-----BEGIN BITCOIN SIGNED MESSAGE-----
Date: 25/03/2018, Sunday. My bitcointalk profile:
https://bitcointalk.org/index.php?action=profile;u=868760Sunday. I'm ManagerVita, own this address.
-----BEGIN SIGNATURE-----
3GMfvcUCRrXF6HYFq87b2KoM4zSN8eN5Fd
JC4Zj5Dnht7YjYCOCOsblD0bu9/RN1yT6E7Lmbk0Vtc1CvvrwJLLkL5U+UqZ8RcxtkDFXaeyqCy5OXTYWjvQw+s=
-----END BITCOIN SIGNED MESSAGE-----
I tried with brainwalletx and Electrum but both failed to verify. Try signing new signature without new line. Line break sometimes causes troubles. And verify it yourself with
if it works, it should work for me as well.