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Sometimes it's hard to tell whether Bitcoin is more like Ponzi scheme or a pyramid scheme.

Whatever it is, though, it isn't a currency. It's a tech stock. Each Bitcoin is really a share in a systemthat seems to make it cheaper to transfer things onlinemoney, stocks, bonds, even the deed to your houseby cutting out the middleman. Well, kind of. Bitcoin doesn't remove the middleman so much as replace himwith middlemen who don't make you pay much, but make society as a whole do so instead. Is this progress?

It's supposed to be. Ever since the early days of the Internet, people have been trying to figure out how to transfer money online without having to go through the financial system. The problem, though, is if Isend youmoney, how do you know I haven't already spent it or sent it to somebody else? You don't. So the only solution has been to have a trusted third-party, like a bank, sit in between us. I send the money to the bank, it verifies that I actually have this money to send, and then it sends it on to you, all for a 2 percent fee, of course.

Bitcoin's breakthrough is to have a decentralized network of "miners" sit in between us instead. Now, remember, these miners are trying to win new Bitcoins by solving computationally-taxing math problems. The clever part, though, is that in the process of doing so, they also create a public ledger of every single Bitcoin transaction, what's called the blockchain. That includes every Bitcoin that's ever been won, every Bitcoin that's ever been used, and every Bitcoin that's ever been transferred. So now we don't need a bank to know that I have the money I'm sending to you, and that I'm only sending it to you. The miners confirm all this. And the best part is that instead of having to pay the bank myself to do this, the system pays the miners in new Bitcoins.

The question, though, is howyou get people to mineBitcoin to begin with. Sure, you can tell them that Bitcoin is digital money they can use to buy things online, but they already have money they can already use to buy things online. And while merchants would be more than happy to save the 2.5 percent they pay in credit card transaction fees, customers are a lot more more blas since they don't pay them directly.The answer, then, was to do what makes anything popular: make it exclusive. Specifically, Bitcoin limits the total number of coins that will ever be created to 21 million.Now, for Bitcoin's first year and a half, as Nathaniel Popper documents in hispage-turning history Digital Gold, there were still only a handful of people, if that, mining it. But that began to change when libertarians, who were convinced, just convinced, that the Federal Reserve's money-printing would mean the doom of the dollar, discovered Bitcoin and its non-inflatable money supply. A boom was born.

But what made people mine Bitcoins is what has kept from spending Bitcoins. Think about it like this. Bitcoin's finite supply means that its price should go up, and keep going up. So if you have dollars that are losing a little value to inflation every year and Bitcoins that are gaining it, which one are you going to use to buy things with? The question answers itself, and it raises another. Why would this ever change? Unless you can't buy something online with dollarslike drugsyou'd always want to use your dollars instead. Buying things with Bitcoin would be like cashing out your Apple stock in 1978 to go grocery shopping even though you have plenty of actual cash lying around.

The catch-22is people buy Bitcoins because they think the price will go to infinity and beyond once everybody uses them, but they don't spendtheir own Bitcoins because they think the price will go to infinity and beyond once everybody else uses them. And so nobody uses them. But if nobody uses them, then the price will stay stuck at something a lot less than infinity let alone beyond. So the Bitcoin faithful have tried to not only convert people, but also convince them to martyr themselves, financially-speaking, for the crypto cause. It goes something like this. Hey, do you want to hear about the future? It's a digital currency called Bitcoin that lets you spend or move your money online without paying any fees. Sounds great. How does it do that? Well, Bitcoin saves you money by making transactions irreversible. So ... if I get scammed, I got scammed? There's nothing I can do about it? Yes. Okay, but is it at least easy to use? The thing is, I don't actually use it. I just hoard it. I'm waiting for some greater fools to push up the price by using theirs. Oh. Yeah. So you should buy some Bitcoins and use yours. I'll get back to you on that.

But Bitcoin is good for something other than redistributing wealth from one libertarian to another. That's transferring money, or anything else for that matter, online. "The design supports a tremendous variety of possible transaction types," Bitcoin's shadowy inventor Satoshi Nakamoto wrote back in 2010, including"escrow transactions, bonded contracts, third party arbitration, multi-party signature, etc." So anytime you needto send any kind of financial asset or agreement to somebody else, you can send it along with a Bitcoinand, through the beauty of the blockchain, avoid having to pay a lot of fees. That's why Wall Street banks are looking into whether they can build their own blockchains to cut costs before their competitors do. And while sending money is cheap within the U.S., it's not not across international bordersthe average transfer fee, according to the World Bank, is 7.5 percent. It's not hard to imagine, in other words, that Bitcoin could claim a big chunk of the $500 billion remittance market, although the difficulty of actually getting the physical cash to people in developing countries is still a significant hurdle.

Wait a minute, though. How does the blockchain cut costs again? Remember, instead of you paying the bank a fee to process a transaction, the Bitcoin system pays miners new coins to do so. Then these transactions get added to the list of all others in the public ledger, the blockchain. Butanytime it seems like you're getting something for nothing the costs are probably just being hidden. What are those costs? Well, Bitcoin mining is a pretty expensive business. Even the most specialized computers, which mine Bitcoins and only mine Bitcoins, require a lot of energy. So much so that Bitcoin miners have set up shop in far-flung places like Iceland where geothermal energy is cheap and Arctic air is cheaper stillfreefor them to run and cool off their machines at the lowest possible price.

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Bitcoin isnt the future of money its either a Ponzi ...