O slideshow foi denunciado.
Utilizamos seu perfil e dados de atividades no LinkedIn para personalizar e exibir anúncios mais relevantes. Altere suas preferências de anúncios quando desejar.

Multi-Signature Crypto-Wallets: Nakov at Blockchain Berlin 2018

220 visualizações

Publicada em

Multi-Signature Crypto-Wallets: Nakov at Blockchain Berlin 2018

Speaker: Dr. Svetlin Nakov (co-founder of SoftUni)

Multisig Wallets. Sign / Execute Transactions. Implementation in Bitcoin and Ethereum

Single-User-Managed Wallets: Problems
Multi-Signature Wallets: Concepts
Multi-Signature Wallets in Bitcoin
Multi-Signature Wallets in Ethereum
The Gnosis Multisig Wallet: Demo

Slides, demos and videos: https://nakov.com/blog/2018/09/26/speaker-at-the-blockchain-technology-conference-2018-berlin/

Publicada em: Educação
  • Seja o primeiro a comentar

  • Seja a primeira pessoa a gostar disto

Multi-Signature Crypto-Wallets: Nakov at Blockchain Berlin 2018

  1. 1. Multi-Signature Wallets Multisig Wallets. Sign / Execute Transactions. Implementation in Bitcoin and Ethereum Software University (SoftUni) https://softuni.org Svetlin Nakov Blockchain Engineer and Technical Trainer
  2. 2. 2  Software engineer, trainer, entrepreneur, PhD, author of 15 books, blockchain expert  3 successful tech educational initiatives (100,000+ students): About Svetlin Nakov
  3. 3. 3  Technical advisor @ LockChain / LockTrip: https://locktrip.com  Raised ~ 10.000 ETH in token sale (Sep-Nov 2017)  Currently LOC token holders book hotels @ 20-30% better price  Head of blockchain education (Jan-June 2018) @ Academy School of Blockchain: https://academytoken.com  Raised ~ 48M USD in token sale (Jan-Apr 2018)  Tech advisor for blockchain crypto startups:  Tokenize Exchange, Bountie, Weidex, IRIS Payments Solutions, Aeternity Ventures, FFQuest Nakov – Blockchain & Crypto Projects
  4. 4. 4 Book "Practical Cryptography for Developers" GitHub: https://github.com /nakov/practical- cryptography-for- developers-book Official site: https://cryptobook. nakov.com
  5. 5. Table of Contents 5 1. Single-User-Managed Wallets: Problems 2. Multi-Signature Wallets: Concepts 3. Multi-Signature Wallets in Bitcoin 4. Multi-Signature Wallets in Ethereum 5. The Gnosis Multisig Wallet: Demo
  6. 6. 6  Scenario: managing a significant amount of crypto assets:  E.g. the funds collected during an ICO  Problems with single-user-managed wallets:  Lost key / lost password / lost PIN / lost mnemonic phrase  Stolen / compromised / hacked key  Illegal activities / intentional fraud  Accident with the wallet owner Single-User-Managed Wallets: Problems
  7. 7. 7  A private key can be split into shares  E.g. using the Shamir's Secret Sharing Scheme / Lagrange interpolation polynomial  Sample split scheme:  2-of-3 (any 2 shares out of 3)  3-of-5 (any 3 shares out of 5)  Demo: bitaddress.org Split the Private Key
  8. 8. 8  A multi-signature wallet / multi-signature address  Holds assets, spendable by N-of-M signatures  E.g. 2-of-3 means "at least 2 signatures out of 3 owners"  Creating a multisig wallet  Specify the owners (public keys / addresses) and threshold  Submit new transaction for multi-signing  Sign (confirm) existing transaction (new or partially signed)  Execute transaction (when enough signatures are collected) Multi-Signature Wallets: Concepts
  9. 9. 9  A Bitcoin multisig address is created by 3 public keys  Create tx  sign  signed tx  sign  …  broadcast Multi-Signature Addresses in Bitcoin
  10. 10. 10  In Ethereum a multi-signature wallet can be implemented as Solidity smart contract  Example: the Gnosis multisig wallet contract  https://github.com/gnosis/MultiSigWallet/blob/master/contracts/ MultiSigWallet.sol  Used by Gnosis, Aragon, Bancor, Golem and many others  Golem: 0x7da82c7ab4771ff031b66538d2fb9b0b047f6cf9  Aragon: 0xcafe1a77e84698c83ca8931f54a755176ef75f2c Multi-Signature Wallets in Ethereum
  11. 11. 11  Create new wallet  Submit a transaction to the wallet and sign it  Confirm (co-sign) existing transaction in the wallet  Execute existing transaction (after the signatures are collected) The Gnosis Multisig Wallet Contract function MultiSigWallet(address[] owners, uint threshold) function submitTransaction(address dest, uint val, bytes data) function confirmTransaction(uint transactionId) function executeTransaction(uint transactionId)
  12. 12. 12 The Gnosis Multisig Wallet: Demo
  13. 13. ? Multi-Signature Crypto Wallets https://softuni.org
  14. 14. License  This course (slides, examples, demos, videos, homework, etc.) is licensed under the "Creative Commons Attribution- NonCommercial-ShareAlike 4.0 International" license 14
  15. 15. Trainings @ Software University (SoftUni)  Software University – High-Quality Education, Profession and Job for Software Developers  softuni.org  Software University Foundation  softuni.foundation  Software University @ Facebook  facebook.com/SoftwareUniversity  Software University Forums  forum.softuni.bg

×