A hacker has claimed to have procured a trove of personal information from the Shanghai police on one billion Chinese citizens, which tech experts say, if true, would be one of the biggest data breaches in history.

The anonymous internet user, identified as "ChinaDan", posted on hacker forum Breach Forums last week offering to sell the more than 23 terabytes (TB) of data for 10 bitcoin, equivalent to about A$287,431.

Hacker claims to have stolen 1 billion records of Chinese citizens comes via ChinaTechNews.com.