Transaction not yet indexed

521hamfwTkQFh1NUL9QMSTAfpqBkgw5WrU4qBKjrVwGhExSKWcdUSg74QraJDdUMP8X6VPPB48eAz5UjnpkA2rB1

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