Talking about audit and proof of reserves, the last audit from Huobi is dated from the first day of August, so it's not accurate to claim the 8th August that the balance has dropped from $700 to $90 million in a month and the Merkle Huobi tree hasn't been updated in a month. Personally, I don't understand and believe how $600 million USD can disappear in a couple of days. I hope they will publish a new audit soon though.


https://www.huobi.com/en-us/finance/merkle/