Blockchain-Assisted Transformer CNN Framework with Optimal Feature Selection for Real-Time Digital Payment Fraud Detection. - Himani Fnu; Mahamood Hussain Mirza; Mahatma Reddy Marri; Sangeeta Singh; Nitin Kumar 027; Dominic Majak Deng Adol; Rania M. Ghoniem; Ruby Pant; Salil Bharany (Int. J. Comput. Intell. Syst., 2026)