I’m currently helping out a friend of mine to regain access to her domain name, as the registrar has been unresponsive to emails and voicemails.
In this situation, if ICANN also finds that the registrar is unresponsive, they will in bulk transfer all the domains under that registrar to another one and provide access to all those who own the domains. Apparently, when one registers a domain, the registrar, per compliance rules of ICANN, needs to send the original registration data to a third party, with the actual name and contact information of the owner of the domain. So, that even if that domain owners information is protected, the third party has that data.
If you find yourself in a situation where your registrar has gone out of business and is unreachable or unresponsive, you can contact ICANN Global Support at (323) 405-3073, or their main number in the US at +1 (202) 570-7240 (in Washington D.C.), or find their contact at https://www.icann.org/resources/pages/customer-support-2015-06-22-en
I hope this helps.https://www.icann.org/resources/pages/customer-support-2015-06-22-en