Permissioned Blockchain-Based Double-Layer Framework for Product Traceability System Ding, Qingyang ; Gao, Sheng ; Zhu, Jianming ; Yuan, Chongxuan Abstract Publication: IEEE Access Pub Date: 2020 DOI: 10.1109/ACCESS.2019.2962274 Bibcode: 2020IEEEA...8.6209D