So,how is possible ..when the diffic is low the RVN/BTC goes low..when the diffic is high...the rate goes high...seems some synchronization is there.
How the exchanges are linked to diffic level ? of RVN .
When diff is low, a lot of Nicehash hashing power comes in, mines more block per minute then usual which are sold at the exchanges. After the diff fix at the end of August this will be over.