ブロックチェーンの可能性と不可能性 / Possibilities and Impossibilities of Blockchains

2016年9月30日(金)、「オルトプラスラボ Tech セミナー2016 Fall」にてお話した際のスライドです。

1. Tech 2016 Fall SFC ks91@sfc.wide.ad.jp – 2016-09-30 – p.1/16
2. ( ) (ks91@sfc.wide.ad.jp) SFC ( ) CSO (Chief Science Officer) 1988∼1997 ( ) 1993 M.Eng (CS) 2006 ( ) SFC 15 P2P ⇒ – 2016-09-30 – p.2/16
3. – 2016-09-30 – p.3/16
4. ( ) ( ) ← (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) – 2016-09-30 – p.4/16
5. ( ) 1. 10 ( ) 2. 3. 1 – 2016-09-30 – p.5/16
6. : End-to-End ( ) ( ) – 2016-09-30 – p.6/16
7. – 2016-09-30 – p.7/16
8. (Hyperledger ) ( ) ( ) ( ) IoT / / ( ) – 2016-09-30 – p.8/16
9. : . . . : Proof of Existence ( ) : – 2016-09-30 – p.9/16
10. vs. – 2016-09-30 – p.10/16
11. – 2016-09-30 – p.11/16
12. The DAO ( ) The DAO Split ( ) 360 ETH (50∼60 ) (6/17) ( ) ( ; ) (7/20 ) – 2016-09-30 – p.12/16
13. : ⇒ – 2016-09-30 – p.13/16
14. 3 1. ( ) ⇒ ( ) 2. ( ) ⇒ 3. ( ) TX ⇒ – 2016-09-30 – p.14/16
15. – Satoshi Nakamoto ⇓ ← ⇑ ← “OP_RETURN” ⇒ – 2016-09-30 – p.15/16
16. ( ) ⇒ ( ) – 2016-09-30 – p.16/16