Transaction not yet indexed

668RfNjcbSKTiSYXHzDN65ny2ApbPYUU9iKqtercsfP3Ah8mtzPb1LfQuoWEgz6HK66DnmLrT8QpW91RqKNNjqpY

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