcast to all bitcoin participants. A subset of this group, called bitcoin miners, competes to perform what amounts to a validation test on the transaction log. This task requires a special high-powered computer rig to do the voluminous processing involved. Whichever miner is first to successfully validate the transaction log notifies the rest of the bitcoineurs, and the transaction is considered valid. This process takes between ten minutes and an hour.

• For their trouble, successful bitcoin miners earn new bitcoins. That's how bitcoins are created, ensuring the number increases slowly. Crucially, the system is designed so total coinage will top out at about 21 million. Bitcoins are thus immune to inflation.

A few meta-observations:

• One of the strengths of bitcoins, namely that their quantity is limited, is also a weakness. The money supply has to grow in proportion to the underlying economy lest we have deflation and depression. So bitcoins as currently constituted will never replace government-backed money.

• That's not to say bitcoins can't have a role as a supplementary currency. God knows we all engage in transactions we'd just as soon no one knew about. To the extent bitcoins become acceptable tender for everyday commerce, we can also avoid taxation, eventually transforming our overregulated society into a paradise like Greece.

• A drawback, however, is that the exchange rate between bitcoins and conventional money fluctuates wildly. In 2013 a bitcoin started off worth around $13, shot up to $266 in the wake of the Cyprus bank crisis, dropped within a week to $68, and has since ping-ponged between there and $154. (As I write it's at $103.)

• The tech world is full of brilliant inventions that fell by the wayside; when's the last time you used that Zip drive? Another worry: the bitcoin realm gets hacked, although it's proven resistant thus far.

Me, I'm confident bitcoins will never become worthless. I'll bet you a million BTC.