![Bitcoin plunges—now down 47 percent from December peak [Updated]](https://cdn.arstechnica.net/wp-content/uploads/2018/01/Screen-Shot-2018-01-16-at-1.38.12-PM-800x540.png)
Bitcoin's value plunged on Tuesday, falling to $10,300—the lowest value the virtual currency has seen in 2018. Bitcoin's value is down almost 25 percent over the last 24 hours, and down 47 percent from December's all-time high of around $19,500.
Bitcoin's fall was part of a broader crypto-currency selloff. Every major cryptocurrency has suffered double-digit losses over the last 24 hours, according to CoinMarketCap. Ethereum is down 28 percent. Bitcoin Cash is down 31 percent. Litecoin is down 29 percent, while Dash is down 24 percent, and Monero is down 30 percent.
It's hard to say what causes cryptocurrencies to go up or down on any given day. In recent months, Bitcoin and other cryptocurrencies have exhibited classic signs of a speculative bubble, with millions of ordinary investors flooding into the market in hopes of making an easy buck. That helped to push Bitcoin to new heights, but it also heightened the cryptocurrency's already significant volatility.
As a result, it has become common for particular cryptocurrencies to get "hot" and see their value soar for no apparent reason. It also means that crashes can become self-perpetuating, as inexperienced investors react by panic-selling, pushing the value down further.
We've also seen market euphoria spread to the mainstream stock market. An iced tea company, a Hooters franchisee, and Kodak have all seen their stock soar after announcing blockchain initiatives.
While Bitcoin is down 47 percent from its December peak, Ethereum is still on an upward trajectory since the start of the year. The price of ether, Ethereum's currency, rose from $750 at the start of 2018 to a high of $1,400 over the weekend. The current price of $950 is down from that Saturday high but still above its value at any point prior to this year.
UPDATE 4:41pm ET: This story has been updated to reflect changes in prices that occurred since the story was published earlier today.
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Bitcoin rose to a peak of $19,500 in December before falling below $11,000 on Tuesday.
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Ethereum, Bitcoin's top competitor, is focused on smart contracts—computer programs that execute on the blockchain. It has seen a big rise over the last few months.
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Bitcoin Cash is a fork that split off from the main Bitcoin chain in August. It features larger blocks and (as a result) less congestion and dramatically lower transaction fees.
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Litecoin is one of bitcoin's oldest competitors, having been started in 2013. It is similar to Bitcoin, but blocks are created every 2.5 minutes, compared to 10 minutes for bitcoin.
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Dash is a privacy-focused cryptocurrency that's also known for having a more collaborative, less fractious culture than bitcoin.
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Monero is another privacy-focused cryptocurrency.
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Bitcoin Gold is a fork of bitcoin that's built around an alternative mining algorithm called Equihash. Equihash is designed to be resistant to mining by customized chips, allowing anyone to mine it on a home PC.
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Ethereum Classic is a fork of Ethereum that emerged after controversy over the DAO, a virtual organization that raised $150 million in ether before it was hacked and much of the ether was stolen. The mainstream Ethereum community rolled back these transactions to restore the stolen ether, but a dissident faction carried on a version of Ethereum blockchain that included the thefts, believing that the irreversibility of transactions should be a core Ethereum feature.
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ZCash is another privacy-focused cryptocurrency that uses zero-knowledge proofs to provide anonymity.
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