func handleConn(conn net.Conn) {

	defer conn.Close()

	io.WriteString(conn, "Enter a new BPM:")

	scanner := bufio.NewScanner(conn)

	// take in BPM from stdin and add it to blockchain after conducting necessary validation
	go func() {
		for scanner.Scan() {
			bpm, err := strconv.Atoi(scanner.Text())
			if err != nil {
				log.Printf("%v not a number: %v", scanner.Text(), err)
				continue
			}
			newBlock, err := generateBlock(Blockchain[len(Blockchain)-1], bpm)
			if err != nil {
				log.Println(err)
				continue
			}
			if isBlockValid(newBlock, Blockchain[len(Blockchain)-1]) {
				newBlockchain := append(Blockchain, newBlock)
				replaceChain(newBlockchain)
			}

			bcServer <- Blockchain
			io.WriteString(conn, "\nEnter a new BPM:")
		}
	}()

	// simulate receiving broadcast
	go func() {
		for {
			time.Sleep(30 * time.Second)
			output, err := json.Marshal(Blockchain)
			if err != nil {
				log.Fatal(err)
			}
			io.WriteString(conn, string(output))
		}
	}()

	for _ = range bcServer {
		spew.Dump(Blockchain)
	}

}