Code:
-----BEGIN BITCOIN SIGNED MESSAGE-----
06-20-2020. I am Charles-Tim from bitcointalk forum. My primary bitcoin address for reference: 3HkmxFukfkRkTV6BR7xRSNxGjyM38qcnaJ
-----BEGIN SIGNATURE-----
3HkmxFukfkRkTV6BR7xRSNxGjyM38qcnaJ
H81r6kuKPM+VX/8MrXAbpXOWNTGPvQlpyM339XH0BPxQJbsftiVRO1O0GLDnVtd5pzpJaZKuy4yg+fB1Zh8ZMrU=
-----END BITCOIN SIGNED MESSAGE-----
I have failed to verify it using both Brainwalletx