Apex domains cannot have CNAME records.
Question and response
Question
dig BLIND.ORG. NS
Answer
BLIND.ORG. 1 NS pdns02.domaincontrol.com.
BLIND.ORG. 1 NS pdns01.domaincontrol.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0