スマートコントラクト / Smart Contracts

2018年4月25日(水)、ブロックチェーンハブ主催で開催されたブロックチェーンアカデミー「スマートコントラクト」(ブロックチェーン基盤技術【トークンの設計からシェアリングエコノミーまで】) にて使用したスライドです。

Transcript

1. CSO / SFC ks91@blockchainhub.co.jp — — 2018-04-25 – p.1/41
2. ( ) SFC ( ) CSO (Chief Science Officer) 1993 ( ) 2006 ( ) SFC 17 P2P (Peer-to-Peer) 2011 → ( ) — — 2018-04-25 – p.2/41
3. — — 2018-04-25 – p.3/41
4. — — 2018-04-25 – p.4/41
5. — — 2018-04-25 – p.5/41
6. ↑ . . . — — 2018-04-25 – p.6/41
7. vs. — — 2018-04-25 – p.7/41
8. 1. ⇒ ( ) ⇒ 2. ⇒ ⇒ 3. ⇒ — — 2018-04-25 – p.8/41
9. (by ) 1. 2. ( ) ( ) . . . cf. by McLuhan cf. by McLuhan — — 2018-04-25 – p.9/41
10. ⇒ : ⇒ — — 2018-04-25 – p.10/41
11. ⇒ : ⇒ — — 2018-04-25 – p.11/41
12. (Ethereum) ( ) EVM (Ethereum Virtual Machine) — — 2018-04-25 – p.12/41
13. Vitalik Buterin, “Ethereum White Paper: A NEXT GENERATION SMART CONTRACT & DECENTRALIZED APPLICATION PLATFORM” 15 — — 2018-04-25 – p.13/41
14. = run — — 2018-04-25 – p.14/41
15. Ether Ethereum EOA : Externally-Owned Account Ether EVM EVM — — 2018-04-25 – p.15/41
16. EVM : Ethereum Virtual Machine Gas — — 2018-04-25 – p.16/41
17. — — 2018-04-25 – p.17/41
18. EVM : . . . : Solidity — JavaScript LLL — Lisp — — 2018-04-25 – p.18/41
19. Solidity ( ) pragma solidity ˆ0.4.8; contract IndivisibleAsset { /* */ string public _name; string public _symbol; uint256 public _quantity; address public _owner; function IndivisibleAsset(string name, string symbol, uint256 quantity) { _name = name; _symbol = symbol; _quantity = quantity; _owner = msg.sender; } function transfer(address to) { if (_owner != msg.sender) { throw; } _owner = to; } } — — 2018-04-25 – p.19/41
20. Solidity JavaScript ( , ) (constructor) ( ) ( ) Ether — — 2018-04-25 – p.20/41
21. · ex. · ex. — — 2018-04-25 – p.21/41
22. ADEPT — — 2018-04-25 – p.22/41
23. ADEPT ADEPT : IBM IoT → ⇒ — — 2018-04-25 – p.23/41
24. — — 2018-04-25 – p.24/41
25. ⇒ — — 2018-04-25 – p.25/41
26. The DAO ( ) The DAO Split ( ) 360 ETH (50∼60 ) (2016/6/17) ( ) ( ; ) (2016/7/20 ) — — 2018-04-25 – p.26/41
27. — — 2018-04-25 – p.27/41
28. ERC20 ERC (Ethereum Request for Comment) 20 https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md contract ERC20 { function totalSupply() constant returns (uint totalSupply); function balanceOf(address _owner) constant returns (uint balance); function transfer(address _to, uint _value) returns (bool success); function transferFrom(address _from, address _to, uint _value) returns (bool success); function approve(address _spender, uint _value) returns (bool success); function allowance(address _owner, address _spender) constant returns (uint remaining); event Transfer(address indexed _from, address indexed _to, uint _value); event Approval(address indexed _owner, address indexed _spender, uint _value); } name/ , symbol/ , decimals/ approve allowance ERC223 ( ), ERC721 (Non-Fungible) — — 2018-04-25 – p.28/41
29. OS — — 2018-04-25 – p.29/41
30. OS (2007) — — 2018-04-25 – p.30/41
31. OS ↑ cf. NPO/NGO — — 2018-04-25 – p.31/41
32. OS — — 2018-04-25 – p.32/41
33. Uber — — 2018-04-25 – p.33/41
34. Uber Uber P2P + Uber — — 2018-04-25 – p.34/41
35. / . . . — — 2018-04-25 – p.35/41
36. ( ) / / — — 2018-04-25 – p.36/41
37. — 1. ( ) 2. ( ) 3. ( ) — — 2018-04-25 – p.37/41
38. Communicating Promises in the Air CPA : Communicating Promises in the Air etc. → — — 2018-04-25 – p.38/41
39. 10 12 → 120 120 12 12 120 — — 2018-04-25 – p.39/41
40. — — 2018-04-25 – p.40/41
41. — — 2018-04-25 – p.41/41