code: def _derive_y_from_x(self, x, is_even):
          
          curve = ecdsa.SECP256k1.curve
          # The curve equation over F_p is:
          #   y^2 = x^3 + ax + b
          a, b, p = curve.a(), curve.b(), curve.p()
          alpha = (pow(x, 3, p) + a * x + b) % p
          beta = ecdsa.numbertheory.square_root_mod_prime(alpha, p)
          if (beta % 2) == is_even:
              beta = p - beta
          return beta
docs: Derive y point from x point