Abstract: Some embodiments relate to systems, stored computer-readable program instruction and methods for precious metal reserve management in a precious metal digital asset trading network implemented by a precious metal reserve management server. An example method includes: determining by the reserve management server a total digital precious metal value corresponding to issued precious metal digital assets in the precious metal digital asset trading network; determining by the reserve management server, a total reserve precious metal value based on reserve precious metal inventory data, wherein the precious metal inventory data relates to precious metal inventory stored in one or more physical locations; and generating by the reserve management server, a first transaction signal to purchase precious metal in response to the total reserve precious metal value being less than the total digital precious metal value.

Abstract: A method for guiding a device in a required direction along the interior of a pipe, the method comprising removably mounting the device on a curved guide, lowering the device and the guide through a hole bored in the wall of the pipe to gain access to the interior of the pipe with the guide arranged to curve in the required direction in which the device is to move along the pipe and moving the device off the guide in the required direction.

Abstract: A method for guiding a motor driven wheeled device in a required direction along the interior of a pipe comprises providing the device with a guard, lowering the device with the guard leading through a hole bored in the wall of the pipe to gain access to the interior of the pipe, causing the guard to engage the internal wall of the pipe and position the device on its wheels facing in the required direction and then starting the motor to cause the wheels to rotate and move the device in the required direction.