What is cryptocurrency?
Cryptocurrency is a form of payment that can be exchanged online for goods and services. Many companies have issued their own currencies, often called tokens, and these can be traded specifically for the good or service that the company provides. Think of them as you would arcade tokens or casino chips. You’ll need to exchange real currency for the cryptocurrency to access the good or service.
Cryptocurrencies work using a technology called blockchain. Blockchain is a decentralized technology spread across many computers that manages and records transactions. Part of the appeal of this technology is its security.
Cryptocurrency is a kind of digital currency that is intended to act as a medium of exchange. Cryptocurrency has become popular in the last decade, in particular, with Bitcoin becoming the most widely tracked alternative currency. Typically, cryptocurrency is electronic-only and does not have a physical form – that graphic at the top of the page is just an artist’s vision of digital currency.
Cryptocurrency appeals to many people because of its ability to be managed without a central bank and therefore concerns around secrecy and subterfuge. It appeals because of its ability to hold value and not be inflated away by central banks that want to print money. It’s also very difficult to counterfeit due to the blockchain ledger system that manages the currency.
Here’s what cryptocurrency is, how it works and the significant drawbacks to its use.
How cryptocurrency works
Cryptocurrencies are produced, tracked and managed through what’s called a distributed ledger such as blockchain. In a distributed ledger, the currency’s movement is processed by computers in a decentralized network, to ensure the integrity of the financial data and ownership of the cryptocurrency. Think of it like a giant never-ending receipt of all the system’s transactions that is being constantly verified by everyone who can see the receipt.
This decentralized system is typical of many cryptocurrencies, which eschew a central authority. That’s part of the appeal of cryptocurrencies such as Bitcoin – it keeps governments and central banks out of the currency system, reducing their interference and political maneuvering.
To this end, in some cryptocurrencies, the number of units of currency is limited. In the case of Bitcoin, the system is organized so that no more than 21 million bitcoins can be issued.
But how exactly does cryptocurrency come to exist? The key way is through what’s called mining, to use a metaphor related to the old monetary system based on gold or silver. Powerful computers, often known as miners, perform calculations and process transactions on the ledger. By doing so, they earn a unit of the currency, or at least a part of a unit. It requires a lot of expensive processing power and often a lot of electricity to perform these calculations.
Owners of the currency may store it in a cryptocurrency wallet, a computer app that allows them to spend or receive the currency. To make a transaction, users need a “key,” which allows them to write in the public ledger, noting the transfer of the money. This key may be tied to a specific person, but that person’s name is not immediately tied to the transaction.
So part of the appeal of cryptocurrency for many is that it can be used somewhat anonymously.
There’s literally no limit to the number of cryptocurrencies that could be created. The range of them is astonishing, and literally thousands of currencies popped up in the last few years, especially as Bitcoin soared into mainstream popularity in 2017. Some of the most popular cryptos include Bitcoin, Litecoin, Ethereum, Ripple and Tether. Even Facebook has been trying to get in on the cryptocurrency game by establishing a consortium of industry partners.
How many cryptocurrencies are there? What are they worth?
More than 6,700 different cryptocurrencies are traded publicly, according to CoinMarketCap.com, a market research website. And cryptocurrencies continue to proliferate, raising money through initial coin offerings, or ICOs. The total value of all cryptocurrencies on Jan. 27, 2021, was more than $897.3 billion, according to CoinMarketCap, and the total value of all bitcoins, the most popular digital currency, was pegged at about $563.8 billion.
The drawbacks of cryptocurrency
While proponents have a good story to tell about digital currencies such as Bitcoin, these currencies are not without serious drawbacks, at least as currently configured. That doesn’t mean you can’t make money on it by selling it to someone else at a higher price than you paid. However, these drawbacks do make it virtually useless as a currency, a means of exchange.
Bitcoin and other cryptos have real detractors, including some of the world’s top investors, such as multi-billionaire Warren Buffett. Buffett has called Bitcoin “probably rat poison squared,” while his longtime business partner Charlie Munger has said cryptocurrency trading is “just dementia.”
Why are cryptocurrencies so popular?
Cryptocurrencies appeal to their supporters for a variety of reasons. Here are some of the most popular:
Other supporters like the technology behind cryptocurrencies, the blockchain, because it’s a decentralized processing and recording system and can be more secure than traditional payment systems
Mining the currency is expensive and polluting
One 2019 study in technology journal Joule concluded that Bitcoin mining produced enough carbon emissions in 2018 to rank it between the countries of Jordan and Sri Lanka. Researchers from MIT and the Technical University of Munich concluded that Bitcoin mining alone accounted for 0.2 percent of global electricity consumption. Add in the effects from other cryptos and electricity usage more than doubled.
Are cryptocurrencies a good investment?
Cryptocurrencies may go up in value, but many investors see them as mere speculations, not real investments. The reason? Just like real currencies, cryptocurrencies generate no cash flow, so for you to profit, someone has to pay more for the currency than you did.
That’s what’s called “the greater fool” theory of investment. Contrast that to a well-managed business, which increases its value over time by growing the profitability and cash flow of the operation.
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For those who see cryptocurrencies such as bitcoin as the currency of the future, it should be noted that a currency needs stability.”
As NerdWallet writers have noted, cryptocurrencies such as Bitcoin may not be that safe, and some notable voices in the investment community have advised would-be investors to steer clear of them. Of particular note, legendary investor Warren Buffett compared Bitcoin to paper checks: “It's a very effective way of transmitting money and you can do it anonymously and all that. A check is a way of transmitting money too. Are checks worth a whole lot of money? Just because they can transmit money?"
For those who see cryptocurrencies such as Bitcoin as the currency of the future, it should be noted that a currency needs stability so that merchants and consumers can determine what a fair price is for goods. Bitcoin and other cryptocurrencies have been anything but stable through much of their history. For example, while Bitcoin traded at close to $20,000 in December 2017, its value then dropped to as low as about $3,200 a year later. By December 2020, it was trading at record levels again.
Are cryptocurrencies legal?
There’s no question that they’re legal in the United States, though China has essentially banned their use, and ultimately whether they’re legal depends on each individual country. Also be sure to consider how to protect yourself from fraudsters who see cryptocurrencies as an opportunity to bilk investors. As always, buyer beware.
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