Transaction not yet indexed

21C8MExU3DbaJSGBrnjbqLMn3Azcqpiu6hmJYN3uKpvxxFsifRGVSpzQTBHUUuLf8KNk76MkEUg8vCLHVG7DCWm6

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