ブロックチェーンでは何もできない 〜ではこの騒ぎは何なのか、どこに知恵を絞るのか〜 / You cannot do Anything Serious with Blockchains, Unless...

2016年10月24日(月)、富山市にてインテックさま主催で開催された、地域での応用に向けたブロックチェーンの研究会にてお話した際のスライドです。半ギレのタイトルですみません。

Transcript

1. ∼ ∼ SFC ks91@sfc.wide.ad.jp ∼ ∼ – 2016-10-24 – p.1/40
2. ( ) SFC ( ) CSO (Chief Science Officer) 1988∼1997 ( ) 1993 M.Eng ( ) 2006 ( ) SFC 15 P2P ⇒ ∼ ∼ – 2016-10-24 – p.2/40
3. (exponential) ∼ ∼ – 2016-10-24 – p.3/40
4. ∼ ∼ – 2016-10-24 – p.4/40
5. 5 . . . ∼ ∼ – 2016-10-24 – p.5/40
6. (1) ⇓ ← . . . = (oneness) ∼ ∼ – 2016-10-24 – p.6/40
7. (2) ← ⇑ ← “OP_RETURN” ( ) . . . ⇒ ∼ ∼ – 2016-10-24 – p.7/40
8. (3) . . . . . . ∼ ∼ – 2016-10-24 – p.8/40
9. ∼ ∼ – 2016-10-24 – p.9/40
10. ( ) ( ) ← (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) ∼ ∼ – 2016-10-24 – p.10/40
11. P2P ( ) (double spending) ⇒ ( ) ( ) ∼ ∼ – 2016-10-24 – p.11/40
12. ∼ ∼ – 2016-10-24 – p.12/40
13. RSA, DSA, ECDSA ( DSA) ( RSA) PKI ∼ ∼ – 2016-10-24 – p.13/40
14. ( ) 1. 10 ( ) 2. 3. 1 ∼ ∼ – 2016-10-24 – p.14/40
15. Proof of Work . . . : Hashcash (1997) SHA-1 20 ( ) 0 1 1 / ∼ ∼ – 2016-10-24 – p.15/40
16. ( ) ∼ ∼ – 2016-10-24 – p.16/40
17. ( ) ∼ ∼ – 2016-10-24 – p.17/40
18. POW Proof Of Work ( ) . . . ∼ ∼ – 2016-10-24 – p.18/40
19. (2016 1 ) 2 ∼ ∼ – 2016-10-24 – p.19/40
20. : End-to-End ( ) ( ) ∼ ∼ – 2016-10-24 – p.20/40
21. ∼ ∼ – 2016-10-24 – p.21/40
22. (Hyperledger ) ( ) ( ) ( ) IoT / / ( ) ∼ ∼ – 2016-10-24 – p.22/40
23. : . . . : Proof of Existence ( ) : ∼ ∼ – 2016-10-24 – p.23/40
24. vs. ∼ ∼ – 2016-10-24 – p.24/40
25. OS ∼ ∼ – 2016-10-24 – p.25/40
26. ∼ ∼ – 2016-10-24 – p.26/40
27. : (1600) (1865) ∼ ∼ – 2016-10-24 – p.27/40
28. DAO Distributed/Decentralized Autonomous Organization - : . . . ∼ ∼ – 2016-10-24 – p.28/40
29. OS (2007) ∼ ∼ – 2016-10-24 – p.29/40
30. OS NPO/NGO ∼ ∼ – 2016-10-24 – p.30/40
31. . . . ∼ ∼ – 2016-10-24 – p.31/40
32. (Ethereum) Vitalik Buterin, “Ethereum White Paper: A NEXT GENERATION SMART CONTRACT & DECENTRALIZED APPLICATION PLATFORM” : ∼ ∼ – 2016-10-24 – p.32/40
33. OS ∼ ∼ – 2016-10-24 – p.33/40
34. Uber ∼ ∼ – 2016-10-24 – p.34/40
35. Uber Uber ∼ ∼ – 2016-10-24 – p.35/40
36. ∼ ∼ – 2016-10-24 – p.36/40
37. The DAO ( ) The DAO Split ( ) 360 ETH (50∼60 ) (6/17) ( ) ( ; ) (7/20 ) ∼ ∼ – 2016-10-24 – p.37/40
38. : ⇒ ∼ ∼ – 2016-10-24 – p.38/40
39. 3 1. ( ) ⇒ ( ) 2. ( ) ⇒ 3. ( ) TX ⇒ ∼ ∼ – 2016-10-24 – p.39/40
40. ( ) ∼ ∼ – 2016-10-24 – p.40/40