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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

Kenji Saito
September 12, 2016

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

September 12, 2016
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  1. ( ) SFC ( ) CSO (Chief Science Officer) 1988∼1997

    ( ) 1993 M.Eng (CS) 2006 ( ) SFC 15 P2P ⇒ 17 — 2016-09-12 – p.2/31
  2. ( ) 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
  3. 1 : (17∼19 ) 2 : ( ) (1930 )

    Wörgl 17 — 2016-09-12 – p.5/31
  4. 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
  5. 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
  6. 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
  7. DHT (Distributed Hash Table) / < , > + <

    , > < , > 17 — 2016-09-12 – p.12/31
  8. 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
  9. Ripple Ripple path A C A B B C A→B→C

    ripple path XRP (Ripple credits) 17 — 2016-09-12 – p.16/31
  10. 2007∼2016 ( ) SSC (2008) Samsara + i-WAT Bitcoin (2008),

    (altcoins), Ethereum (2014) / : 17 — 2016-09-12 – p.17/31
  11. 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
  12. The DAO ( ) The DAO Split ( ) 360

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

    0∼2 ( ) 17 — 2016-09-12 – p.26/31