When you look at this issue, there are three competing subproblems: 1) How do I find the X server for domain Y that domain Y is running? 1A) How do I find the X server that proxies for domain Y (a subcase of 1) 2) How do I find user Z in domain Y when no server (proxy or native) is available? 3) How do I find user Z in a list of user registries? (and how do I find the definitive list of user registries?)
to users, there are only two questions: o given a pgp id, show me the key o kiven a key id, show me the key all of the 'sub-problems' above are a symptoms of trying to impose multiple servers, dns-based solutions, proxies, ... to solve a classic internet scaling problem. simply don't go there, complexity increses super-linearly with scale with these methods. randy