Contact the one who left it (shorena) about it.
It would be best to sign once again a message, just to be sure.
Hello Lutpin, you're right, I was thinking about that too, here we go :
-----BEGIN DIGIBYTE SIGNED MESSAGE-----
Hello from the owner of "onepix" bitcointalk account.
By signed with the same private key as "onepix1" I prove that I'm the same person.
I also put my btc address here even if I'll "stake it" into the appropriate topic
1QKo4VhSXWZ1sG3Ad3NccyWXSmMSdRWpk5
-----BEGIN SIGNATURE-----
DSm1DEcFhBst59uBqVg3vhKEC61Y8YQovG
IDcSiJHXKixaXdiDQ4VMbfCOpopGvs2IPwFX3OrqHoSrxIBUNNXVBCN5J/I/UX1RC88tKKzw3B2oRiAowCsM5BY=
-----END DIGIBYTE SIGNED MESSAGE-----
In this way it's more clear I suppose