SSH host key fingerprint
The TTYper SSH server presents an Ed25519 host key with this SHA-256 fingerprint:
SHA256:nVaf2d7tAgv2AZsOJE46xjsOA8TA3uXAFy/vcQ7TM3g
Compare it with what your SSH client prints on the first connection. If it differs, do not continue and tell us.
To check from a terminal that has the key in known_hosts: ssh-keygen -l -F ttyper.com.