Authenticity - Confederate States of America $100

I just received a confederate $100 that I bought online, and I want to know how to verify it's authentic. It is VERY crisp for a bill from 1864, and feels like a crisp paper. It looks like a $100 bill from that era when I search the internet. Does anyone know of a sure fire way of telling if it is authentic or not?
I have scanned the below pictures out of its sleeve to avoid any shades of any sort. Any input would be appreciated.

There are so many fake Confederate States notes out there. I've always wanted one myself, but have been afraid to buy one that might not be legit.

One thing you could look for is the color of the signature. At that time, the ink had a heavy iron concentration. Over time, it oxidizes and turns brown.

I found some good articles to determine the authenticity of confederate money:

• http://manhattancoinclub.org/newsletter/ConfederateCurrency.pdf
  
• https://ourpastimes.com/tell-authentic-confederate-currency-5515865.html
  

I will be taking my confederate note to a local coin store where they actually sell old currency. Hopefully, they'll have their expert there at the time to verify it.

Looks real. I got a 10 dollar confederate bill myself. The easiest way to tell if its authentic is in the signatures. The ink they used during that time would turn a brownish color more less then a black color. And all bills were hand signed.