For me, my passive income is by doing my tasks to complete here in signature campaign. This is I think of as of now, since by joining here in any campaign will surely give an earning weekly or depends on the rules. Also, by buying and selling bitcoin were I also earn bitcoin.
I agree, the best way to have a passive income is by entering signature campaigns, although they dont give you a lot but still they are better than dumping your money into gambling or trading and then losing it all, but the best way to earn is by having a job, you have a skill you offer it for bitcoin.