Confession: I've never been the least interested in Bitcoins or other cryptocurrencies... That is, until I joined Steemit.
Then I heard that it used the "block chain" (what is that?) and that instead of using computer power to "mine" cryptocurrencies, it used brain power.
I still don't understand that last part, but now, at least, I finally begin to understand cryptocurrencies. And I think I got the block chain, too. All thanks to a video I discovered today.
I hope it will be helpful for you too, if you (like me) didn't understand what it was all about.