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1. Blockchain
Technology

2. What is Blockchain?
 Blockchain is a type of decentralized, distributed database or ledger that is used to record transactions across
many computers
 In blockchain list of records is stored as blocks and they are linked by using cryptography.
 Hence we can say that blockchain is a digital record and is used for recording transactions made with
cryptocurrencies such as bitcoins.
 If we add a new block it can be linked with the previous block with the help of a cryptographic block generated
from the previous block, By doing this the block is permanently recorded and it s not broken.
 In blockchain previous transactions alteration is very difficult because all subsequent blocks also need to be
altered. We can say that blockchain is the purest peer-to-peer database that is immutable.

3. Origin of Blockchain Technology
 The blockchain was created by a person (or group of people) using the name (or
pseudonym) Santoshi Nakamoto in 2008 to serve as the public distributed ledger for bitcoin
cryptocurrency transactions.
 The implementation of the blockchain within bitcoin made it the first digital currency to solve
the double-spending problem without the need of a trusted authority or central server .
 Private blockchains have been proposed for business use.

4. Types of Blockchain
 Private Blockchain Networks: Private blockchains operate on closed networks, and tend to work well for
private businesses and organizations.
 Public Blockchain Networks : Bitcoin and other cryptocurrencies originated from public blockchains, which
also played a role in popularizing distributed ledger technology (DLT).
 Permissioned Blockchain Networks: Also sometimes known as hybrid blockchains, permissioned blockchain
networks are private blockchains that allow special access for authorized individuals.
 Hybrid Blockchains: Hybrid blockchains are the combination of both public and private blockchains. In a
hybrid blockchain, some parts of the blockchain are public and transparent, while others are private and
accessible only to authorized and specific participants.

5. The Technology used in Blockchain
 Cryptographic Keys
 Network Protocol
 Distributed Ledger Technology
 Hashing

6. Purpose of Blockchain
 Blockchain uses an online ledger which is very secure.
 There is no third-party interference.
 It used distributed ledger which is very transparent.
 It is a digital world offering many new tools and there are many centralized administrators.
 Since there is no third-party guarantee cost is very low.

7. Blockchain in Cryptocurrency
The term blockchain is often used to refer to cryptocurrency.
Cryptocurrency is a medium of exchange such as US dollars.
It is just an application in the form of e-currency using blockchain.
It is not governed by any financial institution.
The main difference between blockchain and cryptocurrency is that
cryptocurrency is created and held electronically in forms such as a
virtual wallet.
It is decentralized and it is not governed by anyone whereas blockchain
is an advanced record and it has all information related to cryptocurrency
exchanges over a shared system.

8. Blockchain in Bitcoin
CRYPTOCURRENCY bitcoin is one of the crypto currency
Bitcoin is one of the most popular and successful
implementations of blockchain technology. It is an open source
cryptocurrency that uses distributed peer-to-peer computing.
There is no need of a central authority to manage bitcoin
network.

9. Types of Blockchain
 Private Blockchain Networks: Private blockchains operate on closed networks, and tend to work well for
private businesses and organizations.
 Public Blockchain Networks: Bitcoin and other cryptocurrencies originated from public blockchains, which
also played a role in popularizing distributed ledger technology (DLT).
 Permissioned Blockchain Networks: Also sometimes known as hybrid blockchains, permissioned blockchain
networks are private blockchains that allow special access for authorized individuals.
 Hybrid Blockchains: Hybrid blockchains are the combination of both public and private blockchains. In a
hybrid blockchain, some parts of the blockchain are public and transparent, while others are private and
accessible only to authorized and specific participants.

10. Advantages of Blockchain
 Greater Transparency
 Highly secure
 Easily traceable
 High efficiency and speed
 Low cost
 Zero percentage of fraud
 Extremely volatile

11. Disadvantages of Blockchain
 Blockchain programming is complex and
challenging
 It is international so it will have face variety of
global laws
 Blockchain relies on a network effect.
 More power consumption
 Immutability.

12. Thank You!