Fenitra , R. and Matio , R.H. 2026. Main Title: Adaptive Cognitive Q-Learning–Based Security Model for Blockchain Protocols: Simulation and Experimental Evaluation on a Private Ethereum Network. INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY. 26, (Jan. 2026), 1–7. DOI:https://doi.org/10.24297/ijct.v26i.9836.