tarekka / bc_cdr_poc

Blockchain CDR Proof of Concept

Deploying the smart contract

The simplest way to deploy the smart contract is using remix online IDE. The contract code can be pasted in the IDE, built and deployed. Once deployed you will get a contract address to interact with.

Another alternative is to use the contract already deployed on the Goerili test net which can be found at the following address: 0xE4195f82FBcD436E228132e692Ac90ad867bC756

Starting the services

You need node installed to run the Producer and Verification service. Node can be installed by visiting the offical NodeJS website Please make sure to download the latest version to avoid facing issues.

Producer Service

Before starting the service, some environment variables need to be set. This can be done by creating an .env file in the ProducerService directory.

cd ProducerService
touch .env

The contents of the file should be like below:

PRIVATE_KEY=
HTTP_PROVIDER_URL=
CONTRACT_ADDRESS=0xE4195f82FBcD436E228132e692Ac90ad867bC756

The PRIVATE_KEY can be retrieved from your Web3 wallet. You can use Metamask extension to create a test wallet, then export the private key and paste it in the .env file To connect to the blockchain you'd need an HTTP provider. This can be set in HTTP_PROVIDER_URL. There are multiple HTTP providers available, you can use Infura for testing. The CONTRACT_ADDRESS can be left as is, except if you've deployed the contract to another address.

After the variables are set, the service can be started using node

node ProducerService.js

Verification Service

The same variables except the PRIVATE_KEY need to be set. The verification service expects two variables to start, the path to the input CSV file and the address of the sender that you're verifying from. A sample input file, input.csv is included in the VerificationService directory, and can be used. Since you typically want to verify records sent by the producer, the address to use here is the wallet's public address, which can be found in your Web3 wallet. However if you want to verify already existing records, you can use 0x143CE9C93e5F03e860FFEeDEf9D97F621104ad70

After the variables are set, the service can be started using node:

node VerificationService.js {path to input CSV file} {address of sender}

For example

node VerificationService.js input.csv 0x143CE9C93e5F03e860FFEeDEf9D97F621104ad70