The question of the authenticity of the Anonymous Iskander (Natanzi) reports has a deep historiography. Most researchers implicitly accept messages Anonymous on faith, without investigating the time of sputannosti genealogy and chronology of Anonymous and the cause of other errors such as the confusion with a White and Blue Horde and the descendants of the Golden Horde Temnik Nogay, who supposedly ruled in the East district. A minority of researchers questioned the credibility of reports about the Natanzy Ordu origin of Urus-Khan, not focusing on other contentious moments of Natanzy. Shamiloglu and Gayev A.G. give a sharp estimate Natanzy as a completely unreliable source. Based on the analysis of communications Natanzy. The question of the credibility of Natanzy reports has a deep theory.
The work "Anonymous Iskander" was written in 816 Ah (1413-1414) and dedicated to Timurid Iskandar. At the moment, five variants of this manuscript are known. Having examined this source, we can summarize that in the dispute about the reliability of the information of Natanzi were more right supporters of the low degree of reliability of Natanzi on the history of ulus Jochi from 1313 to 1370 years