ブロックチェーンの仕組み・応用と課題 / How Blockchains Work, Their Applications and Problems

2017年6月22日(木)、日本セキュリティ監査協会の研究会にて講演した際に用いたスライドです。

Transcript

1. ∼ ∼ SFC ks91@sfc.wide.ad.jp — 2017-06-22 – p.1/27
2. ( ) SFC ( ) CSO (Chief Science Officer) CEO 1993 M.Eng ( ) 2006 ( ) SFC 16 P2P 2011 → ( ) — 2017-06-22 – p.2/27
3. (by Satoshi Nakamoto) Satoshi ( ) (block; , ) ← (chain; ) ← — 2017-06-22 – p.3/27
4. ( ) P2P ( ) (double spending) ⇒ ( ) ← — 2017-06-22 – p.4/27
5. /DLT(Distributed Ledger Technology) ( ) Bitcoin ( ) Open Assets Protocol (OAP) ( ) Ethereum ( ) Enterprise Ethereum Alliance (↓ ) ( ) Hyperledger (Linux Foundation) Fabric (IBM), Sawtooth (Intel), Iroha ( ) Corda (R3) — 2017-06-22 – p.5/27
6. ( ) 1. 10 ( ) 2. 3. 1 — 2017-06-22 – p.6/27
7. SHA-256 × SHA-256 → TX SHA-256 × RIPEMD-160 → ECDSA (secp256k1) — 2017-06-22 – p.7/27
8. /DLT End-to-End ( ) ( ) — 2017-06-22 – p.8/27
9. ( / ) EVM ( ) EVM (Ethereum Virtual Machine) Gas ( CPU ) — 2017-06-22 – p.9/27
10. — 2017-06-22 – p.10/27
11. (Hyperledger ) ( ) ( ) ( ) IoT / / ( ) — 2017-06-22 – p.11/27
12. : . . . : Proof of Existence, Everledger, Factom, . . . (OP_RETURN ) ( ) ( ) — 2017-06-22 – p.12/27
13. ( KVS DHT) — 2017-06-22 – p.13/27
14. — 2017-06-22 – p.14/27
15. (2014.2-2016.1) : 2 . . . — 2017-06-22 – p.15/27
16. vs. — 2017-06-22 – p.16/27
17. The DAO ( ) The DAO Split ( ) 360 ETH (50∼60 ) (2016/6/17) ( → ) ( → ; ) ( ) (2016/7/20 ) — 2017-06-22 – p.17/27
18. — 2017-06-22 – p.18/27
19. : ⇒ ⇒ — 2017-06-22 – p.19/27
20. Ether Ether Ether . . . BTC Everledger, Factom OAP ⇒ — 2017-06-22 – p.20/27
21. 3 1. ( : UTXO ) ⇒ ( ) 2. ( : ) ⇒ 3. ( : ) TX ⇒ 2 3 — 2017-06-22 – p.21/27
22. /DLT — 2017-06-22 – p.22/27
23. ( ) (by ) (since 1984) ( ) ( ) ( ) . . . ( ) ⇒ . . . — 2017-06-22 – p.23/27
24. ( ) ( ) ( ) ( ) ( ) (by ) — 2017-06-22 – p.24/27
25. ( ) / / — 2017-06-22 – p.25/27
26. — 1. ( ) 2. ( ) 3. ( ) — 2017-06-22 – p.26/27
27. ( ) — 2017-06-22 – p.27/27