Is my 10 year tourist visa legit?

I recently used the Chinese Visa Service Center to get a 10 year multiple entry tourist visa. I had researched the visa process thoroughly and everything made it seem like it would be a month long process. The customer service for the company even said it would take 30 days. I sent my materials overnight to them and they ended up getting it back to me in about 9 days. I was very relieved, but now I'm worried it was almost too quick. CVSC is legit, right? Are there ways to check if a visa is legit online or via an app?