Bitcoin and the world of cryptocurrencies, explained

First things first: What is a cryptocurrency? In short, they are digital currencies that are protected by cryptography (a method of safeguarding information through complex codes). This encryption makes them incredibly secure and almost impossible to counterfeit or double-spend. Most cryptocurrencies work using a new technology called blockchain, a decentralized technology that's spread across many computers.

As stated above, blockchains are a new form of technology that records information. Termed distributed ledger technology, these blockchains keep records across a large number of computers (rather than on a single computer server), grouping the data in sequential blocks. Once locked into place, these blocks cannot be changed or altered, meaning that records of who mined a currency or spent it are never called into question, and cryptocurrencies can never be stolen the way a credit card can.

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No. By their very definition, Bitcoin and other cryptocurrencies are completely democratic and aren’t overseen by a central authority in the way that the U.S. dollar is. A true peer-to-peer payment network, cryptocurrencies can only work if all participants use the same software and abide by the same rules. This provides a strong incentive for a consensus to be maintained, or else Bitcoin will cease to have any value and all users will lose their cryptocurrency wealth.

The interesting thing about cryptocurrencies, and bitcoin, in particular, is that they are largely self-perpetuating (with the exception of the genesis block). New bitcoins are mined (or minted) by being the first person to correctly verify one megabyte of existing bitcoin transactions. This is incredibly time-consuming work that involves a lot of computation power, but these days it is not the only way to obtain bitcoin. Bitcoin can also be bought or earned by doing things like publishing an article on a website that pays via cryptocurrency.

Yes, and no. In 2021, much of what cryptocurrencies are is more theoretical than practical, which is further demonstrated by their purchasing power—or lack thereof. While bitcoin can and has been used to buy real things (you can use a third-party app called Purse to use bitcoin to buy items on Amazon), you certainly can't just walk into a grocery store and buy a gallon of milk with a bitcoin or two. In fact, even apps like Purse or PayPal, which allow purchases to be made with bitcoin, convert the cryptocurrency into fiat money before making the transaction, so you aren't technically spending that bitcoin or Dogecoin, but rather its legal tender value.

So if you can’t spend a bitcoin or unit of cryptocurrency, why were they invented? The answer may lie in the text of the genesis block of Bitcoin, which reads: “The Times 03/Jan/2009 Chancellor on brink of second bailout for banks.” (Alluding to a headline from The London Times.) This seems to imply that the founder had a lack of faith in the banking system and was looking for an alternative way to store and protect their wealth, as well as wanting to disrupt the control of the money supply and empower the individual when it came to their finances.

Bitcoin is widely considered to be the world’s first cryptocurrency. Yet, despite having existed for just over a decade, no one actually knows who founded it. The original Bitcoin whitepaper thate outlines how the currency works was published by Satoshi Nakamoto, the same person who mined the first bitcoin block, but the individual’s (or group of individuals’) identity remains a mystery. There are dozens of theories out there about who they are, but none have been definitively proven, making this a Holy Grail-level mystery of our time.

Financial pundits aren’t yet convinced that Bitcoin, or similar cryptocurrencies, will replace the dollar, pound, or yen in any real way. However, as a scientific and technological innovation, cryptocurrencies are massively important. In particular, the blockchain system that governs most of these currencies has the power to change the future. Blockchain allows us to move information securely and authentically and can be adapted for things like voting, maintaining inventory records, and identifying exploited labor practices.

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The number of cryptocurrencies is always growing, so it can be difficult to pin down an exact count, but as of April 2021, there were over 10,000 different types of cryptocurrency. This includes coins, like bitcoin and Dogecoin, as well as tokens, which represent a tradable asset or utility (like 10 hours of free streaming on a service or a certain number of loyalty points from a company).

Almost every discussion of cryptocurrency winds its way to Elon Musk, so how does he fit in with all of this, exactly? Only as an ardent supporter of and believer in cryptocurrencies, really. Many have theorized Musk is actually Nakamoto (he's not) or the mastermind behind Dogecoin (that would be Jackson Palmer), but really, Musk is simply one of the most outspoken tech leaders on the topic. Both of his companies, Tesla and SpaceX, are heavily invested in cryptocurrency and have engaged with the idea of accepting them as cash-equivalent payments for goods and services, but aside from that, Musk is no more special in the development or growth of these cryptocurrencies than you or me.