http://oi45tmbel5syg4uet4t2fg6ipfu22ewfb4dfgpeckarn3qtv3pwq.b32.i2p/tips.html
For example, if server A that you connect to is compromised, and logs containing your public key and activity are leaked, then the operator of server B, which you also connect to, can know you're the same user. Of course I don't log your public keys, or indeed anything else that your client tells my server, but what I really think you should do is give your client clear instructions on which servers to offer which public keys to.