If you are looking for passive income generation, you should look for staking coins.

NEO allow you to stake their coins to generate GAS which you can sell.

There are many other staking coins out there too. And Ethereum is also moving to POS in 2018, so that would also

allow you to generate passive income.


You could also run a masternode in coins that support this feature and be able to earn coins passively in running a masternode but the cost of doing so is getting exorbitant...