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You're reading from Mastering Blockchain Programming with Solidity

Product type Book

Published in Aug 2019

Publisher Packt

ISBN-13 9781839218262

Pages 486 pages

Edition 1st Edition

Languages

Solidity

Concepts

Blockchain

Author (1):

Jitendra Chittoda

Table of Contents (21) Chapters

Preface

1. Section 1: Getting Started with Blockchain, Ethereum, and Solidity

2. Introduction to Blockchain

3. Getting Started with Solidity

4. Control Structures and Contracts

5. Section 2: Deep Dive into Development Tools

6. Learning MetaMask and Remix

7. Using Ganache and the Truffle Framework

8. Taking Advantage of Code Quality Tools

9. Section 3: Mastering ERC Standards and Libraries

10. ERC20 Token Standard

11. ERC721 Non-Fungible Token Standard

12. Deep Dive into the OpenZeppelin Library

13. Using Multisig Wallets

14. Upgradable Contracts Using ZeppelinOS

15. Building Your Own Token

16. Section 4: Design Patterns and Best Practices

17. Solidity Design Patterns

18. Tips, Tricks, and Security Best Practices

19. Assessments

20. Other Books You May Enjoy

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Chapter 13

Yes, you can write a withdrawal function to withdraw ERC20 tokens from the contract; otherwise, you would have to send ERC20 tokens from the contract to multiple addresses.
Based on your system architecture and role-based access, you can apply access restrictions to some or all of the functions present in a contract. If there is no access restriction required by your contracts, you can avoid using this pattern.

The emergency stop pattern is used in contracts to stop or pause the contract's main behavior when an unfavorable event occurs. The contract should be paused when any bug is found in the contract to stop and migrate to a new contract; however, this pattern is a problem for a truly decentralized system.
It is recommended that the creation of a new contract is performed via the factory pattern; however, if there is no specific setup required in...

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Authors (1)

Jitendra Chittoda

Jitendra Chittoda is a blockchain security engineer at ChainSecurity. His day job is to perform security audit on smart contracts and expose security vulnerabilities in Solidity and Scilla contracts. He has also developed a non-custodial, decentralized, P2P lending contracts for ETHLend. The Solidity contracts that he has developed or audited handle over $100 million worth of cryptoassets. He also served as a tech and security advisor in various ICO projects. Before finding his passion for blockchain, he coded in Java for over 11 years. He is the founder and leader of Delhi-NCR-JUG, a non-profit meetup group for Java. He holds a master's degree in computer applications and is regularly invited as a speaker at various conferences and meetups.

See other products by Jitendra Chittoda