try to make it clearer that eigentrust is one way to do the

   The option above has the directory servers doing all of the

   measurements. This doesn't scale. We can set it up so we have "deputy

   testers" -- trusted other nodes that do performance testing and report

   their results. If we want to be really adventurous, we could even

   their results.

   If we want to be really adventurous, we could even

   accept claims from every Tor user and build a complex weighting /

   reputation system to decide which claims are "probably" right.

   One possible way to implement the latter is something similar to

   EigenTrust [http://www.stanford.edu/~sdkamvar/papers/eigentrust.pdf],

   where the opinion of nodes with high reputation more is weighted