Transaction not yet indexed

4Sz21ttbRb1ZBZFHpNyDU6ErdF6rfCh917PdP2D8qeqGHePkV9HfMxUhGNkCgurAzjEMXtmq64ZytHTPAoKGY57F

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