Chapter 12

1. Always use the latest version of the Truffle framework. The new Truffle framework has new tools and bug fixes available. Also, for OpenZeppelin, make sure that you check the bug fixes present in the library files. If you are using library files from old versions of OpenZeppelin, make sure that there are no issues found in the library after the version you are using; otherwise, it is recommended that you use the latest version of OpenZeppelin.
2. Truffle reads the mnemonics seed phrase from the .secret file when using the HD wallet provider. Ensure that the file is kept on a secure machine and that only authorized people have access to that machine. If the machine is compromised, the .secret file could be leaked to attackers.
3. Always perform the tests on a local blockchain environment first, such as Ganache. Then, you can perform the tests on testnets (such as...