when connecting via ssh root@[your.ip.address.here] discards - Host key verification failed . What could it be?
due to the fact that the impression ( fingerprint ) of the key, which the second party ( [your.ip.address.here] ) offers to encrypt data, does not coincide with the saved impression.
perhaps the change of the key by the second side is somehow connected with your actions - he added it to the security of the droplet itself . I have no idea what kind of “droplet” it is and what it may have for “security”, but if you are sure that it should have been like this, you can delete the previous saved impression:
$ ssh-keygen -R [your.ip.address.here]