I guess you could call all optional technology for dead then, but it's super useful for things like ssh fingerprints (SSHFP), and I imagine they're also useful

I guess you could call all optional technology for dead then, but it's super useful for things like ssh fingerprints (SSHFP), and I imagine they're also useful for things like public keys for IPSec (IPSECKEY) and other types of certificates (CERT), like GPG public keys.