Transaction not yet indexed

521bqcKbcFEAGArT7XLCW8y7VfV5gUeUe27iUFFwR86JFwHV2SxfaxqEG2kPPGvwaMVSmVY6yztwUKqJFsARuu9o

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