Do you sequester 100% of customer funds?  If so, do you keep it all in Bitcoin at all times?

With the recent huge runup in the BTC price, I am worried that any site that doesn't both sequester customer funds and keep them 100% denominated in BTC is insolvent.  The behavior of Nitro with regards to Bitcoin Cash has me a bit suspicious.

Can you please confirm that customer funds are 100% sequestered and that they have been kept in BTC at all times?