I was impersonated on another medium recently. Appending some sort of hash to the end of every message was my first thought as a countermeasure. (Didn't end up

I was impersonated on another medium recently. Appending some sort of hash to the end of every message was my first thought as a countermeasure. (Didn't end up implementing; easier to abandon the platform altogether and deny anything purportedly attributable to me.)