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BBc-1 と Ethereum 演習 III / BBc-1 and Ethereum Ex...

BBc-1 と Ethereum 演習 III / BBc-1 and Ethereum Exercise III

2022年10月5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にて使用したスライドです。

Kenji Saito

October 05, 2022
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  1. 4 BBc-1 Ethereum III CSO / [email protected] — 4 BBc-1

    Ethereum III — 2022-10-05 – p.1/26
  2. ( ) SFC ( ) CSO (Chief Science Officer) 1993

    ( ) 2006 ( ) SFC 22 P2P (Peer-to-Peer) 2011 ( ) 2018 2019 VR 2021.7 VR 2021.8 “ALL THESE WORLDS ARE YOURS” VR 2021.9 & VR 2021.12 VR 2022.3 VR 2022.8 → ( ) — 4 BBc-1 Ethereum III — 2022-10-05 – p.3/26
  3. 1. NFT DAO 2. : NFT 3. : DAO 4.

    — 4 BBc-1 Ethereum III — 2022-10-05 – p.5/26
  4. NFT DAO DeFi ( ) — 4 BBc-1 Ethereum III

    — 2022-10-05 – p.6/26
  5. ( ) = = : . . . ( :

    ) ( ) . . . . . . . . . . . . — 4 BBc-1 Ethereum III — 2022-10-05 – p.7/26
  6. ⇒ ( ) . . . . . . —

    4 BBc-1 Ethereum III — 2022-10-05 – p.8/26
  7. DeFi ( ) DeFi : Decentralized Finace — 4 BBc-1

    Ethereum III — 2022-10-05 – p.9/26
  8. NFT ( ) NFT : Non-Fungible Token ( ) (1

    ) → fungible token ( ) → NFT — 4 BBc-1 Ethereum III — 2022-10-05 – p.10/26
  9. ERC-721 ERC (Ethereum Request for Comments) 721 (721 ) https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md

    interface ERC721 { function balanceOf(address _owner) external view returns (uint256); function ownerOf(uint256 _tokenId) external view returns (address); function safeTransferFrom(address _from, address _to, uint256 _tokenId, . . .) external payable; : } interface ERC721TokenReceiver { function onERC721Received(.. ., uint256 _tokenId, . . .) external returns(bytes4); } interface ERC721Metadata { function name() external view returns (string _name); function symbol() external view returns (string _symbol); function tokenURI(uint256 _tokenId) external view returns (string); } tokenURI URL ( ) ( ) — 4 BBc-1 Ethereum III — 2022-10-05 – p.11/26
  10. NFT NFT URL Marlinspike, M.: My first impressions of web3

    (2022) Web3 . . . URL ↑ NFT → → NFT NFT ↔ NFT — 4 BBc-1 Ethereum III — 2022-10-05 – p.12/26
  11. DAO ( ) DAO : Decentralized Autonomous Organization Vitalik Buterin

    (Ethereum ) https://blog.ethereum.org/2014/05/06/daos-dacs-das-and-more-an-incomplete-terminology-guide/ (1) (2) ( ) (3) DAO . . . / — 4 BBc-1 Ethereum III — 2022-10-05 – p.13/26
  12. NFT Linux (Ubuntu 22.04) Python3 + eth-brownie 1.19.1 (Python Ethereum

    ) $ brownie bake nft nft ( ) contracts SimpleCollectible.sol ERC-721 — 4 BBc-1 Ethereum III — 2022-10-05 – p.15/26
  13. NFT (1) NFT NFT $ cd nft # nft $

    brownie console # eth-brownie (Python ) # ↓ Python >>> network.disconnect() # ( ) >>> network.connect(’mainnet’) # Ethereum >>> collectible = SimpleCollectible.at(’ ’) # >>> collectible.ownerOf(OpenSea NFT ID) # >>> collectible.tokenURI(OpenSea NFT ID) # URL URL URL ( ) — 4 BBc-1 Ethereum III — 2022-10-05 – p.16/26
  14. NFT (2) NFT(?) NFT >>> collectible.ownerOf( NFT ID) # >>>

    collectible.ownerOf( NFT ID) # NFT Ethereum Ethereum NFT NFT Ethereum Lazy Minting (?) ( ) ( ) NFT — 4 BBc-1 Ethereum III — 2022-10-05 – p.17/26
  15. NFT < , ID> ERC-721 OK NFT . . .

    ID → NFT ID NFT NFT URL . . . URL . . . →NFT — 4 BBc-1 Ethereum III — 2022-10-05 – p.18/26
  16. NFT NFT . . . NFT ( ) ↑ ID

    . . . — 4 BBc-1 Ethereum III — 2022-10-05 – p.19/26
  17. NFT NFT >>> network.disconnect() # >>> network.connect(’goerli’) # Ethereum >>>

    accounts.add( ) # >>> collectible = SimpleCollectible.deploy({’from’: accounts[0]}) # NFT >>> collectible.createCollectible( ) # NFT goerli / ( ) “Gas used” Gas Gwei ERC-721a ID 1 — 4 BBc-1 Ethereum III — 2022-10-05 – p.20/26
  18. NFT : ERC-721 NFT NFT (ID) NFT → URI NFT

    ( NFT ) (ID) (URI) → NFT ( ) URI → ( ) → ( ) NFT NFT NFT — 4 BBc-1 Ethereum III — 2022-10-05 – p.21/26
  19. DAO (1) ( ) (2) (3) . . . (a)

    ( ) (b) ( ) https://medium.com/coinmonks/beanstalk-exploit-a-simplified-post-mortem-analysis-92e6cdb17ace — 4 BBc-1 Ethereum III — 2022-10-05 – p.23/26
  20. MakerDAO https://docs.makerdao.com/smart-contract-modules/governance-module plot ( ) drop ( ) plot eta

    ( ) exec ( ) https://github.com/dapphub/ds-chief/blob/master/src/chief.sol https://github.com/dapphub/ds-auth/blob/master/src/auth.sol https://github.com/dapphub/ds-pause/blob/master/src/pause.sol — 4 BBc-1 Ethereum III — 2022-10-05 – p.24/26