イーサリアム (Ethereum) 入門 / Introduction to Ethereum

2018年7月11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「イーサリアム入門」(【ハンズオン】スマートコントラクトプログラミング (1)) にて使用したスライドです。

Transcript

1. (Ethereum)
   (1)
   CSO / SFC
   ( https://speakerdeck.com/ks91 )
   ks91@blockchainhub.co.jp
   (Ethereum) — (1) — 2018-07-11 – p.1/39
   

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2. ( )
   CSO (Chief Science Officer)
   SFC ( )
   1993 ( )
   2006 ( )
   SFC 17
   P2P (Peer-to-Peer)
   2011
   → ( )
   (Ethereum) — (1) — 2018-07-11 – p.2/39
   

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3. (2017)
   : SF + +
   SF (2048 )
   2048
   (Ethereum) — (1) — 2018-07-11 – p.3/39
   

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4. 1.
   2.
   3.
   4.
   5.
   (Ethereum) — (1) — 2018-07-11 – p.4/39
   

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5. 1.
   (Ethereum) — (1) — 2018-07-11 – p.5/39
   

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6. ( )
   (1)
   (2)
   (3)
   (4) ( )
   state machine replication
   (Ethereum) — (1) — 2018-07-11 – p.6/39
   

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7. 1)
   2)
   3)
   ⇒
   ⇒
   ·
   / (dependable )
   (Ethereum) — (1) — 2018-07-11 – p.7/39
   

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8. /DLT
   ( )
   Bitcoin ( )
   Open Assets Protocol (OAP)
   ( )
   Ethereum ( ) ( )
   Enterprise Ethereum Alliance (↓ )
   (DLT) ( )
   Hyperledger (Linux Foundation)
   Fabric (IBM/DAH), Sawtooth (Intel), Iroha ( )
   Corda (R3), Tangle (IOTA),
   . . .
   , BBc-1 ( )
   (Ethereum) — (1) — 2018-07-11 – p.8/39
   

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9. /DLT
   ( )
   ( )
   ( vs. )
   ( )
   ( )
   ( )
   ⇒
   ( : BBc-1)
   DLT
   :
   :
   (Ethereum) — (1) — 2018-07-11 – p.9/39
   

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10. Vitalik Buterin, “Ethereum White Paper: A NEXT GENERATION SMART
    CONTRACT & DECENTRALIZED APPLICATION PLATFORM”
    15
    (Ethereum) — (1) — 2018-07-11 – p.10/39
    

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11. 2.
    macOS (High Sierra 10.13) + Homebrew
    Linux (Ubuntu 16.04)
    Windows 10 + Windows Subsystem for Linux
    geth, solidity populus
    (Ethereum) — (1) — 2018-07-11 – p.11/39
    

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12. geth
    GO
    https://github.com/ethereum/go-ethereum/wiki/Building-Ethereum #installation-instructions
    geth 1.8.12-stable (7/10 )
    $ geth -help
    (Ethereum) — (1) — 2018-07-11 – p.12/39
    

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13. Solidity
    http://solidity.readthedocs.io/en/latest/installing-solidity.html
    solc 0.4.24 (7/10 )
    $ solc --version
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14. Python3
    macOS
    $ brew install python3
    Linux
    $ sudo add-apt-repository ppa:deadsnakes/ppa
    $ sudo apt update
    $ sudo apt install python3.6 python3.6-dev python3.6-venv
    16.10 python3 apt
    (Ethereum) — (1) — 2018-07-11 – p.14/39
    

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15. Python (venv)
    macOS ‘python3.6’ ‘python3’
    $ python3.6 -m venv popenv
    $ source popenv/bin/activate
    (popenv) $ pip install -U pip
    (popenv) $ deactivate
    (Ethereum) — (1) — 2018-07-11 – p.15/39
    

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16. Populus
    Python
    http://populus.readthedocs.io/en/latest/quickstart.html
    Open SSL
    Populus
    $ pip install populus==2.1.0
    $ pip install -U web3==3.16.5
    $ pip install -U eth-utils==0.7.4
    version 2.1.0
    (Ethereum) — (1) — 2018-07-11 – p.16/39
    

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17. $ populus init
    contracts/Greeter.sol tests/test_greeter.py
    $ populus compile
    $ py.test .
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18. (1)
    http://beyond-blockchain.org/public/BcH-smart-contract-programming.zip
    Python (init.py, run.py, deploy.py)
    project.json genesis.json
    $ python init.py
    $ touch MyToken.sol
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19. (2)
    $ geth init genesis.json
    $ geth account new
    16
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20. “run.py”
    ‘--etherbase’ 0x
    ( run.py):
    http://beyond-blockchain.org/public/modified_run_py.zip
    $ python run.py
    $ tail -f geth.log
    process id kill
    (Ethereum) — (1) — 2018-07-11 – p.20/39
    

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21. DAG (Directed Acyclic Graph)
    Ether
    (Ethereum) — (1) — 2018-07-11 – p.21/39
    

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22. 3.
    (Ethereum) — (1) — 2018-07-11 – p.22/39
    

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23. (Ethereum) — (1) — 2018-07-11 – p.23/39
    

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24. . . .
    (Ethereum) — (1) — 2018-07-11 – p.24/39
    

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25. vs.
    (Ethereum) — (1) — 2018-07-11 – p.25/39
    

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26. = run
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27. Ether
    Ethereum
    EOA : Externally-Owned Account
    Ether EVM
    EVM
    (Ethereum) — (1) — 2018-07-11 – p.27/39
    

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28. EVM : Ethereum Virtual Machine
    Gas
    (Ethereum) — (1) — 2018-07-11 – p.28/39
    

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29. EVM
    :
    :
    Solidity — JavaScript
    LLL — Lisp
    (Ethereum) — (1) — 2018-07-11 – p.29/39
    

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30. Solidity ( )
    pragma solidity ˆ0.4.24;
    contract IndivisibleAsset { /* */
    string public _name;
    string public _symbol;
    uint256 public _quantity;
    address public _owner;
    constructor (string name, string symbol, uint256 quantity) public {
    _name = name;
    _symbol = symbol;
    _quantity = quantity;
    _owner = msg.sender;
    }
    function transfer(address to) external returns (bool) {
    require(_owner == msg.sender);
    _owner = to;
    return true;
    }
    }
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31. (Ethereum) — (1) — 2018-07-11 – p.31/39
    

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32. 4.
    (Ethereum) — (1) — 2018-07-11 – p.32/39
    

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33. ADEPT
    ADEPT : IBM IoT
    (Ethereum) — (1) — 2018-07-11 – p.33/39
    

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34. (Ethereum) — (1) — 2018-07-11 – p.34/39
    

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35. ⇒
    (Ethereum) — (1) — 2018-07-11 – p.35/39
    

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36. The DAO ( )
    The DAO
    Split ( ) 360 ETH (50∼60 ) (2016/6/17)
    ( )
    ( ; )
    (2016/7/20 )
    (Ethereum) — (1) — 2018-07-11 – p.36/39
    

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37. 5.
    (Ethereum) — (1) — 2018-07-11 – p.37/39
    

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38. Greeter.sol
    “deploy.py”
    __main__ Greeter
    0x
    &
    $ python deploy.py
    (Ethereum) — (1) — 2018-07-11 – p.38/39
    

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39. I
    : ERC20
    ∼ ∼
    (Ethereum) — (1) — 2018-07-11 – p.39/39
    

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