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.
Those are ways to earn bitcoin but those aren't passive income. Signature campaign requires you to be active in this forum and post stuffs. The only way signature campaign is a passive income is when you're maintaining a thread (i.e. buy and sell thread), and you still get paid for those little posts. Otherwise, it's not a passive income. Buying and selling isn't passive income as well since you have to advertise, talk to people, and have a deal. Only time buying and selling is a passive income is when you're using a bot to both buy and sell which is quite hard to do for the buy part.