Expression of Concern: Blockchain and Federated Learning in Edge-Fog-Cloud Computing Environments for Smart Logistics. Mesopotamian Journal of CyberSecurity, [S. l.], v. 2026, n. 1, p. 12–12, 2026. DOI: 10.58496/2026/012. Disponível em: https://mesopotamian.press/journals/index.php/CyberSecurity/article/view/1036. Acesso em: 28 feb. 2026.