Transaction not yet indexed

MbNm5stCAkcrYVSUjQQLWyeS6PYSJJGo41wMW8sBALenDknPtJcn7zHE6ynUvD6KfJB5vFS4voJiMe8MkRgb2Qt

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