A method of providing a gift registry service over a distributed network of computers. Analysis of traffic logs may be performed and a host tracking graph may be generated that shows hosts and their bindings to IP addresses over time. The tube is stretched in a longitudinal dimension, which reduces the tube in a radial dimension and causes the intraluminal prosthesis to radially compress. Digital content items received from content sources and broadcast information can each be de-duplicated at the content clearinghouse server. The devices disclosed may be used in numerous industrial, process, and medical flow system applications for normalization of flow sensors and to derive other properties of a fluid.