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Block chain

introduce BlockChain

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Block chain

  1. 1. BLOCKCHAIN MINSOO JUN
  2. 2. AGENDA What is Blockchain? Blockchain Structure? Where using a Blockchain? Blockchain Architecture Do not use in this case
  3. 3. AGENDA What is Blockchain? Blockchain Structure? Where using a Blockchain? Blockchain Architecture Do not use in this case
  4. 4. WHAT IS BLOCKCHAIN : BlockChain = Ledger
  5. 5. WHAT IS BLOCKCHAIN :
  6. 6. WHAT IS BLOCKCHAIN Linked List SHA 256 (Hash) A large distributed Ledger Block = Block Header + D
  7. 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. 8. AGENDA What is Blockchain? Blockchain Structure? Where using a Blockchain? Blockchain Architecture Do not use in this case
  9. 9. Identity and security within a Blockchain
  10. 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. 11. SHA-256 Fixed-input hash function Arbitrary input hash functionSHA-256(256bits) + BlockSize(512 bits) = 768 bits (SHA-256) -> 256 bits
  12. 12. STRUCTURE OF BLOCKCHAIN Transactions Blocks
  13. 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. 14. AGENDA What is Blockchain? Blockchain Structure? Where using a Blockchain? Blockchain Architecture Do not use in this case
  15. 15. https://blockchain.info/
  16. 16. https://bitcoinwisdom.com/
  17. 17. https://bitnodes.21.co/
  18. 18. https://bitnodes.21.co/nodes/live-map/
  19. 19. AGENDA What is Blockchain? Blockchain Structure? Where using a Blockchain? Blockchain Architecture Do not use in this case
  20. 20. B2C Data Application Custodial Application Consumer Application API Trust Boundary Consumer Application Consumer Application
  21. 21. B2B Data Application Custodial Application API Trust Boundary Data Application Custodial Application API Trust Boundary
  22. 22. 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
  23. 23. AGENDA What is Blockchain? Blockchain Structure? Where using a Blockchain? Blockchain Architecture Do not use in this case
  24. 24. CENTRALIZED SYSTEMS TIME-DEPENDENT DATA
  25. 25. END
  26. 26. 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

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