This document proposes a methodo­logical approach to the formation of TTE for legally significant transboundary electronic document (ED) exchange. The basic thesis is that the appearance of the problem to ensure the trust in transboundary ED exchange flow does not lead to the formation of a new sphere of social relations. Modifications are required only with respect to the type of interaction between the subjects of law. Earlier it was a physical interaction with paper documents, it is now a virtual interaction with ED.