Is there some sort of highly entropic and massive hash string being constantly printed, recorded, and widely distributed so that one could see if any changes ha

Is there some sort of highly entropic and massive hash string being constantly printed, recorded, and widely distributed so that one could see if any changes happened in the past? Or rather, ensure, with a comparison, that the observer is still in the same timeline? Is there any similar data that can be used? Perhaps global weather records?