Ethereum 演習 III / Ethereum Exercise III

2023年9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にて使用したスライドです。

Transcript

1. 4 Ethereum III CSO / ks91@blockchainhub.co.jp — 4 Ethereum III — 2023-09-13 – p.1/28
2. https://speakerdeck.com/ks91 — 4 Ethereum III — 2023-09-13 – p.2/28
3. ( ) SFC ( ) CSO (Chief Science Officer) 1993 ( ) 2006 ( ) SFC 22 P2P (Peer-to-Peer) 2011 ( ) 2018 2019 VR 2021.9 & VR 2022.3 2023 AI VR&RPG 2023.5 “Don’t Be So Serious” VOXEL 2023.7 DAZE 2023 → ( ) — 4 Ethereum III — 2023-09-13 – p.3/28
4. web3 4 web3 NFT (Non-Fungible Token) DAO (Decentralized Autonomous Organization) — 4 Ethereum III — 2023-09-13 – p.4/28
5. 1. NFT DAO 2. : NFT 3. : DAO 4. — 4 Ethereum III — 2023-09-13 – p.5/28
6. NFT DAO DeFi ( ) — 4 Ethereum III — 2023-09-13 – p.6/28
7. ( ) = = : . . . ( : ) ( ) . . . . . . . . . . . . — 4 Ethereum III — 2023-09-13 – p.7/28
8. ⇒ ( ) . . . . . . — 4 Ethereum III — 2023-09-13 – p.8/28
9. DeFi ( ) DeFi : Decentralized Finace . . . ( ) DeFi DAO — 4 Ethereum III — 2023-09-13 – p.9/28
10. NFT ( ) NFT : Non-Fungible Token ( ) (1 ) → fungible token ( ) → NFT — 4 Ethereum III — 2023-09-13 – p.10/28
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 — 2023-09-13 – p.11/28
12. ERC-721 NFT τʔΫϯ *% ൪߸ 63- ΞυϨε 63- /'5 Ұҙ Ұҙʁ Ұҙʁ Ұҙ ࣄ্࣮ Ұҙ ެ։伴ͷ μΠδΣετ ϝλσʔλ ίϯτϥΫτͱ͍͏ఆٛҬ ˞
    ͦͷίϯτϥΫτͱ͍͏ఆٛҬͷதͰ ࣮ઢ໼ҹͰࣔͨ͠ҰҙੑΛอূ͢Δʹա͗ͳ͍ ˞
    ഁઢ໼ҹͰࣔͨ͠Ұҙੑ͸ ࣮૷ɾӡ༻ͷ޻෉࣍ୈͰอূͰ͖Δ ɹ
    ྫ͑͹
    63- ʹͦΕ͕ࢦ͢Ϧιʔεͷ҉߸ֶతμΠδΣετΛؚΊΔ͜ͱ ྫ 
    *1'4 ͷར༻ ʹΑΓ ɹ
    ʮ63-
    ˠ
    σʔλʯͷҰҙੑΛอͯΔ ͦͷ৔߹Ͱ΋ʮσʔλ
    ˠ
    63-ʯͷҰҙੑ͸ແ͍ ର৅σʔλ ը૾౳ ॴ༗ऀ ϝλσʔλ 63- ର৅σʔλ 63- ൿີ伴 Ұҙ Ұҙʁ Ϣʔβ Ұҙʁ — 4 Ethereum III — 2023-09-13 – p.12/28
13. NFT NFT URL Marlinspike, M.: My first impressions of web3 (2022) Web3 . . . URL ↑ NFT → → NFT NFT ↔ NFT — 4 Ethereum III — 2023-09-13 – p.13/28
14. 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 — 2023-09-13 – p.14/28
15. : NFT — 4 Ethereum III — 2023-09-13 – p.15/28
16. 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 — 2023-09-13 – p.16/28
17. 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 — 2023-09-13 – p.17/28
18. NFT (2) NFT(?) NFT >>> collectible.ownerOf( NFT ID) # >>> collectible.ownerOf( NFT ID) # NFT Ethereum Ethereum NFT NFT Ethereum Lazy Minting (?) ( ) ( ) NFT — 4 Ethereum III — 2023-09-13 – p.18/28
19. NFT < , ID> ERC-721 OK NFT . . . ID → NFT ID NFT NFT URL . . . URL . . . →NFT — 4 Ethereum III — 2023-09-13 – p.19/28
20. NFT σʔλ " ϒϩοΫνΣʔϯ #⒩ ʜ ʜ ϒϩοΫνΣʔϯ #⒪ ʜ ʜ εϚʔτίϯτϥΫτ $⒩ εϚʔτίϯτϥΫτ $⒪ ಛఆͷετϨʔδ ˞
    Ͳ͜ʹஔ͔ΕΑ͏ͱ΋ ɹ
    ౳͍͠σʔλ͸ಉ͡΋ͷ ϒϩοΫνΣʔϯ͕ಉ͡Ͱ΋ҟͳͬͯ ͍ͯ΋ εϚʔτίϯτϥΫτ͕ҟͳ ΔΠϯελϯεͳΒఆٛҬ͸ผͱͳΔ ଟ͘ͷ৔߹ ې͡ΒΕͳ͍ ېࢭͰ͖ͳ͍ ˞
    /'5 ͕σʔλΛࢦ͢ํࣜͱσʔλΛ֨ೲ͢Δํࣜ͸ σʔλͷՄ༻ੑ͸ҟͳΔͱͯ͠΋ҰҙੑʹؔΘΔੑ࣭͸มΘΒͳ͍ ಉҰ εϚʔτίϯτϥΫτ $⒫ εϚʔτίϯτϥΫτ $⒬ /'5⒩ /'5⒪ /'5⒫ /'5⒬ /'5⒮ /'5⒭ σʔλ "  ېͣΔΑ͏ͳ ઃܭ͸ίετߴ ېࢭͰ͖ͳ͍ — 4 Ethereum III — 2023-09-13 – p.20/28
21. NFT NFT . . . NFT ( ) ↑ ID . . . — 4 Ethereum III — 2023-09-13 – p.21/28
22. 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 — 2023-09-13 – p.22/28
23. NFT : ERC-721 NFT NFT (ID) NFT → URI NFT ( NFT ) (ID) (URI) → NFT ( ) URI → ( ) → ( ) NFT NFT NFT — 4 Ethereum III — 2023-09-13 – p.23/28
24. : DAO — 4 Ethereum III — 2023-09-13 – p.24/28
25. DAO (1) ( ) (2) (3) . . . (a) ( ) (b) ( ) https://medium.com/coinmonks/beanstalk-exploit-a-simplified-post-mortem-analysis-92e6cdb17ace — 4 Ethereum III — 2023-09-13 – p.25/28
26. 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 — 2023-09-13 – p.26/28
27. — 4 Ethereum III — 2023-09-13 – p.27/28
28. — 4 Ethereum III — 2023-09-13 – p.28/28