Why does it have to be a Crypto currency based business? I can think of plenty of businesses that you can fund that are not Crypto currency

related that would give you a passive income. You can buy existing businesses that are for sale and get an accountant to scrutinize the books and

then continue with that business. You do not even have to run the business yourself, you just hire a manager to do it on your behalf. It will take

some effort in the beginning to get a reliable manager and a good business opportunity, but after that it should be much easier. If you want, you

can convert the income back into Bitcoin, if you still want to be invested in Bitcoin.