Transaction not yet indexed

51i21Tr5fAKk8rPUfdHSpYhKgNbqdkGRsWw9FWUajvGDz2JSF5FSqC4XddFHiDjWGXe5mW9s7dB5WpHzRa4C9pnk

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