Transaction not yet indexed

521mcGRRw4aAcfkDXGL4QdLCrqZpbzeAAUZBFiwSApzPtyPGCfvJSa2zv28vPYoDKoECBzgkmukQGa2AxZK5sLCC

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