Customers on an exchange in Hong Kong accused them of Bitcoin Futures price manipulation.
OKEx, which operates one of the world’s most popular electronic venues for bitcoin trading, said it would cancel trades that occurred in a 90-minute period between 5 a.m. and 6.30 a.m. Hong Kong time Friday.
That was when the price of a bitcoin futures contract on OKEx fell sharply below bitcoin’s spot price—which, according to CoinDesk, was about $7,000 that day. The exchange didn’t state the futures price, but traders said it slumped to as low as $4,755 during that period.
see full article
https://www.wsj.com/articles/bitcoin-brouhaha-cryptocurrency-exchange-okex-denies-price-tampering-1522841694?mod=e2tw
