// now for a pro-business blockchain
   class BusinessChain : public Bitcoin
   {
   public:
     void make_money(int how);
     enum how_to_make_money {
       by_printing_it;
       by_raising_its_value;
       by_predicting_its_value;
       by_predicting_its_value;
       by_making_a_new_blockchain;
       //still ridiculous when you're big by_working_for_it_yourself;
       //still ridiculous when you're big by_selling_things_yourself;
     }
   };