# Does there exist the method of projective coordinates for the computation of scalar multiplication for Koblitz curve?

Although the computation for scalar multiplications for Koblitz curve can be efficiently executed by TNAF method, but it still need to compute the multiplicative inverse for each point addition.

If your curve is additionally of the form $$y^2=x^3+b$$ further optimizations seem to be possible using a special case of Jacobian coordinates.