Basically, it sounds like a good techno-fix to the purely fake review problem. But I think there are some problems.

For the most part, only techno-savvy providers can do this.  

How will it work for agency girls? How will it work for apartments, massage parlors, etc where the girls basically have nothing to do with the business side or where the girls don't have a good command of English language instructions. I can see it being a real PITA for phone girls and mamasans at the AMPs.  

How will it work for short notice appointments (once again, AMPs, brothels, apartments)?  

Unused codes should not be problem.  The last I checked, there are bazillions of number-letter codes.
There are plenty of legit cancellations with plenty of notice so an unused code just gets flushed.  Time limit: I think the TER time limit for a review is 3 months after the meeting. A Confirmed review does have to have the same time limit but 90 days is the upper limit for any review.

As you said, the code does have to be obtained BEFORE a meeting, otherwise, the provider will simply not request a code if she thinks the guy was disappointed during the session. But when will she give the guy the code? Before the session or after the session? Once again: bad session, "I lost the code. Sorry."

I think Confirmeds could be a plus but I don't think that Unconfirmeds should be counted against most girls until many other issues are worked out for them.

I don't think that Unconfirmeds should NOT count towards VIP, especially if critical of the experience.  Too many Confirmed negative reviews and a reviewer will be a confirmed "do not see".  

 
If you were Amazon, you'd file for a patent on this idea.

fake and revenge reviews is a huge plus in my book. While providers advertising in all sorts of venues are reviewed on TER, the vast majority of providers who advertise here are independent, and I think it would work VERY well for us. I'm willing to put in the 20 minutes of tech-learning-curve time it would take to figure out a function like this! Thank you, Dave!

There are probably more fake good reviews than there are bad. Some the providers may want, and some they don't want. They might deliver the exact experience described in a fake positive review(FPR) the review itself is still fake.  

I don't think your solution would solve that issue, since the provider would already be aware of the FPR, because she more than likely requested it. I think what you are suggesting would discourage real honest reviews.

How would you review new providers, and non TER providers, etc.

1. Eliminate free VIP for merely writing reviews -
         If we must give free VIP, then let's create a "Rep" system based upon more than writing reviews.
         Many sites have "Rep" ratings and such a system could easily be equated to a few VIP days.
         Reviews could be a factor, along with length of membership, # posts, "likes", etc....

2. Eliminate "Top" lists -  
         An easy search finds top providers. The lists encourage fake reviews at the top AND bottom scores.

Any system can be "gamed". The more complex it is, the more ways in which this can be accomplished. IMHO, it is better to keep it as simple as possible.

Positive reviews need to have this so we can decide if the reviewer has a conflict on interest.

Is how many providers are aware of much less use TER? For those that aren't aware of the site they would be put at a huge disadvantage. All of their reviews would unconfirmed. Following your logic the average guy would stay away from them because the reviews would be suspect.

Just for laughs I went back a few weeks, to avoid the holiday, to count how many providers post their photo in the photo thread. I see a lot of 50-60 a day. Lets just say the active providers here are 100 times that or 5,000 to 6,000 providers. It is estimated in the Chicago area alone there are 16,000 active providers of all type. Take that across the country, although I think my estimate of the providers here is very high, and this would impact only a tiny % of providers. It would hurt the vast majority of providers.

This would mean you have two castes of providers. The techno savy ones, that are aware of TER, would trumpet the fact they are TER confirmed and charge more. The ones that aren't or are unaware of the site will be penalized for something they don't even know about.

I noticed that you left fake positive reviews out of your concern. Those are the easiest to write and are probably by far the majority of questionable reviews. As I noted above nothing about this system would prevent a provider from offering inducements, BBFS, extra time etc for a good review. If they are a confirmed provider it would be assumed that induced review is accurate.

Just a personal thought but I have no interest in leaving these extra digital finger prints if I am going to participate in a felony or misdemeanor.

If you use TER regularly, you become familiar with other established reviewers who see and review the same type provider that you desire, then just simply give their reviews more credence.  Also, I also check to see how many reviews a reviewer has posted (and discou those with fewer than 10) and in particular if they include providers I have seen.  If those are consistent with my experience,nthen i give them more weight.   I ignore the outlyers, and often with new providers the first review often seems to be a very positive review - which I discou t as its often posted by the provider, the agency, or a friend seeking to give their business a boost.