Apex domains cannot have CNAME records.
Question and response
Question
dig silkroad.com. NS
Answer
silkroad.com. 4 NS ns-872.awsdns-45.net.
silkroad.com. 4 NS ns-1161.awsdns-17.org.
silkroad.com. 4 NS ns-1905.awsdns-46.co.uk.
silkroad.com. 4 NS ns-425.awsdns-53.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0