How does ppsspp know if the sstate is not supported

[vsub_]

If the state is maded by other ppsspp version,you can't load the state because ppsspp is checking something in the file.

My question is what...is it certain address that contains value\text.
I'm asking because I'm making a saves manager with a lot of features

Edit:Hmm it does have the ppsspp version info but the bad thing is that it's not always on the same address which means I can't add such feature