Apex domains cannot have CNAME records.
Question and response
Question
dig pasty.com. NS
Answer
pasty.com. 5 NS ns1.pasty.net.
pasty.com. 5 NS ns2.pasty.net.
Authority
The response has no authority records.
Additional
ns1.pasty.net. 5 A 208.65.27.1
ns2.pasty.net. 5 A 199.38.28.20
ns1.pasty.net. 5 AAAA 2602:ffe0:1:0:0:0:0:3
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0