K. Anju Aravind, B. Ravindra Naik, Ch. Siva Chennarao1. (2022). Combined Digital Signature with SHA Hashing Technique-based Secure System: An Application of Blockchain using IoT. Turkish Journal of Computer and Mathematics Education (TURCOMAT), 13(03), 402–418. https://doi.org/10.17762/turcomat.v13i03.13008