Transaction not yet indexed

668mtnacSFCLSU87CCbFyzEL9mpETxvGByEDHcVZMTPM7zkqxcurX18ZVCp6FdEZF9U6ktwJyGNxLX2bPQ8FHkRG

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