Transaction not yet indexed

521aBUFyQR7Ba1MPgZaTw1Tqy7arGEr1HFjp3osDe2Zqym79aSDk7AxpZDs4gGiNkZVZDkr2iLAfJUtCxEjvH7wa

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