Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
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」 / Over...
Search
Kenji Saito
PRO
October 19, 2020
Technology
1
160
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。
Kenji Saito
PRO
October 19, 2020
Tweet
Share
More Decks by Kenji Saito
See All by Kenji Saito
マニフェスト: 人類の知のフロンティアに向けた拡張的足場へ / Manifesto: Toward Expansive Scaffolding for Humanity's Knowledge Frontier
ks91
PRO
0
8
続・スマートコントラクトと分散ファイナンス / Smart Contracts and Decentralized Finance, Continued
ks91
PRO
0
43
スマートコントラクトと分散ファイナンス / Smart Contracts and Decentralized Finance
ks91
PRO
0
63
シン・ブロックチェーン / Truth of Blockchain
ks91
PRO
0
97
パスワード/パスフレーズと認証 / Password, Passphrase and Authentication
ks91
PRO
0
37
git と GitHub / git and GitHub
ks91
PRO
0
36
ソフトウェアの開発と保守 / Software Development and Maintenance
ks91
PRO
0
50
インターネットの特徴 / Features of the Internet
ks91
PRO
0
34
インターネットのガバナンス / Governance of the Internet
ks91
PRO
0
30
Other Decks in Technology
See All in Technology
What’s new in Android development tools
yanzm
0
330
面倒な作業はAIにおまかせ。Flutter開発をスマートに効率化
ruideengineer
0
270
品質と速度の両立:生成AI時代の品質保証アプローチ
odasho
1
390
PO初心者が考えた ”POらしさ”
nb_rady
0
220
2025-07-06 QGIS初級ハンズオン「はじめてのQGIS」
kou_kita
0
170
MUITにおける開発プロセスモダナイズの取り組みと開発生産性可視化の取り組みについて / Modernize the Development Process and Visualize Development Productivity at MUIT
muit
2
17k
【Oracle Cloud ウェビナー】インフラのプロフェッショナル集団KELが考えるOCIでのソリューション実現
oracle4engineer
PRO
1
100
60以上のプロダクトを持つ組織における開発者体験向上への取り組み - チームAPIとBackstageで構築する組織の可視化基盤 - / sre next 2025 Efforts to Improve Developer Experience in an Organization with Over 60 Products
vtryo
2
360
タイミーのデータモデリング事例と今後のチャレンジ
ttccddtoki
6
2.4k
Operating Operator
shhnjk
1
600
AI専用のリンターを作る #yumemi_patch
bengo4com
6
4.3k
Sansanのデータプロダクトマネジメントのアプローチ
sansantech
PRO
0
170
Featured
See All Featured
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
Why You Should Never Use an ORM
jnunemaker
PRO
58
9.4k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
3.9k
The Art of Delivering Value - GDevCon NA Keynote
reverentgeek
15
1.5k
The Art of Programming - Codeland 2020
erikaheidi
54
13k
Java REST API Framework Comparison - PWX 2021
mraible
31
8.7k
Faster Mobile Websites
deanohume
307
31k
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
53
2.9k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
161
15k
Facilitating Awesome Meetings
lara
54
6.4k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
667
120k
The Language of Interfaces
destraynor
158
25k
Transcript
B 2020 2 ( ) B 2020 — 2 —
2020-10-19 – p.1/56
https://speakerdeck.com/ks91 Discord Discord ( / / ) Zoom URL (
) B 2020 — 2 — 2020-10-19 – p.2/56
( ) 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
– : : Ethereum ( ) ( ) Ethereum B
2020 — 2 — 2020-10-19 – p.4/56
– B 2020 — 2 — 2020-10-19 – p.5/56
( ) ( ) ( ) (BP : Blockchain Property
) BP-1 : BP-2 : BP-3 : ( ) ( ) B 2020 — 2 — 2020-10-19 – p.6/56
( ) (LIFO : Last In, First Out) ( )
B 2020 — 2 — 2020-10-19 – p.7/56
( ) ( ) ( ) ( ) ( 16
) SHA (Secure Hash Algorithm) ( ) 1bit B 2020 — 2 — 2020-10-19 – p.8/56
( ) ( ) < , > ( ) ←
: < , > : : < , , > : OK ( 1 ) NG ( ) B 2020 — 2 — 2020-10-19 – p.9/56
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
[Lamport 1984][Schneider 1990] (1) (2) (3) (4) ( ) ←
↑ B 2020 — 2 — 2020-10-19 – p.11/56
TX : transaction ( 4 TX ) SMRP (State Machine
Replication Problem) SMRP-1 ( ) SMRP-2 : B 2020 — 2 — 2020-10-19 – p.12/56
( ) ( ) ϒϩοΫ൪߸O ϒϩοΫ൪߸O ϒϩοΫ൪߸O ϒϩοΫ൪߸O
ϒϩοΫ൪߸O ϒϩοΫ൪߸O ϒϩοΫ൪߸O ϒϩοΫ൪߸O ͍ͪΜهɾॻ͖͑ͷίετ͕ߴ͍ྺ࢙ ࠷վ͟Μ͠ʹ͍͘ྺ࢙ ͕༗ޮ ͻͱͭखલͷϒϩοΫͷ ʮμΠδΣετʯ σδλϧॺ໊͞Εͨ ʮτϥϯβΫγϣϯ औҾ ʯ ϒϩοΫΛ࡞ΔͨΊʹɺͦͷʮμΠδΣετʯ͕͋ΔҎԼͱ͍͏݅Λຬͨͨ͠Γ 1SPPGPG8PSL Ծ௨՟ͷ࣋ͪʹԠͨ͡ݖརΛͬͨථͰউͬͨΓ 1SPPGPG4UBLF ͢Δඞཁ͕͋Δ ίετ͕͔͔Δ ϒϩοΫΛ࡞ΔਓͦͷதʹࣗʹѼͯͨ Ծ௨՟ͰͷใुΛॻ͖ࠐΉ͜ͱ͕Ͱ͖ɺ ͦͷϒϩοΫ͕༗ޮͳྺ࢙ͷதʹ͋Δ߹ʹ ݶΓใु༗ޮͱͳΔ τϥϯβΫγϣϯͷଘࡏΛ֬ೝ͢Δ ͨΊͷޮతͳํ๏͕ఏڙ͞ΕΔ ਖ਼ੑ ଘࡏੑ །Ұੑ Proof of Work ( ) . . . → B 2020 — 2 — 2020-10-19 – p.13/56
(BP-3 ) ( : ) (BP-3 ) ( : )
BP-{1,2,3} BP-{1, 2} ⇒ B 2020 — 2 — 2020-10-19 – p.14/56
(Confidentiality) BP-{1,2,3} ↑ ( = ) (Integrity) BP-3 (Availability) BP-2
B 2020 — 2 — 2020-10-19 – p.15/56
: 2009 ↑ 11 B 2020 — 2 — 2020-10-19
– p.16/56
( ) ADR (Active (space) Debris Removal) : https://doi.org/10.1109/TCSS.2018.2890655 (1930
) ( ) B 2020 — 2 — 2020-10-19 – p.17/56
( ) ( ) ( ) B 2020 — 2
— 2020-10-19 – p.18/56
( ) ( - ) : https://doi.org/10.1016/j.future.2019.05.019 B 2020 —
2 — 2020-10-19 – p.19/56
( ) ( ) ( ) B 2020 — 2
— 2020-10-19 – p.20/56
( ) B 2020 — 2 — 2020-10-19 – p.21/56
/ ( ) ( ) ( ) ( ) B
2020 — 2 — 2020-10-19 – p.22/56
( ) ( ) ( ) B 2020 — 2
— 2020-10-19 – p.23/56
( ) B 2020 — 2 — 2020-10-19 – p.24/56
( ) ( ) B 2020 — 2 — 2020-10-19
– p.25/56
B 2020 — 2 — 2020-10-19 – p.26/56
with ( ) ( ) ( ) B 2020 —
2 — 2020-10-19 – p.27/56
DNS IP AS B 2020 — 2 — 2020-10-19 –
p.28/56
( ) ( ) (web ) B 2020 — 2
— 2020-10-19 – p.29/56
( ) ( ) ( ) ( ) ( )
( ) B 2020 — 2 — 2020-10-19 – p.30/56
( ) ( ) 3D B 2020 — 2 —
2020-10-19 – p.31/56
: 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
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
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
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
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
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
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
$ brownie init ( ERC-20 ) $ brownie bake token
$ cd token ( ) $ brownie compile ( ) $ pytest tests B 2020 — 2 — 2020-10-19 – p.39/56
Brownie $ brownie console Python >>> len(accounts) 10 >>> accounts[0].balance()
100000000000000000000 >>> quit() B 2020 — 2 — 2020-10-19 – p.40/56
( ) Ethereum ropsten B 2020 — 2 — 2020-10-19
– p.41/56
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
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
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
Ethereum B 2020 — 2 — 2020-10-19 – p.45/56
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
B 2020 — 2 — 2020-10-19 – p.47/56
. . . B 2020 — 2 — 2020-10-19 –
p.48/56
vs. B 2020 — 2 — 2020-10-19 – p.49/56
= run B 2020 — 2 — 2020-10-19 – p.50/56
Ether Ethereum EOA : Externally-Owned Account ( ) Ether EVM
EVM B 2020 — 2 — 2020-10-19 – p.51/56
EVM : Ethereum Virtual Machine Gas B 2020 — 2
— 2020-10-19 – p.52/56
EVM : : Solidity — JavaScript LLL — Lisp Vyper
— Python B 2020 — 2 — 2020-10-19 – p.53/56
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
Ethereum B 2020 — 2 — 2020-10-19 – p.55/56
B 2020 — 2 — 2020-10-19 – p.56/56