Cloud Mining Websites
There are a lot of scam cloud mining sites out there, so be careful and remember to look for proofs on the Verifications page.
Just a quick reminder: avoid any cloud mining site that promises or guarantees any kind of fixed daily profit. Mining is a randomized process, so it is impossible to guarantee anything.
Highly advertised site that offers multiple special offers and bonus airdrops.
Dualmine has undergone a lot of changes since I first started using it, but overall I'm still quite satisfied with the services provided. One of the newest additions is the Bitcoin+ contract, which allows users to mine BTC at a reduced rate from the standard contract, but with guaranteed profit and no minimum withdrawal amount. It is worth noting that this is also the only contract that allows users to withdraw in a currency other than Dualmine's native token, Cryptonits. That said, users can freely convert mined profits and even mining contracts from and to any crypto Dualmine offers except Bitcoin+ contracts. The only drawback to Dualmine that I can think of is that, as of today (02/12/2021), the maximum withdrawal amount for CRT is 3000 and withdrawals cannot be made more frequently than 10 days from the completion of the previous withdrawal.
Reasonably profitable cloud mining site with a free trial period
I've looked at a lot of cloud mining websites. A LOT. Most of them are either scams that demand you pay a fee to withdraw your funds and never deliver the goods, or they are legitimate mining sites but their maintenance fees are so high you end up losing money daily. Hashshiny is different. Available via web browser and Android app, Hashshiny offers new users a free 300-Gh/s contract with an additional 3 Th/s for the first three days. Maintenance fees are based on your total hashrate in that mining protocol (which crypto you are mining) and are deducted from daily mining profits, meaning you don't have to pay anything out-of-pocket. Mining profits can also be automatically reinvested in additional hashrate, allowing users to increase their profits over time and earn even more without ever paying a thing. Mining continues even when you are not on the site/app. Finally, Hashshiny offers hashrate in several cryptocurrencies, allowing users to choose the most profitable coin to mine using their built-in calculator (calculated profits do not account for maintenance fees, so be mindful and do your own math, too).
Fair, feasible crypto mining for mobile users
It would take me a long time to explain this, so I'll just leave the link for their "white paper" here, https://minepi.com/white-paper. It's not hard to use the Pi app and you only have to come back once a day to restart the mining, so it certainly falls into what I see as ideal passive income. When you download the app using the link above, enter "strike8echo" without quotes as your invitation code.
Pi is not a fully operational blockchain yet. It currently has no value. As they point out, this was true of Bitcoin not so long ago.
Use protein folding simulation client to earn BAN
Have you ever wanted to do something practical to help fight and cure disease? This is your chance. Banano Miner uses the Folding@Home client (which you can download here) to help researchers perform protein folding simulations in order to develop treatments for various nasty, horrible, terrible, not good very bad illnesses. In exchange for your CPU and GPU power, you will be rewarded in points that will be exchanged at variable rates for Banano (BAN). It doesn't pay much, but you'll be doing good things for people who are suffering vicious maladies and praying daily for a solution.