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
2. ( ) SFC ( ) CSO (Chief Science Officer) 1988∼1997 ( ) 1993 M.Eng ( ) 2006 ( ) SFC 15 P2P ⇒ — — 2016-11-21 – p.2/41
3. 1. 2. 3. 4. 5. 6. — — 2016-11-21 – p.3/41
4. 1. — — 2016-11-21 – p.4/41
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
6. P2P ( ) (double spending) ⇒ ( ) ( ) — — 2016-11-21 – p.6/41
7. 2. — — 2016-11-21 – p.7/41
8. — — 2016-11-21 – p.8/41
9. RSA, DSA, ECDSA ( DSA) ( RSA) PKI — — 2016-11-21 – p.9/41
10. 3. (Proof Of Work) — — 2016-11-21 – p.10/41
11. ( ) 1. 10 ( ) 2. 3. 1 — — 2016-11-21 – p.11/41
12. End-to-End ( ) ( ) — — 2016-11-21 – p.12/41
13. Proof of Work . . . : Hashcash (1997) SHA-1 20 ( ) 0 1 1 / — — 2016-11-21 – p.13/41
14. ( ) — — 2016-11-21 – p.14/41
15. ( ) — — 2016-11-21 – p.15/41
16. POW Proof Of Work ( ) . . . — — 2016-11-21 – p.16/41
17. 2016 1 2 — — 2016-11-21 – p.17/41
18. vs. — — 2016-11-21 – p.18/41
19. 4. — — — 2016-11-21 – p.19/41
20. (Hyperledger ) ( ) ( ) ( ) IoT / / ( ) — — 2016-11-21 – p.20/41
21. : . . . : Proof of Existence ( ) : — — 2016-11-21 – p.21/41
22. — — 2016-11-21 – p.22/41
23. : (1600) (1865) — — 2016-11-21 – p.23/41
24. DAO ( ) Distributed Autonomous Organization - : . . . — — 2016-11-21 – p.24/41
25. OS (2007) — — 2016-11-21 – p.25/41
26. OS NPO/NGO — — 2016-11-21 – p.26/41
27. (Ethereum) Vitalik Buterin, “Ethereum White Paper: A NEXT GENERATION SMART CONTRACT & DECENTRALIZED APPLICATION PLATFORM” : DAO — — 2016-11-21 – p.27/41
28. The DAO ( ) “The DAO” Split ( ) 360 ETH (50∼60 ) (6/17) ( ) ( ; ) (7/20 ) — — 2016-11-21 – p.28/41
29. 5. — — 2016-11-21 – p.29/41
30. BTC ( ) ← “OP_RETURN” . . . Segregated Witness — Lightning Network — — — 2016-11-21 – p.30/41
31. & ← “OP_RETURN” Everledger — Factom — Storj ( ) — P2P — — 2016-11-21 – p.31/41
32. NEM (New Economy Movement) — — 2016-11-21 – p.32/41
33. Chain NASDAQ eris mijin NEM Orb 1 — — 2016-11-21 – p.33/41
34. (Hyperledger ) ( ) ( ) ( ) ( ) IoT / / ( ) — — 2016-11-21 – p.34/41
35. ( ) ( ) — — 2016-11-21 – p.35/41
36. Hyperledger Linux Foundation Fabric : IBM DAH Sawtooth Lake : Intel Iroha : Corda : R3 ( ) — — 2016-11-21 – p.36/41
37. Corda Corda : : — — 2016-11-21 – p.37/41
38. Corda + CAP — — 2016-11-21 – p.38/41
39. 6. — — 2016-11-21 – p.39/41
40. – Satoshi Nakamoto ⇓ ← ⇑ ← “OP_RETURN” ⇒ — — 2016-11-21 – p.40/41
41. – 3 1. ( ) ⇒ ( ) 2. ( ) ⇒ 3. ( ) TX ⇒ ( ) — — 2016-11-21 – p.41/41