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Bitcoin 2.0(blockchain technology 2)

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Bitcoin 2.0(blockchain technology 2)

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Introduction to Bitcoin 2.0 or Blockchain 2.0 and Related Topics

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Bitcoin 2.0(blockchain technology 2)

  1. 1. Bitcoin 2.0 Blockchain Technology PAG Platform Advisory Group ๊น€์šฐ์Šน 2015.02.11 (์ˆ˜)
  2. 2. PAG Platform Advisory Group Bitcoin ? Cryptocurrency Payment System Mining Open Source Peer-to-Peer Decentralized Distributed Blockchain Public Ledger Mining Pool Digital Wallet
  3. 3. PAG Platform Advisory Group Wallet โ€ฆ
  4. 4. PAG Platform Advisory Group The Real Value? $1163/BTC $150/BTC
  5. 5. PAG Platform Advisory Group Trusted? ๊ฑฐ๋ž˜์กฐ์ž‘ , 5000์–ต ์†์‹ค ์ต๋ช…์˜ ๋งˆ์•ฝ๊ฑฐ๋ž˜ & ๋ˆ์„ธํƒ ํ•ดํ‚น!!
  6. 6. PAG Platform Advisory Group Mining?
  7. 7. PAG Platform Advisory Group Altcoins โ€“ ์žก์ฝ”์ธ!!
  8. 8. PAG Platform Advisory Group Under the hood
  9. 9. PAG Platform Advisory Group Bitcoin ? Cryptocurrency Payment System Mining Open Source Peer-to-Peer Decentralized Distributed Blockchain Public Ledger Mining Pool Digital Wallet
  10. 10. PAG Platform Advisory Group ํ™”ํ๋ฅผ ์ด์šฉํ•œ ์ง€๋ถˆ ์ ˆ์ฐจ ๊ณ ๊ฐ ์ด์šฉ ๊ธฐ๊ด€ (1) ์ฃผ๋ฌธํ•œ ์žฌํ™”์™€ ๊ฐ™์€ ๊ฐ€์น˜์˜ ํ™”ํ๋ฅผ ์ง€๋ถˆ (2) ์žฌํ™”(์ œํ’ˆ/์„œ๋น„์Šค)๋ฅผ ์ œ๊ณต (1) (2) ์ค‘์•™ ์€ํ–‰ ํ™”ํ์— ๋Œ€ํ•œ ๊ฐ€์น˜ ๋ณด์ฆ
  11. 11. PAG Platform Advisory Group ์‹ ์šฉ์นด๋“œ๋ฅผ ์ด์šฉํ•œ ์ง€๋ถˆ ์ ˆ์ฐจ ๊ณ ๊ฐ ์ด์šฉ ๊ธฐ๊ด€ (1) (2) ์นด๋“œ์‚ฌ (1) ์ฃผ๋ฌธํ•œ ์žฌํ™”์™€ ์ž์‹ ์˜ ์‹ ์šฉ์นด๋“œ ์ •๋ณด๋ฅผ ์ œ๊ณต (2) ์ด์šฉ๊ธฐ๊ด€์€ ์‹ ์šฉ์นด๋“œ์ •๋ณด์™€ ๊ฑฐ๋ž˜์ •๋ณด๋ฅผ ์นด๋“œ์‚ฌ์— ์ œ๊ณต, ๊ฑฐ๋ž˜ ์Šน์ธ ์š”์ฒญ (3) ์นด๋“œ์‚ฌ๋Š” ๊ฑฐ๋ž˜์˜ ์ •์ƒ์—ฌ๋ถ€๋ฅผ ํ™•์ธํ•ด์„œ ์ด์šฉ๊ธฐ๊ด€์— ์Šน์ธ๊ฒฐ๊ณผ ์ „๋‹ฌ (4) ์žฌํ™”๋ฅผ ๊ณ ๊ฐ์— ์ œ๊ณต (5) ์นด๋“œ์‚ฌ๋Š” ๊ณ ๊ฐ์—๊ฒŒ ๊ตฌ๋งค ๋Œ€๊ธˆ ์š”์ฒญ (6) ๋Œ€๊ธˆ ์ง€๋ถˆ (3) (4) (5) (6) ์ง€๋ถˆ ๋ณด์ฆ/์ˆ˜์ˆ˜๋ฃŒ/์—ฐํšŒ๋น„
  12. 12. PAG Platform Advisory Group ์—์Šคํฌ๋กœ๋ฅผ ์ด์šฉํ•œ ์ง€๋ถˆ ์ ˆ์ฐจ ๊ณ ๊ฐ ์ด์šฉ ๊ธฐ๊ด€ (1) (3) ์—์Šคํฌ๋กœ ์„œ๋น„์Šค (1) ์žฌํ™”(์ œํ’ˆ/์„œ๋น„์Šค) ๋ฅผ ์š”์ฒญ (2) ์žฌํ™”์— ํ•ด๋‹นํ•˜๋Š” ๊ธˆ์•ก์„ ์ž…๊ธˆ (3) ์ž…๊ธˆ ๋‚ด์—ญ ํ™•์ธ (4) ์žฌํ™”(์ œํ’ˆ/์„œ๋น„์Šค)๋ฅผ ๊ณ ๊ฐ์—๊ฒŒ ์ œ๊ณต (5) ๊ณ ๊ฐ์€ ์žฌํ™”์˜ ์ œ๊ณต ์—ฌ๋ถ€๋ฅผ ์—์Šคํฌ๋กœ ์„œ๋น„์Šค์— ํ™•์ธ ๋ฐ ํ™•์ • (6) ๋Œ€๊ธˆ ์ง€๊ธ‰ (6) (4) (5) (2) ์ง€๋ถˆ ๋ณด์ฆ/์ˆ˜์ˆ˜๋ฃŒ
  13. 13. PAG Platform Advisory Group ๊ณต์ธ์ธ์ฆ์„œ ์ธ์ฆ ์ ˆ์ฐจ ์ถœ์ฒ˜: KISA (์ „์ž์„œ๋ช…์ธ์ฆ๊ด€๋ฆฌ์„ผํ„ฐ) , http://www.rootca.or.kr/kor/accredited/accredited06_01.jsp
  14. 14. PAG Platform Advisory Group ๊ณต์œ  ๊ฒฐ์ œ ํ”Œ๋žซํผ ์ถœ์ฒ˜: ๋ถ€์‚ฐ๊ฒฝ์ œ์ง„ํฅ์› , http://www.sharebusan.kr/bepa/template.php?midx=33
  15. 15. PAG Platform Advisory Group ๊ณตํ†ต์ ์ด ๋ฌด์—‡์ผ๊นŒ์š”?
  16. 16. PAG Platform Advisory Group Centralized Trusted 3rd Party!
  17. 17. PAG Platform Advisory Group 2 Phase Commit Protocol
  18. 18. PAG Platform Advisory Group How can we trust transactions of the P2P network without centralized trusted 3rd Party?
  19. 19. PAG Platform Advisory Group Blockchain Blockchain Technology Shared Public Ledger = Blockchain P2P ๋„คํŠธ์›ŒํŠธ์—์„œ ๋ฐœ์ƒํ•˜๋Š” ๋ชจ๋“  ๊ฑฐ๋ž˜(ํŠธ๋žœ์žญ์…˜) ์ •๋ณด๋ฅผ ๋‹ด๊ณ  ์žˆ๋Š” ์›์žฅ(๋ธ”๋ก์ฒด์ธ)๋ฅผ ๋ชจ๋“  ๋…ธ๋“œ(Peer)๊ฐ€ ๊ฐ์ž ์ €์žฅํ•˜๊ณ  ์ƒˆ๋กœ์šด ๊ฑฐ๋ž˜๊ฐ€ ์ผ์–ด๋‚  ๋•Œ ๋งˆ๋‹ค ์ž์‹ ๋“ค์ด ๊ฐ€์ง„ ์ด ๋ธ”๋ก์ฒด์ธ์„ ์—…๋ฐ์ดํŠธํ•˜๊ณ  ๋ฌด๊ฒฐ์„ฑ ์„ ์œ ์ง€ํ•˜๋„๋ก ํ•˜๋Š” ๊ธฐ์ˆ  & ์•Œ๊ณ ๋ฆฌ์ฆ˜ blockblock blockblock blockblock blockblock blockblock transactiontransaction transactiontransaction blockblock blockblock
  20. 20. PAG Platform Advisory Group Blockchain Technology Transaction โ€ข ๊ฐ ๋…ธ๋“œ๊ฐ€ ๋ฐ์ดํ„ฐ๋ฅผ ์ฃผ๊ณ  ๋ฐ›๋Š” ์ฃผ์†Œ <bitcoin ์—์„œ ๋งํ•˜๋Š” ์ง€๊ฐ‘์ฃผ ์†Œ ๋˜๋Š” ๊ณ„์ขŒ> ๋Š” ๊ณต๊ฐœํ‚ค(Public Key) ๋ฅผ ์ด์šฉ ๋น„ํŠธ์ฝ”์ธ์—์„œ๋Š” ์ด transaction ์ž์ฒด๊ฐ€ ํ™”ํ์˜ ์˜๋ฏธ(๊ฐ€์น˜) ๋ฅผ ๋‹ด๊ณ  ์žˆ์Œ โ€ข Transaction ์˜ ๋‚ด์šฉ์„ ๋น„๋ฐ€ํ‚ค(Private Key) ๋กœ ์„œ๋ช…ํ•ด์„œ ๋‚ด์šฉ์„ ์ „๋‹ฌ โ€ข ๋น„ํŠธ์ฝ”์ธ์˜ ์†Œ์œ ๊ถŒ ๋ณ€๊ฒฝ ๋‚ด์šฉ์„ ๋‹ด๊ณ  ์žˆ์Œ โ€ข 1.0 ๋น„ํŠธ์ฝ”์ธ์„ ๊ฐ€์ง€๊ณ  ์žˆ๋Š” A๊ฐ€ 0.7 ์ฝ”์ธ์„ B์—๊ฒŒ ์ „๋‹ฌํ•œ๋‹ค๋Š” ์˜๋ฏธ๋Š” โ€ข ( Aร B , 0.7 ; Aร A, 0.3) + Private Key ๋กœ ์„œ๋ช…
  21. 21. PAG Platform Advisory Group Blockchain Technology ๋น„์ž”ํ‹ด ์žฅ๊ตฐ ๋ฌธ์ œ โ€œ์ ๊ตฐ์˜ ๋„์‹œ๋ฅผ ๊ณต๊ฒฉํ•˜๋ ค๋Š” ๋น„์ž”ํ‹ฐ์›€ ์ œ๊ตญ๊ตฐ์˜ ์—ฌ๋Ÿฌ ๋ถ€๋Œ€๊ฐ€ ์ง€๋ฆฌ์ ์œผ๋กœ ๋–จ์–ด์ง„ ์ƒํƒœ ์—์„œ ๊ฐ ๋ถ€๋Œ€์˜ ์ง€ํœ˜๊ด€๋“ค์ด (์ค‘๊ฐ„์— ์žกํž์ง€๋„ ๋ชจ๋ฅด๋Š”) ์ „๋ น์„ ํ†ตํ•ด ๊ต์‹ ํ•˜๋ฉด์„œ ๊ณต๊ฒฉ ๊ณ„ํš์„ ํ•จ๊ป˜ ์„ธ์šฐ๋Š” ์ƒํ™ฉ์„ ๊ฐ€์ •ํ•˜๊ณ  ์žˆ๋‹ค. ์ด ๋ถ€๋Œ€์˜ ์ง€ํœ˜๊ด€ ์ค‘ ์ผ๋ถ€์—๋Š” ๋ฐฐ์‹ ์ž๊ฐ€ ์„ž์—ฌ์žˆ์„ ์ˆ˜ ์žˆ๊ณ , ๋ฐฐ์‹ ์ž๋Š” ๊ทœ์น™์„ ์ถฉ์‹คํžˆ ๋”ฐ๋ฅด๋Š” ์ถฉ์งํ•œ ์ง€ํœ˜๊ด€๋“ค๊ณผ ๋‹ฌ๋ฆฌ ๊ทœ์น™์— ์–ฝ๋งค์ด์ง€ ์•Š๊ณ  ๋งˆ์Œ๋Œ€๋กœ ํ–‰๋™ํ•  ์ˆ˜ ์žˆ๋‹ค. ์ด ๋•Œ ๋ฐฐ์‹ ์ž์˜ ์กด์žฌ์—๋„ ๋ถˆ๊ตฌํ•˜๊ณ  ์ถฉ์งํ•œ ์ง€ํœ˜๊ด€๋“ค์ด ๋™์ผํ•œ ๊ณต๊ฒฉ ๊ณ„ํš์„ ์„ธ์šฐ๊ธฐ ์œ„ํ•ด์„œ๋Š” ์ถฉ์งํ•œ ์ง€ํœ˜๊ด€๋“ค์˜ ์ˆ˜๊ฐ€ ์–ผ๋งˆ๋‚˜ ์žˆ ์–ด์•ผ ํ•˜๋ฉฐ, ์ด ์ง€ํœ˜๊ด€๋“ค์ด ์–ด๋–ค ๊ทœ์น™์„ ๋”ฐ๋ผ ๊ต์‹ ํ•ด์•ผ ํ•˜๋Š”์ง€์— ๋Œ€ํ•œ ๋ฌธ์ œโ€
  22. 22. PAG Platform Advisory Group Blockchain Technology Miner โ€ข P2P ๋„คํŠธ์›Œํฌ ์•ˆ์—์„œ ํŠธ๋žœ์žญ์…˜์— ๋Œ€ํ•œ ๋ฌด๊ฒฐ์„ฑ์„ ๊ฒ€ํ†  ํ•˜๊ณ  ์ปจํŽŒํ•˜๋Š” ์—ญํ• ์„ ํ•˜๋Š” ๋…ธ๋“œ๋“ค์„ ๋งˆ์ด๋„ˆ โ€ข ๊ฐ ๋…ธ๋“œ๊ฐ„ ๊ฑฐ๋ž˜(ํŠธ๋žœ์žญ์…˜)์„ ๋‹ค์ˆ˜์˜ ์ œ 3์ž๊ฐ€ ๊ณต์ฆํ•˜๋Š” ๊ฐœ๋… โ€ข ๋ชจ๋“  ๊ฑฐ๋ž˜์— ๋Œ€ํ•œ ์ •๋ณด๋ฅผ ์ €์žฅํ•˜๋Š” ๋ธ”๋ก์„ ์ฐพ์•„๋‚ด๊ณ  ๊ฒ€์ฆํ•ด์ฃผ ๋Š” ์—ญํ• ์„ ํ•ด์ค€๋‹ค.
  23. 23. PAG Platform Advisory Group Blockchain Technology Mining ๋‹จ, ์•„๋ฌด๋‚˜ ์ด๋Ÿฐ ์ผ์„ ํ•˜๋ฉด ์•ˆ๋˜๊ธฐ ๋•Œ๋ฌธ์— Proof of Work ์‹œ์Šคํ…œ ๋„์ž… โ€ข ๋…ธ๊ฐ€๋‹ค๋ฅผ ํ–ˆ์œผ๋‹ˆ ๋„ˆ ๋ง์„ ๋ฏฟ์–ด์ฃผ๋งˆ!! โ€ข ํ•ดํ‚นํ• ๋ ค๋ฉด ์ตœ์†Œํ•œ ์ด๋Ÿฐ ์ฐฉํ•œ ๋…ธ๋“œ๋“ค๋ณด๋‹ค ๋งŽ์€ ๋น„์œจ์˜ ๋…ธ๋“œ๋ฅผ ์žฅ์•…ํ•˜๋Š” ๊ฒƒ์ด ํ•„์š”. โ€ข ์‹œ๊ฐ„์ด ํ๋ฅผ ์ˆ˜๋ก ๋” ํž˜๋“ค์–ด์ง„๋‹ค. โ€ข 1 vote / 1 CPU โ€ข Hash Function : SHA-256 (Bitcoin์˜ ๊ฒฝ์šฐ) โ€ข ์ผ์ •ํ•œ ์ˆซ์ž์˜ ๋…ธ๋“œ๊ฐ€ ํŠธ๋žœ์žญ์…˜์„ ์ธ์ •ํ•˜๋ฉด ํ•ด๋‹น ํŠธ๋žœ์žญ์…˜์„ ์ปจํŽŒํ•˜๋ฉด ๋‚˜๋จธ์ง€ ๋…ธ๋“œ๋“ค๋„ ๋ง˜ ๋†“๊ณ  ๋ธ”๋ก์ฒด์ธ์„ ์—…๋ฐ์ดํŠธ โ€ข ๊ณ ์ƒํ–ˆ์œผ๋‹ˆ ๋ณด์ƒ์„ ํ•ด์ฃผ๋งˆ. โ€ข 25 Bitcoin / Block + Transaction Fee
  24. 24. PAG Platform Advisory Group Blockchain Technology Bitcoin is programmable money โ€ข ๊ฐ ํŠธ๋žœ์žญ์…˜ ์ •๋ณด๋Š” ์ŠคํŠธ๋ฆฝํŠธ ์‹œ์Šคํ…œ์ด๋ผ๊ณ  ๋ถˆ ๋ฆฌ์šฐ๋Š” ์ผ์ข…์˜ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด๋กœ ํ‘œํ˜„ โ€ข ์Šคํฌ๋ฆฝํŠธ ์‹œ์Šคํ…œ์„ ํ™•์žฅํ•ด์„œ ๋‹ค์–‘ํ•œ ๋น„์ฆˆ๋‹ˆ์Šค ๋ชจ๋ธ์ด๋‚˜ ๋„๋ฉ”์ธ์— ์ ์šฉํ•˜๊ณ ์ž ํ•˜๋Š” ๊ฒƒ โ€ข ํ™•์žฅ๋œ ์ •์ฑ…, ๋ฃฐ ๊ทธ๋ฆฌ๊ณ  ๋ฐ์ดํ„ฐ๋ฅผ ์ €์žฅํ•ด์„œ ๋‹ค ์–‘ํ•œ ๋ถ„์•ผ์—์„œ ํ™œ์šฉ
  25. 25. PAG Platform Advisory Group Bitcoin is Programble Money {"hash":"7c4025...", "ver":1, "vin_sz":1, "vout_sz":1, "lock_time":0, "size":224, "in":[ {"prev_out": {"hash":"2007ae...", "n":0}, "scriptSig":"304502... 042b2d..."}], "out":[ {"value":"0.31900000", "scriptPubKey":"OP_DUP OP_HASH160 a7db6f OP_EQUALVERIFY OP_CHECKSIG"}]} SCRIPT SYSTEM
  26. 26. PAG Platform Advisory Group ์‘์šฉ ๋ถ„์•ผ โ€ข Cryptocurrency โ€ข Bitcoin, BitShare, Altcoin โ€ข Registry , Open ID โ€ข DNS โ€ข Onename โ€ข Cloud Storage โ€ข Messaging โ€ข Reddit Style โ€ข Twitter Style โ€ข IoT โ€ข M2M , Registration, S/W Upgrade โ€ข Energy Management / Energy Payment โ€ข Game โ€ข SNS โ€ข Electric Voting System โ€ข Reputation โ€ข P2P Marketplace
  27. 27. PAG Platform Advisory Group Sidechain It lays down the conceptual foundations of an ecosystem of โ€œsidechainsโ€ separate from the main Bitcoin blockchain but interoperable with it.
  28. 28. PAG Platform Advisory Group Bitshares : Exchange Market
  29. 29. PAG Platform Advisory Group STORJ.IO : Cloud Storage
  30. 30. PAG Platform Advisory Group ONENAE: Open Identity
  31. 31. PAG Platform Advisory Group .BIT : DNS
  32. 32. PAG Platform Advisory Group Ethereum Next-Generation Smart Contract and Decentralized Application Platform
  33. 33. PAG Platform Advisory Group Ethereum Script System ํ™•์žฅํ•ด์„œ ๋ถ„์‚ฐ ์–ดํ”Œ๋ฆฌ์ผ€์ด์…˜(Dapps) ์„ ๋งŒ๋“ค ์ˆ˜ ์žˆ๋Š” ํ”„๋กœ๊ทธ๋ž˜๋ฐ์–ธ์–ด์™€ ํ™˜๊ฒฝ์„ ์ œ๊ณตํ•ด์ฃผ๋Š” ํ”Œ๋žซ ํผ โ€ข EVM (Ethereum Virtual Machine) โ€ข Contract / Transaction ์ฒ˜๋ฆฌ โ€ข EtherBrowser โ€ข ํ†ตํ•ฉ UI โ€ข Swarm โ€ข P2P File Storage โ€ข Whisper โ€ข P2P Messaging Protocol General-Purpose cryptocurrency network / platform
  34. 34. PAG Platform Advisory Group ๋œฌ๊ธˆ์—†์ด IoT ๋กœ โ€ฆ ?!
  35. 35. ADEPTAutonomous Decentralized Peer-to-Peer Telemetry Blockchain of Things Internet of Things
  36. 36. PAG Platform Advisory Group ADEPT โ€ข ์ถœ์ฒ˜: http://www.zdnet.co.kr/news/news_view.asp?artice_id=20140915150640 โ€ข ๋ถ„์‚ฐ๋œ P2P ์‹œ์Šคํ…œ์€ ๋งค์šฐ ์ ์€ ๋น„์šฉ๊ณผ, ํ”„๋ผ์ด๋ฒ„์‹œ ๋ณดํ˜ธ, ์žฅ๊ธฐ ์ง€์†์„ฑ ๋“ฑ ์„ ๊ฐ€๋Šฅ์ผ€ ํ•œ๋‹ค"๋ฉฐ "๋ณต์žกํ•œ ๋„คํŠธ์›Œํฌ ์†”๋ฃจ์…˜์ด๋‚˜ ๋Œ€๊ทœ๋ชจ ์ƒํƒœ๊ณ„๋ฅผ ๊ตฌ์ถ•ํ•˜ ๋Š” ๊ฒƒ๋ณด๋‹ค ์˜๋ฏธ์žˆ๋Š” ์‚ฌ์šฉ์ž๊ฒฝํ—˜์„ ์„ค๊ณ„ํ•  ์ˆ˜ ์žˆ๋‹ค โ€ข ์ค‘์•™์ง‘์ค‘ํ™”๋œ ์ธํ”„๋ผ๋ฅผ ๊ธฐ๊ธฐ ์ œ์กฐ์‚ฌ๊ฐ€ ๋ณ„๋„๋กœ ๊พธ๋ฆฌ์ง€ ์•Š์•„๋„ ๋˜๊ณ , IoT ํ†ต์‹ ์„ ์œ„ํ•œ ๊ณ ์„ฑ๋Šฅ ๋„คํŠธ์›Œํฌ ์ธํ”„๋ผ๋ฅผ ์ผ๋ฐ˜์†Œ๋น„์ž์™€ ๊ธฐ์—…, ์„œ๋น„์Šค์—…์ฒด ๋ชจ๋‘๊ฐ€ ๊ตฌ์ถ•ํ•˜์ง€ ์•Š์•„๋„ ๋œ๋‹ค. โ€ข IBM, ์‚ผ์„ฑ์ „์ž, Ethereum
  37. 37. PAG Platform Advisory Group Beyond centralized IoT Cloud ์ถœ์ฒ˜: IBM Device Democracy
  38. 38. PAG Platform Advisory Group Why IoT need Blockchain technology? ์ˆ˜๋งŽ์€ ๋””๋ฐ”์ด์Šค์˜ ๋ฐ์ดํ„ฐ๋ฅผ ์ฒ˜๋ฆฌํ•˜๋Š” ๋ฐ์—๋Š” ํ•œ๊ณ„์™€ ๋งŽ์€ ๋น„์šฉ์ด ๋“ ๋‹ค
  39. 39. PAG Platform Advisory Group Why IoT need Blockchain technology? ๊ตฌ์กฐ์ ์œผ๋กœ๋Š” P2P ์•„ํ‚คํ…์ณ๊ฐ€ ์ด์ƒ์ ์ด๋‚˜ ์ปค๋ฎค๋‹ˆ์ผ€์ด์…˜ ๋น„์šฉ์ด ๋“ ๋‹ค. ์ด๊ฒƒ ์—ญ์‹œ ํ•ด๊ฒฐํ•ด์•ผ ํ•  ๊ธฐ์ˆ ์  ๊ณผ์ œ์ค‘ ํ•˜๋‚˜์ด๋‹ค.
  40. 40. PAG Platform Advisory Group The Blockchain is the core innovation We want a whole sequence of companies: digital title, digital media assets, digital stocks and bonds, digital crowdfunding, digital insurance. If you have online trust like the blockchain provides, you can reinvent field after field after field. ๋งˆํฌ ์—”๋”์Šจ
  41. 41. PAG Platform Advisory Group Distruptive Technology IoT / P2P Marketplace Enabler ์ œ๋ ˆ๋ฏธ ๋ฆฌํ”„ํ‚จ
  42. 42. PAG Platform Advisory Group ์ฐธ๊ณ ์ž๋ฃŒ http://www.slideshare.net/lablogga/blockchain-the-information-technology-of-the-future

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