-----BEGIN BITCOIN SIGNED MESSAGE-----
Today is 10.06.2018 and I am Lucius from bitcointalk.org
-----BEGIN BITCOIN SIGNATURE-----
Address: 19ftAppstSAkTnutT43hsWvDqRGssBb8So
H7LE3Z0xfj+4ypMPfvRKbTdzLELOYPxhfe4SOGZ114HQRyfqUolIOo8mn/3MrGuF78agJfXusBzH6OOqGs/nbWo=
-----END BITCOIN SIGNATURE-----
First time sign here :
https://bitcointalk.org/index.php?topic=996318.msg13662864;topicseen#msg13662864Address: 19ftAppstSAkTnutT43hsWvDqRGssBb8So
Message: This is Lucius from bitcointalk.org on January 24. 2016.
Signature: IHoXLe2jr8be4BJsgh06j+Xw0ZdMC7Cu3oKAVTfPCe6vSabnUVclNBwOmDZhOBP2anpSXEpkEO47NP9s5+VPyMg=
I need to go backwards to find this address because I changed it few times, but I keep all private keys just in case I need them one day. It take few months after registration to even notice that sign address is important to prove the ownership over the forum account.