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

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

2022年4月27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
PRO

April 27, 2022
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  1. 4 BBc-1 Ethereum III CSO / ks91@blockchainhub.co.jp — 4 BBc-1

    Ethereum III — 2022-04-27 – p.1/26
  2. https://speakerdeck.com/ks91 — 4 BBc-1 Ethereum III — 2022-04-27 – p.2/26

  3. ( ) SFC ( ) CSO (Chief Science Officer) 1993

    ( ) 2006 ( ) SFC 21 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) ) → ( ) — 4 BBc-1 Ethereum III — 2022-04-27 – p.3/26
  4. BBc-1 Ethereum 4 NFT DAO — 4 BBc-1 Ethereum III

    — 2022-04-27 – p.4/26
  5. 1. NFT DAO 2. : NFT 3. : DAO 4.

    — 4 BBc-1 Ethereum III — 2022-04-27 – p.5/26
  6. NFT DAO DeFi ( ) — 4 BBc-1 Ethereum III

    — 2022-04-27 – p.6/26
  7. ( ) = = : . . . ( :

    ) ( ) . . . . . . . . . . . . — 4 BBc-1 Ethereum III — 2022-04-27 – p.7/26
  8. ⇒ ( ) . . . . . . —

    4 BBc-1 Ethereum III — 2022-04-27 – p.8/26
  9. DeFi ( ) DeFi : Decentralized Finace — 4 BBc-1

    Ethereum III — 2022-04-27 – p.9/26
  10. NFT ( ) NFT : Non-Fungible Token ( ) (1

    ) → fungible token ( ) → NFT — 4 BBc-1 Ethereum III — 2022-04-27 – p.10/26
  11. 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 — 2022-04-27 – p.11/26
  12. NFT NFT URL Marlinspike, M.: My first impressions of web3

    (2022) Web3 . . . URL ↑ NFT → → NFT NFT ↔ NFT — 4 BBc-1 Ethereum III — 2022-04-27 – 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 BBc-1 Ethereum III — 2022-04-27 – p.13/26
  14. : NFT — 4 BBc-1 Ethereum III — 2022-04-27 –

    p.14/26
  15. NFT Linux (Ubuntu 20.04.4) Python3 + eth-brownie 1.18.1 (Python Ethereum

    ) $ brownie bake nft nft ( ) contracts SimpleCollectible.sol ERC-721 — 4 BBc-1 Ethereum III — 2022-04-27 – 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 BBc-1 Ethereum III — 2022-04-27 – 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 BBc-1 Ethereum III — 2022-04-27 – p.17/26
  18. NFT < , ID> ERC-721 OK NFT . . .

    ID → NFT ID NFT NFT URL . . . URL . . . →NFT — 4 BBc-1 Ethereum III — 2022-04-27 – p.18/26
  19. NFT NFT . . . NFT ( ) ↑ ID

    . . . — 4 BBc-1 Ethereum III — 2022-04-27 – p.19/26
  20. NFT NFT >>> network.disconnect() # >>> network.connect(’ropsten’) # Ethereum >>>

    accounts.add( ) # >>> collectible = SimpleCollectible.deploy({’from’: accounts[0]}) # NFT >>> collectible.createCollectible( ) # NFT ropsten / ( ) “Gas used” Gas Gwei ERC-721a ID 1 — 4 BBc-1 Ethereum III — 2022-04-27 – p.20/26
  21. NFT : ERC-721 NFT NFT (ID) NFT → URI NFT

    (ID) URI → NFT ( ) URI → ( ) → ( ) NFT NFT NFT — 4 BBc-1 Ethereum III — 2022-04-27 – p.21/26
  22. : DAO — 4 BBc-1 Ethereum III — 2022-04-27 –

    p.22/26
  23. DAO (1) ( ) (2) (3) . . . (a)

    ( ) (b) ( ) https://medium.com/@omniscia.io/beanstalk-farms-post-mortem-analysis-a0667ee0ca9d — 4 BBc-1 Ethereum III — 2022-04-27 – 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 BBc-1 Ethereum III — 2022-04-27 – p.24/26
  25. — 4 BBc-1 Ethereum III — 2022-04-27 – p.25/26

  26. — 4 BBc-1 Ethereum III — 2022-04-27 – p.26/26