Chain-of-Blocks

Our Final Work of Cryptocurrencies and Blockchain Technology. A mini coin (using SM2 & SM3) based on Python.

Environment

macOS Mojave 10.14.4

$ python -V
Python 2.7.17
$ mysql -V
mysql  Ver 14.14 Distrib 5.7.28, for osx10.14 (x86_64) using  EditLine wrapper

Import my data

Data is in init.sql (containing three users).

Username	Password
admin	admin123
alice	123456
bob	123456

Create database chain and source the .sql file:

$ mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1733
Server version: 5.7.28 Homebrew

Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> DROP DATABASE IF EXISTS chain;
Query OK, 0 rows affected (0.00 sec)

mysql> CREATE DATABASE chain;
Query OK, 1 row affected (0.00 sec)

mysql> USE chain;
Database changed
mysql> source setup.sql
Query OK, 0 rows affected (0.00 sec)
...
Query OK, 0 rows affected (0.00 sec)

mysql>

How to start on your own system

Set your db configs in config.py.

$ cat config.py
#!/usr/bin/env python

db_host = 'localhost'
db_user = 'root'
db_pass = 'root'

Run init.py to init system.

$ ./init.py
Hello admin! Here is your key pair!
[*] pk = ***
[*] sk = ***
Shh! Here is your password!
[!] passwd = ********
Now start creating genesis block!
Success with nonce ***
Hash is ***
=== Wallet interface ===
choose an option:
1.create a tx
2.start mining
3.get balance
4.exit
choose:

Run client.py to register other users:

$ ./client.py
=== Welcome to C-moon coin system ===
login or register new account:
1.login
2.register
3.exit
choose:

TODO

• P2SH (now is P2PKH)
• Miner's fee
• GUI
• P2P
• Change password