It looks like he's been trying to get Merit
from the day he joined, and he did earn 75 Merit in a short time. It could also be he doesn't know plagiarism isn't allowed on Bitcointalk, he doesn't look like the standard signature spammer. I'll send him a message.
Thank you very much for trusting me, I am definitely not active in bitcointalk for bounty. I reviewed my previous post. It does have similarities with the post pointed out by icopress.
The DSA content I posted was not copied directly from the link he pointed out.As I said in the article, I am not a native English speaker. It is still difficult for me to read articles in pure English.
My purpose in posting this post is to hope that others can point me out mistakes so that I can learn better. But unfortunately this is suspected of plagiarism.I won't make the same mistake again in the future. About technical posts, I will read more and less reply.
I found the previous manuscript. I do have a step-by-step verification.

I am also trying to learn programming knowledge to better understand everything about Bitcoin.
Thanks again to everyone who helped me correct my mistakes!