A Comparative Analysis of Blockchain Architecture and its Applications: Problems and Recommendations Ali Syed, Toqeer ; Alzahrani, Ali ; Jan, Salman ; Siddiqui, Muhammad Shoaib ; Nadeem, Adnan ; Alghamdi, Turki Abstract Publication: IEEE Access Pub Date: 2019 DOI: 10.1109/ACCESS.2019.2957660 Bibcode: 2019IEEEA...7q6838A