Does CEX.IO require SSN?

Hello there, I'm curious about CEX.IO's registration process and was wondering if they require Social Security Numbers (SSN) from their users. As a cryptocurrency enthusiast and investor, I'm always looking for secure and trustworthy platforms to conduct my transactions. Could you please clarify if providing an SSN is a mandatory step in setting up an account with CEX.IO, or if there are alternative verification methods available? Your insight would be greatly appreciated. Thank you!