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BBc-1 と Ethereum 入門 / Introduction to BBc-1 and Ethereum

BBc-1 と Ethereum 入門 / Introduction to BBc-1 and Ethereum

2020年5月13日(水)、ブロックチェーンハブ主催のブロックチェーンアカデミー「実践!スマートコントラクトプログラミング 」第1回にて使用したスライドです。

Kenji Saito

May 13, 2020
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  1. ( ) SFC / ( ) CSO (Chief Science Officer)

    1993 ( ) 2006 ( ) SFC 19 P2P (Peer-to-Peer) ( 9 ) 2011 2018 2019 2019 2020 “STAY HOME, ENJOY LIFE” (in Zoom) → ( ) — 1 BBc-1 Ethereum — 2020-05-13 – p.3/34
  2. 1. Ethereum 2. Ethereum 3. Ethereum 4. 5. BBc-1 —

    1 BBc-1 Ethereum — 2020-05-13 – p.5/34
  3. 1) 2) (= ) 3) ⇒ (= ) ⇒ ·

    / (dependable ) — 1 BBc-1 Ethereum — 2020-05-13 – p.7/34
  4. /DLT ( ) Bitcoin ( ) Open Assets Protocol (OAP)

    ( ) Ethereum (Dapps ( ) ) ( ) EOS (↓ ) (DLT) ( ) Hyperledger (Linux Foundation) Fabric (IBM/DAH), Sawtooth (Intel), Iroha ( ) Corda (R3), . . . , BBc-1 ( ) — 1 BBc-1 Ethereum — 2020-05-13 – p.8/34
  5. Ethereum Vitalik Buterin, “Ethereum White Paper: A NEXT GENERATION SMART

    CONTRACT & DECENTRALIZED APPLICATION PLATFORM” 15 Dapps ( / / ) — 1 BBc-1 Ethereum — 2020-05-13 – p.9/34
  6. 2. Ethereum macOS (Catalina 10.15.4) + Homebrew Linux (Ubuntu 18.04)

    Windows 10 + Windows Subsystem for Linux (Ubuntu 18.04 ) Ethereum solidity brownie — 1 BBc-1 Ethereum — 2020-05-13 – p.10/34
  7. Solidity Ethereum http://solidity.readthedocs.io/en/latest/installing-solidity.html Linux (on Windows) “sudo apt”, macOS “brew”

    solc 0.6.7 (5/13 ) $ solc --version brownie py-solc-x solc (dependencies) ( solc py-solc-x ) — 1 BBc-1 Ethereum — 2020-05-13 – p.11/34
  8. Python3 macOS $ brew install python3 Linux $ sudo add-apt-repository

    ppa:deadsnakes/ppa $ sudo apt update $ sudo apt install python3.7 python3.7-dev python3.7-venv python3.7-tk 16.10 python3(.7) apt python3.8 — 1 BBc-1 Ethereum — 2020-05-13 – p.12/34
  9. macOS : . . . macOS wget brew dyld: Library

    not loaded: /usr/local/opt/gettext/lib/libintl.8.dylib $ brew uninstall --force gettext $ brew install gettext — 1 BBc-1 Ethereum — 2020-05-13 – p.13/34
  10. Python (venv) macOS ‘python3.7’ ‘python3’ $ python3.7 -m venv bbc1env

    $ source bbc1env/bin/activate (bbc1env) $ pip install -U pip (bbc1env) $ pip install wheel bbc1env ( BBc-1 ) ( ) (bbc1env) $ deactivate — 1 BBc-1 Ethereum — 2020-05-13 – p.14/34
  11. Ganache CLI Ethereum RPC 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 — 1 BBc-1 Ethereum — 2020-05-13 – p.15/34
  12. $ brownie init ( ERC-20 ) $ brownie bake token

    $ cd token ( ) $ brownie compile ( ) $ pytest tests — 1 BBc-1 Ethereum — 2020-05-13 – p.17/34
  13. Brownie $ brownie console Python >>> len(accounts) 10 >>> accounts[0].balance()

    100000000000000000000 >>> quit() — 1 BBc-1 Ethereum — 2020-05-13 – p.18/34
  14. Ether Ethereum EOA : Externally-Owned Account Ether EVM EVM —

    1 BBc-1 Ethereum — 2020-05-13 – p.24/34
  15. EVM : : Solidity — JavaScript LLL — Lisp Vyper

    — Python — 1 BBc-1 Ethereum — 2020-05-13 – p.26/34
  16. 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; } } — 1 BBc-1 Ethereum — 2020-05-13 – p.27/34
  17. infura.io Brownie https://infura.io SIGN UP PROJECT ID infura Ethereum API

    infura . . . infura.io PROJECT ID Brownie “brownie-config.yaml” . . . YAML WEB3_INFURA_PROJECT_ID PROJECT ID (∼/.bash_profile ) $ export WEB3_INFURA_PROJECT_ID= PROJECT ID — 1 BBc-1 Ethereum — 2020-05-13 – p.30/34
  18. 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 Ethereum Faucet 1.0ETH https://faucet.ropsten.be ( ) https://metamask.io/ — 1 BBc-1 Ethereum — 2020-05-13 – p.31/34
  19. 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() — 1 BBc-1 Ethereum — 2020-05-13 – p.32/34