introduce BlockChain

1. BLOCKCHAIN
MINSOO JUN

2. AGENDA
What is Blockchain?
Blockchain Structure?
Where using a Blockchain?
Blockchain Architecture
Do not use in this case

3. AGENDA
What is Blockchain?
Blockchain Structure?
Where using a Blockchain?
Blockchain Architecture
Do not use in this case

4. WHAT IS BLOCKCHAIN :
BlockChain = Ledger

5. WHAT IS BLOCKCHAIN :

6. WHAT IS BLOCKCHAIN
Linked List
SHA 256 (Hash)
A large distributed Ledger
Block = Block Header + D

7. CURRENCY VS. BITCOIN
Currency:
• Money (System of money);
• Cash payments;
• Store value;
• Traded between nations
in exchange markets, which
determine the relative values of the
different currencies;
• Currency are issued by Central
Banks;
• Currencies are defined by
governments;
• High security standards;
• Unique ID for every
Banknote/Coin.
Bitcoin:
• Crypto Money – IT representation of
money;
• Online payments only;
• Store value;
• Bitcoin Exchange;
• Bitcoins can be issued by everyone
who owns a required tool;
• High security standards;
• Decentralized

8. AGENDA
What is Blockchain?
Blockchain Structure?
Where using a Blockchain?
Blockchain Architecture
Do not use in this case

9. Identity and security within a Blockchain

10. ELEMENTS OF CRYPTOCURRENCY
Decentralization
Distributed consensus Proof of work
Digital Signature
Public Key Private Key
Hash Pointers and Data Structure
Block Chain Merkle Tree
Hash Functions
Properties SHA-256

11. SHA-256
Fixed-input
hash function
Arbitrary input
hash functionSHA-256(256bits) + BlockSize(512 bits) = 768 bits
(SHA-256) -> 256 bits

12. STRUCTURE OF BLOCKCHAIN
Transactions
Blocks

13. OUTPUT
Transaction Structure
Transaction
Transaction ID (Hash)
In Out
ScriptSig
Protocol Version
Number of inputs
INPUT
Previous Output Hash
Previous Output Index
ScriptSig (Unlock Sig)
Number of outputs
Output Index
Output Address
Asset Details
ScriptPubKey (Lock Script)
Block lock time
ScriptPubKey

14. AGENDA
What is Blockchain?
Blockchain Structure?
Where using a Blockchain?
Blockchain Architecture
Do not use in this case

17. https://blockchain.info/

18. https://bitcoinwisdom.com/

19. https://bitnodes.21.co/

20. https://bitnodes.21.co/nodes/live-map/

21. AGENDA
What is Blockchain?
Blockchain Structure?
Where using a Blockchain?
Blockchain Architecture
Do not use in this case

22. B2C
Data
Application
Custodial Application
Consumer Application
API
Trust Boundary
Consumer Application
Consumer Application

23. B2B
Data
Application
Custodial Application
API
Trust Boundary
Data
Application
Custodial Application
API
Trust Boundary

24. BLOCKCHAIN BASED
Blockchain
Node
Application
Node
Business B
Node
Business C
Node
Business D
App Application
Business A
App
App API
N N N
Trust Boundary

25. AGENDA
What is Blockchain?
Blockchain Structure?
Where using a Blockchain?
Blockchain Architecture
Do not use in this case

26. CENTRALIZED
SYSTEMS
TIME-DEPENDENT
DATA

27. END

28. LINKS AND MATERIALS
• https://www.coursera.org/course/bitcointech
• https://blockchain.info/
• https://lurkmore.to/Bitcoin
• http://bits.media
• https://bitcoinwisdom.com/
• https://github.com/bitcoin/bitcoin
• https://bitcoin.org/en/
• https://btcu.biz/
• https://btc-trade.com.ua/
• https://en.bitcoin.it/wiki/Main_Page