The authenticity of host 'nn.nn.nn.nn (nn.nn.nn.nn)' can't be established.
ECDSA key fingerprint is SHA256:wls31bhGHFgGLYT403xsznbNS53Gzjlwrda5v7OUEZ4.
Are you sure you want to continue connecting (yes/no)?

Um. Wut?

This message always annoys me. I don’t like blindly accepting unknown connections.

From the root shell of my linode instance:

[root@lixxxx-xxx ssh]# ssh-keygen -l -f ssh_host_ecdsa_key
256 SHA256:wls31bhGHFgGLYT403xsznbNS53Gzjlwrda5v7OUEZ4 ssh_host_ecdsa_key.pub ()

Matches!

Now I’ll write this down so I can remember how to verify this next time.