The rules do state the earliest posted score is the winner of ties. There is no countback in brackets.
I've been told I'm wrong about tie-breakers. I do remember posting a score last week, and once finished, seeing that my opponent had posted the same score. I took that as a loss, until I advanced.
I record every bracket I am in, I record my score, whether my opp. has played, and I do this several times until the bracket is finished. If I'm on, I'll record the final countdown, too.
Ever since the other bracket glitch/bug, the brackets have worked fine, for me anyway. I'll see in a little over an hour if the tie goes to first posted scorecard or not. I played the bracket as soon as it opened. When I completed the round, there was 23 hours 31 minutes remaining. My opponent in this particular final had not posted a score as of 5 hours remaining, but now has, and we both have 28's. It ends in about 1 hour from now.
Luckily for me, I have only one remaining bracket final to watch, and then I'm gone from the bracket set until I can play and no have to monitor it so closely.
The solution to this monitoring, would be for premium brackets to show "past results" just as RG's show. That cannot be too difficult.
The only way to check it now, is to find it in your score history, and your opponents history and compare.