Transaction not yet indexed

1521jpKYBHYN1a2ftvZaP6TEqYrcAmEFR8ce2v9fXpiUTjtkCjJXQ6gafYxaQp6JqbdVTmHRbDjyHVVQPyVoNvb

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