code: func NewWalletPassphraseChangeCmd(oldPassphrase, newPassphrase string) *WalletPassphraseChangeCmd {
  	return &WalletPassphraseChangeCmd{
  		OldPassphrase: oldPassphrase,
  		NewPassphrase: newPassphrase,
  	}
  }
docs: // NewWalletPassphraseChangeCmd returns a new instance which can be used to
  // issue a walletpassphrasechange JSON-RPC command.