How to withdraw Bancor from app?
you cannot do that yet. They were locked for 7 days.
Is this written somewhere in a SmartContract (if yes, can you point me there?) or is this just what you have heard somewhere?
I believ it was in the terms.
Hitbtc seems to be causing a stir with these iou (i owe you ) they are not BNT tokens they are iou tokens which represent Hitbtc's BNT that they bought in the ico. when the chain is live anyone with hitbtc iou will get the equivilant BNT in their trading account.