Immaniar, D., Azizah, N. ., Supriyanti, D. ., Septiani, N. . and Hardini, M. . (2021) “PoTS: Proof of Tunnel Signature for Certificate Based on Blockchain Technology”, International Journal of Cyber ​​and IT Service Management (IJCITSM), 1(1), pp. 101–114. doi: 10.34306/ijcitsm.v1i1.28.