Then Bc is a Bitcoin clone!? Or is written from scratch?
Pure POS part was writen probably from scratch we don't have any other working coin without POW disabled.
Such starts like Nova/PPC/Mint all have POW part inside parallel to POS system.
Part is written from scratch, and the other part is copied from?
Look at source code.
I probably some parts like others was taken from BTC/LTC/PPC interface initial POW part.
Mostly main code is fresh. I dont have eny experience with git hub:
Here link for surce code:
https://github.com/rat4/blackcoin