Compatible sha256d version ?

[Morgiver]

Hi ! I've just test the script and it's working perfectly !
I have a question, is the script compatbile sha256d version ? i know the bitcoin use sha256d but i can't tell if your script use it.

If it doesn't, it would really help if you integrated the "d" version of sha256 to make the script compatible with Bitcoin

ps: sorry for my bad english, it's not my natural language