@dexizer7799
Thank you but I think this is an example for different type of curve... I do not know I did not understand the content of that link

for small secp256k1 I found that if you do addition of all X values for all points and do mod p you get 0

So if P=97 I get n=79

if I do the addition of all valid points Gx+2Gx+3Gx+4Gx....+78Gx Where Generator point is P   (1,69) then I get
3880 mod 97 = 0

Maybe this can be usefull