offer_assetis locked until the order is executed or canceled by the creator.
offer_assetlocked in this order is released and returned to the owner.
ask_asset - filled_asset_amounntin a specific order.
ask_assetto a specific limit order. Reduces the balance of the
offer_assetof the specified
order_id. If all outstanding
ask_assethas been filled, then the order is completed.