Dr.Ho-Kyung Yang, Dr.Hyun-Jong Cha, and Dr.You-Jin Song. “A Study on the Application of Blockchain Technology Based on Direct Acyclic Graph in IoT Environment”. Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 13 (July 10, 2021): 5898–5907. Accessed October 6, 2024. https://turcomat.org/index.php/turkbilmat/article/view/9861.