Very short week in term of work, nothing was conluent regarding the optimistic sync enhancement tests; I did try to implement the test case proposed by potuz but I can't find a way to make it works. Maybe I miss understoos something but when I add C while keeping B as the optimisitc head, it switchs to C… wnad do'nt want this. I will find a way but I need time to figure why it behaves like that.