SHANGHAI (Reuters) – A hacker claims to have stolen the personal data of a billion Chinese citizens held by Shanghai police in what could be one of the largest data breaches in history if the information was confirmed. This anonymous Internet user, hidden behind the pseudonym ChinaDan, published last week on the specialized forum Breach Forum an offer to sell more than 23 terabytes (TB) of data for ten bitcoins, or just under 200,000 euros. “In 2022, the Shanghai National Police database was leaked,” the post said. “The database contains information on one billion Chinese residents and several billion items…