Bitcoin's sell-off deepened on Friday, putting the digital token at the lowest level since May, after it dropped below yet another key support level.

The world's most-traded cryptocurrency declined as much as 11 per cent to US$6,798 (NZ$10,596), before trimming losses. Alternative coins such as Ether and Litecoin also slumped. For the first time since April, Bitcoin fell below its 200-day moving average without bouncing back, a signal that traders see the breach as a sign of weakness rather than an opportunity to buy.

READ MORE:
Bitcoin breaches US$8,000 level as March slump accelerates
Bitcoin expected to rise by 22% in 2019
Bitcoin's 'death cross' could spell doom for crypto investors
Pros ditching the bitcoin market - JPMorgan

Feeding the anxiety were lingering concerns about the status of exchanges such as Binance Holdings Ltd. in China after officials there formally announced a crackdown on crypto-related businesses. Binance has denied reports of a police raid of offices in Shanghai, saying it doesn't have formal operations there as of now.

Advertisement

"There's been a general apathy in the market, and low sentiment," said Mati Greenspan, the ex-senior market analyst at eToro in Tel Aviv. "There was excitement when Xi Jinping said China needed to embrace blockchain, but it has faded and the market is returning to levels before" the Chinese president's comments in late October, he said.

Technicals have a big role in powering trades for virtual tokens because they lack the kind of fundamentals that can be analyzed with traditional securities. Many investors say the tokens have little intrinsic value beyond the anonymity some seek for illegal financial transactions.

"Crypto traders get awfully superstitious about technical indicators, like momentum," said Greenspan, who set up his own research outfit this week. The relative-strength index, which measures the velocity of a security's price movement, is a technical signal of momentum.

Rumours also persist that firms who mint new Bitcoins, known as miners, have been selling into the downdraft, Greenspan and others said.

Bitcoin was 3.6 per cent lower at $7,328 as of 3:20 p.m. in New York. It's down 13 per cent this week.