Sorry, that wasn't as good of a reference as I thought. Somewhere in the presentation for the paper, the authors mention that they worked with the bitcoin clien

Sorry, that wasn't as good of a reference as I thought. Somewhere in the presentation for the paper, the authors mention that they worked with the bitcoin client devs (after publication) to get the notify neighbors on double-spend approach rather than silently ignoring. The result is that the information spreads through the p2p network very quickly and notifies both recipients that they are getting shafted.