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Introduction to Blockchain Technology

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  • Presented by : Samuel Akpah�Introduction to Blockchain �Beginner Level

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Overview

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  • What is Blockchain?
  • History and Evolution
  • Key Features
  • How Blockchain Works
  • Types of Blockchain
  • Applications and Use Cases
  • Advantages and Challenges
  • Future of Blockchain

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What is Blockchain?

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  • A decentralised digital ledger that records transactions across multiple computers.
  • Ensures data transparency, security, and immutability.
  • Each transaction is stored in a block, linked together to form a chain.

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Brief History

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  • 1991: First concept introduced by Stuart Haber & W. Scott Stornetta.
  • 2008: Bitcoin introduced by Satoshi Nakamoto using blockchain as its core technology.
  • 2015: Ethereum introduced smart contracts.
  • Present: Used in finance, healthcare, education, governance, and supply chain systems.

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Key Characteristics

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  • Decentralisation – No single authority controls the network.
  • Transparency – All transactions are visible to network participants.
  • Security – Uses cryptography to secure data.
  • Immutability – Once recorded, transactions cannot be altered.
  • Consensus Mechanisms – Agreement among participants before a transaction is added.

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How Blockchain Works

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  • 1. A user requests a transaction.
  • 2. The transaction is broadcast to a peer-to-peer network.
  • 3. The network validates the transaction using consensus algorithms.
  • 4. The transaction is added to a new block.
  • 5. The block is added permanently to the blockchain.
  • 6. The transaction is complete and visible to all participants.

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Types of Blockchain

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  • Public Blockchain: Open to everyone (e.g., Bitcoin, Ethereum).
  • Private Blockchain: Restricted access (e.g., Hyperledger Fabric).
  • Consortium Blockchain: Controlled by a group of organisations.
  • Hybrid Blockchain: Combination of public and private models.

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Applications of Blockchain

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  • Finance: Cryptocurrencies, cross-border payments, smart contracts.
  • Healthcare: Secure patient records.
  • Education: Certificates and transcripts verification.
  • Supply Chain: Tracking goods and preventing counterfeiting.
  • Government: Transparent voting systems and land registration.

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Advantages

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  • Enhanced security
  • Reduced cost and time
  • Increased transparency
  • Improved traceability
  • Reduced fraud and corruption

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Challenges

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  • High energy consumption
  • Limited scalability
  • Regulatory uncertainty
  • Data privacy concerns
  • Lack of standardisation

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The Future of Blockchain

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  • Integration with Artificial Intelligence (AI) and Internet of Things (IoT).
  • Expansion into governance, healthcare, and education sectors.
  • Development of sustainable blockchain systems.
  • Growth of Web3 and decentralised finance (DeFi).

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Conclusion

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  • Blockchain is reshaping industries by building trust, transparency, and efficiency.
  • Its potential extends beyond cryptocurrency to transform everyday transactions.

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References

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  • Nakamoto, S. (2008). Bitcoin: A Peer-to-Peer Electronic Cash System.
  • Swan, M. (2015). Blockchain: Blueprint for a New Economy.
  • Tapscott, D., & Tapscott, A. (2016). Blockchain Revolution.