"Bitcoin has dropped below $12,000, a level not seen since early December. The cryptocurrency 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 cryptocurrency 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 cryptocurrency 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.
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 cryptocurrency 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" cryptocurrencies can be. "One has to ask if Bitcoin is currently in the process of flickering violently before it burns out?"
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)