Yes more than a decade- its been what has enabled Iran to survive the crippling sanctions imposed by US.
Since the war Iran has actually increased oil and gas exports and most of that will be destined for China although the war forcing USA to remove the sanctions on Iran oil exports has opened up vast new markets for Iran as well.
It looks like payment for tolls can be in yuan and and btc but lloydslist only confirm yuan payments to date.
This is a another nail in the coffin of the petrodollar and another step forward toward China setting the agenda in terms of global trade...after all China is the largest market for most of the gulf states energy exports and most of them have already joined BRICS and mBridge.