Document Verification using Sawtooth

Getting started

git clone https://github.com/Kerala-Blockchain-Academy/docver

sudo docker-compose up

The application should be available at http://localhost:4200

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DOCVER

Simple document verification example of a Sawtooth application.

Introduction

This is a minimal example of a Sawtooth application, with a javascript based transaction processor and angular based client. This example demonstrates a simple use case, where officials can register for birth/death, and generate a certificate which can then be reverified at any point of time in the future.

1. Register for birth/death certificate
2. Generate the certificate
3. Reverify the certificate at any point of time
4. Search the certificate at any point of time

All transactions have the same 6 hex digit prefix, which is the first 6 hex characters of the SHA-512 hash of "docver" (that is, "2690bc"). The docver is identified by with a corresponding public/private keypair. The transaction id of corresponding doccument is 70 hex digit address derived from:

• a 6-hex character prefix (the "docver" Transaction Family namespace) and
• a 58 bit hex characters of the SHA-512 that is calculated based on user data and
• a 6 bit based on type of certificate

Components

The project contains two parts :

I)Client Application ,written in Angular
II)Transaction Processor ,written in JavaScript

1. The client application consist of:

• angular application : contains the client application that can make transactions to the validator through REST API

The client container is built with Dockerfile.

2. The Transaction Processor in javascript.

TransactionProcessor is a generic class for communicating with a validator and routing transaction processing requests to a registered handler. index.js has the Transaction Processor class.

The handler class is application-dependent and contains the business logic for a particular family of transactions. DocVerHandler.js has the handler class.

The javascript transaction processor has the following files :

a)index.js (transaction processor class) b)package.json c)Dockerfile d)DocVerHandler.js (handler class)

Docker Usage

Prerequisites

This example uses docker-compose and Docker containers. If you do not have these installed please follow the instructions here: https://docs.docker.com/install/

NOTE

Any Linux distributions which support Docker should work.

Building Docker containers

Before starting the project make sure the Docker service is up and running.

To start up the environment, perform the following tasks:

a)Open a terminal window. b)Change your working directory to the same directory where you saved the Docker Compose file. c)Run the following command:

$sudo docker-compose up --build

The `docker-compose.yml` file creates a genesis block, which contain initial Sawtooth settings, generates Sawtooth, and starts the Validator, Settings TP, docVer TP, and REST API.

To stop the validator and destroy the containers, type ^c in the docker-compose window, wait for it to stop, then type

$sudo docker-compose down