I know the formula λ = (3 * x2^2) * (2 * y2)^-1 mod p and λ = (y₂ – y₁) * (x₂ – x₁)^-1 mod p, but in reality its values are corrected by the ecdsa library. Does anyone know how it works? Maybe there is a Python code that allows you to calculate the λ of any point with using ECDSA library? I mean “import ecdsa” in Python.The formulas of this library should not differ from the library in C++ (in openssl) I mean that the λ value cannot be taken directly by the formula (see above) from the coordinates of private key 1 (for example). x = 0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798 y = 0x483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8 But this value λ= 93198780379987365481681632241956844596827457411394035800182702812288411560889 How? I know ecdsa use another method.
