Meme Okex admet des manipulations sur les futures :
https://ambcrypto.com/price-manipulation-of-bitcoin-btc-okex-announces-rollback-of-futures-contract-data/a number of users performed unusual transactions to manipulate the price of BTC’s quarterly futures contract on March 30th, 2018, making it deviate sizeably from the BTC index. The OKEx team’s investigation revealed that users had closed huge amounts of positions at market price without considering its cost causing it to drop to unusually low levels.
Par contre, ils ont decide de revenir sur les transactions douteuses jusqu'a hier 5H.
OKEx has announced that to protect the interests of all its users, all future transactions will be rollbacked to 5:00 March 30th, 2018 (HongKong time).