Xu's temporary detention and subsequent release closely coincides with the period that OKEx's unnamed key holder also became unavailable.
Caixin sources said Mingxing "Star" Xu had been taken by police at least a week ago and hasn't been seen since.
The founder of cryptocurrency exchange OKCoin has taken a step towards a reverse IPO with a $60 million acquisition in Hong Kong.
OKCoin founder Star Xu may be seeking a possible backdoor IPO by buying a majority stake in a Hong Kong-listed company.
Star Xu, the founder of Chinese crypto exchange OKCoin, is sparking controversy with remarks his firm may be open to working with the government.
Two of bitcoin's biggest names, Roger Ver and exchange OKCoin, are engaged in a dispute over the Bitcoin.com domain, amid accusations over contracts.
CoinDesk speaks to OKCoin CEO Star Xu about his leading BTC/CNY exchange's new push to promote "real bitcoin use" in China and abroad.
China's bitcoin industry stepped out over the weekend with two large gala events for exchanges OKCoin and Huobi.
Excessive price speculation and investor risk may have caused central bank clampdown, say Chinese exchange CEOs.
Bitcoin exchange OKCoin has announced the suspension of its P2P margin trading services as part of a site upgrade.
Five Chinese exchanges will not attend this weekend's Global Bitcoin Summit in Beijing due to recent central bank actions.
Bitcoin prices sank under $403 after several Chinese exchanges made public announcements on their sites.
News of a Chinese government bank ban has hit bitcoin markets, though exchanges say there's no official announcement.
Early-stage investor Rui Ma talks to CEO Star Xu on his company's bid for global domination, Beijing style.
OKCoin, the exchange claiming to be China's largest by trading volume, has announced a $10m Series A funding round.