public/subjects/blockchain/tracking-network

Tracking Network

We will create a network to track postal parcels using Hyperledger Fabric. Hyperledger Fabric is a modular blockchain framework. It revolves around a few key concepts. First, the notion of channel, which represents a network with a set of transactions and participants dedicated to the same business objective. Within a channel a transaction is validated by a set of designated peers. On this channel, Smart Contracts can be deployed as "chaincode" to define business logic that will control validation within this network.

Instruction

Network:

• Deploy a Hyperledger Fabric networks with one channel "PostalServices", two peers representing different cities ("Nairobi" and "Atlanta") belonging to the same organization and a third node "Singapore" belonging to another organization, an ordering node and two certificate authorities.

Objects:

• Define the following element of our postal network:
  • 'Parcels', of type assets, which include a destination (a string), a current address (a string) and a status
  • 'Transport' a transaction which allows the address of the parcel to be changed a package

Functionalities:

• Allow the creation of users, postal employees, that can create and modify parcels.
• Enable tracking of the status of the parcel: Good, Damaged or Destroyed. The state is saved in the package and a transaction allows this state to be modified. The transaction verifies that changes are consistent (state can go only one way... )
• Distribution, travel from the sorting center to the final address emits an event “Distribution”

Interface and deliverable

• Provide a README file and necessary script to allow the deployment of the network.
• Provide a command line interface with
  • create-user, a command to create a user
  • create-parcel a command to create a parcel
  • transport a command to modify the address of a parcel
  • change statusthat can potentially change its status.

Resources

-Hyperledger Fabric documentation -Chain code tutorials