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ブロックチェーン “チョットデキル” 人々 -- ゼロから創った開発者に聞く

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Interop Tokyo 2019 (インターロップ東京 2019) @ 幕張メッセ
YB-07 2019/6/14 (Fri) 10:30 - 11:50
https://www.interop.jp/conf/YB-07.php

Published in: Software
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ブロックチェーン “チョットデキル” 人々 -- ゼロから創った開発者に聞く

  1. 1. ブロックチェーン“チョットデキル”人々 ~ゼロから創った開発者に聞く~ 竹井 悠人 東京工業大学 情報理工学院 博士課程 1 年 Interop Tokyo 2019 (インターロップ東京 2019) YB-07 2019/6/14 (Fri) 10:30 - 11:50 https://www.interop.jp/conf/YB-07.php
  2. 2. 竹井 悠人 情報処理安全確保支援士/ 宅地建物取引士/ 測量士 Microsoft MVP for Azure 株式会社 bitFlyer (2016/4 - 2019/6) ブロックチェーン開発部部長 兼 最高情報セキュリティ責任者 東京工業大学 情報理工学院 博士課程1年 (2018/9 - ) 東京大学 理学部を 2011、同大学院 情報理工学系研究科を 2013 に修了 在学中ソフトウェア エンジニアとして Google, PFN, パリ南大学でインターン 卒業後、情報処理推進機構 (IPA) による未踏事業 クリエータとして活動 複数のベンチャー創業経験。訴訟等を通じて法務知識を身につける 個人会社を通して設計・開発のコンサルティングを行う中 2016 当時に顧客だった bitFlyer に就業。2018 から研究に
  3. 3. Photo by Billy Huynh on Unsplash 事前にチェアの斉藤先生から提示されていたお題 ● 自分で開発したブロックチェーンについて ● 自分で設計したからこそ言えるブロックチェーンの肝 ● 巷に溢れる技術について言える課題
  4. 4. これまでに取り組んできたブロックチェーン 1. bitFlyer のブロックチェーン製品 miyabi C# でスクラッチから設計・開発を行った独自ブロックチェーン 2. 個人プロジェクト MinChain Bitcoin ライクな教育用ブロックチェーン 3. Azure Blockchain Service Preview Ethereum フォークの Quorum を Azure 上に展開するソリューション
  5. 5. miyabi
  6. 6. https://jp.techcrunch.com/2016/11/30/three-japanese-banks-try-blockchain/ https://www2.deloitte.com/content/dam/Deloitte/jp/Documents/about-deloitte/news-releases/jp-nr-nr20161130-report.pdf
  7. 7. MinChain https://github.com/yutopio/MinChain
  8. 8. MinChain ブロックチェーンへの理解を深める (or 確かめる) ために、 Bitcoin に類似した最低限の機能だけを備えた、オープン ソース プロジェクト ● 最低限のデータ構造 : トランザクション、ブロック ● 簡単なネットワーク接続モジュール ● ブロック実行をして、資産の移動を管理 ● マイニングをおこなう たった 2,000 行! (Bitcoind はだいたい C++ で 8 万行くらい)
  9. 9. MinChain のモジュール構成 Executor Mining KeyGenerator Config Genesis ツール群 InventoryManagerConnectionManager 解釈前のブロック保持 Memory Pool 保持 InventoryMessage 処理 Executor ブロック通知 Listener 新規接続待ち受け Peer 一覧を保持 特定ピアへの送信 ブロードキャスト Message 受信コールバック 実行済みブロック保持 UTXO の追跡 未実行ブロック一覧保持 ブロック適用/ 取消 Runner 各モジュールの 初期化 / 終了 Program エントリ ポイント コマンド振り分け
  10. 10. 日経ソフトウェア 2018/7 月号 https://bizboard.nikkeibp.co.jp/kijiken/summary/20180524/NSW0258H_4066560a.html
  11. 11. Azure Blockchain
  12. 12. ブロックチェーンの 肝と課題
  13. 13. ブロックチェーンの応用に際して 次の条件を満たすときに、最もその特長が活かされる ● 対象データの厳密な完全性が重要である いかなる場合でも改竄がいっさい許されない場合 データ構造の耐改竄性が効果を発揮 ● データに関する利害関係の調整が困難 システム運営者間での資本関係が異なる場合など 合意形成アルゴリズムで機械的な書き込みが可能
  14. 14. 技術的な課題 ● 非中央管理システムの統治 ○ 合意形成アルゴリズムの性質 ○ バージョンアップ ● ブロックチェーンの構造的課題 ○ 機密情報の取り扱い ○ 巨大なオーバーヘッド ○ 消せない問題 ● スマート コントラクト ○ プログラムのバグにまつわる問題 ○ 現実世界との対応付け Photo by Markus Spiske on Unsplash

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