Abstract. In article the author results the analytical analysis of analogies and differences between two dynamical technologies - relational databases and blockchainа. If the technology of relational databases was applied at construction of information systems of the electronic government, technology blockchainа rather new to digital economy being the new engine of the electronic government. The comparative analysis of these technologies on several parametres is carried out, are specified their strong and weaknesses. Primary factors on which the technology choice should be carried out, depending on the purposes of solved problems in digital economy are specified.