John Karantzis is a modern marvel, a man born devoid of shame.

It’s hard to know who is more delusional: the former boss of iSignthis (since renamed Southern Cross Payments) who spent years promising a $464 million payday from his lawsuit against the ASX for suspending his company, or his shareholders who believed him – right up to the point when the case was, entirely foreseeably, abandoned last month.