Blockchain technology is a decentralized and transparent way to record transactions, best known for its association with digital currencies like Bitcoin. It enhances system transparency and democratizes control but raises privacy concerns regarding sensitive data. Despite not being a panacea, blockchain could significantly impact multiple industries by improving security, efficiency, and transparency.

1. “BLOCKCHAIN TECHNOLOGY”
Presented by :
Sandeep Wakchaure
A
Presentation on

2. CONTENTS
 Abstract
 Introduction
 Literature Survey
 Working
 Example
 Blockchain in News
 Conclusion
 Reference

3. ABSTRACT
 Blockchain Technology is a remarkably, decetralised transparent way of recording
lists of transactions. Their best-known use is for digital currencies such as Bitcoin.
Blockchains shift some control over daily interactions with technology away from
central elites, redistributing it among users. In doing so, they make systems more
transparent and, perhaps, more democratic. That said, this will not probably not result
in a revolution. Indeed, the governments and industry giants investing heavily in
blockchain research and development are not trying to make themselves obsolete, but
to enhance their services. There are also some wider issues to consider. For example,
blockchain's transparency is fine for matters of public record such as land registries,
but what about bank balances and other sensitive data? It is possible, to identify the
individuals associated with transactions. This could compromise their privacy and
anonymity. While some blockchains do offer full anonymity, some sensitive
information simply should not be distributed in this way. Nevertheless, although
blockchains are not the solution for every problem and even if they will not
revolutionise every aspect of our lives, they could have a substantial impact in many
areas and it is necessary to be prepared for the challenges and opportunities they
present

4.  Problem Statement : To know about what is
latest blockchain technology, how its beneficial
and useful than current technology.
 Reason: To remove the intermediates, third
party role their interaction, their processing
charges, to maintain confidentiality of
transaction.
 Purpose of the System:
 Blockchain has the potential to truly disrupt
multiple industries and make processes more
democratic, secure, transparent, and efficient.
What….? , Why….? , How….?

5. INTRODUCTION
 Blockchain :
“The blockchain is an incorruptible digital ledger of economic
transactions that can be programmed to record not just financial
transactions but virtually everything of value.”
 1st
Generation of digital revolution brought us the IoT.
 And 2nd
is Blockchain tech – is bringing us the internet of Value.
 It is essentially a way of keeping records. Any kind of records:
 Records of financial transactions in case of bitcoin, or records of legal
contracts, sensitive patient information in the medical field and so on.
 “Blockchain is basically good for protecting any kind of asset and
transaction that needs to be tamper-resistant.
 This includes transportation, voting, medical records, reputation,
identity, IoT. In fact the entire Internet Archive could be kept on a blockchain

6. LITERATURE SURVEY
Blockchain dose not have specific history as its new technology, but
according to use we can point out the draw back of existing
system,
E.g. Bank Transaction,
- You need valid account with all KYC verified.
- Need beneficiary details like , name, IFSC code, acc no,
- Transaction should be proceed under bank,
- Required few day, Service charges.
- We can not send money to strangers.
This all kind of drawbacks are overcome by the blockchain
technology. Also because of cryptography , Hashing and
Decentralization thousands of companies using technology in
their sectors.

7.  What kind of Block
………
 Each Block Contains :
 A Hash or unique ID, which consists of a random set of unique numbers.
 A hash number from the previous block, which assigns the chronological order
for the ledger.
 All the transactions included in the block. That could be just one or one thousand
of transactions.
 A public key for the sender and the receiver to identify a certain transaction.
 A Block contains Digital signature – using transaction details, private key,
timestamp, or any other relevant information
Block 1 Block nBlock 2

8. HOW IT WORKS
 Hashing (SHA-256 o/p- 256 bit or 64 bit char
long)
 Public /Private Cryptography
 Decentralization through P2P network.
 Blockchain Data Structure.

9. CONT…
 Hashing : In simple terms, hashing means taking an input string
of any length and giving out an output of a fixed length. In the
context of crypto currencies like Bitcoin, the transactions are
taken as an input and run through a hashing algorithm (Bitcoin
uses SHA-256) which gives an output of a fixed length.
 Let’s see how the hashing process works. We are going put in
certain inputs. For this exercise, we are going to use the SHA-256
(Secure Hashing Algorithm 256).

10.  Distributed : Blockchain is essentialy database of all
transaction happning in the nw the data bases are public and not
own by any party and its distributed that is its not own bye any
one instead its stored on many computers across world.
 Synchronization : data base countinuosly sync to mak eit upto
date
 After a transaction the recored is added in pblock and added in
public ledger which any one can see.
 The technology can work for almost every type of transaction
involving value, including money, goods and property.
 Companies racing to adapt blockchain include UBS, Microsoft,
IBM and PwC. The Bank of Canada is also experimenting with
the technology.

11. DATA STRUCTURE

12. DIGITAL SIGNATURE USING KEYS

13. EXAMPLE : BLOCKCHAIN AND
BITCOIN
 If Internet change the way we transfer information then
Blockchain changing a way we transfer value.
 BlockChain can be applied to many business process.
 Buyer and seller can interact and transfer value direct to each
other over the internet without any third party inter
mediatory .
 Blockchain not underlying any private or government body.

14.  The first application of blockchain is Bitcoin ,
 Its P2P decentralized system you don’t need to register to
any particular company or to hand over your details.
 Once you have wallet, you can generate unique address,
 Parties in network verify a transaction , using this we can
not use same bitcoin twice, Bitcoin and theire bae units
must be unique to be owned and have value , to achive this
nodes in N/w create and maintain a history of transaction
for each bitcoin by using Proof-of_work mathematical
problem.
Distributed Ledger :

15. Transaction message broadcasting :

17. RANSOMWARE ATTACK

18. CHARACTERISTIC OF
BLOCKCHAIN
Distributed
Open Source
Peer 2 Peer
Trust Less
Secure

19. Digital Currency
•E-commerce
•Global Payments
•P2P Lending
•Micro- Finance
Record Keeping
•Health care
•Ownership
•Voting
•Intellectual
property
Securities
•Equity
•Private Markets
•Debt
•Derivatives
Smart Contracts
•Digital rights
•Wagers
•Escrow
Blockchain
Applications

20. BLOCK CHAIN IN
NEWS

26. CONCLUSION
Blockchain, mostly known as the backbone technology behind Bitcoin, is one
of the hottest and most intriguing technologies currently in the market. Since 2013
Google searches for “blockchain” have risen 1900%. Similar to the rising of the
internet, blockchain has the potential to truly disrupt multiple industries and make
processes more democratic, secure, transparent, and efficient. Entrepreneurs,
startup companies, investors, global organizations and governments have all
identified blockchain as a revolutionary technology. As its a decentralized and the
cryptographic technology no one can hack it, hence their are lots of areas Private,
governments peer to peer sector the blockchain is useful. As example of bitcoin it
removed role of Bank that is middleware between two parties, this is more secure
trustable technology and because of many benefits it will take place in different
areas, to make their operation transparent, secure, efficient.

27. REFERENCES
[1] Bitcoin : A Peer to Peer Electronic Cash System. By Santoshi
Nakamoto.
[2]Application of Block Chain in Multi Level Demand Response
Reliable Mechanism, 2017, Gaoying Cui, Kun Shi , Yuchen Qin,
Lin Liu Bin Li. 3rd
International Conference, 2017
[3] https://en.wikipedia.org/
[4] Application of Asset Securitization and Block Chain of Internet
Financail firms, Xiao Wan, Qingfan Hu, Manlian Yu.
[5] https://www.quora.com/
[6] https://www.techgig.com/