Blockchain is the latest tech trend in the valley.How it works .How to write solidity.

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SUMIT RAJPAL (1747126)
BLOCKCHAIN & CRYPTOCURRENCY

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● A mathematical structure for storing data in a way that
is nearly impossible to fake. It can be used for all
kinds of valuable data.
Features of Blockchain :-
● Digital Ledger.
● Chain of the block that contains information
● Linked using secured cryptography.
What is Blockchain ?

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Components of a Block :-
● Data.
● Hash.
● Hash of Previous Block.
How Blockchain Works ?

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Advantages over traditional storage ?
● Decentralized System.
● Public Ledgers.
● Verification of Every Individual Transaction.
● Low or No Transaction Fees

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Types of Blockchain
● The data is contain in chain of blocks which contain information.
The data which is stored inside a block depends on the type of
blockchain.
Three types of Blockchain are :
● Public Blockchain
● Private Blockchain
● Consortium or Federated Blockchain

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Blockchain Use Cases
Blockchain Technology is used widely in the different sectors as given in the following table.
Sector Usage
Market
• Billing, monitoring and Data Transfer
• Quota management in the Supply Chain Network
Government
• Voting, propositions P2P bond,
• Digitization of documents/ contracts and proof of ownership for transfers
• Registry & Identify
IOT
• Smart home networks
• Integrated smartcity.
Health • Organ Donation Database
Finance • Digital Currency Payment
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Cryptocurrency
A cryptocurrency is a digital or virtual currency that uses cryptography for
security.
Uses of Cryptocurrency :
● Going green.
● Travel (ex cheapair.com).
● Education.
● Fund-raising.
● Food & Beverages (ex starbucks)
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Top Cryptocurrency in the Market
Currency Market Cap Current Price
Bitcoin $111,308,641,196 Rs 4,69,202.00
Ethereum $50,162,207,298 Rs 36,599.00
Ripple $20,702,212,180 Rs 30.25
Zilliqa $648,341,173 Rs 6.20
Zebi $25,583,894 Rs 2.95
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Issues Related to Cryptocurrency
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Issues Related to Cryptocurrency
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● Lack of regulation creates a risky environment.
● Government Intervention.
● Pump and Dump ICO Schemes.
● The Activities of Cybercriminals.

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What Effects Crypto Price ?
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Factors to consider while buying
Cryptocurrency ?
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Cryptocurrency Exchanges in India ?
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● Coindelta.
● Koinex.
● BtcxIndia.

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Decentralization App
• DApp has its backend code running on a decentralized
peer-to-peer network.
• The Ethereum white paper splits dapps into three types:
1. Apps that manage money.
2. Apps where money is involved .
3. Apps in the "other" category, which includes voting and
governance systems.

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Types of Ethereum Network
• Ethereum Main
• Ropsten
• Kovan
• Rinkeby

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Transaction on Ethereum Network
• Nounce –How many times sender sent a transaction .
• To – Account to which money is going.
• Gas price – Amount of gas a transaction is consumed.
• Value –Amount of Ether is sent to the target address.

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Transaction on Ethereum Network
Gas price ?

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51 % Attack
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Company 1 Company 2 Company 3 Company 4
XYZ COIN

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Solidity/Smart Contract in Ethereum
• Extension is .sol.
• Strongly Typed.
• Similar to Java Script.
• Bigger the contract bigger the Gas Amount.

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Access Specifiers in Solidity
• Private – Only the current contract can call a function.
• View – Only for viewing the function cannot modify it.
• Pure – Will not modify or read the contract data.
• Payable – Only call to transfer Ether.

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Tools for Dapp Development
• Web3 Library
• MetaMask
• Demo Account
• Editor – Visual Studio Code,etc

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Demonstration

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