User blog comment:Sannse/Guest Blog Post - Screenshots and Chat Logs/@comment-5959745-20140628063022/@comment-452-20140629025503

If the server stored the logs, then there is no chance of tampering. edit: except by Wikia Staff...

You know when you enter the chat, and you can see the last ~10 lines so ~10 minutes of recent chat? That's stored on the server. Presumably, there's a literal ~10 line and ~10 minute limit - I haven't experimented to find the actual values.

There is no technical reason why that couldn't be increased to be stored for longer. Except disk space, which is obviously not an issue.

edit: apparently the "when you edit a blog comment twice in a row, your first edit is removed" bug was never fixed.