Transaction not yet indexed

5X21mdsjfNBsffYDBMruZqC5uvZqKxK8zbtpe9m18A2vLGV7VC1XxKXiQ2gKrY5sK6GmpU8sQyy6bYLsC2a4cG9U

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