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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

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

2020年10月19日、慶應義塾大学大学院メディアデザイン研究科の「サービスデザインプロジェクトB (2020 秋)」第2回にて使用したスライドです。

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Kenji Saito
PRO

October 19, 2020
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  1. B 2020 2 ( ) B 2020 — 2 —

    2020-10-19 – p.1/56
  2. https://speakerdeck.com/ks91 Discord Discord ( / / ) Zoom URL (

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

    2020 — 2 — 2020-10-19 – p.4/56
  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) ( )

    B 2020 — 2 — 2020-10-19 – p.7/56
  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߸O  ϒϩοΫ൪߸O

     ϒϩοΫ൪߸O  ϒϩοΫ൪߸O  ϒϩοΫ൪߸O  ϒϩοΫ൪߸O  ͍ͪ͹Μه࿥ɾॻ͖׵͑ͷίετ͕ߴ͍ྺ࢙ ࠷΋վ͟Μ͠ʹ͍͘ྺ࢙ ͕༗ޮ ͻͱͭखલͷϒϩοΫͷ ʮμΠδΣετʯ σδλϧॺ໊͞Εͨ ʮτϥϯβΫγϣϯ औҾ ʯ ϒϩοΫΛ࡞ΔͨΊʹ͸ɺͦͷʮμΠδΣετʯ͕͋Δ਺ҎԼͱ͍͏৚݅Λຬͨͨ͠Γ 1SPPGPG8PSL Ծ૝௨՟ͷ࣋ͪ෼ʹԠͨ͡ݖརΛ࢖ͬͨ౤ථͰউͬͨΓ 1SPPGPG4UBLF ͢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

    B 2020 — 2 — 2020-10-19 – p.15/56
  16. : 2009 ↑ 11 B 2020 — 2 — 2020-10-19

    – p.16/56
  17. ( ) ADR (Active (space) Debris Removal) : https://doi.org/10.1109/TCSS.2018.2890655 (1930

    ) ( ) B 2020 — 2 — 2020-10-19 – p.17/56
  18. ( ) ( ) ( ) B 2020 — 2

    — 2020-10-19 – p.18/56
  19. ( ) ( - ) : https://doi.org/10.1016/j.future.2019.05.019 B 2020 —

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

    — 2020-10-19 – p.20/56
  21. ( ) B 2020 — 2 — 2020-10-19 – p.21/56

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

    2020 — 2 — 2020-10-19 – p.22/56
  23. ( ) ( ) ( ) B 2020 — 2

    — 2020-10-19 – p.23/56
  24. ( ) B 2020 — 2 — 2020-10-19 – p.24/56

  25. ( ) ( ) B 2020 — 2 — 2020-10-19

    – p.25/56
  26. B 2020 — 2 — 2020-10-19 – p.26/56

  27. with ( ) ( ) ( ) B 2020 —

    2 — 2020-10-19 – p.27/56
  28. DNS IP AS B 2020 — 2 — 2020-10-19 –

    p.28/56
  29. ( ) ( ) (web ) B 2020 — 2

    — 2020-10-19 – p.29/56
  30. ( ) ( ) ( ) ( ) ( )

    ( ) B 2020 — 2 — 2020-10-19 – p.30/56
  31. ( ) ( ) 3D B 2020 — 2 —

    2020-10-19 – p.31/56
  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

    – p.41/56
  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
  47. B 2020 — 2 — 2020-10-19 – p.47/56

  48. . . . B 2020 — 2 — 2020-10-19 –

    p.48/56
  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

    — 2020-10-19 – p.52/56
  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