pagito / marbles

IBM Blockchain - Marbles Demo

Marbles Demo

Application Background

Hold on to your hats everyone, this application is going to demonstrate transferring marbles between two users leveraging IBM Blockchain. We are going to do this in Node.js and a bit of GoLang. The backend of this application will be the GoLang code running in our blockchain network. The chaincode itself will create a marble by storing it to the chaincode state. The chaincode itself is able to store data as a string in a key/value pair setup. Thus we will stringify JSON objects to store more complex structures.

Attributes of a marble:

1. name (unique string, will be used as key)
1. color (string, css color names)
1. size (int, size in mm)
1. user (string)

We are going to create a Web UI that can set these values and pass them to the chaincode. Interacting with the chaincode is done with a HTTP REST call to a peer on the network. The ibc-js SDK will abstract the details of the REST calls away. This allow us to use dot notation to call our GoLang functions (such as chaincode.init_marble(args)).

Start the tutorials below to have your own marbles blockchain demo!

Tutorial / Documentation

• Looking for chaincode documentation? Check out the learn chaincode repo - start here!
• Tutorial for Marbles Part 1
• Tutorial for Marbles Part 2
• Documentation for IBM Blockchain IBC-JS SDK (our REST based SDK)

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Projects Contents

If you run marbles on local host you will have these two urls:

1. Marbles Part 1 - http://localhost:3000/p1
2. Marbles Part 2 - http://localhost:3000/p2

Privacy Notice

This web application includes code to track deployments to IBM Bluemix and other Cloud Foundry platforms. The following information is sent to a Deployment Tracker service on each deployment:

• Application Name (application_name)
• Space ID (space_id)
• Application Version (application_version)
• Application URIs (application_uris)

This data is used by IBM to track metrics around deployments of sample applications to IBM Bluemix to measure the usefulness of our examples, so that we can continuously improve the content we offer to you. Only deployments of sample applications that include code to ping the Deployment Tracker service will be tracked.

Deployment tracking can be disabled by deleting the 'Deployment Tracking' section in app.js.