I am trying to verify my domain ownership to Let's Encrypt by adding a TXT record to mydomain.zone located in /var/named. Let's Encrypt wants me to add it with a TTL of 1 second. However, I find no example on the web showing how a TTL can be added to this record. I simply use the following:
_acme-challenge.example.com IN TXT "sOmEWeiRedLoNgSTrInG"
Also in the beginning of the file inside the IN SOA ... definition I change the TTL from 3H to 1s but, still when I visit the Let's Encrypt specific URL to verify this challenge, I am shown "No TXT record found. Make sure to set your TTL to 1 second".
How can I add a TTL of 1 second to this TXT record?