1. A method comprising: receiving a signal associated with a two dimensional code, the two dimensional code being associated with a set of data having an associated version; determining a currentness status of the set of data using a version tree, the version tree comprising a set of versions of the set of data, wherein the currentness status is based in part on determining whether the associated version of the set of data is a temporally most recent version from the set of versions of the set of data, and wherein the temporally most recent version from the set of versions of the set of data represents the most recently published version of the set of data; generating a currentness signal based on the currentness status, wherein the currentness signal is associated with a set of currentness information derived from the currentness status, wherein the currentness information comprises a statement regarding currentness of the set of publication data; and transmitting the currentness signal.