20220522_Flash Loan Attack (é”女ã®ãŠèŒ¶ä¼š)
1 Flash Loan Attack minaminao
ユニスワップ - Wikipedia
ユニスワップ（英: Uniswap）[1]ã¯ã€æš—å·è³‡ç”£ã®äº¤æ›ã«åˆ©ç”¨ã•ã‚Œã‚‹åˆ†æ•£åž‹é‡‘èžï¼ˆDeFi: Decentralized Finance）プãƒãƒˆã‚³ãƒ«ã€‚ ユニスワップã¨ã„ã†åå‰ã¯ã€ãƒ¦ãƒ‹ã‚¹ãƒ¯ãƒƒãƒ—プãƒãƒˆã‚³ãƒ«ã‚’開発ã—ãŸä¼æ¥Uniswap Labsã®æ—§åã§ã‚‚ã‚る。本プãƒãƒˆã‚³ãƒ«ã¯ã€ã‚¤ãƒ¼ã‚µãƒªã‚¢ãƒ ブãƒãƒƒã‚¯ãƒã‚§ãƒ¼ãƒ³ä¸Šã®æš—å·è³‡ç”£åŒå£«ã®äº¤æ›å–引をã€ã‚¹ãƒžãƒ¼ãƒˆã‚³ãƒ³ãƒˆãƒ©ã‚¯ãƒˆã‚’介ã—ã¦è‡ªå‹•ã§ä»²ä»‹ã™ã‚‹ã€‚2021å¹´12月時点ã€ãƒ¦ãƒ‹ã‚¹ãƒ¯ãƒƒãƒ—ã¯ä¸–ç•Œã§æœ€ã‚‚高ã„å–引高を誇る分散型å–引所（DEX: Decentralized Exchange）ã¨ãªã£ã¦ã„ã‚‹[2]。 æ´å²[編集] ユニスワップã¯ã€2018å¹´11月2æ—¥ã«Simens社ã®å…ƒæ©Ÿæ¢°è¨è¨ˆã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã§ã‚ã‚‹Hayden Adamsã«ã‚ˆã£ã¦ãƒãƒ¼ãƒ³ãƒã•ã‚ŒãŸã€‚開発元ã®Uniswap Labsã¯ã€ã‚¢ãƒ³ãƒ‰ãƒªãƒ¼ã‚»ãƒ³ãƒ»ãƒ›ãƒã‚¦ã‚£ãƒ¼ãƒ„ã€Union Square Venturesãªã©ã‚’å«ã‚€è¤‡æ•°ã®ãƒ™ãƒ³ãƒ
Hardhatã®ãƒãƒ¥ãƒ¼ãƒˆãƒªã‚¢ãƒ«ã‚’ã‚„ã£ã¦ã¿ãŸ - Qiita
Hardhatã¨ã¯ Ethereumソフトウェアをコンパイルã€ãƒ‡ãƒ—ãƒã‚¤ã€ãƒ†ã‚¹ãƒˆã€ãŠã‚ˆã³ãƒ‡ãƒãƒƒã‚°ã™ã‚‹ãŸã‚ã®é–‹ç™ºç’°å¢ƒ å…¬å¼ï¼šhttps://hardhat.org/ ãƒãƒ¥ãƒ¼ãƒˆãƒªã‚¢ãƒ«ï¼šhttps://hardhat.org/tutorial/ 特徴 ãƒãƒ¼ã‚«ãƒ«ã§Solidityã®ãƒ†ã‚¹ãƒˆã‚„デãƒãƒƒã‚°ãŒå¯èƒ½ ãƒãƒ¼ã‚«ãƒ«ã‚¤ãƒ¼ã‚µãƒªã‚¢ãƒ ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ï¼ˆHardhat Network）ã«ã‚³ãƒ³ãƒˆãƒ©ã‚¯ãƒˆã‚’ç°¡å˜ã«ãƒ‡ãƒ—ãƒã‚¤ã§ãã€ãƒˆãƒ©ãƒ³ã‚¶ã‚¯ã‚·ãƒ§ãƒ³ã®å¤±æ•—ã‚„ã€Solidityã®ã‚¨ãƒ©ãƒ¼ã€console.logã€ãŠã‚ˆã³æ˜Žç¤ºçš„ãªã‚¨ãƒ©ãƒ¼ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã‚’表示・確èªã§ãã‚‹ プラグインã§æ©Ÿèƒ½ã‚’æ‹¡å¼µã§ãる（公å¼ã‚„コミュニティーã®ã‚‚ã®ä»¥å¤–ã«è‡ªä½œã‚‚å¯èƒ½ï¼‰ TypeScriptをサãƒãƒ¼ãƒˆã—ã¦ã„る（ã“ã®ãƒãƒ¥ãƒ¼ãƒˆãƒªã‚¢ãƒ«ã§ã¯ä½¿ç”¨ã—ã¾ã›ã‚“） プãƒã‚¸ã‚§ã‚¯ãƒˆã®è¨å®š ※nodeã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã¯>=12.0をインストールã—ã¦ãŠã 1. プãƒã‚¸ã‚§ã‚¯ãƒˆã®ãƒ‡ã‚£ãƒ¬ã‚¯ãƒˆãƒªãƒ¼ã‚’作æˆã—
ERC20, ERC721, ERC725トークンã¨ã¯ï¼Ÿãã‚‚ãもトークンã£ã¦ï¼Ÿ(社内勉強会資料)
ERC20, ERC721, ERC725トークンã¨ã¯ï¼Ÿãã‚‚ãもトークンã£ã¦ï¼Ÿ(社内勉強会資料) 2020.02.05 社内勉強会 ã¯ã˜ã‚ã« ã“ã®è¨˜äº‹ã¯æ ªå¼ä¼šç¤¾digglueã®æ–°å’ã‚’å«ã‚€ç¤¾å“¡å‘ã‘ã®å‹‰å¼·ä¼šã§åˆ©ç”¨ã—ãŸå†…容ã§ã™ã€‚今回ã®ãƒ†ãƒ¼ãƒžã¯Tokenã«ã¤ã„ã¦ã€‚内容や表ç¾ã®é–“é•ã„ãªã©ãŒã‚ã‚‹ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“ãŒã”了承ãã ã•ã„。 å°Žå…¥ ERCトークンをç†è§£ã—よã†ã¨æ€ã†ã¨ã€ERC20, ER721ãªã©ãªã©æ§˜ã€…ãªãƒˆãƒ¼ã‚¯ãƒ³è¦æ ¼ãŒã‚ã‚Šã‹ã¤é–‹ç™ºã®ã‚¹ãƒ”ードã¯ç›®è¦šã¾ã—ã„状態ã§ã€å…¨ä½“を把æ¡ã™ã‚‹ã®ãŒé›£ã—ã„ã¨æ„Ÿã˜ã‚‹ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“。 ã—ã‹ã—ã€ãƒˆãƒ¼ã‚¯ãƒ³ã‚’ç†è§£ã™ã‚‹ä¸Šã§å¤§äº‹ãªã“ã¨ã¯ãã‚Œãžã‚Œã®è¦æ ¼ã®è©³ç´°ã‚’追ã†äº‹ã§ã¯ãªãã€ãã‚‚ãもトークンã¨ã¯ä½•ã‹ã¨ã„ã†ã“ã¨ã‚’ç†è§£ã—目的を把æ¡ã™ã‚‹ã“ã¨ã§ã™ã€‚ 今回ã¯ãã‚Œãžã‚Œã®ç´°ã‹ã„差異ã«è§¦ã‚Œã‚‹ã®ã§ã¯ãªãã€ãã‚‚ãもトークンã¨ã¯ä½•ã‹ã¨ã„ã†äº‹ã®æ•´ç†ã‹ã‚‰åˆã‚ã¦ã€ERCトークンã®å¤§ããªé¡žåž‹ã¨è€ƒãˆæ–¹ã‚’把æ¡ã—ã¦ã„ãã¾ã™
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Dapps ã‚’ Truffle + Ganache ã‹ã‚‰ Hardhat ã«ç§»è¡Œã—ã¦ã¿ãŸ
ã“ã‚“ã«ã¡ã¯ãƒŸã‚¯ã‚·ã‚£ã® 開発本部 SREグループ ã® riddle ã§ã™ã€‚ 今回ã¯å…ˆæ—¥ä½œã£ãŸ TODOリスト㮠Dapps ã‚’ Hardhat を使ã£ã¦å‹•ã‹ã—ãŸã„ã¨æ€ã„ã¾ã™ã€‚(最近㯠Hardhat ãŒçµæ§‹ä½¿ã‚ã‚Œã¦ã„るよã¨æ•™ãˆã¦ã‚‚らã£ãŸ) 先日ã®ã‚„㤠→ Dapps TODO リスト ã‚’Solidity ã§ä½œã£ã¦ã¿ãŸä»Šå›žã®ã‚³ãƒ¼ãƒ‰ã¯ã“ã¡ã‚‰ → lirlia/solidity-hardhat-todo目次◆ Hardhat ã¨ã¯ï¼Ÿ â—† Hardhat ã«ç§»è¡Œã—ã¦ã¿ã‚‹ â—† MetaMask ã®æº–å‚™ â—† フãƒãƒ³ãƒˆã‚¨ãƒ³ãƒ‰ã®æº–å‚™ â—† å‹•ã‹ã—ã¦ã¿ã‚‹ â—† ã¾ã¨ã‚ Hardhat ã¨ã¯ï¼ŸHardhat㯠Ethereum ソフトウェアをコンパイルã€ãƒ‡ãƒ—ãƒã‚¤ã€ãƒ†ã‚¹ãƒˆã€ãŠã‚ˆã³ãƒ‡ãƒãƒƒã‚°ã™ã‚‹ãŸã‚ã®é–‹ç™ºç’°å¢ƒã§ã™ã€‚ Truffle ã¨ç•°ãªã‚Š Hardhat 自体㌠Ethereum 互æ›ã®ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯(ãƒãƒ¼ã‚«ãƒ«ã‚¤ãƒ¼ã‚µãƒªã‚¢
Hardhat's tutorial for beginners | Ethereum development environment for professionals by Nomic Foundation
#Hardhat's tutorial for beginners Welcome to our beginners guide to Ethereum contracts and dApp development. This tutorial aims to quickly get you set up to build something from scratch. To orchestrate this process we're going to use Hardhat, a development environment that facilitates building on Ethereum. It helps developers manage and automate the recurring tasks that are inherent to the process
Hardhat | Ethereum development environment for professionals by Nomic Foundation
Hardhat Runner is the main component you interact with when using Hardhat. It's a flexible and extensible task runner that helps you manage and automate the recurring tasks inherent to developing smart contracts and dApps. Learn more Run Solidity locallyEasily deploy your contracts, run tests and debug Solidity code without dealing with live environments. Hardhat Network is a local Ethereum networ
GitHub - ethereum/EIPs: The Ethereum Improvement Proposal repository
ATTENTION: The EIPs repository has recently undergone a separation of ERCs and EIPs. ERCs are now accessible at https://github.com/ethereum/ercs. All new ERCs and updates to existing ones must be directed at this new repository. The editors apologize for this inconvenience. The goal of the EIP project is to standardize and provide high-quality documentation for Ethereum itself and conventions buil
ERC20Permitã«ã¤ã„ã¦
1. Overview ガイドã®ã‚¿ãƒ¼ã‚²ãƒƒãƒˆ ERC20ã®Permit関数ã¨ã¯ä½•ã‹ã€ä½¿ã†ã“ã¨ã®ãƒ¡ãƒªãƒƒãƒˆ Permit関数ã®ã‚³ãƒ¼ãƒ‰è§£èª¬ EIP-712ã«ã¤ã„㦠必è¦ãªçŸ¥è˜ Solidityã®ç°¡å˜ãªæ–‡æ³• ECDSA(楕円曲線暗å·) トランザクションã®ç½²åã¨æ‰¿èªã®æµã‚Œ 2. ERC20ã®Permit関数ã¨ã¯ä½•ã‹ã€ä½¿ã†ã“ã¨ã®ãƒ¡ãƒªãƒƒãƒˆ Open Zepplein｜docs ã“ã¡ã‚‰ã®å…¬å¼ãƒ‰ã‚ュメントã«ã“ã®é–¢æ•°ã«ã¤ã„ã¦èª¬æ˜ŽãŒã‚ã‚Šã¾ã™ã€‚permit関数ã¯EIP-2612（Ethereum Improvement Proposals）ã§æ案ã•ã‚ŒãŸè‰æ¡ˆçŠ¶æ…‹ã®æ©Ÿèƒ½ã§ã™ã€‚ ç°¡å˜ã«èª¬æ˜Žã™ã‚‹ã¨ã€ERC20ã®ãƒˆãƒ¼ã‚¯ãƒ³ã‚’é€ä¿¡ã™ã‚‹ã«ã¯é€šå¸¸ã€transferFrom関数を呼ã³å‡ºã™å‰ã«ãƒˆãƒ©ãƒ³ã‚¶ã‚¯ã‚·ãƒ§ãƒ³ã§approve関数を呼ã³å‡ºã™å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚ã—ã‹ã—ã€ã“ã®permit関数を用ã„ã‚Œã°ã€ãƒˆãƒ©ãƒ³ã‚¶ã‚¯ã‚·ãƒ§ãƒ³ã§ã¯ãªãアカウントã®ç§˜å¯†éµã§
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ç¾åœ¨ã€Blockchainã®æ´»ç”¨é ˜åŸŸã¯Satoshi NakamotoãŒè«–文（Bitcoin: A Peer-to-Peer Electronic Cash System）ã§å”±ãˆãŸBitcoinã«ä»£è¡¨ã•ã‚Œã‚‹ä¾¡å€¤ã®ä¿ç®¡ãƒ»ç§»è»¢ã®åŸŸã‚’超ãˆã€Ethereumã®ã‚ˆã†ãªã‚¢ãƒ—リケーションプラットフォームã®é ˜åŸŸã¾ã§å¹…広ã検討ã•ã‚Œã¦ã„ã¾ã™ã€‚ä¸ã§ã‚‚Ethereum上ã§ã¯ã€ã™ã§ã«1,000を超ãˆã‚‹ã‚¢ãƒ—リケーションãŒå˜åœ¨ã—ã€Token・Identity・Subscriptionãªã©æ§˜ã€…ãªç”¨é€”ã§æ´»ç”¨ãŒãªã•ã‚Œã¦ã„ã¾ã™ã€‚ã“ã‚Œã¯åŒæ™‚ã«ã‚¢ãƒ—リケーションを展開ã™ã‚‹ã‚µãƒ¼ãƒ“スレイヤー（wallet・Exchange・Game）ã¨ã®é–“ã§ä»•æ§˜ã®äº’æ›æ€§ãŒæ±‚ã‚られã€ã“ã†ã—ãŸä»•æ§˜ã«é–¢ã™ã‚‹æ”¹å–„æ案ã®å ´ã¨ã—ã¦Ethereumã§ã¯EIP/ERCãŒè¨ã‘られã¦ã„ã¾ã™ã€‚ãã“ã§ä»Šå›žã€ã‚¢ãƒ—リケーションプラットフォームã¨ã—ã¦ä»Šå¾Œã‚‚活用ãŒäºˆæƒ³ã•ã‚Œã‚‹Ether
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