Transaction not yet indexed

521vYbAeRUGoTsZZd6TYUu842eAmp61wC8i5WvHkpfESBeoekFft5CL4FnSNGPRz4PHyQJLmU1mZhdHFRdCTYPok

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