サービスデザインプロジェクトB 第2回「ブロックチェーン概論とインストール大会」 / Overview of Blockchain and Installation

Transcript

1. B 2020 2 ( ) B 2020 — 2 —

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2. https://speakerdeck.com/ks91 Discord Discord ( / / ) Zoom URL (

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3. ( ) 1 10 12 • 2 10 19 •

   3 10 26 4 11 2 5 11 9 1 6 11 16 2 7 11 30 8 12 7 B 2020 — 2 — 2020-10-19 – p.3/56

4. – : : Ethereum ( ) ( ) Ethereum B

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5. – B 2020 — 2 — 2020-10-19 – p.5/56

6. ( ) ( ) ( ) (BP : Blockchain Property

   ) BP-1 : BP-2 : BP-3 : ( ) ( ) B 2020 — 2 — 2020-10-19 – p.6/56

7. ( ) (LIFO : Last In, First Out) ( )

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8. ( ) ( ) ( ) ( ) ( 16

   ) SHA (Secure Hash Algorithm) ( ) 1bit B 2020 — 2 — 2020-10-19 – p.8/56

9. ( ) ( ) < , > ( ) ←

   : < , > : : < , , > : OK ( 1 ) NG ( ) B 2020 — 2 — 2020-10-19 – p.9/56

10. BP-1 ( ), BP-2 ( ) BBc-1 f : →

    BP-3 ( ) ( ) ( ) ← BP-2 ← BP-3 ( ) ← BP-3 + ← BP-{1,2} B 2020 — 2 — 2020-10-19 – p.10/56

11. [Lamport 1984][Schneider 1990] (1) (2) (3) (4) ( ) ←

    ↑ B 2020 — 2 — 2020-10-19 – p.11/56

12. TX : transaction ( 4 TX ) SMRP (State Machine

    Replication Problem) SMRP-1 ( ) SMRP-2 : B 2020 — 2 — 2020-10-19 – p.12/56

13. ( ) ( ) ϒϩοΫ൪߸
    
    O ϒϩοΫ൪߸
    
    O  ϒϩοΫ൪߸
    
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    O

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    O  ϒϩοΫ൪߸
    
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    O  ͍ͪ͹Μه࿥ɾॻ͖׵͑ͷίετ͕ߴ͍ྺ࢙ ࠷΋վ͟Μ͠ʹ͍͘ྺ࢙ ͕༗ޮ ͻͱͭखલͷϒϩοΫͷ ʮμΠδΣετʯ σδλϧॺ໊͞Εͨ ʮτϥϯβΫγϣϯ औҾ ʯ ϒϩοΫΛ࡞ΔͨΊʹ͸ɺͦͷʮμΠδΣετʯ͕͋Δ਺ҎԼͱ͍͏৚݅Λຬͨͨ͠Γ 1SPPG
    PG
    8PSL Ծ૝௨՟ͷ࣋ͪ෼ʹԠͨ͡ݖརΛ࢖ͬͨ౤ථͰউͬͨΓ 1SPPG
    PG
    4UBLF ͢Δඞཁ͕͋Δ ίετ͕͔͔Δ ϒϩοΫΛ࡞Δਓ͸ͦͷதʹࣗ෼ʹѼͯͨ Ծ૝௨՟ͰͷใुΛॻ͖ࠐΉ͜ͱ͕Ͱ͖ɺ ͦͷϒϩοΫ͕༗ޮͳྺ࢙ͷதʹ͋Δ৔߹ʹ ݶΓใु΋༗ޮͱͳΔ τϥϯβΫγϣϯͷଘࡏΛ֬ೝ͢Δ ͨΊͷޮ཰తͳํ๏͕ఏڙ͞ΕΔ ਖ਼౰ੑ ଘࡏੑ །Ұੑ Proof of Work ( ) . . . → B 2020 — 2 — 2020-10-19 – p.13/56

14. (BP-3 ) ( : ) (BP-3 ) ( : )

    BP-{1,2,3} BP-{1, 2} ⇒ B 2020 — 2 — 2020-10-19 – p.14/56

15. (Confidentiality) BP-{1,2,3} ↑ ( = ) (Integrity) BP-3 (Availability) BP-2

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16. : 2009 ↑ 11 B 2020 — 2 — 2020-10-19

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17. ( ) ADR (Active (space) Debris Removal) : https://doi.org/10.1109/TCSS.2018.2890655 (1930

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18. ( ) ( ) ( ) B 2020 — 2

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19. ( ) ( - ) : https://doi.org/10.1016/j.future.2019.05.019 B 2020 —

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20. ( ) ( ) ( ) B 2020 — 2

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21. ( ) B 2020 — 2 — 2020-10-19 – p.21/56

22. / ( ) ( ) ( ) ( ) B

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23. ( ) ( ) ( ) B 2020 — 2

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25. ( ) ( ) B 2020 — 2 — 2020-10-19

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26. B 2020 — 2 — 2020-10-19 – p.26/56

27. with ( ) ( ) ( ) B 2020 —

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28. DNS IP AS B 2020 — 2 — 2020-10-19 –

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29. ( ) ( ) (web ) B 2020 — 2

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30. ( ) ( ) ( ) ( ) ( )

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31. ( ) ( ) 3D B 2020 — 2 —

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32. : Ethereum macOS (Catalina 10.15.7) + Homebrew Homebrew Linux (Ubuntu

    18.04) Windows 10 + Windows Subsystem for Linux (Ubuntu 18.04 ) WSL Ethereum solidity brownie B 2020 — 2 — 2020-10-19 – p.32/56

33. Solidity Ethereum http://solidity.readthedocs.io/en/latest/installing-solidity.html Linux (on Windows) “sudo apt”, macOS “brew”

    solc 0.7.3 (10/10 ) $ solc --version brownie py-solc-x solc (dependencies) ( solc py-solc-x ) B 2020 — 2 — 2020-10-19 – p.33/56

34. Python3 macOS $ brew install python3 Linux $ sudo add-apt-repository

    ppa:deadsnakes/ppa $ sudo apt update $ sudo apt install python3.8 python3.8-dev python3.8-venv python3.8-tk 16.10 python3(.8) apt B 2020 — 2 — 2020-10-19 – p.34/56

35. macOS : . . . macOS wget brew dyld: Library

    not loaded: /usr/local/opt/gettext/lib/libintl.8.dylib $ brew uninstall --force gettext $ brew install gettext B 2020 — 2 — 2020-10-19 – p.35/56

36. Python (venv) macOS ‘python3.8’ ‘python3’ $ python3.8 -m venv bbc1env

    $ source bbc1env/bin/activate (bbc1env) $ pip install -U pip (bbc1env) $ pip install wheel bbc1env ( BBc-1 ) ( ) (bbc1env) $ deactivate B 2020 — 2 — 2020-10-19 – p.36/56

37. Ganache CLI Ethereum RPC CLI : Command Line Interface npm

    ( ) macOS https://qiita.com/kyosuke5_20/items/c5f68fc9d89b84c0df09 Linux https://qiita.com/seibe/items/36cef7df85fe2cefa3ea npm Ganache CLI $ sudo npm install -g ganache-cli B 2020 — 2 — 2020-10-19 – p.37/56

38. Brownie Python Ethereum https://eth-brownie.readthedocs.io Brownie $ pip install eth-brownie version

    1.11.8 (10/10 ) B 2020 — 2 — 2020-10-19 – p.38/56

39. $ brownie init ( ERC-20 ) $ brownie bake token

    $ cd token ( ) $ brownie compile ( ) $ pytest tests B 2020 — 2 — 2020-10-19 – p.39/56

40. Brownie $ brownie console Python >>> len(accounts) 10 >>> accounts[0].balance()

    100000000000000000000 >>> quit() B 2020 — 2 — 2020-10-19 – p.40/56

41. ( ) Ethereum ropsten B 2020 — 2 — 2020-10-19

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42. infura.io Brownie https://infura.io SIGN UP PROJECT ID infura Ethereum API

    infura . . . infura.io PROJECT ID WEB3_INFURA_PROJECT_ID PROJECT ID (∼/.bash_profile ) $ export WEB3_INFURA_PROJECT_ID= PROJECT ID B 2020 — 2 — 2020-10-19 – p.42/56

43. ropsten ETH brownie console ropsten >>> network.disconnect() >>> network.connect(’ropsten’) >>>

    len(accounts) 0 >>> accounts.add() <LocalAccount object ’ 16 ’> >>> accounts[0].private_key 16 >>> quit() Ropsten Testnet ETH Faucet 5.0ETH https://faucet.dimensions.network/ ( ) https://metamask.io/ B 2020 — 2 — 2020-10-19 – p.43/56

44. ropsten ETH brownie console ropsten ETH >>> network.disconnect() >>> network.connect(’ropsten’)

    >>> len(accounts) 0 >>> accounts.add( 16 ) <LocalAccount object ’ 16 ’> >>> accounts[0].balace() ETH >>> quit() ETH >>> accounts[0].transfer(accounts[1], "1 ether") B 2020 — 2 — 2020-10-19 – p.44/56

45. Ethereum B 2020 — 2 — 2020-10-19 – p.45/56

46. Ethereum Vitalik Buterin, “Ethereum White Paper: A NEXT GENERATION SMART

    CONTRACT & DECENTRALIZED APPLICATION PLATFORM” 15 (= ) = ⇒ → Dapps ( / / ) B 2020 — 2 — 2020-10-19 – p.46/56

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48. . . . B 2020 — 2 — 2020-10-19 –

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49. vs. B 2020 — 2 — 2020-10-19 – p.49/56

50. = run B 2020 — 2 — 2020-10-19 – p.50/56

51. Ether Ethereum EOA : Externally-Owned Account ( ) Ether EVM

    EVM B 2020 — 2 — 2020-10-19 – p.51/56

52. EVM : Ethereum Virtual Machine Gas B 2020 — 2

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53. EVM : : Solidity — JavaScript LLL — Lisp Vyper

    — Python B 2020 — 2 — 2020-10-19 – p.53/56

54. Solidity ( ) pragma solidityˆ0.5.0; contract IndivisibleAsset { /* */

    string public _name; string public _symbol; uint256 public _quantity; address public _owner; constructor(string memory name, string memory symbol, uint256 quantity) public { _name = name; _symbol = symbol; _quantity = quantity; _owner = msg.sender; } function transfer(address to) public returns (bool) { require (_owner == msg.sender); _owner = to; return true; } } B 2020 — 2 — 2020-10-19 – p.54/56

55. Ethereum B 2020 — 2 — 2020-10-19 – p.55/56

56. B 2020 — 2 — 2020-10-19 – p.56/56