Store an SSH public key on your account so it can be installed on a VPS at create or reinstall time.Send a single-line OpenSSH public key (ssh-rsa, ssh-dss, ssh-ed25519 or ecdsa-sha2-nistp256/384/521). Never send a private key. A key you already stored is rejected as a duplicate, matched on its SHA256 fingerprint.Adding a key does not touch machines that are already running; it is applied the next time a VPS is created or reinstalled.