Blockchain and Secure Element, a Hybrid Approach for Secure Energy Smart Meter Gateways[J] SENSORS 2022(22) Zakaret, Carine Peladarinos, Nikolaos Cheimaras, Vasileios Tserepas, Efthymios Papageorgas, Panagiotis Aillerie, Michel Piromalis, Dimitrios Agavanakis, Kyriakos