Ethereum 演習III / Ethereum Exercise III

2023年4月26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。

1. 4 Ethereum III CSO / ks91@blockchainhub.co.jp — 4 Ethereum III — 2023-04-26 – p.1/26
2. https://speakerdeck.com/ks91 — 4 Ethereum III — 2023-04-26 – p.2/26
3. ( ) 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 2022.3 2023 AI VR 2023.2-3 “POWER TO THE PEOPLE” → ( ) — 4 Ethereum III — 2023-04-26 – p.3/26
4. web3 4 web3 NFT (Non-Fungible Token) DAO (Decentralized Autonomous Organization) — 4 Ethereum III — 2023-04-26 – p.4/26
5. 1. NFT DAO 2. : NFT 3. : DAO 4. — 4 Ethereum III — 2023-04-26 – p.5/26
6. NFT DAO DeFi ( ) — 4 Ethereum III — 2023-04-26 – p.6/26
7. ( ) = = : . . . ( : ) ( ) . . . . . . . . . . . . — 4 Ethereum III — 2023-04-26 – p.7/26
8. ⇒ ( ) . . . . . . — 4 Ethereum III — 2023-04-26 – p.8/26
9. DeFi ( ) DeFi : Decentralized Finace . . . ( ) DeFi DAO — 4 Ethereum III — 2023-04-26 – p.9/26
10. NFT ( ) NFT : Non-Fungible Token ( ) (1 ) → fungible token ( ) → NFT — 4 Ethereum III — 2023-04-26 – p.10/26
11. ERC-721 ERC (Ethereum Request for Comments) 721 EIP (Ethereum Improvement Proposal) 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 Ethereum III — 2023-04-26 – p.11/26
12. NFT NFT URL Marlinspike, M.: My first impressions of web3 (2022) Web3 . . . URL ↑ NFT → → NFT NFT ↔ NFT — 4 Ethereum III — 2023-04-26 – p.12/26
13. 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 Ethereum III — 2023-04-26 – p.13/26
14. : NFT — 4 Ethereum III — 2023-04-26 – p.14/26
15. NFT Linux (Ubuntu 22.04) Python3 + eth-brownie 1.19.3 (Python Ethereum ) $ brownie bake nft nft ( ) contracts SimpleCollectible.sol ERC-721 — 4 Ethereum III — 2023-04-26 – p.15/26
16. 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 Ethereum III — 2023-04-26 – p.16/26
17. NFT (2) NFT(?) NFT >>> collectible.ownerOf( NFT ID) # >>> collectible.ownerOf( NFT ID) # NFT Ethereum Ethereum NFT NFT Ethereum Lazy Minting (?) ( ) ( ) NFT — 4 Ethereum III — 2023-04-26 – p.17/26
18. NFT < , ID> ERC-721 OK NFT . . . ID → NFT ID NFT NFT URL . . . URL . . . →NFT — 4 Ethereum III — 2023-04-26 – p.18/26
19. NFT NFT . . . NFT ( ) ↑ ID . . . — 4 Ethereum III — 2023-04-26 – p.19/26
20. 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 Ethereum III — 2023-04-26 – p.20/26
21. NFT : ERC-721 NFT NFT (ID) NFT → URI NFT ( NFT ) (ID) (URI) → NFT ( ) URI → ( ) → ( ) NFT NFT NFT — 4 Ethereum III — 2023-04-26 – p.21/26
22. : DAO — 4 Ethereum III — 2023-04-26 – p.22/26
23. DAO (1) ( ) (2) (3) . . . (a) ( ) (b) ( ) https://medium.com/coinmonks/beanstalk-exploit-a-simplified-post-mortem-analysis-92e6cdb17ace — 4 Ethereum III — 2023-04-26 – p.23/26
24. 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 Ethereum III — 2023-04-26 – p.24/26
25. — 4 Ethereum III — 2023-04-26 – p.25/26
26. — 4 Ethereum III — 2023-04-26 – p.26/26