Real estate registry using Hyperledger fabric

Setting up frontend

In the project directory, in the client just run npm install.
It will install the node modules and run the react application
Then run npm start
Open http://localhost:3000 to view it in your browser.

Setting up backend and Hyperledger fabric

1. Firstly setup the hyperledger fabric using fabric samples repository. To do so in your windows please refer this link

2. After setting up hyperledger fabric for the first time stop using ./network.sh up to start the network/ Instead follow the steps mentioned next./ Type cd fabric-samples/test-network in terminal (WSL Ubuntu terminal) to test-network subdirectory within your local clone of the fabric-samples repository./ Then ./network.sh down** Then type ./network.sh up createChannel -c mychannel -ca to start the network and create the channel/

   Before this step please complete step 3 first.

   Then type ./network.sh deployCC -ccn basic -ccp ../asset-transfer-basic/chaincode-javascript/ -ccl javascript to deploy the chaincode on our hyperledger network/

   Then open a new terminal and type cd asset-transfer-basic/application-javascript/ Install required node modules using npm i/ Then type node app.js to start the server side application./

   If you get no error during these steps then you nodejs app integrated with hyperledger fabric should be up and running on port 5000.

   Please refer to this link for any issues in Step 2.

3. In your fabric-samples repository change asset-transfer-basic directory with the directory provided in this repository (or you can just change the different files).

4. Steps 1 and 3 have to done only once however step 2 (including sub steps) has to carried out every time

About

API endpoints

http://localhost:5000/getAllAssets [get]: returns all the records stored in blockchain.
http://localhost:5000/getAsset/{id} [get]: returns a record by its id
http://localhost:5000/updateAsset/{id} [patch]: update values of a record
http://localhost:5000/createAsset [post]: create a record on the blockchain
http://localhost:5000/transferAsset [patch]: transfers the ownership of the asset
http://localhost:5000/assetExsists [get]: checks if the record is the present on the blockchain

Chaincode (Land ) Schema has four attributes here

Id: String
Appraised value: String
BorderCoordinates: 2D array
Owner Names: String

Example body to be used during sending post request

{
"id":"asset600",
"borderCoordinates":
[
[19.121322965264117, 72.83067047595979],
[19.124890242729872, 72.83884584903718],
[19.12140883106099, 72.83829867839815]
],
"owner":"George",
"appraisedValue":"20000"
}

Refiner

There is also a great data query tool connected with both frontend and backend which syncs with hyperleder fabric periodically,fetches its data and stores it in a relational database and allows us to perform rich relational queries on hyperledger data which is not possible with SDK interfaces

To set it up refer to this link.