Blockchain - Introduction and Authoring Smart Contracts

1
Vikas Grover
vgrover1515@gmail.com
Offline Slack Channel : www.tinyurl.com/letsdoblockchain
www.meetup.com/Blockchain-Revolution
Blockchain & Authoring Smart
Contracts

2
Agenda
● Introduction
● Smart Contracts
● Test RPC and Geth
● Truffle
● Dapp

3
Introduction
Blockchain creates a permanent, digitized chain of transactions, grouped in blocks,
allowing virtually anything of value to be tracked and traded, without requiring a
central point of control
Blockchain is a peer-to-peer distributed
ledger technology for a new generation of
transactional applications.

4
What is in Block
Header, Transaction Count, Block Content
Transaction
Input Output

5
Public, Private, Consortium/Hybrid
First thing First – Do you even need a Blockchain?
● Database with Shared Access
● Who Controls the Functionality?
● Public or Private Transactions?
● Determining Consensus?

6
Public, Private, Hybrid
● Public Blockchain: Fully Public, Secured by Cryptocurrencies (Proof
of work, Proof of Stake etc), Its for Anyone – Read, Send
Transactions, Participate in Consensus Process
● Private Blockchain: Controlled Access, Write permissions are kept
centralized to one organization, Read permissions may be public or
not (or some part may be public)
● Consortium/Hybrid Blockchain: Pre-selected set of nodes for eg: 15
financial institutions

7
Public, Private, Hybrid
Public Blockchain
● Freedom
● Neutrality
● Openness
Private Blockchain
● Known Validator (51% risk
goes away)
● Cheaper Transactions
● Privacy
No way that there is going to be One way to do Blockchain

8
Bitcoin – Digitally Signed

9
Ethereum
● Founder of Ethereum - Vitalik Buterin (22 year old) won the 2014 World
Technology Award for invention of Blockchain.
● Ethereum to build programming tools to make Blockchain power
any/everything.
● Ethereum is Dynamic and Programmable. You can implement the way
you want. For eg: Using Java Script you can implement almost anything.

10
What is Better with Ethereum

11
Smart Contract
Smart contracts are computer protocols that
facilitate, verify, or enforce the negotiation or
performance of a contract, or that make a
contractual clause unnecessary.
Smart contracts usually also have a user interface
and often emulate the logic of contractual clauses.
Trust the
Bank
Trust the
Code

12
Smart Contract – Online Browser

13
Smart Contract – Mist

14
Different Needs Different Clients
● When Developing
● Ethereum JS TestRPC
● When Deploying:
● Geth
● Webthree
● Others

18
Truffle
What is Truffle
● Development Environment
● Testing Framework
● Asset Pipeline

19
Truffle
What do you get with Truffle
● Built-in smart contract compilation, linking, deployment and binary management.
● Automated contract testing with Mocha and Chai.
● Configurable build pipeline with support for custom build processes.
● Scriptable deployment & migrations framework
● Network management for deploying to many public & private networks.
● Interactive console for direct contract communication
● Instant rebuilding of assets during development.
● External script runner that executes scripts within a Truffle environment.
● Support for JavaScript, SASS, ES6 and JSX built-in.

21
Getting Started with Truffle
● Getting Started
● Install Truffle
● Commands
● mkdir myproject
● cd myproject
● truffle init
● app
● contracts
● migrations
● test
● truffle.js
● truffle compile

22
Testing with Truffle
● Automated Testing
● Mocha
● Assertion
● Chai
● All test files should be located in the ./tests directory. Truffle will only run test files with the following
file extensions: .js, .es, .es6, and .jsx. All other files are ignored.

23
Interacting with SmartContract
● Use Web3
● Little Difficult though
● Use Ether Pudding
● Chai
● All test files should be located in the ./tests directory. Truffle will only run test files with the following
file extensions: .js, .es, .es6, and .jsx. All other files are ignored.

25
Dapp
● Frontend and Backend
● Reactive Programming – callback functions
● Web3.js
● version
● api
● node/getNode
● network/getNetwork
● ethereum/getEthereum
● whisper/getWhisper
● isConnected()
● setProvider(provider)
● CurrentProvider
● Etc etc etc

26
Thanks

Blockchain - Introduction and Authoring Smart Contracts

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