yes, only then when k1 = k2
but what when k2 = curve.n - k1
?
r1 and r2 are the same
s1 and s2 are the same.
only k1 and k2 are like k1 != k2, and k2 = curve.n - k1
Your original question had no k2, r2, or s2!
s1*k1 - r1*x1 = z1
s1*k1 - r1*x1 = z2
The second equation was all 1's except for z2.