Methods for computer generation of graphical user interfaces are disclosed. The interfaces may provide representations of electronic order book data, including prospective orders and the impact of the prospective orders on the order book. Generating the graphical user interfaces can comprise calculating cumulative digital asset purchase order volumes and cumulative digital asset sell order volumes that are available in the order book at each order price. Graphical representations of a prospective order and a post-order order book may be generated and overlaid on the current order book graphical representation.