The next major line of defense is proper code auditing. This can’t merely be internal auditing done by the developers themselves. Instead, third-party services need to be employed that publish complete and transparent reports on any and all issues found within the code. These audits also need to be performed regularly, especially when changes are made to the codebase, to ensure updates don’t inadvertently introduce errors. Having this level of comprehensive review and transparency is the foundation of keeping all users safe.