code: func ListPrivateKeys(ctx context.Context, c *cli.Context) error {
  	if err := initCrypto(); err != nil {
  		return action.ExitError(ctx, action.ExitUnknown, err, "failed to init XC")
  	}
  
  	kl, err := crypto.ListPrivateKeyIDs(ctx)
  	if err != nil {
  		return action.ExitError(ctx, action.ExitUnknown, err, "failed to list private keys")
  	}
  
  	out.Print(ctx, "XC Private Keys:")
  	for _, key := range kl {
  		out.Print(ctx, "%s - %s", key, crypto.FormatKey(ctx, key))
  	}
  
  	return nil
  }
docs: // ListPrivateKeys list the XC private keys