Ctrip sent a text message indicating that the booking was interrupted, and there was a link because the identity was not verified. Is it a fraudulent text message?

No, since March 1, the Railway Bureau has implemented a new real-name registration system ticket purchase policy: passengers who purchase tickets through the Internet must check their identity information through the website 12306. If they receive the short message of "identity check of online ticket purchase failed", it means that the submitted passenger information failed to pass the identity check of the website 12306, and the online ticket purchase failed. It is recommended to go to the train station or the sales point to buy tickets, check your identity information, and you can buy tickets online normally next time.