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.

The source codes in this repository is a platform of BBc-1 and bbc_core.py is the main process of a core node. The APIs of BBc-1 is defined in bbc_app.py and bbclib.py. So application developers should import them in your apps. For building a BBc-1 system, bbc1 package needs to be installed in the hosts and you need to run bbc_core.py on each host. In order to configure the BBc-1 network, the utilities in utils/ directory are available. They are a kind of BBc-1 application, so that you can develop your own management tools.

For the details, please read documents in docs/ directory. Not only documents but slide decks (PDF) explain the design of the BBc-1 and its implementation.

Documents

Some documents are available in docs/.

• Policy, design and analysis
  • BBc-trust.pdf
  • BBc-trust_ja.pdf
  • BBc-1_design_paper.pdf
  • BBc1_design_document_v1.0_ja.pdf
  • How_BBc1_works_v1.0.2_ja.pdf
• Usage
  • How_to_use_BBc1_v1.0.2_ja.pdf
  • BBc1_core_tutorial_installation_ja.md
  • how_to_use_in_nat_environment.md
  • libbbcsig_dll_build_for_Windows_x64_ja.md
• Programing
  • BBc1_programming_guide_v1.0_ja.md
  • BBc1_core_tutorial_file_proof_ja.md
• API reference (Coming soon. Currently, something wrong in building docs)
  • https://bbc-1.readthedocs.io/en/latest/
  • You can read API docs in your local host by the following command:

    cd docs/api/_build/html
    pipenv run python -m http.server

Environment

• Python

  • Python 3.5.0 or later
  • virtualenv is recommended
    • python -mvenv venv
  • In some environment, pipenv does not work well.
    • Some bugs seems to be in the installation scripts. So, please do not use pipenv now.

• tools for macOS by Homebrew

  brew install libtool automake python3 pipenv
  

• tools for Linux (Ubuntu 16.04 LTS)

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

Quick start

From source code in github

1. Install development 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 (in the case of python 3.6)

   python -mvenv venv
   source venv/bin/activate
   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 (should be initially at bbc1/ top directory)

   pipenv shell
   cd examples
   python file_proof.py arg1 arg2..
   

Use pip

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

   python -mvenv venv
   source venv/bin/activate
   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

• bbc1/core/
  • core functions of BBc-1
• utils/
  • BBc-1 system configuration utilities
• examples/
  • sample applications on BBc-1
• docker/
  • docker environments
• tests/
  • test codes for pytest
• libs/
  • some libraries used by BBc-1
• 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
• prepare.sh
  • setup script