This document provides an overview of blockchain technology, including its history, definition, types, uses, and advantages/disadvantages. It discusses how blockchain works, security threats, and blockchain as a service (BaaS). The history of blockchain is traced from 1991 descriptions to 2008 when Bitcoin was released using blockchain as a distributed ledger. Blockchain is defined as a distributed database of records linked through cryptography. The main types are public and private blockchains. Potential uses include financial transactions, supply chain management, and smart contracts.

1. By : Ali H . Ahmed
Blockchain Technology
Kirkuk University
College of computer Science & Information Technology
Perpetrate
by : Ali H.Ahmed
Supervisor
Dr. Ahmed Chalak Shakir
12-November-2023

2. OutLine
History of Blockchain Technology
Definition of Blockchain
Types of Blockchain technology
Blockchain technology Use to
How does Blockchain Technology work
Advantages & Disadvantages
Blockchain Security Threats
Blockchain as a Service (BaaS)
References
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3. History of Blockchain Technology
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1991
The first description of a cryptographically-secured chain of blocks was
published by Stuart Haber and W. Scott Stornetta
2008
• that the original model for a blockchain was released in
a whitepaper by the Bitcoin developer(s) , working under the
pseudonym Satoshi Nakamoto
• A year later the first of its kind, was implemented by Nakamoto as the
distributed ledger technology for Bitcoin transactions.
2014
was finally separated from digital currency, and developers began
exploring its potential for other applications.

4. Definition of Blockchain
❑ Blockchain is a distributed database but its stored
devices are not connected to a shared server.
❑ In blockchain list of records is stored as blocks and they
are linked by using cryptography(Hash funcation)
❑ 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 so the block is
permanently recorded and it is 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.
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5. Types of Blockchain technology
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Public Blockchain
* Distributed ledger
* Open reading and writing of date
* Immutable
* Decentralized
Ex: Bitcoin , Tron
Private Blockchain
* Permissioned blockchain
* Improved privacy
* Increased scalability
* Centralized
Ex: Hyperledger Fabric

6. Blockchain technology Use to
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7. How does Blockchain Technology work
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8. Advantages & Disadvantages
Advantages
• Enhances Transparency
• Improved Security
• Elimination of Intermediaries
• Traceability and Auditability
• Potential for Cost Reduction
Disadvantages
• Scalability Issues
• High Energy Consumption
• Legal and Regulatory Challenges
• Potential for Misuse
• Complexity and Technological Understanding
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9. Blockchain Security Threats
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10. Blockchain as a Service (BaaS)
offers cloud computing platforms that provide tools for developing and managing blockchain networks. BaaS offers
the infrastructure, network, and marketplace required to develop and deploy blockchain applications . The BaaS
platform helps users build their blockchain-based applications without prior knowledge or experience in this field.
Examples include smart contracts, cryptocurrency wallets, supply chain management systems, etc.
Why
(Baas)
Scalability
Cost
Effectiv
eness
Ease of
Use
Customi
zability
Security
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11. References
https://www.moonpay.com/learn/blockchain
https://imiblockchaincom/
https://bootcamp.northwestern.edu/blog/blockchain-careers/
https://www.researchgate.net/figure/Security-threats-of-blockchain_fig2_343593343
https://www.financestrategists.com/wealth-management/blockchain/blockchain-advantages-and-disadvantages/
]https://scholar.google.com/scholar?q=history+of+blockchain&hl=en&as_sdt=0&as_vis=1&oi=scholart
https://www.investopedia.com/terms/b/blockchainasaservice-baas.asp
https://blockchain.ieee.org/
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12. You Have Any Questions We Have Answers?
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