Update | Bitcoin value tumbles after BTC China exchange blocks renminbi deposits
BTC among first casualties, as value of the digital currency plummets after People's Bank of China orders third-party payment providers to stop using virtual money

Bitcoin prices have gone into freefall after Shanghai-based exchange BTC China yesterday blocked renminbi deposits, sparking a major global sell-off.

A continued crackdown on bitcoin trading on the mainland prompted unconfirmed reports last night that the People's Bank of China had been hit by a "retaliatory" denial-of-service attack after people experienced problems accessing the bank's website. The bank could not be reached for comment.
The Shanghai-based exchange is the world's biggest, accounting for 40 per cent of global bitcoin trading. The move to extend the crackdown is widely seen as an attempt by regulators to regain influence over the notoriously volatile virtual currency.
The crackdown comes just weeks after two US senate committees hailed the benefits of bitcoin and the US Justice Department said it could be used as a "legal means of exchange".
"We essentially got notice from our third-party payment provider that they will discontinue accepting payments for us and new deposits," BTC China CEO Bobby Lee said. "We're still operating a bitcoin exchange in China, legally, and we're still allowing people to deposit and withdraw bitcoin and withdraw renminbi."
Mainland investors rushed to sell off their rapidly depreciating bitcoin, which were changing hands for as little as 2,011 yuan (HK$2,566), a collapse of more than 70 per cent from a high of 7,588 yuan in November.