The developers of Augur, a decentralized trading and betting protocol, just released a new version of the app that promotes more liquid markets and counteracts bad actors. Augur lets people trade and create prediction markets on any outcomes in the world, from political elections and sports to future asset prices. Since Augur’s initial launch last summer, one or more bad actors have created and profited off illegitimate markets at the expense of unsuspecting traders. These markets appeared legitimate but...