Not quite building off of your current system, but I've long wanted a service where I could log-in and be approved to participate
anonymously in conversations that are still somewhat moderated. "?
&%$#?#$&?", you ask.
There are a lot of sites that I participate in that allow you to rate and flag other users (e.g. HN). I actually really like this ability. But frequently I want to make many posts to such site, but I don't really want all my comments to be able to be tied together
For example, there's an HN post about BFE, Idaho and I mention that's my hometown. In another post, it's relevant to the conversation, so I mention I'm Italian. In another post it becomes clear that I have extensive professional experience in underwater basket weaving. Put these three facts together and they can quickly undermine any anonymity (i.e. I'm the only Italian born in BFE, Idaho that has a career in underwater basket weaving).
So having a log-on system that allows me to be held accountable (i.e. If I make a comment on HN that gets downvoted, my HN rating still goes down) but where I can still be anonymous (i.e. no one can aggregate my comments). From a service perspective, I'm thinking of something like a Disqus plug-in architecture where I could log-in to the primary service, and only that service would ever know that I'm a singular entity. That service would provide an api that other sites could use set and grab general reputation data.
For example, I log into Service as 'yaddayadda'. I navigate to HN, and log-in. The Service reports to HN that I'm an authorized user currently known as 2051013165142 (new, random user id each time I visit HN). HN polls the Service API for my current user id. The Service reports back that my identity has earned a total of X HN submission up votes, Y HN comment up votes, and Z HN downvotes. HN can then do what it does to calculate my reputation. When I subsequently make a submission or comment and am rated, HN reports those points back to the Service, which aggregates them into 'yaddayadda's' HN totals.