Table Of Contents
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Introduction
How blockchain works?
Key feature of blockchain
Types of blockchain
Blockchain vs traditional databases
Real life applications
Popular cryptocurrencies
Advantages and challenges
Conclusion & Q/A
References
Introduction
What is Blockchain?
Blockchain is a digital technology used to store data in blocks.
These blocks are linked together to form a chain — hence the name
"Blockchain."
In simple terms:
Blockchain = Block (Data) + Chain (Link)
How blockchain works??
1⃣ Data is stored in a block
2⃣ Each block contains a unique code called a hash
3⃣ Blocks are linked to the previous block, creating a chain
4⃣ The entire network holds copies of the same data, making it easy to
detect any false data.
Key features of blockchain
💠 Decentralization — No single central authority, the network controls it.
🔐 Security — Data is protected using cryptography.
🔎 Transparency — Everyone can view transactions.
🔒 Immutability — Once data is added, it cannot be changed.
Types of blockchain
Public Blockchain — Open for everyone (e.g., Bitcoin, Ethereum)
Private Blockchain — Restricted to specific users (e.g., inside a
company(IBM’s Hyperledger Fabric))
Consortium Blockchain — Controlled by a group of organizations.(e.g.,
Banks, supply chain networks)
Hybrid Blockchain — Public + Private (e.g., Hospital system: patient
data is private but research data is public)
Blockchain vs Traditional databases
Blockchain
Traditional databases
Decentralized
Centralized
Immutable
Mutable(can be altered)
High security
Moderate security
Peer-to-Peer network
Client-server model
Real life applications
💸 Finance — Cryptocurrency and secure transactions
🏥 Healthcare — Secure storage for patient records
🚢 Supply Chain — Transparent tracking of goods
🗳 Voting — Tamper-proof digital elections
Advantages and Challenges
✅ Advantages:
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Trustworthy and secure system
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Transparent data handling
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Eliminates middlemen and reduces costs
⚠ Challenges:
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Scalability issues (slow transactions in large networks)
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High energy consumption
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Legal and regulatory uncertainties
Conclusion & Q/A
Blockchain is not limited to cryptocurrencies — it’s a powerful
technology transforming industries by making them more secure,
transparent, and efficient.
❓ Any Questions?
References
[1] Pilkington, Marc. "11 Blockchain Technol-Ogy: Principles and Applications."
Re-Search Handbook On Digital Transfor-Mations (2016): 225.
[2] Crosby, M., Pattanayak, P., Verma, S., & Kalyanaraman, V. (2016). Blockchain
Tech-Nology: Beyond Bitcoin. Applied Innova-Tion, 2, 6-10.
[3] A. Bahga, V. Madisetti, “Blockchain Platform for Industrial Internet of Things”,
Journal
of Software Engineering and Applications, No. 9, pp. [36]533-546, 2016