Quoting from [Safe Trading Admin]:

Alibaba.com Sign-in Seal is a unique message or image that you select to help protect your account from phishing websites.

After creating a Sign-in Seal for your computer, you can be sure you're on the legitimate Alibaba.com site each time you sign in to Alibaba.com using your computer. Simply check whether the customised text or image is displayed on the Alibaba.com webpage. If it's not there, you may have signed in to a fake Alibaba.com site. 

Go to your Sign-in page, click "Prevent Password Theft" at the top of the Sign-in box and create an individuation Sign-in seal right now!

 For more infomation about Alibaba.com Sign-in Seal, please visit here.

thats not true.a sign in seal does in no way show or prove a company is not a crook.

the best way to do it is to research the company you are thinking of doing business with.

alibabas web site contains more scam artist than any other web site i have ever delt with.