Is there source code available for this?
Sorry for late answer, it's done with Electrum, Pycoin, Pybtctools and Blockchain.info API, as I didn't have much space to install Bitcoin Core.
But I don't think I will publish the source
you dount publish code, but write address of your service with warning
i smell scam try
for example, i write a simple mixer use bitmixer.io api and i publish the code.. this is the way