The document provides an overview of blockchain technology, defining it as a decentralized, digital ledger used for secure transaction recording. It highlights the advantages of blockchain, such as immutability, transparency, and traceability, while also addressing challenges like lack of privacy and scalability. Additionally, it includes a brief history of Bitcoin, including key milestones and the significance of its creator, Satoshi Nakamoto.

1. BLOCK CHAIN

2. Group Members :
Riya Kumari
Ankita Ojaswi
Ujjwal Kumar
Rishi Prakash
Manish Kumar

3. What is
Blockchain ?
• A blockchain is a decentralized, distributed
and public digital ledger that is used to
record transactions across many computers
so that the record cannot be altered
retroactively without the alteration of all
subsequent blocks and the consensus of the
network.
• These blocks are linked using cryptography.
• Each block contains a cryptographic hash
of the previous block, a timestamp, and
transaction data.

4. Advantages of Blockchain
• Immutability
• Transparency
• Censorship
• Traceability

6. Facilitating
the
transaction
PowerPoint
Presentation
Consensus
algorithm
Addition
of the
new
block
Transaction
complete
Formation
of a new
block
Working of Blockchain
Verification
of
transaction

7. Challenges
of
Blockchain
Lack
of
privacy
Hackers
and
shadow
dealing
Complex to
understand
and adopt
Scalability
CHALLENGES

8. • Name used by the presumed inventors
of Bitcoin.
• Born on 5 April 1975 (claimed)
• Nationality : Japanese (claimed)
• Nakamoto devised the
first blockchain database
• Nakamoto's BTC wallet worth approx. 1
million BTC i.e. 5% of total BTC.
Satoshi Nakamoto

9. History
of
Bitcoin
2008
2009
2010
2011
2017
2022
The domain name bitcoin.org was registered and a paper
titled Bitcoin: A Peer-to-Peer Electronic Cash System was posted
The bitcoin network was created & made available to public
Number of businesses accepting bitcoin continued to increase
Other cryptocurrencies started to emerge
Bitcoin is valued for the first time
Russia's War in Ukraine negatively affected the price of Bitcoin

10. What Is Blockchain Mining ?
Blockchain
Mining
Blockchain Mining Process
Need For Blockchain Mining
Types Of Blockchain Mining

11. Conclusion