http://planet.i2p?i2paddresshelper=W0omtMApOdlTkgJoct08QnzDkeb~xc60df5Cx3k3qqOFmyEkRB65NdpSdvldI5STmXmXlZe68f8Hu1dfBMmKvfpBFMpP-mRVYuHbEa4N1dRkp3AOswZFO51lSC~MVPMZKGHAv0cfv5WFaJ9nfuaR7iYYWJF11xotoPTMbJdB-I3XPC8rxHI-73ATlOD4cU9oZ6BYcBE0dun9zw4IHBcRpnFRx~s-TkevNfPnBqujB-NNgA8a5s~QUj0h3FwwUWsNB8f1Uwy~DwoQh7pMp6dsZ3umEyBn2HaXZasSmbzB30qkQRs9vrAtIFdIzCQ~8gI2cHdHEPgExUQX~xlM8QZEgokoexilIPG53Co1kKARN0uCSxu8uCcP0FriGejPp3vdWdopxFLi2Oph4SMwKgD~QSLb54u-ZXlvBXLrKyr1xZC~KkDv45D4z8WN4kYjSpglcQGTEURWnYEDjVmS7oIrAiI7D-60cJ0qXfV2i7AjxmWaws4a41vV9hWJuRAzhZtYBQAEAAcAAA== rel=
A Monero node running as a Tor hidden service used to slip its own onion address into the peer list of every periodic timed-sync message it sent, so any peer it talked to could fingerprint it and learn its address.