Transaction

{
  "register_key": {
    "key_id": 1,
    "password_protected": true,
    "pubkey": "ZXXoqHJro4opLgPj2IMxtZlEt0ajicCSmiJMzNxATkk=",
    "scheme": "x25519-xchacha20poly1305-v1"
  }
}