[tinybike]

I neglected to introduce the Reputation concept in the blog post. As joeykrug said, Reputation is needed to report on events, and your report is weighted by the number of Reputation tokens you have. So you can't sybil attack simply by splitting your tokens across multiple accounts, as this wouldn't amplify your reports in any way.

The other key point is that Reputation holders are not able to report on events as often as they want to. Instead, they only can report on events at fixed, pre-defined intervals. This precludes sybil attacks by simply report-spamming the network.