Matches can be verified by social organisers.
Verified matches are matches that have been played and recorded by a social organiser.
These matches are then used to calculate your MMR (Match Making Ranking) with 95% confidence.
Once your MMR has been calculated, you can play ranked matches against opponents with similar MMR to climb leaderboards.
All users are free to record the outcome of their matches. However, verifying (completed) matches is how players can contribute to their Match Making Rating (MMR). Find out how to record a match here. Why matches can be verified? Do all matches need to be verified? How to verify a match?