Does the entire mining process have to participate in automatic buying and selling transactions? Is it not possible to mine alone without selling?
The buyer of CredaCash gets the mining rewards. So it is possible to mine by only buying CredaCash, without selling it. The script does wash trading using the "trade" exchange request, which is equivalent to offsetting buy and sell requests. This could easily be changed to use the "buy" exchange request, which would result in only buying CredaCash. (The specific line that would need to be changed in exchange-mine.py currently reads "submit_xreq(s, 'trade', ..." The word 'trade' would need to be changed to 'buy'.)