keywords: privacy secret domain hidden
When you edit your domain contact details, there is a new option to enable domain privacy. The Privacy option hides the associated details (there is a separate privacy option for the registrant, admin contact and the technical contact) from the public "whois", which can be searched by anyone.
This is currently only available for individuals, and be aware that there are legitimate reasons for people to need the ability to contact a domain owner.
Enlighten domains recommends to not hide the technical contact, you may of course use Enlighten Domains as a proxy contact if that is suitable, and an "insert enlighten details" option is provided for convenience.
When enabling the option you will be asked to confirm that the domain is not used for business purposes.