Investing.com - Cryptocurrency prices dipped suddenly on Thursday, with Bitcoin slumping below the $4,000 mark.
Bitcoin fell 6.5% to $3,745.60 on the Investing.com Index, as of 8:16 AM ET (13:16 GMT).
Cryptocurrencies overall were lower, with the total coin market capitalization at $127 billion at the time of writing, compared to $137 billion on Wednesday.
Ethereum, or Ether, slumped 15.3% to $130, as the coin remained under pressure after sustaining an attack earlier this week, in which some computers falsified transactions.
Litecoin was at $33.78, down 15.2%, while XRP slipped 6.7% to $0.33765.
Meanwhile in China, blockchain platforms are now required to censor content and allow authorities to access data and user identity, the Cyberspace Administration of China ruled on Thursday.
Companies in violation of the rules could be subject to fines or prosecution. The rules are meant to "advance the industry's healthy and orderly development,” the agency said.
China has curbed the sell of digital currencies on the mainland since 2017, including initial coin offerings.
In other news, Thailand’s financial regulators have granted working licenses to three crypto trading companies and one crypto broker-dealer, the country’s Securities and Exchange Commission said in a statement. Two firms were rejected, while the SEC is still considering another application.
Crypto licensing rules in Thailand require companies to gain approval from the SEC before they can operate.
-- Reuters contributed to this report.