Summary

In this chapter, we discussed various aspects of Solidity smart contract development, focusing on security and best practices. We covered the importance of adhering to security guidelines and highlighted common mistakes and pitfalls, such as access control, input validation, error handling, visibility, safe math, upgradability, and testing and auditing.

We took a deep dive into access controls, addressing their significance in smart contracts and the potential issues that can arise from bad access control implementations. We also explored popular smart contract hacking incidents and failures, emphasizing the need for vigilance in contract development.

Upgradable smart contracts were examined, discussing their importance and the mechanisms for upgrading them, including the proxy pattern. We also discussed multisig contracts, their functionality, and advantages and disadvantages, and provided a simple multisig contract example.

Furthermore, we delved into smart contract...