Composer is a framework to accelerate the development of applications built on the top of Blockchain platform such as Hyperledger Fabric.Here we have complete information about Composer and Playground for more information please visit our youtube channel https://www.youtube.com/edit?o=U&video_id=EvICyArbFSs www.rihusoft.com

1. Hyperledger Composer

2. Hyperledger Tools
Set of collaboration tools for building blockchain networks that make it simple and quick
for development.
 Hyperledger Composer
 Composer is a tool for building blockchain business networks, It used to create
smart contracts and blockchain applications to solve business problems.
 Hyperledger Explorer
 Explorer is a tool which provides a dashboard viewing information about
transactions ,blocks and smart contracts available on the network.
 Hyperledger Cello
 Cello can build up a Blockchain as a Service (BaaS) platform quickly from the
scratch. It reduce the effort required for creating, managing and terminating
blockchains.

3. Smart Contract :- computer protocol intended to facilate, verify or enforce the
negotiation or performance of contract
Mining :- Adding transactions to the ledger
Peers :- Each node (a computer connected to the network) is called peer
Endorser :-Peer will simulate the transaction and ensure that the outcome is both
deterministic and stable
Committer :-The peer will validate the integrity of a transaction and then append to
the ledger.
Endorsement policy:- Instruct a peer on how to decide whether a transaction is
properly endorsed
Transactions:- Transactions are submitted by a participant to affect the assets held in
the asset registries on the Hyperledger blockchain
Consensus:- An agreement made between peers or organizations
Quick Notes

4. HyperLedger Composer
 Composer is a framework to accelerate the development of applications built on the
top of Blockchain platform such as Hyperledger Fabric
 Start from the business level :model network assets, participants & transactions
 Build Applications that use API's to invoke transactions, that create, update &delete
 Assets are transfer between participants
 Assets, participants ,transactions are recorded on Blockchain registries
 Can easily integrate blockchain with existing business processes & system records
 Modelling language: The Hyperledger Composer modelling language is used in the
business network definition to describe the assets, participants, and transactions in
the business network

5. Hyperledger Composer

6. HyperLedger Composer Benfits

7. Asserts :- Assets are tangible or intangible goods, services, or property, and are stored
in registries.
Participants :- Participants are members of a business network. They may own assets
and submit transactions.
Peers :- Each node (a computer connected to the network) is called peer
Transactions :-Transactions are the mechanism by which participants interact with
assets, i.e transferring ownership of the asset from participant to
participant
Queries :-Queries are used to return data about the blockchain world-state. Queries are
defined within a business network
Events:- Once events have been defined, they can be emitted by transaction processor
functions to indicate to external systems that something of importance has
happened to the ledger
Terminology

8. Prerequisites:
 Operating Systems: Ubuntu Linux 14.04 / 16.04 LTS (both 64-bit), or Mac OS 10.12
 Docker Engine: Version 17.03 or higher
 Docker-Compose: Version 1.8 or higher
 Node: 8.9 or higher (note version 9 is not supported)
 npm: v5.x
 git: 2.9.x or higher
 composer-cli
 Yeoman generator
 composer-rest-server

9. Developing Business from Composer
 Creating business network with model,java Script and permission.acl files
 Next generate the business network archieve file with .bna extension
 Install composer run time for our business network with peer admin card
 Start the composer network and deploy bna file
 Import the network administrator identity card
 To check that the business network has been deployed successfully or not we
can just ping the business network
 To create the REST API run the “composer-rest-server” from terminal
 For tutorial “https://youtu.be/EvICyArbFSs”

10. HyperLedger Composer Rest API
After creating composer rest server for our business network we can access the API from localhost
3000 port and we can do transaction from API and also the data will store in Couchdb

11. Couchdb
We can access couchdb at localhost 5984 port ,all transaction done from rest api and playground
Will store in couchdb in the form of documents with unique id

12. Composer Playground
 The Hyperledger Composer Playground provides a user interface for the
configuration, deployment and testing of a business network
 Without development environment setup we can still develop business network by
playground
 In playground we can create or import network.bna file to generate or develop
business network
 Playground mainly deals with assets, participants and transactions
 If we do anything in the business network that will be save in transaction history
which cannot be change
 Define tab:- Define tab we can define and work with model for your business network
 Test tab:-can create assets and participants that were defined in the Define tab, and
test the functionality of your business network..

13. Developing Business network in playground
 Click Deploy a new business network
 Click empty-business-network then Deploy the Business network
 To connect to our business network click Connect now under our business
network card.
 Then add model file,script file and Access control file
 Click Update to deploy the changes to our business network
 Click the Test tab to test our Business network
 The first thing we should add to our business network is to add participants
and assests.
 Click the Submit Transaction button to submit our transactions
 We can see all transactions in our business network by Click All Transactions

14. HyperLedger-Composer PlayGround

15. HyperLedger-Composer PlayGround
These are all different id cards for different participants in the business network.By clicking
Connect now on card we can connect to business network by that participant id

16. Deploying a business network to Hyperledger Fabric for a
single organization
Step-1 : Setup the development environment.
- https://hyperledger.github.io/composer/unstable/installing/development-tools.html
Step-2 : Build and start a Hyperledger Fabric network.
- http://hyperledger-fabric.readthedocs.io/en/release/build_network.html
Step-3 : Setup configuration tools cryptogen and configtxgen.
Step-4 : Create a connection profile use to connect with the Fabric network.
Step-5 : Locate the certificate and private key for the administrator.

17. Step-6 : Create a business network card that contains all of the information required to
connect to the business network. i.e, It includes Connection profile, Private key and
Certificate.
Step-7 : Import the business network card for the Hyperledger Fabric administrator.
Step-8 : Install Composer runtime onto all of the Hyperledger Fabric peer nodes,
this is nothing but a chaincode install operation. Here we specify the name of the
blockchain business network.
Step-9 : Start the blockchain business network, this is chaincode instantiate operation.
Step-10 : Import the business network card for the business network administrator.
Step-11 : Check that the business network has been deployed successfully.
Step-12: Generate a REST API based on the business network.

18. References
 https://hyperledger.github.io/composer/playground/playground-index.html
 https://hyperledger.github.io/composer/tutorials/deploy-to-fabric-multi-org.html
 https://hyperledger.github.io/composer/tutorials/developer-tutorial
 https://github.com/hyperledger/cello/blob/master/docs/terminology.md
 http://hyperledger.org/
 https://www.youtube.com/edit?o=U&video_id=EvICyArbFSs

19. Thank You...