BlockStarter 4.0 Final Project

The distributed database blockchain is drastically increasing popularity in software development and many other fields. In this report we present Blockstarter 4.0, a kickstarter-inspired project built upon the blockchain for the course Advanced Enterprise Computing at TU-Berlin, summer semester 2017. Blockstarter 4.0 consists of two parts, first one of a backend and smart contracts, and the second part (extension) handles projects with deadlines.

The first part, backend and smart contracts , has the following requirements: - allows project owners to withdraw funds when a project has been funded successfully (and not be able to withdraw if the funding goal has not been reached, yet) - allows backers to retrieve a share (token) for each project they invest in

In the second part we choose Projects with deadline : - A project has a deadline until which the funding goal must be reached. Otherwise, the project is automatically cancelled and all backers are refunded.

How to run it

• Go to project folder.

• Run the following command:

  docker-compose up --build

• Open your browser at the following link:

  your-docker-machine-ip:4000

Ho to test it

• To log in
  • It is only necessaray to specify a number from 0 to 9, this numebrs will be mapped to the related web.eth.accounts[] account.
• Create a project
  • Specify the number of available shares (in form of tokens)
  • Specify how much of them will be available

Api

Method	Route	Params	Description
GET	/api/v1/		Get Hello World
POST	/api/v1/projects	see below	Create a project
POST	/api/v1/projects/fund	- project - backer - amount	Fund a project
GET	/api/v1/projects		Get all projects
GET	/api/v1/projects/creator/:creator		Get all projects created by a creator
GET	/api/v1/projects/backer/:backer		Get all projects funded by a backer
GET	/api/v1/projects/status/:project		Show project status
GET	/api/v1/projects/:project		Show project information
POST	/api/v1/projects/withdraw	- project - creator - amount	Withdraw funds from the project
POST	/api/v1/projects/claim-shares	- project - backer - token	Claim project shares
POST	/api/v1/projects/show/shares	- project - backer	Show the shares owned by a backer

Create Project

Requst body:

{
    token: {
        initialSupply: 100, // number of shares
        tokenName: "Example Token",
        tokenSymbol: "Symbol",
        creator: "0x ..." // creator address
    },
    project: {
        title: "Example",
        description: "Frist Project With Token",
        goal: 100, // in ethers
        duration: 120, // in minutes
        sharesAvailable: 50, // number of tokens available (50 %)
        creator: "0x ..." // creator address
    }
}

Project extension

• A: kill a project when the time is up and the goal is not met.

Metodology

• Scrum (1 week iteration)

Tools

Technologies:

• Slack for communication
• GitLab for VCS
• Slack WebHook for commit notifications

Dev Tools:

• Server: Node.js
• Client: Angular.js