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デジタル通貨の17年とこれから / 17 Years of Digital Currencies and Thereafter

デジタル通貨の17年とこれから / 17 Years of Digital Currencies and Thereafter

2016年9月12日、データエクスチェンジコンソーシアム 2016年度第3回全体会にてお話した際のスライドです。

Kenji Saito
PRO

September 12, 2016
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  1. i-WAT Trust Model Geek Credit/Ripple Trust Model * 2005 Ripple

    17 SFC ks91@sfc.wide.ad.jp 17 — 2016-09-12 – p.1/31
  2. ( ) SFC ( ) CSO (Chief Science Officer) 1988∼1997

    ( ) 1993 M.Eng (CS) 2006 ( ) SFC 15 P2P ⇒ 17 — 2016-09-12 – p.2/31
  3. 17 17 2000 IOU → 17 — 2016-09-12 – p.3/31

  4. ( ) 2000 Blind signature (1983) Magic Money (1990s) Hashcash

    (1997) 2000∼2006 MojoNation (2000), Karma (2003) Samsara (2003), PPay (2003), i-WAT (2003) Ripple ( ) 2007∼2016 SSC (2008) Bitcoin (2008), (altcoins), Ethereum (2014) 17 — 2016-09-12 – p.4/31
  5. 1 : (17∼19 ) 2 : ( ) (1930 )

    Wörgl 17 — 2016-09-12 – p.5/31
  6. 2000 Blind signature (1983) Magic Money (1990s) Blind signature PGP

    Pr0duct Cypher Hashcash (1997) Proof Of Work Bitcoin : 17 — 2016-09-12 – p.6/31
  7. - 17 — 2016-09-12 – p.7/31

  8. - RSA, DSA, ECDSA ( DSA) ( RSA) 17 —

    2016-09-12 – p.8/31
  9. Blind Signature ( ) 1. “ ” A 2. A

    B 3. B “ ” DigiCash (1990) “On blind signatures and perfect crimes” (1992) 17 — 2016-09-12 – p.9/31
  10. Hashcash CPU : X-Hashcash: 1:20:060408:adam@cypherspace.org::1QTjaYd7niiQA/sc:ePa SHA-1 20 ( ) 0

    1 1 Bitcoin 17 — 2016-09-12 – p.10/31
  11. 2000∼2006 ( ) MojoNation (2000) Karma (2003) DHT Samsara (2003)

    PPay (2003), i-WAT (2003) IOU Ripple ( ) : P2P P2P 17 — 2016-09-12 – p.11/31
  12. DHT (Distributed Hash Table) / < , > + <

    , > < , > 17 — 2016-09-12 – p.12/31
  13. Samsara a) Storing a claim Data owned by x Storage

    claim by x b) Forwarding the claim c) Finding a cycle (a) (b) (a) (b) (c) (a) (b) (c) (a) (b) (c) B X B C B C B C A a x a a a 17 — 2016-09-12 – p.13/31
  14. i-WAT 17 — 2016-09-12 – p.14/31

  15. i-WAT 17 — 2016-09-12 – p.14/31

  16. i-WAT 17 — 2016-09-12 – p.14/31

  17. ROT (Reduction Over Time) (2005 ) 17 — 2016-09-12 –

    p.15/31
  18. Ripple Ripple path A C A B B C A→B→C

    ripple path XRP (Ripple credits) 17 — 2016-09-12 – p.16/31
  19. 2007∼2016 ( ) SSC (2008) Samsara + i-WAT Bitcoin (2008),

    (altcoins), Ethereum (2014) / : 17 — 2016-09-12 – p.17/31
  20. 17 — 2016-09-12 – p.18/31

  21. 1. 10 ( ) 2. 3. 1 17 — 2016-09-12

    – p.19/31
  22. Ethereum ( ) ( ) Ether 17 — 2016-09-12 –

    p.20/31
  23. Ether Ethereum EOA : Externally-Owned Account Ether EVM EVM 17

    — 2016-09-12 – p.21/31
  24. EVM : Ethereum Virtual Machine Gas ( ) 17 —

    2016-09-12 – p.22/31
  25. Ethereum P2P ( ) 17 — 2016-09-12 – p.23/31

  26. B A D E H I G C F -

    A modest number of malicious nodes eclipse correct nodes from each other's view 17 — 2016-09-12 – p.24/31
  27. The DAO ( ) The DAO Split ( ) 360

    ETH (50∼60 ) (6/17) ( ) ( ; ) (7/20 ) 17 — 2016-09-12 – p.25/31
  28. P2P Kademlia (DHT ) 4 ID k = 2 0110

    0∼2 ( ) 17 — 2016-09-12 – p.26/31
  29. IOU → → → 17 — 2016-09-12 – p.27/31

  30. IOU 17 — 2016-09-12 – p.28/31

  31. IOU 17 — 2016-09-12 – p.29/31

  32. 17 — 2016-09-12 – p.30/31

  33. ×× ×× 17 — 2016-09-12 – p.31/31