In this paper, the author proposed a new model to capture the security of ECDSA called EC-GGM(elliptic curve generic group model). But we know that there is already some idealized models for capturing the security of ECDSA, including GGM and the bijective random oracle model (BROM) [http://library.usc.edu.ph/ACM/SIGSAC%202017/ccs/p1651.pdf]. But the author did not compare these two models. May I ask if there is any advantage to EC-GGM over BROM?