If you are transferring a domain to Cloud DataWorks, all you need is your domain name Authorization Code (EPP key). Your transfer will be processed with no additional confirmation required.
If you are transferring a domain away from Cloud DataWorks, confirmation will depend on your new registrar. In most cases, a confirmation e-mail for your domain name transfer will be sent to the administrative e-mail address for your domain name.
You can find the valid administrative e-mail for your domain name by using the WHOIS lookup tool available at this link.