ブロックチェーン ─ 現状と可能性・不可能性、産業界へのインパクト / Blockchains now, possibilities, impossibilities and industrial impacts

2016年11月21日(月)、JEITA ((社)電子情報技術産業協会) ソフトウェアエンジニアリング技術専門委員会での講演で用いたスライドです。

Transcript

1. SFC
   ks91@sfc.wide.ad.jp
   — — 2016-11-21 – p.1/41
   

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2. ( )
   SFC ( )
   CSO (Chief Science Officer)
   1988∼1997 ( )
   1993 M.Eng ( )
   2006 ( )
   SFC 15
   P2P
   ⇒
   — — 2016-11-21 – p.2/41
   

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3. 1.
   2.
   3.
   4.
   5.
   6.
   — — 2016-11-21 – p.3/41
   

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4. 1.
   — — 2016-11-21 – p.4/41
   

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5. ( ) ( )
   ← (TX)
   (TX) ← ( : )
   ( )
   “A timestamp server works by taking a hash of a block of items to be timestamped and
   widely publishing the hash, such as in a newspaper or Usenet post”
   “To implement a distributed timestamp server on a peer-to-peer basis, we will need to use a
   proof-of-work system similar to Adam Back’s Hashcash, rather than newspaper or Usenet
   posts”
   — Satoshi Nakamoto (2008)
   — — 2016-11-21 – p.5/41
   

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6. P2P
   ( )
   (double spending)
   ⇒ ( ) ( )
   — — 2016-11-21 – p.6/41
   

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7. 2.
   — — 2016-11-21 – p.7/41
   

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8. — — 2016-11-21 – p.8/41
   

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9. RSA, DSA, ECDSA ( DSA) ( RSA)
   PKI
   — — 2016-11-21 – p.9/41
   

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10. 3.
    (Proof Of Work)
    — — 2016-11-21 – p.10/41
    

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11. ( )
    1. 10 ( )
    2.
    3. 1
    — — 2016-11-21 – p.11/41
    

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12. End-to-End
    ( ) ( )
    — — 2016-11-21 – p.12/41
    

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13. Proof of Work
    . . .
    : Hashcash (1997)
    SHA-1 20 ( ) 0
    1 1
    /
    — — 2016-11-21 – p.13/41
    

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14. ( )
    — — 2016-11-21 – p.14/41
    

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15. ( )
    — — 2016-11-21 – p.15/41
    

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16. POW
    Proof Of Work ( )
    . . .
    — — 2016-11-21 – p.16/41
    

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17. 2016 1 2
    — — 2016-11-21 – p.17/41
    

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18. vs.
    — — 2016-11-21 – p.18/41
    

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19. 4.
    —
    — — 2016-11-21 – p.19/41
    

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20. (Hyperledger )
    ( )
    ( )
    ( )
    IoT
    / /
    ( )
    — — 2016-11-21 – p.20/41
    

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21. :
    . . .
    : Proof of Existence
    ( )
    :
    — — 2016-11-21 – p.21/41
    

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22. — — 2016-11-21 – p.22/41
    

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23. :
    (1600)
    (1865)
    — — 2016-11-21 – p.23/41
    

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24. DAO ( )
    Distributed Autonomous Organization
    -
    :
    . . .
    — — 2016-11-21 – p.24/41
    

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25. OS (2007)
    — — 2016-11-21 – p.25/41
    

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26. OS
    NPO/NGO
    — — 2016-11-21 – p.26/41
    

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27. (Ethereum)
    Vitalik Buterin, “Ethereum White Paper: A NEXT GENERATION SMART
    CONTRACT & DECENTRALIZED APPLICATION PLATFORM”
    :
    DAO
    — — 2016-11-21 – p.27/41
    

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28. The DAO ( )
    “The DAO”
    Split ( ) 360 ETH (50∼60 ) (6/17)
    ( )
    ( ; )
    (7/20 )
    — — 2016-11-21 – p.28/41
    

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29. 5.
    — — 2016-11-21 – p.29/41
    

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30. BTC
    ( )
    ← “OP_RETURN”
    . . .
    Segregated Witness —
    Lightning Network —
    — — 2016-11-21 – p.30/41
    

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31. & ← “OP_RETURN”
    Everledger —
    Factom —
    Storj ( ) — P2P
    — — 2016-11-21 – p.31/41
    

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32. NEM (New Economy Movement)
    — — 2016-11-21 – p.32/41
    

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33. Chain
    NASDAQ
    eris
    mijin
    NEM
    Orb 1
    — — 2016-11-21 – p.33/41
    

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34. (Hyperledger )
    ( )
    ( )
    ( )
    ( )
    IoT
    / /
    ( )
    — — 2016-11-21 – p.34/41
    

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35. ( )
    ( )
    — — 2016-11-21 – p.35/41
    

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36. Hyperledger
    Linux Foundation
    Fabric : IBM DAH
    Sawtooth Lake : Intel
    Iroha :
    Corda : R3 ( )
    — — 2016-11-21 – p.36/41
    

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37. Corda
    Corda :
    :
    — — 2016-11-21 – p.37/41
    

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38. Corda
    +
    CAP
    — — 2016-11-21 – p.38/41
    

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39. 6.
    — — 2016-11-21 – p.39/41
    

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40. –
    Satoshi Nakamoto
    ⇓
    ←
    ⇑
    ← “OP_RETURN”
    ⇒
    — — 2016-11-21 – p.40/41
    

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41. –
    3
    1. ( )
    ⇒ ( )
    2. ( )
    ⇒
    3. ( )
    TX ⇒
    ( )
    — — 2016-11-21 – p.41/41
    

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