Transaction not yet indexed

668gdEwGQAWEKgB8h5RprEpJbrdd4xsa4EMkUFPVgjBfbadaqPT6pGk7b6vbQkvXdyY2CRSDEVdBSM8T3NTTzek8

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