func (s *PublicTransactionPoolAPI) GetRawTransactionByBlockNumberAndIndex(ctx context.Context, blockNr rpc.BlockNumber, index hexutil.Uint) hexutil.Bytes {
    if block, _ := s.b.BlockByNumber(ctx, blockNr); block != nil {
        return newRPCRawTransactionFromBlockIndex(block, uint64(index))
    }
    return nil