Ben Rubin, cocreator of hit pandemic chat app Houseparty, has launched a new group messaging platform that aims to solve the problems undermining trust in public conversation—using blockchain. If it fails, that’s OK by him.Ben Rubin, cocreator of hit pandemic chat app Houseparty, has launched a new group messaging platform that aims to solve the problems undermining trust in public conversation—using blockchain. If it fails, that’s OK by him.