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Bitcoin plunged to a six-week low Tuesday after comments from South Korea's finance minister renewed worries about a crackdown in one of the largest markets for digital currency trading.
The Cboe and CME bitcoin futures contracts expiring later this month both dropped, with the Cboe contract falling 20 percent to around $11,010 and the CME contract off nearly 20 percent around $11,160 as of 4:01 p.m., ET. Trading in the Cboe bitcoin futures contract was briefly halted in accordance with price volatility rules.
South Korean Finance Minister Kim Dong-yeon said in a radio program interview that "the shutdown of virtual currency exchanges is still one of the options" the government has, according to an English-language report Tuesday from South Korea's Yonhap News.
Last week, it emerged that South Korea was reportedly moving to rein in speculative cryptocurrency trading with a potential bill to ban cryptocurrency trading. The country's government has since toned down its stance, and on Monday said it would only make a decision on how to move forward after "sufficient consultation and coordination of opinions."
Bitcoin dropped more than 19 percent to a low of $10,969.15 on Tuesday, its lowest since early December, according to CoinDesk. CoinDesk's bitcoin price index tracks prices from cryptocurrency exchanges Bitstamp, Coinbase, itBit and Bitfinex. As of 4:04 p.m. ET, bitcoin was trading more than 18.5 percent lower around $11,048, according to CoinDesk.
Trading in South Korean won accounted for about 3.5 percent of bitcoin trading volume, according to CryptoCompare. U.S. dollar-bitcoin trading had the largest share at nearly 42 percent, the website showed.
Bitcoin 3-month performance
Investors also monitored reports of an on the cryptocurrency market in China.
On Monday, Bloomberg reported that authorities in China were planning to block domestic access to Chinese and offshore cryptocurrency platforms that allow centralized trading. Regulators will also target people and companies that provide market-making, settlement and clearing services for centralized trading, the publication said, citing unnamed sources.
And on Tuesday, a Chinese central bank official reportedly said that authorities should ban the centralized trading of digital currencies, adding weight to concerns of further suppression of the country's cryptocurrency market.
Iqbal Gandham, U.K. managing director at eToro, said in an emailed comment: "The market is correcting off the back of news that China is moving to crack down on cryptocurrency trading. Chinese investors are likely spooked having heard the news and the market is on edge as a result."
"But we don't expect to see a major sell-off. Bitcoin in particular has gone through this cycle before ... Moreover, it you look at the last three years, January is typically the low point for cryptocurrencies. So this dip is not wholly unexpected," he added.
The digital asset soared to a record high of $19,343 last month, but has since been on a gradual decline. Futures contracts for bitcoin were introduced for the first time last month, with huge derivatives operators and the letting investors bet on price movements in the volatile asset for the first time.
"The pullback seems to be coming from a lack of buyers in Asia," Mati Greenspan, senior market analyst at eToro, told CNBC in an email.
"Japan and South Korea usually dominate this market but over the last few days, the volumes have been dropping steadily. This morning the combined volumes from these two countries dropped below 30 percent."
He added: "The Koreans and Japanese are used to paying a premium of 20 percent or more per coin. It seems they're getting wise and waiting for the market to even out before buying in again."
CoinMarketCap recently removed South Korean exchanges from its price calculations due the "extreme divergence" in prices compared to the rest of the world.
Reports of South Korea preparing a bill to ban cryptocurrency trading via exchanges last week sent the price of bitcoin and a number of other major digital currencies down dramatically.
"The reports are certainly not helping but in my assessment, the Asian market is simply tired of paying the premium," eToro's Greenspan said.
Charles Hayter, CEO of Crypto Compare, said that investors were likely profit-taking as they prepared for risks ahead.
"It seems like it is uncertainty spooking the markets to a degree with regulations unclear. Korea and Asia in general has been a strong support for the cryptocurrency markets adding users and demand with prices often trading at a premium," he said.