The price of Bitcoin has fallen below $40,000 (£28,210) for the first time in three months, after China imposed fresh curbs on crypto-currencies.
Beijing on Tuesday banned financial institutions and payment companies from providing services related to cryptocurrency transactions.
It also warned investors against speculative crypto trading.
It follows falls in Bitcoin of over 10% last week after carmaker Tesla said it would no longer accept the currency.
On Monday the crypto-currency was down 13%, while other digital coins such as Etheruem and Dogecoin lost as much as 18%.
Beijing cracks down
Crypto-currency trading has been illegal in China since 2019 in order to curb money laundering. But people are still able to trade in currencies like Bitcoin online which has concerned Beijing.
On Tuesday, three state-backed organisations, including the National Internet Finance Association of China, the China Banking Association and the Payment and Clearing Association of China issued a warning on social media.
They said consumers would have no protection if they were to incur any losses from crypto-currency investment transactions.
They added that recent wild swings in crypto-currency prices "seriously violate people's asset safety" and are disrupting the "normal economic and financial order".
Neil Wilson of Markets.com said: "China has for some time been putting pressure on the crypto space, but this marks an intensification - other countries might follow now as central banks make strides towards their own digital currencies.
"Until now western regulators have been pretty relaxed about Bitcoin, but this might change soon."
It comes In March, Tesla boss Elon Musk announced unexpectedly that the electric car maker would allow customers to buy cars using Bitcoin.
His electric car company Tesla made a profit of more than $900m (£646m) after buying $1.5bn worth of the cryptocurrency in early February.
But last week Mr Musk did a U-turn and suspended vehicle purchases using Bitcoin due to environmental concerns.
His fears centre on Bitcoin mining - the energy-intensive process through which the currency is generated using high powered computers. It often relies on electricity generated with fossil fuels, particularly coal.
"We are concerned about rapidly increasing use of fossil fuels for Bitcoin mining and transactions, especially coal, which has the worst emissions of any fuel," Mr Musk wrote.
"Cryptocurrency is a good idea... but this cannot come at great cost to the environment."
He said the electric carmaker did not intend to sell any of its Bitcoin and intended to reinstate crypto-currency transactions once mining shifted to using more sustainable energy sources.
Although the digital currency cannot be traded in China, more than 75% of Bitcoin mining around the world is done in China.
