A flapper valve having a curved flapper and a seat, the flapper and seat each having complementary undulating and tapered perimeters, with sealing surfaces designed to maintain seal integrity under higher pressure, for a given outer diameter to inner diameter ratio, compared to prior art flapper valves. This architecture allows data to be stored across numerous pages without risking accidental erasure caused by crossing multiple erase blocks. A user’s intention can be commercial or non-commercial, with commercial intentions being informational or transactional. When the network-based robot transmits the separated image formats to the server, the original image is transmitted using the lossless method to improve the performance of the server.