I have now received the funds from BitMixer.Io - turns out my wallet had stopped synchronising. (My bad)
-----BEGIN SIGNATURE-----
1PYPjneN6iiXxgNEAMdcipQmR4JKcZSJ7F
H1SnZ5nxqsTVxLTkgAFus+DZp+BK17cGjzLFsmL5VGcOWlbzGOLChOfU8nfqwu2MfQhslKz1n/TPimiQhihFd5I=
-----END BITCOIN SIGNED MESSAGE-----
Quoted
Wana sign that with your old address 1AhuQTWMu185kWFmiUHhmTTVYjKR7BfirW[1] or did you post in the wrong thread?
[1] https://bitcointalksearch.org/topic/m.13627395
Why would I want to sign with the old address? 1PYPjneN6iiXxgNEAMdcipQmR4JKcZSJ7F is the wallet that was affected?