This document provides an overview of blockchain technology. It discusses that a blockchain is a growing list of records called blocks that are linked using cryptography. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data. Blockchains have a history dating back to 2008 and were originally invented by Satoshi Nakamoto to serve as the public transaction ledger for bitcoin. Blockchains can be public, private, or hybrid. They have various uses including cryptocurrencies, smart contracts, financial services, supply chains, and more. The document outlines the structure, formation, and types of blockchains as well as advantages, challenges, and potential applications in Bangladesh.

1. PRESENTATION
On Blockchain
Prepared by
Naimur Rahman Nishat
Course Teacher:
Mr. Md. Rizwan Hassan
Associate Professor, DB

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What is Blockchain?
A blockchain, originally block chain, is a
growing list of records, called blocks,
that are linked using cryptography.
Each block contains a cryptographic
hash of the previous block, a
timestamp, and transaction data

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History
Invention:
• Satoshi Nakamoto in 2008
Purpose of Invention:
• To serve as the public transaction ledger of the
cryptocurrency bitcoin

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Structure

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Structure
Blockchain Formation
Genesis Block
Main Chain
Orphan Chain

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A Digital Transaction Using Blockchain

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Uses of Blockchain
• Most cryptocurrencies use blockchain technology to record
transactionsCryptocurrencies
• Blockchain-based smart contracts are proposed contracts that can be
partially or fully executed or enforced without human interactionSmart Contracts
• Banks are interested in this technology because it has potential to
speed up back office settlement systemsFinancial Services
• blockchains can be used to catalog game assetsVideo Games
• The Blockchain in Transport Alliance works to develop open standards
for supply chainsSupply Chain
• Insurance, P2P, Online Voting etc.Other Uses

10. IBM Blockchain 2015
Financial Services

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Types of Blockchain
Public
Blockchain
Private
BlockchainHybrid
Blockchain

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Public Blockchain
The Bitcoin blockchain &
The Ethereum blockchain
Most known
public
blockchains
No Access Rstiction
Usually offer
economic incentives

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Private Blockchain
Access Restriction
Requires Administrators
Invitation

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Hybrid Blockchain
Has a
combination
Centralized
features &
Decentralized
features
The exact
workings of the
chain
Vary based on
portions of
centralization &
decentralization

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Advantages of Blockchain

17. Challenges of Blockchain

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Blockchain
User

20. Blockchain in Bangladesh
Bangladesh is one of only 6 countries in the
world that are considered “hostile” to bitcoin
• Range of its use is not
confined to bitcoin
Huge
Potentiality

21. Blockchain in Bangladesh

22. THANK YOU