An efficient blockchain-based resource allocation and secure data storage model using Fire Hawk Optimization and entropy in health tourism. - Seyedeh Somayeh Fateminasab; Nastaran Evaznia; Saeideh Memarian; María del Carmen Romero Ternero; Gloria Miró-Amarante; Seyed Reza Kamel Tabbakh (J. Cloud Comput., 2025)