Apex domains cannot have CNAME records.
Question and response
Question
dig everscale-cloud.com. NS
Answer
everscale-cloud.com. 5 NS ns01.everscale-dns.com.
everscale-cloud.com. 5 NS ns04.everscale-dns.de.
everscale-cloud.com. 5 NS ns03.everscale-dns.de.
everscale-cloud.com. 5 NS ns02.everscale-dns.com.
Authority
The response has no authority records.
Additional
ns01.everscale-dns.com. 5 A 185.136.96.77
ns02.everscale-dns.com. 5 A 185.136.97.77
ns03.everscale-dns.de. 5 A 185.136.98.77
ns04.everscale-dns.de. 5 A 185.136.99.77
ns01.everscale-dns.com. 5 AAAA 2a06:fb00:1:0:0:0:1:77
ns02.everscale-dns.com. 5 AAAA 2a06:fb00:1:0:0:0:2:77
ns03.everscale-dns.de. 5 AAAA 2a06:fb00:1:0:0:0:3:77
ns04.everscale-dns.de. 5 AAAA 2a06:fb00:1:0:0:0:4:77
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0