I think this is ok:
Hello, I am zazarb of bitcointalk.org,
Tuesday 1 Sep 2015
-----BEGIN SIGNATURE-----
13onqzPnGzazarbReooW4sBkqEgKPoMwZV
HJCKMjUh7VPSdIgoBSfsiNhId9WoBSkGsnQ8T9RR4WNmKbxvcPXyncEuOBgcRcUY/RSJrLdwYv2ggUO9fLQcCmo=
-----END BITCOIN SIGNED MESSAGE-----
Hmm.
https://chainquery.com/bitcoin-api/verifymessage
"result": false,
"error": null,
"id": null
}
http://coinig.com/?adr=13onqzPnGzazarbReooW4sBkqEgKPoMwZV&msg=Hello%2C+I+am+zazarb+of+bitcointalk.org%2C%0D%0ATuesday+1+Sep+2015&sig=HJCKMjUh7VPSdIgoBSfsiNhId9WoBSkGsnQ8T9RR4WNmKbxvcPXyncEuOBgcRcUY%2FRSJrLdwYv2ggUO9fLQcCmo%3D