Transaction not yet indexed

521UaK3q9k4zWQL8fR6AD3EAYxFhLPnhzKofhhLkb9joH88ZNkaWRh15tfKx6EnARa8F9kTQi6A8mdLhJ6ohdLtj

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