A downloaded file is not trustworthy just because the download completed. That is why configuration hash verification matters.
The idea is straightforward: the app knows the trusted SHA-256 hash in advance, downloads the configuration file, calculates the new hash, and compares the two.
What happens if the file changes
If even one byte changes, the hash changes too. That means the app can detect modification automatically.
When the trusted hash and the downloaded file no longer match, the connection should be blocked. That is the right fail-safe behavior.
Why this matters
This protects users from altered configuration files, storage tampering, or anything else that tries to swap a trusted file for an untrusted one.
Hash verification is not glamorous, but it is one of the clearest examples of security software doing the right thing quietly.