Transaction not yet indexed

668EEfUuusNAHdTcFAzvXtwwVCKv9PYf5CmqpyszBCygWjP719mEStfsQBfSLcSYWcN5X7ADqHe3hPJSF7wv1GiE

The transaction signature is valid but not yet indexed by this RPC node, or the transaction failed before inclusion.