Apex domains cannot have CNAME records.
Question and response
Question
dig tors.info. NS
Answer
tors.info. 5 NS ns2.tors.info.
tors.info. 5 NS ns1.tors.info.
Authority
The response has no authority records.
Additional
ns1.tors.info. 5 A 172.245.168.129
ns2.tors.info. 5 A 172.245.168.149
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0