2 steps folding 512bits to 256bits reduction using 64 bits digits. According to the document, I found out that this is not the secp256K1 algorithm. I want to implement GPU calculation in Python. Do you have any sample code?

I am not sure how you perform elliptic curve cryptography (ECC) calculations on a GPU as CUDA GPUs do not currently support 128-bit integers. Could you please explain your implementation, preferably with some code?