func (s *PublicTransactionPoolAPI) GetRawTransactionByBlockHashAndIndex(ctx context.Context, blockHash common.Hash, index hexutil.Uint) hexutil.Bytes {
    if block, _ := s.b.BlockByHash(ctx, blockHash); block != nil {
        return newRPCRawTransactionFromBlockIndex(block, uint64(index))
    }
    return nil