ブロックチェーン 2.0 / Blockchain 2.0

ブロックチェーンハブ主催で開催しているブロックチェーン基盤技術講義『ブロックチェーン 2.0』のスライドです。2017年7月12日(水) に使用しました。

Transcript

1. 2.0 SFC / CSO ks91@sfc.wide.ad.jp 2.0 — — 2017-07-12 – p.1/39
2. ( ) SFC ( ) CSO (Chief Science Officer) CEO 1993 M.Eng ( ) 2006 ( ) SFC 16 P2P 2011 → ( ) 2.0 — — 2017-07-12 – p.2/39
3. / Segregated Witness Proof of Stake 2.0 — — 2017-07-12 – p.3/39
4. 2.0 1. 2. Segregated Witness 3. 4. Proof of Stake ( ) 5. 6. 2.0 — — 2017-07-12 – p.4/39
5. 1. 2.0 — — 2017-07-12 – p.5/39
6. BTC / . . . 2.0 — — 2017-07-12 – p.6/39
7. EPOBC (Open Assets) OP_RETURN 2.0 — — 2017-07-12 – p.7/39
8. Open Assets Protocol (OAP) ( = ) 2.0 — — 2017-07-12 – p.8/39
9. ID ID (asset ID) 1. 2. 3. 160 = ID ( ) 4. base58check ‘A’ ( = 23) (asset quantity) BTC 2.0 — — 2017-07-12 – p.9/39
10. OP_RETURN PUSH 0x4f41 (‘OA’) = 2 0x0100 2 1∼9 LEB128 1∼9 2.0 — — 2017-07-12 – p.10/39
11. 2.0 — — 2017-07-12 – p.11/39
12. 2. Segregated Witness ( = ) (malleability) 2.0 — — 2017-07-12 – p.12/39
13. (witness) 2.0 — — 2017-07-12 – p.13/39
14. OP_RETURN PUSH 0xaa21a9ed 4 (witness) SHA-256 32 Merkle 2.0 — — 2017-07-12 – p.14/39
15. (1) P2WPKH (version 0) (pay-to-(witnessed)-public-key-hash) witness ( ): < > < > scriptSig ( ): scriptPubKey ( ) 0 <20-byte > 20-byte < > < > CHECKSIG 2.0 — — 2017-07-12 – p.15/39
16. (2) P2WSH (version 0) (pay-to-(witnessed)-script-hash) witness: < 1 > <1 < 1 > < 2 > 2 CHECKMULTISIG> scriptSig: scriptPubKey 0 <32-byte > 32-byte 1-out-of-2 2.0 — — 2017-07-12 – p.16/39
17. SegWit 2016 100 SegWit (95% ) . . . 2.0 — — 2017-07-12 – p.17/39
18. . . . Litecoin Monacoin SegWit . . . 2.0 — — 2017-07-12 – p.18/39
19. 3. 2.0 — — 2017-07-12 – p.19/39
20. BIP (Bitcoin Improvement Proposal) ex. BIP 1 : BIP Purposes and Guidelines https://github.com/bitcoin/bips/blob/master/bip-0001.mediawiki ex. BIP 9 : Version bits with timeout and delay ex. BIP 141 : Segregated Witness (Consensus layer) TCP/IP RFC XMPP XEP 2.0 — — 2017-07-12 – p.20/39
21. Block Header Data Structure Field Description Size (bytes) Version 4 Digest Double SHA-256 value 32 Merkle root Double SHA-256 value 32 Time Seconds (since 1970-01-01T00:00 UTC) 4 Target Compressed format 4 Nonce Appropriate value 4 Merkle root is the digest of all TXs 2.0 — — 2017-07-12 – p.21/39
22. BIP 9 SegWit https://github.com/bitcoin/bips/blob/master/bip-0009/assignments.mediawiki MTP : Median Time Past ( 11 ) 2.0 — — 2017-07-12 – p.22/39
23. 4. Proof of Stake ( ) 2.0 — — 2017-07-12 – p.23/39
24. Proof of Stake ( ) ( ) 2.0 — — 2017-07-12 – p.24/39
25. Proof of Stake Hn (PD + id + t + . . .) ≤ 2n × balance d H n : n (ex. SHA-256 (n = 256)) PD : id : (ex. ) t : (ex. UNIX ( )) balance : d : (ex. ) PoW 2.0 — — 2017-07-12 – p.25/39
26. Proof of Stake 3 1. 2. “Nothing at Stake” 3. 51% 2.0 — — 2017-07-12 – p.26/39
27. : Proof of Stake Velocity Reddcoin 2.0 — — 2017-07-12 – p.27/39
28. Nothing at Stake - = 2.0 — — 2017-07-12 – p.28/39
29. Nothing at Stake - 100% Proof of Stake 2.0 — — 2017-07-12 – p.29/39
30. 51% 2.0 — — 2017-07-12 – p.30/39
31. 5. . . . 2.0 — — 2017-07-12 – p.31/39
32. 2.0 — — 2017-07-12 – p.32/39
33. 2.0 — — 2017-07-12 – p.33/39
34. → ⇒ A. Back, et. al., “Enabling Blockchain Innovations with Pegged Sidechains”, 2014 2.0 — — 2017-07-12 – p.34/39
35. 6. 2.0 — — 2017-07-12 – p.35/39
36. 1 1 10 2 2.0 — — 2017-07-12 – p.36/39
37. A-B 2.0 — — 2017-07-12 – p.37/39
38. 2 2 ( ) Ripple Path 2.0 — — 2017-07-12 – p.38/39
39. 2.0 — — 2017-07-12 – p.39/39