Core system of BBc-1 (Beyond Blockchain One)

This project is a Python-based reference implementation of BBc-1, a trustable system of record keeping beyond blockchains.

The design paper (white paper) and the analysis paper are available here and here. BBc-1 is inspired from blockchain technologies like Bitcoin, Ethereum, Hyperledger projects, and so on. BBc-1 is a simple but reliable distributed ledger system in contrast with huge and complicated existing blockchain platforms. The heart of BBc-1 is the transaction data structure and the relationship among transactions, which forms a graph topology. A transaction should be signed by the players who are the stake holders of the deal. BBc-1 achieves data integrity and data transparency by the topology of transaction relationship and signatures on transactions. Simply put, BBc-1 does not have blocks, and therefore, requires neither mining nor native cryptocurrency. BBc-1 can be applied to both private/enterprise use and public use. BBc-1 has a concept of domain for determining a region of data management. Any networking implementation (like Kademlia for P2P topology management) can be applied for each domain. Although there are many TODOs in BBc-1, this reference implementation includes most of the concept of BBc-1 and would work in private/enterprise systems. When sophisticated P2P algorithms are ready, BBc-1 will be able to support public use cases.

Every directory includes README.md. Please read it for the details. Furthermore, directory docs/ includes documents and slide decks (PDF) that explain the design of the BBc-1 and its implementation.

Plan for v1.0

The next update will be a major version up to v1.0. However, the basic feature will be the same as v0.10. Re-design of package structure, updating documents and implementing admin tools are main task for v1.0.

Environment

• Python

  • Python 3.5.0 or later

• tools for macOS by Homebrew

  brew install libtool automake geth solidity pkg-config
  

• tools for Linux (Ubuntu 16.04 LTS)

  sudo apt-get install -y git tzdata openssh-server python3 python3-dev python3-venv libffi-dev net-tools autoconf automake libtool libssl-dev make
  

Quick start

Documents

Some documents are available in docs/.

• how_to_use_in_nat_environment.md

From source code in github

1. Install tools (libtool, automake)
2. Install python and pip
3. Clone this project
4. Prepare OpenSSL-based library in the root directory

   sh prepare.sh
   

5. Install dependencies by the following command.

   pip install -r requirements.txt
   

6. Start bbc_core.py on a terminal

   cd core
   python bbc_core.py
   

7. Start a sample app in another terminal

   cd examples
   python file_proof.py arg1 arg2..
   

Use pip

1. Install tools (libtool, automake)
2. Install python and pip
3. Install BBc1 by pip

   pip install bbc1
   

Use docker (See README.md in docker/)

0. Install docker on your host
1. Clone this project
2. Build docker image If you want source codes in your container,

   cd docker
   ./docker-bbc1.sh gitbuild
   

   or, if you just want to use BBc-1,

   cd docker
   ./docker-bbc1.sh pipbuild
   

3. Run a docker container

   ./docker-bbc1.sh start
   

4. Log in to the container

   ./docker-bbc1.sh shell
   

   or

   ssh -p 10022 root@localhost
   

   The initial password is "bbc1".

working directory

The working directory of BBc-1 on the docker container is mounted on docker/data/.bbc1/. You will find a config file, ledger DB and file storage directory in the working directory.

Files/Directories

• core/
  • core functions of BBc-1
• app/
  • SDK for applications using BBc-1
• common/
  • libraries and utilities for both core and app
• utils/
  • BBc-1 system configuration utilities
• examples/
  • sample applications on BBc-1
• docker/
  • docker environments
• tests/
  • test codes for pytest
• docs/
  • docs about BBc-1 and its reference implementation
• somewhere/.bbc1/
  • default working directory name of bbc_core.py
• requirements.txt
  • python modules to be required
• setup.py
• MANIFEST.in
• prepare.py
  • for creatign python modules