Blockchain technology allows transactions to be grouped into blocks and recorded in a ledger. Each block is cryptographically linked, making the record permanent and unalterable. This permits untrusting parties to co-create a shared record without relying on a central authority. Blockchains use cryptographic keys, peer-to-peer networks, and a shared ledger to securely transmit unique instances of value in a transparent manner that can be accessed by various servers. There are four basic types of blockchain: private, public, federated, and hybrid. Blockchain provides advantages like improved accuracy, reduced costs, decentralization, transparency, and security of transactions. However, it also faces challenges like needing high-performance and not replacing certain solutions like databases

1. BLOCKCHAIN
TECHNOLOGY

2. What is Blockchain Technology?
A technology that-
Permit transitions to be gathered into block & record.
Transfer of unique instances of value is secured.
Allows untrusting parties with shared interests to co-
create a permanent.
Record the process and exchange without relying on a
central authority is transparent.
Allow the resulting ledger to be accessed by various
servers.

3. 1991-
2008
2010
2012
2014
2016
2018
2009 2011 2013
2
0
1
5
2017
History of Blockchain
Stuart Haber &
Scott Stornetta
work on the first
blockchain
Satoshi Nakamoto
releases Bitcoin
Whitepaper
1st Bitcoin
purchase 10,000
BTC take places
Bitcoin Marketplace
Surpasses $1 Billion
Vitalik Buterin
releases Ethereum
whitepaper
Ethereum
Blockchain is
funded by
crowdsale
Ethereum
Genesis
block created
Bug in
Ethereum DAO
code expolited
and attacked
EOS is unveiled
by block.me as a
new Blockchain
Protocol

4. Cryptographic keys
A means of computing to store the data and
transactions
A peer-to-peer network containing a
shared ledger
Blockchain is a combination of three leading technologies:

5. 4 Basic Types of BlockChain Technology
Private BlockChain
Permissionless
Public BlockChain
Permissionless
Federated BlockChain
Permissionless
Hybrid BlockChain
Permissionless
Open Network
Free Access
No Permission
Shared Ledger
Full Transparency
Closed Network
DTL Authority
On Permission
Shared Ledger
Full Transparency
Organization
Group Access
On Permission
Shared Ledger
Transparency
Organization
Mixed Access
Restriction
Mixed Ledger
Semi-Transparent

7. Advantages of Blockchain
Improved accuracy by removing human
involvement in verification
Cost reductions by eliminating third-party
verification
Decentralization makes it harder to tamper
Trusted recordkeeping
Transactions are secure, private, and efficient
Transparent technology
Efficiency and speed
Improve discoverability
Shared trusted processes
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8. Disadvantages of Blockchain
Need high-performance transactions
Small organization (no business network)
Looking for a database replacement
Looking for a messaging solution
Looking for transaction processing
replacement
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9. https://quokkalabs.com/blog/an
-introduction-to-blockchain-
technology-how-does-it-work/
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