-----BEGIN BITCOIN SIGNED MESSAGE-----
user : atileture
user ID: 1241330
date : 07.03.2018
-----BEGIN SIGNATURE-----
SdqhuDo5cTHe2ABSbaKinoqZEKRp2zQqrU
H2CK8TwSRBJNpS3tuktlCG1BViW7tN2Ntgz0I7HsfgjYYnq20gaoxuxLK6DRmDtniIK/1OW+YCRvBDwmmXz/LTQ=
Can't verify your signature.
SdqhuDo5cTHe2ABSbaKinoqZEKRp2zQqrU is not a Bitcoin Address,
I am seeing a lot of people signing messages with Segwit Address (starting with 3 or b).
There is no standard to verify these addresses.
Electrum is somehow verifying them, but only Electrum, and it's nonstandard.
In future there will a standard for those address, to be verified in any wallet, and not necessarily the same Electrum did. In future those signed messages may not be able to be verified. I think it's better to sign with a legacy address for now.
Nope, once other wallets support bc1 addresses, they will eventually be able to verify those addies.