Transaction not yet indexed

ack4MkEz4TngQvAr7cc7cFsGcXbFDHQGV7ciwgFbifiBvW2gHTPvwCZYGBaDzmHT2wdfotC1FockifpVViuRH1m

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