I had a program called BOINC which allows donating spare computational resources on your computer to scientific research projects, like SETI, climate predictions, medicine and many more.
Then I discovered a cryptocurrency designed for rewarding BOINC users, called Gridcoin. It was the first cryptocurrency I used and when I got my first mining rewards I started to trade and participate in giveaways and airdrops for other coins.
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That's blockchain technology's utility at its best.
Efficiency and value-addition.