Blockchain technology was first conceptualized in 1991 but did not have a real-world application until Bitcoin was launched in 2009. A blockchain is a distributed ledger of transactions stored in blocks that are linked together via cryptography. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data. Nodes on the network run by participants hold copies of the blockchain and work to validate transactions and add them to new blocks through a process called mining. This process secures the network and allows participants to reach a consensus without the need for a centralized authority. Today, blockchain technology has applications across many industries that require trustless transactions.

1. Blockchain
Presented By:
Amiya Debadarshi Mohapatra
Regd.No-1601289476
B.Tech.(CSE), 7th Semester,
Section –C, Group-2
Under the guidance of :
Mr. Pradipta kumar Mishra
Asst.Professor,Dept. of CSE

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4. • Blockchain technology was first outlined in 1991 by Stuart Haber and W. Scott
Stornetta, two researchers who wanted to implement a system where
document timestamps could not be tampered with.
• But it wasn’t until almost two decades later, with the launch of Bitcoin in
January 2009, that blockchain had its first real-world application.
• The Bitcoin protocol is built on the blockchain. In a research paper introducing
the digital currency, Bitcoin’s pseudonymous creator Satoshi Nakamoto referred
to it as “a new electronic cash system that’s fully peer-to-peer, with no trusted
third party.
History of Blockchain
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6. Ledger
• A Ledger of transaction stored as immutable Blocks.
• Blocks are connected to one another hence forming a chain.
• The validity of which has been agreed upon by Peers on a Decentralized
network secured by cryptography.
• Whilst Shared Ledger is:
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7. The Components
• Node:refers to client who owns the block.
• Transaction:transfer of something from A to B.
• Block:bundle of transaction
• Miners:Burns effort,time and energy to create blocks,therefore get
rewarded by Block reward+Transction fees.
• Block Reward:New coins created with each blocks,goes to miner.
• Transaction Fees:Small percentage of transaction value,which goes to the
miner.
• Mining:process by which blocks are created,transactions are verified and
added to blockchain.
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8. The Node
• A client,which owns the block.
• A copy of the ledger operated by a participant of the blockchain
network.
• Contains one or more than the one account.
• Miner (Account) mines on the specific node to whom they belongs.
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9. The Block
• Bundle of Transaction.
• Contains previous block hash.
• All blocks are linked using their hash.
• Data can’t be changed in one block without breaking the chain.
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15. Conclusion
• In this short Presentation you were introduced to several concepts of
Blockchain.
• The Bitcoin is the first successful implementation of blockchain. Today,
the world has found applications of blockchain technology in several
industries, where the trust without the involvement of a centralized
authority is desired.
• So welcome to the world of Blockchain.
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16. References
• Ihttps://www.investopedia.com/terms/b/blockchain.asp
• https://www.slideshare.net
• https://www.infodiagram.com
• Blockchain: Blueprint for a New Economy Book by Melanie Swan
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17. Thank you!
Any Queries?