TY CONF TI APPROACH TO ASSESSING THE INITIAL SUSTAINABILITY LEVEL OF A BLOCKCHAIN SYSTEM FOR SMART CONTRACTS KW blockchain system parameters KW direct expert assessment KW sustainability level KW technology KW consensus JO CHALLENGING ISSUES IN SYSTEMS MODELING AND PROCESSES AU Krivonogov, A.A. AU Starodubov, K.V. AU Prokofyev, A.V. AU Gromov, Y.Y. PY 2025 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov