Transaction not yet indexed

668UM8HdGiHbsLsUt3j6x48FXz1GMcTAdiJU5BquWfQG6dYJSZDhToDmrtQg8d1KThdSdHf3mfGE7wkYV6UXGpmM

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