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Bitcoin, the best known of hundreds of 'virtual' coins, slumped Tuesday to a six-week low below $12,000 as analysts blamed a rush by various jurisdictions to regulate the sector.

The final weeks of last year were marked by bitcoin mania as the unit topped $20,000, but it lost some 20 percent in Tuesday trading which saw most of its fellow crypto-currencies similarly wilt.

“Bitcoin has dropped below $12,000, a level not seen since early December.

The crypto-currency has fallen nearly 40 percent since its all-time high,” noted David Madden, market analyst with CMC Markets.

According to crypto exchange coinmarketcap.com, other major virtual currencies ethereum, ripple and bitcoin cash, a clone which split from the original last year, posted double-digit losses by early afternoon.

“Explaining moves in bitcoin is always tricky but this plunge ... may well be a result of recent signs that regulatory pressures are building,” said Neil Wilson, analyst for ETX Capital, as several countries, notably China and South Korea, target a crackdown.

Last week saw prices sag after the South Korean government said it was planning to ban crypto-currency exchanges — though it later backtracked — while Justice Minister Park Sang-Ki said Seoul was preparing a bill to shut down the country's virtual coin exchanges to slam the brakes on a craze which “has started to resemble gambling and speculation.”

South Korea is a hotbed for crypto-currency trading, accounting for some 20 percent of global bitcoin transactions, while much of the “mining” — computerised creation — of the coin units is undertaken in China.

“South Korea holds some of the world's largest crypto-currency exchanges, so a ban is expected to disrupt Bitcoin trading,” said a note from British consultancy Capital Economics, which also alluded to Chinese concerns of bitcoins's effect on financial stability.

Lukman Otunuga, research analyst at FXTM forex forecaster, also blamed the market jitters on the political regulatory backdrop surrounding the sector, which topped $600 billion in market capitalisation in mid-December.

“Bitcoin was the talk across financial markets for all the wrong reasons on Tuesday, after prices tumbled sharply to their weakest level since early December,” said Otunuga, noting talk of tighter regulation “has effectively eroded investor appetite for bitcoin.

“With reports on a renewed crackdown on the crypto-currency in China fueling anxiety over future restrictions, further losses could be on the cards in the near term,” added Otunuga, noting the latest wild ride in value “should remind investors on how explosively volatile and unpredictable” crypto-currencies can be.

"One has to ask if Bitcoin is currently in the process of flickering violently before it burns out?"