Transaction not yet indexed

a51Cu7PmqwSGLTkpSuDwoP6Bh4tY3dtcHRFsCMaFphkTXSFmVypeTnonexM8a9CF2oPk75bYmET2Ls6DJpBfrkp

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