I don't need the merit. I just want to make sure I can do it.

Address: 1CUbJvAk4xhoJK54R6Mdo7KRzA7KgtkHp9
Message: I'm odolvlobo and I approve this message.
Signature: G6LC/CsXrBEdqDwXmUOUZKcAODXcEvYEjd4XXs8DDswYUDlJmwuHD1X3uT1f3J8xtfeuDCdHFXgjjFHkB2OUFMk=

BTW, I found that Bitcoin Core 0.18 cannot sign using native segwit addresses (bc1...).