Plagiarism is taking someone else's work and passing it off as your own.
Just give credit to the original author and highlight what you're changing IMO.
That's a nice idea. I just have to mention the sources I used right ? Complete reference should appear in the reference list at the end of the paper ? Because I was offered some rewriting services here on the forum and all of them are using paraphrasing tools.. So most likely I will follow your suggestion. Thanks.
You should probably do a bit of research about properly citing reference sources. If all your doing is explaining POW mining give the man that created it the credit with a source and move on.